Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull RCU updates from Ingo Molnar:
"The main changes are:
- Documentation updates, including fixes to the design-level
requirements documentation and a fixed version of the design-level
data-structure documentation. These fixes include removing
cartoons and getting rid of the html/htmlx duplication.
- Further improvements to the new-age expedited grace periods.
- Miscellaneous fixes.
- Torture-test changes, including a new rcuperf module for measuring
RCU grace-period performance and scalability, which is useful for
the expedited-grace-period changes"
* 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (56 commits)
rcutorture: Add boot-time adjustment of leaf fanout
rcutorture: Add irqs-disabled test for call_rcu()
rcutorture: Dump trace buffer upon shutdown
rcutorture: Don't rebuild identical kernel
rcutorture: Add OS-jitter capability
documentation: Add documentation for RCU's major data structures
rcutorture: Convert test duration to seconds early
torture: Kill qemu, not parent process
torture: Clarify refusal to run more than one torture test
rcutorture: Consider FROZEN hotplug notifier transitions
rcutorture: Remove redundant initialization to zero
rcuperf: Do not wake up shutdown wait queue if "shutdown" is false.
rcutorture: Add largish-system rcuperf scenario
rcutorture: Avoid RCU CPU stall warning and RT throttling
rcutorture: Add rcuperf holdoff boot parameter to reduce interference
rcutorture: Make scripts analyze rcuperf trace data, if present
rcutorture: Make rcuperf collect expedited event-trace data
rcutorture: Print measure of batching efficiency
rcutorture: Set rcuperf writer kthreads to real-time priority
rcutorture: Bind rcuperf reader/writer kthreads to CPUs
...
This commit is contained in:
Linus Torvalds
commit
a3871bd434
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id="tspan3023">(RCU Works Well)</tspan></text>
|
||||
<!-- Text -->
|
||||
<text
|
||||
xml:space="preserve"
|
||||
x="7200"
|
||||
y="3375"
|
||||
font-style="normal"
|
||||
font-weight="normal"
|
||||
font-size="324"
|
||||
id="text22"
|
||||
sodipodi:linespacing="125%"
|
||||
style="font-size:427.63009644px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:center;line-height:125%;writing-mode:lr-tb;text-anchor:middle;fill:#000000;font-family:Nimbus Sans L;-inkscape-font-specification:Nimbus Sans L"><tspan
|
||||
style="font-size:427.63009644px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:center;line-height:125%;writing-mode:lr-tb;text-anchor:middle;font-family:Nimbus Sans L;-inkscape-font-specification:Nimbus Sans L"
|
||||
id="tspan3025">Read-Mostly, Need Consistent Data</tspan></text>
|
||||
<!-- Text -->
|
||||
<text
|
||||
xml:space="preserve"
|
||||
x="7200"
|
||||
y="5175"
|
||||
font-style="normal"
|
||||
font-weight="normal"
|
||||
font-size="324"
|
||||
id="text24"
|
||||
sodipodi:linespacing="125%"
|
||||
style="font-size:427.63009644px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:center;line-height:125%;writing-mode:lr-tb;text-anchor:middle;fill:#000000;font-family:Nimbus Sans L;-inkscape-font-specification:Nimbus Sans L"><tspan
|
||||
style="font-size:427.63009644px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:center;line-height:125%;writing-mode:lr-tb;text-anchor:middle;font-family:Nimbus Sans L;-inkscape-font-specification:Nimbus Sans L"
|
||||
id="tspan3027">Read-Write, Need Consistent Data</tspan></text>
|
||||
<!-- Text -->
|
||||
<text
|
||||
xml:space="preserve"
|
||||
x="7200"
|
||||
y="6975"
|
||||
font-style="normal"
|
||||
font-weight="normal"
|
||||
font-size="324"
|
||||
id="text26"
|
||||
style="font-size:427.63009644px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:center;line-height:125%;writing-mode:lr-tb;text-anchor:middle;fill:#000000;font-family:Nimbus Sans L;-inkscape-font-specification:Nimbus Sans L"
|
||||
sodipodi:linespacing="125%">Update-Mostly, Need Consistent Data</text>
|
||||
<!-- Text -->
|
||||
<text
|
||||
xml:space="preserve"
|
||||
x="7200"
|
||||
y="5625"
|
||||
font-style="normal"
|
||||
font-weight="normal"
|
||||
font-size="324"
|
||||
id="text28"
|
||||
sodipodi:linespacing="125%"
|
||||
style="font-size:427.63009644px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:center;line-height:125%;writing-mode:lr-tb;text-anchor:middle;fill:#000000;font-family:Nimbus Sans L;-inkscape-font-specification:Nimbus Sans L"><tspan
|
||||
style="font-size:427.63009644px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:center;line-height:125%;writing-mode:lr-tb;text-anchor:middle;font-family:Nimbus Sans L;-inkscape-font-specification:Nimbus Sans L"
|
||||
id="tspan3029">(RCU Might Be OK...)</tspan></text>
|
||||
<!-- Text -->
|
||||
<text
|
||||
xml:space="preserve"
|
||||
x="7200"
|
||||
y="7875"
|
||||
font-style="normal"
|
||||
font-weight="normal"
|
||||
font-size="324"
|
||||
id="text30"
|
||||
style="font-size:427.63009644px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:center;line-height:125%;writing-mode:lr-tb;text-anchor:middle;fill:#000000;font-family:Nimbus Sans L;-inkscape-font-specification:Nimbus Sans L"
|
||||
sodipodi:linespacing="125%">(1) Provide Existence Guarantees For Update-Friendly Mechanisms</text>
|
||||
<!-- Text -->
|
||||
<text
|
||||
xml:space="preserve"
|
||||
x="7200"
|
||||
y="8325"
|
||||
font-style="normal"
|
||||
font-weight="normal"
|
||||
font-size="324"
|
||||
id="text32"
|
||||
style="font-size:427.63009644px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:center;line-height:125%;writing-mode:lr-tb;text-anchor:middle;fill:#000000;font-family:Nimbus Sans L;-inkscape-font-specification:Nimbus Sans L"
|
||||
sodipodi:linespacing="125%">(2) Provide Wait-Free Read-Side Primitives for Real-Time Use)</text>
|
||||
<!-- Text -->
|
||||
<text
|
||||
xml:space="preserve"
|
||||
x="7200"
|
||||
y="7425"
|
||||
font-style="normal"
|
||||
font-weight="normal"
|
||||
font-size="324"
|
||||
id="text34"
|
||||
style="font-size:427.63009644px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:center;line-height:125%;writing-mode:lr-tb;text-anchor:middle;fill:#000000;font-family:Nimbus Sans L;-inkscape-font-specification:Nimbus Sans L"
|
||||
sodipodi:linespacing="125%">(RCU is Very Unlikely to be the Right Tool For The Job, But it Can:</text>
|
||||
</g>
|
||||
</svg>
|
||||
|
Before Width: | Height: | Size: 10 KiB |
File diff suppressed because it is too large
Load Diff
File diff suppressed because it is too large
Load Diff
@ -1,108 +0,0 @@
|
||||
#!/bin/sh
|
||||
#
|
||||
# Usage: sh htmlqqz.sh file
|
||||
#
|
||||
# Extracts and converts quick quizzes in a proto-HTML document file.htmlx.
|
||||
# Commands, all of which must be on a line by themselves:
|
||||
#
|
||||
# "<p>@@QQ@@": Start of a quick quiz.
|
||||
# "<p>@@QQA@@": Start of a quick-quiz answer.
|
||||
# "<p>@@QQE@@": End of a quick-quiz answer, and thus of the quick quiz.
|
||||
# "<p>@@QQAL@@": Place to put quick-quiz answer list.
|
||||
#
|
||||
# Places the result in file.html.
|
||||
#
|
||||
# This program is free software; you can redistribute it and/or modify
|
||||
# it under the terms of the GNU General Public License as published by
|
||||
# the Free Software Foundation; either version 2 of the License, or
|
||||
# (at your option) any later version.
|
||||
#
|
||||
# This program is distributed in the hope that it will be useful,
|
||||
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
# GNU General Public License for more details.
|
||||
#
|
||||
# You should have received a copy of the GNU General Public License
|
||||
# along with this program; if not, you can access it online at
|
||||
# http://www.gnu.org/licenses/gpl-2.0.html.
|
||||
#
|
||||
# Copyright (c) 2013 Paul E. McKenney, IBM Corporation.
|
||||
|
||||
fn=$1
|
||||
if test ! -r $fn.htmlx
|
||||
then
|
||||
echo "Error: $fn.htmlx unreadable."
|
||||
exit 1
|
||||
fi
|
||||
|
||||
echo "<!-- DO NOT HAND EDIT. -->" > $fn.html
|
||||
echo "<!-- Instead, edit $fn.htmlx and run 'sh htmlqqz.sh $fn' -->" >> $fn.html
|
||||
awk < $fn.htmlx >> $fn.html '
|
||||
|
||||
state == "" && $1 != "<p>@@QQ@@" && $1 != "<p>@@QQAL@@" {
|
||||
print $0;
|
||||
if ($0 ~ /^<p>@@QQ/)
|
||||
print "Bad Quick Quiz command: " NR " (expected <p>@@QQ@@ or <p>@@QQAL@@)." > "/dev/stderr"
|
||||
next;
|
||||
}
|
||||
|
||||
state == "" && $1 == "<p>@@QQ@@" {
|
||||
qqn++;
|
||||
qqlineno = NR;
|
||||
haveqq = 1;
|
||||
state = "qq";
|
||||
print "<p><a name=\"Quick Quiz " qqn "\"><b>Quick Quiz " qqn "</b>:</a>"
|
||||
next;
|
||||
}
|
||||
|
||||
state == "qq" && $1 != "<p>@@QQA@@" {
|
||||
qq[qqn] = qq[qqn] $0 "\n";
|
||||
print $0
|
||||
if ($0 ~ /^<p>@@QQ/)
|
||||
print "Bad Quick Quiz command: " NR ". (expected <p>@@QQA@@)" > "/dev/stderr"
|
||||
next;
|
||||
}
|
||||
|
||||
state == "qq" && $1 == "<p>@@QQA@@" {
|
||||
state = "qqa";
|
||||
print "<br><a href=\"#qq" qqn "answer\">Answer</a>"
|
||||
next;
|
||||
}
|
||||
|
||||
state == "qqa" && $1 != "<p>@@QQE@@" {
|
||||
qqa[qqn] = qqa[qqn] $0 "\n";
|
||||
if ($0 ~ /^<p>@@QQ/)
|
||||
print "Bad Quick Quiz command: " NR " (expected <p>@@QQE@@)." > "/dev/stderr"
|
||||
next;
|
||||
}
|
||||
|
||||
state == "qqa" && $1 == "<p>@@QQE@@" {
|
||||
state = "";
|
||||
next;
|
||||
}
|
||||
|
||||
state == "" && $1 == "<p>@@QQAL@@" {
|
||||
haveqq = "";
|
||||
print "<h3><a name=\"Answers to Quick Quizzes\">"
|
||||
print "Answers to Quick Quizzes</a></h3>"
|
||||
print "";
|
||||
for (i = 1; i <= qqn; i++) {
|
||||
print "<a name=\"qq" i "answer\"></a>"
|
||||
print "<p><b>Quick Quiz " i "</b>:"
|
||||
print qq[i];
|
||||
print "";
|
||||
print "</p><p><b>Answer</b>:"
|
||||
print qqa[i];
|
||||
print "";
|
||||
print "</p><p><a href=\"#Quick%20Quiz%20" i "\"><b>Back to Quick Quiz " i "</b>.</a>"
|
||||
print "";
|
||||
}
|
||||
next;
|
||||
}
|
||||
|
||||
END {
|
||||
if (state != "")
|
||||
print "Unterminated Quick Quiz: " qqlineno "." > "/dev/stderr"
|
||||
else if (haveqq)
|
||||
print "Missing \"<p>@@QQAL@@\", no Quick Quiz." > "/dev/stderr"
|
||||
}'
|
||||
@ -237,17 +237,17 @@ o "ktl" is the low-order 16 bits (in hexadecimal) of the count of
|
||||
|
||||
The output of "cat rcu/rcu_preempt/rcuexp" looks as follows:
|
||||
|
||||
s=21872 wd0=0 wd1=0 wd2=0 wd3=5 n=0 enq=0 sc=21872
|
||||
s=21872 wd1=0 wd2=0 wd3=5 n=0 enq=0 sc=21872
|
||||
|
||||
These fields are as follows:
|
||||
|
||||
o "s" is the sequence number, with an odd number indicating that
|
||||
an expedited grace period is in progress.
|
||||
|
||||
o "wd0", "wd1", "wd2", and "wd3" are the number of times that an
|
||||
attempt to start an expedited grace period found that someone
|
||||
else had completed an expedited grace period that satisfies the
|
||||
attempted request. "Our work is done."
|
||||
o "wd1", "wd2", and "wd3" are the number of times that an attempt
|
||||
to start an expedited grace period found that someone else had
|
||||
completed an expedited grace period that satisfies the attempted
|
||||
request. "Our work is done."
|
||||
|
||||
o "n" is number of times that a concurrent CPU-hotplug operation
|
||||
forced a fallback to a normal grace period.
|
||||
|
||||
@ -681,22 +681,30 @@ Although RCU can be used in many different ways, a very common use of
|
||||
RCU is analogous to reader-writer locking. The following unified
|
||||
diff shows how closely related RCU and reader-writer locking can be.
|
||||
|
||||
@@ -5,5 +5,5 @@ struct el {
|
||||
int data;
|
||||
/* Other data fields */
|
||||
};
|
||||
-rwlock_t listmutex;
|
||||
+spinlock_t listmutex;
|
||||
struct el head;
|
||||
|
||||
@@ -13,15 +14,15 @@
|
||||
struct list_head *lp;
|
||||
struct el *p;
|
||||
|
||||
- read_lock();
|
||||
- read_lock(&listmutex);
|
||||
- list_for_each_entry(p, head, lp) {
|
||||
+ rcu_read_lock();
|
||||
+ list_for_each_entry_rcu(p, head, lp) {
|
||||
if (p->key == key) {
|
||||
*result = p->data;
|
||||
- read_unlock();
|
||||
- read_unlock(&listmutex);
|
||||
+ rcu_read_unlock();
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
- read_unlock();
|
||||
- read_unlock(&listmutex);
|
||||
+ rcu_read_unlock();
|
||||
return 0;
|
||||
}
|
||||
@ -732,7 +740,7 @@ Or, for those who prefer a side-by-side listing:
|
||||
5 int data; 5 int data;
|
||||
6 /* Other data fields */ 6 /* Other data fields */
|
||||
7 }; 7 };
|
||||
8 spinlock_t listmutex; 8 spinlock_t listmutex;
|
||||
8 rwlock_t listmutex; 8 spinlock_t listmutex;
|
||||
9 struct el head; 9 struct el head;
|
||||
|
||||
1 int search(long key, int *result) 1 int search(long key, int *result)
|
||||
@ -740,15 +748,15 @@ Or, for those who prefer a side-by-side listing:
|
||||
3 struct list_head *lp; 3 struct list_head *lp;
|
||||
4 struct el *p; 4 struct el *p;
|
||||
5 5
|
||||
6 read_lock(); 6 rcu_read_lock();
|
||||
6 read_lock(&listmutex); 6 rcu_read_lock();
|
||||
7 list_for_each_entry(p, head, lp) { 7 list_for_each_entry_rcu(p, head, lp) {
|
||||
8 if (p->key == key) { 8 if (p->key == key) {
|
||||
9 *result = p->data; 9 *result = p->data;
|
||||
10 read_unlock(); 10 rcu_read_unlock();
|
||||
10 read_unlock(&listmutex); 10 rcu_read_unlock();
|
||||
11 return 1; 11 return 1;
|
||||
12 } 12 }
|
||||
13 } 13 }
|
||||
14 read_unlock(); 14 rcu_read_unlock();
|
||||
14 read_unlock(&listmutex); 14 rcu_read_unlock();
|
||||
15 return 0; 15 return 0;
|
||||
16 } 16 }
|
||||
|
||||
|
||||
@ -3284,6 +3284,44 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
|
||||
Lazy RCU callbacks are those which RCU can
|
||||
prove do nothing more than free memory.
|
||||
|
||||
rcuperf.gp_exp= [KNL]
|
||||
Measure performance of expedited synchronous
|
||||
grace-period primitives.
|
||||
|
||||
rcuperf.holdoff= [KNL]
|
||||
Set test-start holdoff period. The purpose of
|
||||
this parameter is to delay the start of the
|
||||
test until boot completes in order to avoid
|
||||
interference.
|
||||
|
||||
rcuperf.nreaders= [KNL]
|
||||
Set number of RCU readers. The value -1 selects
|
||||
N, where N is the number of CPUs. A value
|
||||
"n" less than -1 selects N-n+1, where N is again
|
||||
the number of CPUs. For example, -2 selects N
|
||||
(the number of CPUs), -3 selects N+1, and so on.
|
||||
A value of "n" less than or equal to -N selects
|
||||
a single reader.
|
||||
|
||||
rcuperf.nwriters= [KNL]
|
||||
Set number of RCU writers. The values operate
|
||||
the same as for rcuperf.nreaders.
|
||||
N, where N is the number of CPUs
|
||||
|
||||
rcuperf.perf_runnable= [BOOT]
|
||||
Start rcuperf running at boot time.
|
||||
|
||||
rcuperf.shutdown= [KNL]
|
||||
Shut the system down after performance tests
|
||||
complete. This is useful for hands-off automated
|
||||
testing.
|
||||
|
||||
rcuperf.perf_type= [KNL]
|
||||
Specify the RCU implementation to test.
|
||||
|
||||
rcuperf.verbose= [KNL]
|
||||
Enable additional printk() statements.
|
||||
|
||||
rcutorture.cbflood_inter_holdoff= [KNL]
|
||||
Set holdoff time (jiffies) between successive
|
||||
callback-flood tests.
|
||||
|
||||
@ -508,14 +508,7 @@ int rcu_read_lock_bh_held(void);
|
||||
* CONFIG_DEBUG_LOCK_ALLOC, this assumes we are in an RCU-sched read-side
|
||||
* critical section unless it can prove otherwise.
|
||||
*/
|
||||
#ifdef CONFIG_PREEMPT_COUNT
|
||||
int rcu_read_lock_sched_held(void);
|
||||
#else /* #ifdef CONFIG_PREEMPT_COUNT */
|
||||
static inline int rcu_read_lock_sched_held(void)
|
||||
{
|
||||
return 1;
|
||||
}
|
||||
#endif /* #else #ifdef CONFIG_PREEMPT_COUNT */
|
||||
|
||||
#else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
|
||||
|
||||
@ -532,18 +525,10 @@ static inline int rcu_read_lock_bh_held(void)
|
||||
return 1;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PREEMPT_COUNT
|
||||
static inline int rcu_read_lock_sched_held(void)
|
||||
{
|
||||
return preempt_count() != 0 || irqs_disabled();
|
||||
return !preemptible();
|
||||
}
|
||||
#else /* #ifdef CONFIG_PREEMPT_COUNT */
|
||||
static inline int rcu_read_lock_sched_held(void)
|
||||
{
|
||||
return 1;
|
||||
}
|
||||
#endif /* #else #ifdef CONFIG_PREEMPT_COUNT */
|
||||
|
||||
#endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */
|
||||
|
||||
#ifdef CONFIG_PROVE_RCU
|
||||
@ -1144,4 +1129,17 @@ static inline void rcu_sysidle_force_exit(void)
|
||||
#endif /* #else #ifdef CONFIG_NO_HZ_FULL_SYSIDLE */
|
||||
|
||||
|
||||
/*
|
||||
* Dump the ftrace buffer, but only one time per callsite per boot.
|
||||
*/
|
||||
#define rcu_ftrace_dump(oops_dump_mode) \
|
||||
do { \
|
||||
static atomic_t ___rfd_beenhere = ATOMIC_INIT(0); \
|
||||
\
|
||||
if (!atomic_read(&___rfd_beenhere) && \
|
||||
!atomic_xchg(&___rfd_beenhere, 1)) \
|
||||
ftrace_dump(oops_dump_mode); \
|
||||
} while (0)
|
||||
|
||||
|
||||
#endif /* __LINUX_RCUPDATE_H */
|
||||
|
||||
@ -149,6 +149,22 @@ static inline unsigned long rcu_batches_completed_sched(void)
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Return the number of expedited grace periods completed.
|
||||
*/
|
||||
static inline unsigned long rcu_exp_batches_completed(void)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Return the number of expedited sched grace periods completed.
|
||||
*/
|
||||
static inline unsigned long rcu_exp_batches_completed_sched(void)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline void rcu_force_quiescent_state(void)
|
||||
{
|
||||
}
|
||||
|
||||
@ -87,6 +87,8 @@ unsigned long rcu_batches_started_sched(void);
|
||||
unsigned long rcu_batches_completed(void);
|
||||
unsigned long rcu_batches_completed_bh(void);
|
||||
unsigned long rcu_batches_completed_sched(void);
|
||||
unsigned long rcu_exp_batches_completed(void);
|
||||
unsigned long rcu_exp_batches_completed_sched(void);
|
||||
void show_rcu_gp_kthreads(void);
|
||||
|
||||
void rcu_force_quiescent_state(void);
|
||||
|
||||
@ -171,6 +171,77 @@ TRACE_EVENT(rcu_grace_period_init,
|
||||
__entry->grplo, __entry->grphi, __entry->qsmask)
|
||||
);
|
||||
|
||||
/*
|
||||
* Tracepoint for expedited grace-period events. Takes a string identifying
|
||||
* the RCU flavor, the expedited grace-period sequence number, and a string
|
||||
* identifying the grace-period-related event as follows:
|
||||
*
|
||||
* "snap": Captured snapshot of expedited grace period sequence number.
|
||||
* "start": Started a real expedited grace period.
|
||||
* "end": Ended a real expedited grace period.
|
||||
* "endwake": Woke piggybackers up.
|
||||
* "done": Someone else did the expedited grace period for us.
|
||||
*/
|
||||
TRACE_EVENT(rcu_exp_grace_period,
|
||||
|
||||
TP_PROTO(const char *rcuname, unsigned long gpseq, const char *gpevent),
|
||||
|
||||
TP_ARGS(rcuname, gpseq, gpevent),
|
||||
|
||||
TP_STRUCT__entry(
|
||||
__field(const char *, rcuname)
|
||||
__field(unsigned long, gpseq)
|
||||
__field(const char *, gpevent)
|
||||
),
|
||||
|
||||
TP_fast_assign(
|
||||
__entry->rcuname = rcuname;
|
||||
__entry->gpseq = gpseq;
|
||||
__entry->gpevent = gpevent;
|
||||
),
|
||||
|
||||
TP_printk("%s %lu %s",
|
||||
__entry->rcuname, __entry->gpseq, __entry->gpevent)
|
||||
);
|
||||
|
||||
/*
|
||||
* Tracepoint for expedited grace-period funnel-locking events. Takes a
|
||||
* string identifying the RCU flavor, an integer identifying the rcu_node
|
||||
* combining-tree level, another pair of integers identifying the lowest-
|
||||
* and highest-numbered CPU associated with the current rcu_node structure,
|
||||
* and a string. identifying the grace-period-related event as follows:
|
||||
*
|
||||
* "nxtlvl": Advance to next level of rcu_node funnel
|
||||
* "wait": Wait for someone else to do expedited GP
|
||||
*/
|
||||
TRACE_EVENT(rcu_exp_funnel_lock,
|
||||
|
||||
TP_PROTO(const char *rcuname, u8 level, int grplo, int grphi,
|
||||
const char *gpevent),
|
||||
|
||||
TP_ARGS(rcuname, level, grplo, grphi, gpevent),
|
||||
|
||||
TP_STRUCT__entry(
|
||||
__field(const char *, rcuname)
|
||||
__field(u8, level)
|
||||
__field(int, grplo)
|
||||
__field(int, grphi)
|
||||
__field(const char *, gpevent)
|
||||
),
|
||||
|
||||
TP_fast_assign(
|
||||
__entry->rcuname = rcuname;
|
||||
__entry->level = level;
|
||||
__entry->grplo = grplo;
|
||||
__entry->grphi = grphi;
|
||||
__entry->gpevent = gpevent;
|
||||
),
|
||||
|
||||
TP_printk("%s %d %d %d %s",
|
||||
__entry->rcuname, __entry->level, __entry->grplo,
|
||||
__entry->grphi, __entry->gpevent)
|
||||
);
|
||||
|
||||
/*
|
||||
* Tracepoint for RCU no-CBs CPU callback handoffs. This event is intended
|
||||
* to assist debugging of these handoffs.
|
||||
@ -704,11 +775,15 @@ TRACE_EVENT(rcu_barrier,
|
||||
#else /* #ifdef CONFIG_RCU_TRACE */
|
||||
|
||||
#define trace_rcu_grace_period(rcuname, gpnum, gpevent) do { } while (0)
|
||||
#define trace_rcu_grace_period_init(rcuname, gpnum, level, grplo, grphi, \
|
||||
qsmask) do { } while (0)
|
||||
#define trace_rcu_future_grace_period(rcuname, gpnum, completed, c, \
|
||||
level, grplo, grphi, event) \
|
||||
do { } while (0)
|
||||
#define trace_rcu_grace_period_init(rcuname, gpnum, level, grplo, grphi, \
|
||||
qsmask) do { } while (0)
|
||||
#define trace_rcu_exp_grace_period(rcuname, gqseq, gpevent) \
|
||||
do { } while (0)
|
||||
#define trace_rcu_exp_funnel_lock(rcuname, level, grplo, grphi, gpevent) \
|
||||
do { } while (0)
|
||||
#define trace_rcu_nocb_wake(rcuname, cpu, reason) do { } while (0)
|
||||
#define trace_rcu_preempt_task(rcuname, pid, gpnum) do { } while (0)
|
||||
#define trace_rcu_unlock_preempted_task(rcuname, gpnum, pid) do { } while (0)
|
||||
|
||||
@ -5,6 +5,7 @@ KCOV_INSTRUMENT := n
|
||||
obj-y += update.o sync.o
|
||||
obj-$(CONFIG_SRCU) += srcu.o
|
||||
obj-$(CONFIG_RCU_TORTURE_TEST) += rcutorture.o
|
||||
obj-$(CONFIG_RCU_PERF_TEST) += rcuperf.o
|
||||
obj-$(CONFIG_TREE_RCU) += tree.o
|
||||
obj-$(CONFIG_PREEMPT_RCU) += tree.o
|
||||
obj-$(CONFIG_TREE_RCU_TRACE) += tree_trace.o
|
||||
|
||||
655
kernel/rcu/rcuperf.c
Normal file
655
kernel/rcu/rcuperf.c
Normal file
@ -0,0 +1,655 @@
|
||||
/*
|
||||
* Read-Copy Update module-based performance-test facility
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, you can access it online at
|
||||
* http://www.gnu.org/licenses/gpl-2.0.html.
|
||||
*
|
||||
* Copyright (C) IBM Corporation, 2015
|
||||
*
|
||||
* Authors: Paul E. McKenney <paulmck@us.ibm.com>
|
||||
*/
|
||||
#include <linux/types.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/kthread.h>
|
||||
#include <linux/err.h>
|
||||
#include <linux/spinlock.h>
|
||||
#include <linux/smp.h>
|
||||
#include <linux/rcupdate.h>
|
||||
#include <linux/interrupt.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/atomic.h>
|
||||
#include <linux/bitops.h>
|
||||
#include <linux/completion.h>
|
||||
#include <linux/moduleparam.h>
|
||||
#include <linux/percpu.h>
|
||||
#include <linux/notifier.h>
|
||||
#include <linux/reboot.h>
|
||||
#include <linux/freezer.h>
|
||||
#include <linux/cpu.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/stat.h>
|
||||
#include <linux/srcu.h>
|
||||
#include <linux/slab.h>
|
||||
#include <asm/byteorder.h>
|
||||
#include <linux/torture.h>
|
||||
#include <linux/vmalloc.h>
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_AUTHOR("Paul E. McKenney <paulmck@linux.vnet.ibm.com>");
|
||||
|
||||
#define PERF_FLAG "-perf:"
|
||||
#define PERFOUT_STRING(s) \
|
||||
pr_alert("%s" PERF_FLAG s "\n", perf_type)
|
||||
#define VERBOSE_PERFOUT_STRING(s) \
|
||||
do { if (verbose) pr_alert("%s" PERF_FLAG " %s\n", perf_type, s); } while (0)
|
||||
#define VERBOSE_PERFOUT_ERRSTRING(s) \
|
||||
do { if (verbose) pr_alert("%s" PERF_FLAG "!!! %s\n", perf_type, s); } while (0)
|
||||
|
||||
torture_param(bool, gp_exp, true, "Use expedited GP wait primitives");
|
||||
torture_param(int, holdoff, 10, "Holdoff time before test start (s)");
|
||||
torture_param(int, nreaders, -1, "Number of RCU reader threads");
|
||||
torture_param(int, nwriters, -1, "Number of RCU updater threads");
|
||||
torture_param(bool, shutdown, false, "Shutdown at end of performance tests.");
|
||||
torture_param(bool, verbose, true, "Enable verbose debugging printk()s");
|
||||
|
||||
static char *perf_type = "rcu";
|
||||
module_param(perf_type, charp, 0444);
|
||||
MODULE_PARM_DESC(perf_type, "Type of RCU to performance-test (rcu, rcu_bh, ...)");
|
||||
|
||||
static int nrealreaders;
|
||||
static int nrealwriters;
|
||||
static struct task_struct **writer_tasks;
|
||||
static struct task_struct **reader_tasks;
|
||||
static struct task_struct *shutdown_task;
|
||||
|
||||
static u64 **writer_durations;
|
||||
static int *writer_n_durations;
|
||||
static atomic_t n_rcu_perf_reader_started;
|
||||
static atomic_t n_rcu_perf_writer_started;
|
||||
static atomic_t n_rcu_perf_writer_finished;
|
||||
static wait_queue_head_t shutdown_wq;
|
||||
static u64 t_rcu_perf_writer_started;
|
||||
static u64 t_rcu_perf_writer_finished;
|
||||
static unsigned long b_rcu_perf_writer_started;
|
||||
static unsigned long b_rcu_perf_writer_finished;
|
||||
|
||||
static int rcu_perf_writer_state;
|
||||
#define RTWS_INIT 0
|
||||
#define RTWS_EXP_SYNC 1
|
||||
#define RTWS_SYNC 2
|
||||
#define RTWS_IDLE 2
|
||||
#define RTWS_STOPPING 3
|
||||
|
||||
#define MAX_MEAS 10000
|
||||
#define MIN_MEAS 100
|
||||
|
||||
#if defined(MODULE) || defined(CONFIG_RCU_PERF_TEST_RUNNABLE)
|
||||
#define RCUPERF_RUNNABLE_INIT 1
|
||||
#else
|
||||
#define RCUPERF_RUNNABLE_INIT 0
|
||||
#endif
|
||||
static int perf_runnable = RCUPERF_RUNNABLE_INIT;
|
||||
module_param(perf_runnable, int, 0444);
|
||||
MODULE_PARM_DESC(perf_runnable, "Start rcuperf at boot");
|
||||
|
||||
/*
|
||||
* Operations vector for selecting different types of tests.
|
||||
*/
|
||||
|
||||
struct rcu_perf_ops {
|
||||
int ptype;
|
||||
void (*init)(void);
|
||||
void (*cleanup)(void);
|
||||
int (*readlock)(void);
|
||||
void (*readunlock)(int idx);
|
||||
unsigned long (*started)(void);
|
||||
unsigned long (*completed)(void);
|
||||
unsigned long (*exp_completed)(void);
|
||||
void (*sync)(void);
|
||||
void (*exp_sync)(void);
|
||||
const char *name;
|
||||
};
|
||||
|
||||
static struct rcu_perf_ops *cur_ops;
|
||||
|
||||
/*
|
||||
* Definitions for rcu perf testing.
|
||||
*/
|
||||
|
||||
static int rcu_perf_read_lock(void) __acquires(RCU)
|
||||
{
|
||||
rcu_read_lock();
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void rcu_perf_read_unlock(int idx) __releases(RCU)
|
||||
{
|
||||
rcu_read_unlock();
|
||||
}
|
||||
|
||||
static unsigned long __maybe_unused rcu_no_completed(void)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void rcu_sync_perf_init(void)
|
||||
{
|
||||
}
|
||||
|
||||
static struct rcu_perf_ops rcu_ops = {
|
||||
.ptype = RCU_FLAVOR,
|
||||
.init = rcu_sync_perf_init,
|
||||
.readlock = rcu_perf_read_lock,
|
||||
.readunlock = rcu_perf_read_unlock,
|
||||
.started = rcu_batches_started,
|
||||
.completed = rcu_batches_completed,
|
||||
.exp_completed = rcu_exp_batches_completed,
|
||||
.sync = synchronize_rcu,
|
||||
.exp_sync = synchronize_rcu_expedited,
|
||||
.name = "rcu"
|
||||
};
|
||||
|
||||
/*
|
||||
* Definitions for rcu_bh perf testing.
|
||||
*/
|
||||
|
||||
static int rcu_bh_perf_read_lock(void) __acquires(RCU_BH)
|
||||
{
|
||||
rcu_read_lock_bh();
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void rcu_bh_perf_read_unlock(int idx) __releases(RCU_BH)
|
||||
{
|
||||
rcu_read_unlock_bh();
|
||||
}
|
||||
|
||||
static struct rcu_perf_ops rcu_bh_ops = {
|
||||
.ptype = RCU_BH_FLAVOR,
|
||||
.init = rcu_sync_perf_init,
|
||||
.readlock = rcu_bh_perf_read_lock,
|
||||
.readunlock = rcu_bh_perf_read_unlock,
|
||||
.started = rcu_batches_started_bh,
|
||||
.completed = rcu_batches_completed_bh,
|
||||
.exp_completed = rcu_exp_batches_completed_sched,
|
||||
.sync = synchronize_rcu_bh,
|
||||
.exp_sync = synchronize_rcu_bh_expedited,
|
||||
.name = "rcu_bh"
|
||||
};
|
||||
|
||||
/*
|
||||
* Definitions for srcu perf testing.
|
||||
*/
|
||||
|
||||
DEFINE_STATIC_SRCU(srcu_ctl_perf);
|
||||
static struct srcu_struct *srcu_ctlp = &srcu_ctl_perf;
|
||||
|
||||
static int srcu_perf_read_lock(void) __acquires(srcu_ctlp)
|
||||
{
|
||||
return srcu_read_lock(srcu_ctlp);
|
||||
}
|
||||
|
||||
static void srcu_perf_read_unlock(int idx) __releases(srcu_ctlp)
|
||||
{
|
||||
srcu_read_unlock(srcu_ctlp, idx);
|
||||
}
|
||||
|
||||
static unsigned long srcu_perf_completed(void)
|
||||
{
|
||||
return srcu_batches_completed(srcu_ctlp);
|
||||
}
|
||||
|
||||
static void srcu_perf_synchronize(void)
|
||||
{
|
||||
synchronize_srcu(srcu_ctlp);
|
||||
}
|
||||
|
||||
static void srcu_perf_synchronize_expedited(void)
|
||||
{
|
||||
synchronize_srcu_expedited(srcu_ctlp);
|
||||
}
|
||||
|
||||
static struct rcu_perf_ops srcu_ops = {
|
||||
.ptype = SRCU_FLAVOR,
|
||||
.init = rcu_sync_perf_init,
|
||||
.readlock = srcu_perf_read_lock,
|
||||
.readunlock = srcu_perf_read_unlock,
|
||||
.started = NULL,
|
||||
.completed = srcu_perf_completed,
|
||||
.exp_completed = srcu_perf_completed,
|
||||
.sync = srcu_perf_synchronize,
|
||||
.exp_sync = srcu_perf_synchronize_expedited,
|
||||
.name = "srcu"
|
||||
};
|
||||
|
||||
/*
|
||||
* Definitions for sched perf testing.
|
||||
*/
|
||||
|
||||
static int sched_perf_read_lock(void)
|
||||
{
|
||||
preempt_disable();
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void sched_perf_read_unlock(int idx)
|
||||
{
|
||||
preempt_enable();
|
||||
}
|
||||
|
||||
static struct rcu_perf_ops sched_ops = {
|
||||
.ptype = RCU_SCHED_FLAVOR,
|
||||
.init = rcu_sync_perf_init,
|
||||
.readlock = sched_perf_read_lock,
|
||||
.readunlock = sched_perf_read_unlock,
|
||||
.started = rcu_batches_started_sched,
|
||||
.completed = rcu_batches_completed_sched,
|
||||
.exp_completed = rcu_exp_batches_completed_sched,
|
||||
.sync = synchronize_sched,
|
||||
.exp_sync = synchronize_sched_expedited,
|
||||
.name = "sched"
|
||||
};
|
||||
|
||||
#ifdef CONFIG_TASKS_RCU
|
||||
|
||||
/*
|
||||
* Definitions for RCU-tasks perf testing.
|
||||
*/
|
||||
|
||||
static int tasks_perf_read_lock(void)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void tasks_perf_read_unlock(int idx)
|
||||
{
|
||||
}
|
||||
|
||||
static struct rcu_perf_ops tasks_ops = {
|
||||
.ptype = RCU_TASKS_FLAVOR,
|
||||
.init = rcu_sync_perf_init,
|
||||
.readlock = tasks_perf_read_lock,
|
||||
.readunlock = tasks_perf_read_unlock,
|
||||
.started = rcu_no_completed,
|
||||
.completed = rcu_no_completed,
|
||||
.sync = synchronize_rcu_tasks,
|
||||
.exp_sync = synchronize_rcu_tasks,
|
||||
.name = "tasks"
|
||||
};
|
||||
|
||||
#define RCUPERF_TASKS_OPS &tasks_ops,
|
||||
|
||||
static bool __maybe_unused torturing_tasks(void)
|
||||
{
|
||||
return cur_ops == &tasks_ops;
|
||||
}
|
||||
|
||||
#else /* #ifdef CONFIG_TASKS_RCU */
|
||||
|
||||
#define RCUPERF_TASKS_OPS
|
||||
|
||||
static bool __maybe_unused torturing_tasks(void)
|
||||
{
|
||||
return false;
|
||||
}
|
||||
|
||||
#endif /* #else #ifdef CONFIG_TASKS_RCU */
|
||||
|
||||
/*
|
||||
* If performance tests complete, wait for shutdown to commence.
|
||||
*/
|
||||
static void rcu_perf_wait_shutdown(void)
|
||||
{
|
||||
cond_resched_rcu_qs();
|
||||
if (atomic_read(&n_rcu_perf_writer_finished) < nrealwriters)
|
||||
return;
|
||||
while (!torture_must_stop())
|
||||
schedule_timeout_uninterruptible(1);
|
||||
}
|
||||
|
||||
/*
|
||||
* RCU perf reader kthread. Repeatedly does empty RCU read-side
|
||||
* critical section, minimizing update-side interference.
|
||||
*/
|
||||
static int
|
||||
rcu_perf_reader(void *arg)
|
||||
{
|
||||
unsigned long flags;
|
||||
int idx;
|
||||
long me = (long)arg;
|
||||
|
||||
VERBOSE_PERFOUT_STRING("rcu_perf_reader task started");
|
||||
set_cpus_allowed_ptr(current, cpumask_of(me % nr_cpu_ids));
|
||||
set_user_nice(current, MAX_NICE);
|
||||
atomic_inc(&n_rcu_perf_reader_started);
|
||||
|
||||
do {
|
||||
local_irq_save(flags);
|
||||
idx = cur_ops->readlock();
|
||||
cur_ops->readunlock(idx);
|
||||
local_irq_restore(flags);
|
||||
rcu_perf_wait_shutdown();
|
||||
} while (!torture_must_stop());
|
||||
torture_kthread_stopping("rcu_perf_reader");
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* RCU perf writer kthread. Repeatedly does a grace period.
|
||||
*/
|
||||
static int
|
||||
rcu_perf_writer(void *arg)
|
||||
{
|
||||
int i = 0;
|
||||
int i_max;
|
||||
long me = (long)arg;
|
||||
struct sched_param sp;
|
||||
bool started = false, done = false, alldone = false;
|
||||
u64 t;
|
||||
u64 *wdp;
|
||||
u64 *wdpp = writer_durations[me];
|
||||
|
||||
VERBOSE_PERFOUT_STRING("rcu_perf_writer task started");
|
||||
WARN_ON(rcu_gp_is_expedited() && !rcu_gp_is_normal() && !gp_exp);
|
||||
WARN_ON(rcu_gp_is_normal() && gp_exp);
|
||||
WARN_ON(!wdpp);
|
||||
set_cpus_allowed_ptr(current, cpumask_of(me % nr_cpu_ids));
|
||||
sp.sched_priority = 1;
|
||||
sched_setscheduler_nocheck(current, SCHED_FIFO, &sp);
|
||||
|
||||
if (holdoff)
|
||||
schedule_timeout_uninterruptible(holdoff * HZ);
|
||||
|
||||
t = ktime_get_mono_fast_ns();
|
||||
if (atomic_inc_return(&n_rcu_perf_writer_started) >= nrealwriters) {
|
||||
t_rcu_perf_writer_started = t;
|
||||
if (gp_exp) {
|
||||
b_rcu_perf_writer_started =
|
||||
cur_ops->exp_completed() / 2;
|
||||
} else {
|
||||
b_rcu_perf_writer_started =
|
||||
cur_ops->completed();
|
||||
}
|
||||
}
|
||||
|
||||
do {
|
||||
wdp = &wdpp[i];
|
||||
*wdp = ktime_get_mono_fast_ns();
|
||||
if (gp_exp) {
|
||||
rcu_perf_writer_state = RTWS_EXP_SYNC;
|
||||
cur_ops->exp_sync();
|
||||
} else {
|
||||
rcu_perf_writer_state = RTWS_SYNC;
|
||||
cur_ops->sync();
|
||||
}
|
||||
rcu_perf_writer_state = RTWS_IDLE;
|
||||
t = ktime_get_mono_fast_ns();
|
||||
*wdp = t - *wdp;
|
||||
i_max = i;
|
||||
if (!started &&
|
||||
atomic_read(&n_rcu_perf_writer_started) >= nrealwriters)
|
||||
started = true;
|
||||
if (!done && i >= MIN_MEAS) {
|
||||
done = true;
|
||||
sp.sched_priority = 0;
|
||||
sched_setscheduler_nocheck(current,
|
||||
SCHED_NORMAL, &sp);
|
||||
pr_alert("%s" PERF_FLAG
|
||||
"rcu_perf_writer %ld has %d measurements\n",
|
||||
perf_type, me, MIN_MEAS);
|
||||
if (atomic_inc_return(&n_rcu_perf_writer_finished) >=
|
||||
nrealwriters) {
|
||||
schedule_timeout_interruptible(10);
|
||||
rcu_ftrace_dump(DUMP_ALL);
|
||||
PERFOUT_STRING("Test complete");
|
||||
t_rcu_perf_writer_finished = t;
|
||||
if (gp_exp) {
|
||||
b_rcu_perf_writer_finished =
|
||||
cur_ops->exp_completed() / 2;
|
||||
} else {
|
||||
b_rcu_perf_writer_finished =
|
||||
cur_ops->completed();
|
||||
}
|
||||
if (shutdown) {
|
||||
smp_mb(); /* Assign before wake. */
|
||||
wake_up(&shutdown_wq);
|
||||
}
|
||||
}
|
||||
}
|
||||
if (done && !alldone &&
|
||||
atomic_read(&n_rcu_perf_writer_finished) >= nrealwriters)
|
||||
alldone = true;
|
||||
if (started && !alldone && i < MAX_MEAS - 1)
|
||||
i++;
|
||||
rcu_perf_wait_shutdown();
|
||||
} while (!torture_must_stop());
|
||||
rcu_perf_writer_state = RTWS_STOPPING;
|
||||
writer_n_durations[me] = i_max;
|
||||
torture_kthread_stopping("rcu_perf_writer");
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline void
|
||||
rcu_perf_print_module_parms(struct rcu_perf_ops *cur_ops, const char *tag)
|
||||
{
|
||||
pr_alert("%s" PERF_FLAG
|
||||
"--- %s: nreaders=%d nwriters=%d verbose=%d shutdown=%d\n",
|
||||
perf_type, tag, nrealreaders, nrealwriters, verbose, shutdown);
|
||||
}
|
||||
|
||||
static void
|
||||
rcu_perf_cleanup(void)
|
||||
{
|
||||
int i;
|
||||
int j;
|
||||
int ngps = 0;
|
||||
u64 *wdp;
|
||||
u64 *wdpp;
|
||||
|
||||
if (torture_cleanup_begin())
|
||||
return;
|
||||
|
||||
if (reader_tasks) {
|
||||
for (i = 0; i < nrealreaders; i++)
|
||||
torture_stop_kthread(rcu_perf_reader,
|
||||
reader_tasks[i]);
|
||||
kfree(reader_tasks);
|
||||
}
|
||||
|
||||
if (writer_tasks) {
|
||||
for (i = 0; i < nrealwriters; i++) {
|
||||
torture_stop_kthread(rcu_perf_writer,
|
||||
writer_tasks[i]);
|
||||
if (!writer_n_durations)
|
||||
continue;
|
||||
j = writer_n_durations[i];
|
||||
pr_alert("%s%s writer %d gps: %d\n",
|
||||
perf_type, PERF_FLAG, i, j);
|
||||
ngps += j;
|
||||
}
|
||||
pr_alert("%s%s start: %llu end: %llu duration: %llu gps: %d batches: %ld\n",
|
||||
perf_type, PERF_FLAG,
|
||||
t_rcu_perf_writer_started, t_rcu_perf_writer_finished,
|
||||
t_rcu_perf_writer_finished -
|
||||
t_rcu_perf_writer_started,
|
||||
ngps,
|
||||
b_rcu_perf_writer_finished -
|
||||
b_rcu_perf_writer_started);
|
||||
for (i = 0; i < nrealwriters; i++) {
|
||||
if (!writer_durations)
|
||||
break;
|
||||
if (!writer_n_durations)
|
||||
continue;
|
||||
wdpp = writer_durations[i];
|
||||
if (!wdpp)
|
||||
continue;
|
||||
for (j = 0; j <= writer_n_durations[i]; j++) {
|
||||
wdp = &wdpp[j];
|
||||
pr_alert("%s%s %4d writer-duration: %5d %llu\n",
|
||||
perf_type, PERF_FLAG,
|
||||
i, j, *wdp);
|
||||
if (j % 100 == 0)
|
||||
schedule_timeout_uninterruptible(1);
|
||||
}
|
||||
kfree(writer_durations[i]);
|
||||
}
|
||||
kfree(writer_tasks);
|
||||
kfree(writer_durations);
|
||||
kfree(writer_n_durations);
|
||||
}
|
||||
|
||||
/* Do flavor-specific cleanup operations. */
|
||||
if (cur_ops->cleanup != NULL)
|
||||
cur_ops->cleanup();
|
||||
|
||||
torture_cleanup_end();
|
||||
}
|
||||
|
||||
/*
|
||||
* Return the number if non-negative. If -1, the number of CPUs.
|
||||
* If less than -1, that much less than the number of CPUs, but
|
||||
* at least one.
|
||||
*/
|
||||
static int compute_real(int n)
|
||||
{
|
||||
int nr;
|
||||
|
||||
if (n >= 0) {
|
||||
nr = n;
|
||||
} else {
|
||||
nr = num_online_cpus() + 1 + n;
|
||||
if (nr <= 0)
|
||||
nr = 1;
|
||||
}
|
||||
return nr;
|
||||
}
|
||||
|
||||
/*
|
||||
* RCU perf shutdown kthread. Just waits to be awakened, then shuts
|
||||
* down system.
|
||||
*/
|
||||
static int
|
||||
rcu_perf_shutdown(void *arg)
|
||||
{
|
||||
do {
|
||||
wait_event(shutdown_wq,
|
||||
atomic_read(&n_rcu_perf_writer_finished) >=
|
||||
nrealwriters);
|
||||
} while (atomic_read(&n_rcu_perf_writer_finished) < nrealwriters);
|
||||
smp_mb(); /* Wake before output. */
|
||||
rcu_perf_cleanup();
|
||||
kernel_power_off();
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static int __init
|
||||
rcu_perf_init(void)
|
||||
{
|
||||
long i;
|
||||
int firsterr = 0;
|
||||
static struct rcu_perf_ops *perf_ops[] = {
|
||||
&rcu_ops, &rcu_bh_ops, &srcu_ops, &sched_ops,
|
||||
RCUPERF_TASKS_OPS
|
||||
};
|
||||
|
||||
if (!torture_init_begin(perf_type, verbose, &perf_runnable))
|
||||
return -EBUSY;
|
||||
|
||||
/* Process args and tell the world that the perf'er is on the job. */
|
||||
for (i = 0; i < ARRAY_SIZE(perf_ops); i++) {
|
||||
cur_ops = perf_ops[i];
|
||||
if (strcmp(perf_type, cur_ops->name) == 0)
|
||||
break;
|
||||
}
|
||||
if (i == ARRAY_SIZE(perf_ops)) {
|
||||
pr_alert("rcu-perf: invalid perf type: \"%s\"\n",
|
||||
perf_type);
|
||||
pr_alert("rcu-perf types:");
|
||||
for (i = 0; i < ARRAY_SIZE(perf_ops); i++)
|
||||
pr_alert(" %s", perf_ops[i]->name);
|
||||
pr_alert("\n");
|
||||
firsterr = -EINVAL;
|
||||
goto unwind;
|
||||
}
|
||||
if (cur_ops->init)
|
||||
cur_ops->init();
|
||||
|
||||
nrealwriters = compute_real(nwriters);
|
||||
nrealreaders = compute_real(nreaders);
|
||||
atomic_set(&n_rcu_perf_reader_started, 0);
|
||||
atomic_set(&n_rcu_perf_writer_started, 0);
|
||||
atomic_set(&n_rcu_perf_writer_finished, 0);
|
||||
rcu_perf_print_module_parms(cur_ops, "Start of test");
|
||||
|
||||
/* Start up the kthreads. */
|
||||
|
||||
if (shutdown) {
|
||||
init_waitqueue_head(&shutdown_wq);
|
||||
firsterr = torture_create_kthread(rcu_perf_shutdown, NULL,
|
||||
shutdown_task);
|
||||
if (firsterr)
|
||||
goto unwind;
|
||||
schedule_timeout_uninterruptible(1);
|
||||
}
|
||||
reader_tasks = kcalloc(nrealreaders, sizeof(reader_tasks[0]),
|
||||
GFP_KERNEL);
|
||||
if (reader_tasks == NULL) {
|
||||
VERBOSE_PERFOUT_ERRSTRING("out of memory");
|
||||
firsterr = -ENOMEM;
|
||||
goto unwind;
|
||||
}
|
||||
for (i = 0; i < nrealreaders; i++) {
|
||||
firsterr = torture_create_kthread(rcu_perf_reader, (void *)i,
|
||||
reader_tasks[i]);
|
||||
if (firsterr)
|
||||
goto unwind;
|
||||
}
|
||||
while (atomic_read(&n_rcu_perf_reader_started) < nrealreaders)
|
||||
schedule_timeout_uninterruptible(1);
|
||||
writer_tasks = kcalloc(nrealwriters, sizeof(reader_tasks[0]),
|
||||
GFP_KERNEL);
|
||||
writer_durations = kcalloc(nrealwriters, sizeof(*writer_durations),
|
||||
GFP_KERNEL);
|
||||
writer_n_durations =
|
||||
kcalloc(nrealwriters, sizeof(*writer_n_durations),
|
||||
GFP_KERNEL);
|
||||
if (!writer_tasks || !writer_durations || !writer_n_durations) {
|
||||
VERBOSE_PERFOUT_ERRSTRING("out of memory");
|
||||
firsterr = -ENOMEM;
|
||||
goto unwind;
|
||||
}
|
||||
for (i = 0; i < nrealwriters; i++) {
|
||||
writer_durations[i] =
|
||||
kcalloc(MAX_MEAS, sizeof(*writer_durations[i]),
|
||||
GFP_KERNEL);
|
||||
if (!writer_durations[i])
|
||||
goto unwind;
|
||||
firsterr = torture_create_kthread(rcu_perf_writer, (void *)i,
|
||||
writer_tasks[i]);
|
||||
if (firsterr)
|
||||
goto unwind;
|
||||
}
|
||||
torture_init_end();
|
||||
return 0;
|
||||
|
||||
unwind:
|
||||
torture_init_end();
|
||||
rcu_perf_cleanup();
|
||||
return firsterr;
|
||||
}
|
||||
|
||||
module_init(rcu_perf_init);
|
||||
module_exit(rcu_perf_cleanup);
|
||||
@ -130,8 +130,8 @@ static struct rcu_torture __rcu *rcu_torture_current;
|
||||
static unsigned long rcu_torture_current_version;
|
||||
static struct rcu_torture rcu_tortures[10 * RCU_TORTURE_PIPE_LEN];
|
||||
static DEFINE_SPINLOCK(rcu_torture_lock);
|
||||
static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], rcu_torture_count) = { 0 };
|
||||
static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], rcu_torture_batch) = { 0 };
|
||||
static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], rcu_torture_count);
|
||||
static DEFINE_PER_CPU(long [RCU_TORTURE_PIPE_LEN + 1], rcu_torture_batch);
|
||||
static atomic_t rcu_torture_wcount[RCU_TORTURE_PIPE_LEN + 1];
|
||||
static atomic_t n_rcu_torture_alloc;
|
||||
static atomic_t n_rcu_torture_alloc_fail;
|
||||
@ -916,7 +916,7 @@ rcu_torture_fqs(void *arg)
|
||||
static int
|
||||
rcu_torture_writer(void *arg)
|
||||
{
|
||||
bool can_expedite = !rcu_gp_is_expedited();
|
||||
bool can_expedite = !rcu_gp_is_expedited() && !rcu_gp_is_normal();
|
||||
int expediting = 0;
|
||||
unsigned long gp_snap;
|
||||
bool gp_cond1 = gp_cond, gp_exp1 = gp_exp, gp_normal1 = gp_normal;
|
||||
@ -932,7 +932,7 @@ rcu_torture_writer(void *arg)
|
||||
VERBOSE_TOROUT_STRING("rcu_torture_writer task started");
|
||||
if (!can_expedite) {
|
||||
pr_alert("%s" TORTURE_FLAG
|
||||
" Grace periods expedited from boot/sysfs for %s,\n",
|
||||
" GP expediting controlled from boot/sysfs for %s,\n",
|
||||
torture_type, cur_ops->name);
|
||||
pr_alert("%s" TORTURE_FLAG
|
||||
" Disabled dynamic grace-period expediting.\n",
|
||||
@ -1082,17 +1082,6 @@ rcu_torture_fakewriter(void *arg)
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void rcutorture_trace_dump(void)
|
||||
{
|
||||
static atomic_t beenhere = ATOMIC_INIT(0);
|
||||
|
||||
if (atomic_read(&beenhere))
|
||||
return;
|
||||
if (atomic_xchg(&beenhere, 1) != 0)
|
||||
return;
|
||||
ftrace_dump(DUMP_ALL);
|
||||
}
|
||||
|
||||
/*
|
||||
* RCU torture reader from timer handler. Dereferences rcu_torture_current,
|
||||
* incrementing the corresponding element of the pipeline array. The
|
||||
@ -1142,7 +1131,7 @@ static void rcu_torture_timer(unsigned long unused)
|
||||
if (pipe_count > 1) {
|
||||
do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu, ts,
|
||||
started, completed);
|
||||
rcutorture_trace_dump();
|
||||
rcu_ftrace_dump(DUMP_ALL);
|
||||
}
|
||||
__this_cpu_inc(rcu_torture_count[pipe_count]);
|
||||
completed = completed - started;
|
||||
@ -1215,7 +1204,7 @@ rcu_torture_reader(void *arg)
|
||||
if (pipe_count > 1) {
|
||||
do_trace_rcu_torture_read(cur_ops->name, &p->rtort_rcu,
|
||||
ts, started, completed);
|
||||
rcutorture_trace_dump();
|
||||
rcu_ftrace_dump(DUMP_ALL);
|
||||
}
|
||||
__this_cpu_inc(rcu_torture_count[pipe_count]);
|
||||
completed = completed - started;
|
||||
@ -1333,7 +1322,7 @@ rcu_torture_stats_print(void)
|
||||
rcu_torture_writer_state,
|
||||
gpnum, completed, flags);
|
||||
show_rcu_gp_kthreads();
|
||||
rcutorture_trace_dump();
|
||||
rcu_ftrace_dump(DUMP_ALL);
|
||||
}
|
||||
rtcv_snap = rcu_torture_current_version;
|
||||
}
|
||||
@ -1489,7 +1478,9 @@ static int rcu_torture_barrier_cbs(void *arg)
|
||||
* The above smp_load_acquire() ensures barrier_phase load
|
||||
* is ordered before the folloiwng ->call().
|
||||
*/
|
||||
local_irq_disable(); /* Just to test no-irq call_rcu(). */
|
||||
cur_ops->call(&rcu, rcu_torture_barrier_cbf);
|
||||
local_irq_enable();
|
||||
if (atomic_dec_and_test(&barrier_cbs_count))
|
||||
wake_up(&barrier_wq);
|
||||
} while (!torture_must_stop());
|
||||
@ -1596,7 +1587,7 @@ static int rcutorture_cpu_notify(struct notifier_block *self,
|
||||
{
|
||||
long cpu = (long)hcpu;
|
||||
|
||||
switch (action) {
|
||||
switch (action & ~CPU_TASKS_FROZEN) {
|
||||
case CPU_ONLINE:
|
||||
case CPU_DOWN_FAILED:
|
||||
(void)rcutorture_booster_init(cpu);
|
||||
|
||||
@ -102,6 +102,8 @@ struct rcu_state sname##_state = { \
|
||||
.barrier_mutex = __MUTEX_INITIALIZER(sname##_state.barrier_mutex), \
|
||||
.name = RCU_STATE_NAME(sname), \
|
||||
.abbr = sabbr, \
|
||||
.exp_mutex = __MUTEX_INITIALIZER(sname##_state.exp_mutex), \
|
||||
.exp_wake_mutex = __MUTEX_INITIALIZER(sname##_state.exp_wake_mutex), \
|
||||
}
|
||||
|
||||
RCU_STATE_INITIALIZER(rcu_sched, 's', call_rcu_sched);
|
||||
@ -370,6 +372,21 @@ void rcu_all_qs(void)
|
||||
rcu_momentary_dyntick_idle();
|
||||
local_irq_restore(flags);
|
||||
}
|
||||
if (unlikely(raw_cpu_read(rcu_sched_data.cpu_no_qs.b.exp))) {
|
||||
/*
|
||||
* Yes, we just checked a per-CPU variable with preemption
|
||||
* enabled, so we might be migrated to some other CPU at
|
||||
* this point. That is OK because in that case, the
|
||||
* migration will supply the needed quiescent state.
|
||||
* We might end up needlessly disabling preemption and
|
||||
* invoking rcu_sched_qs() on the destination CPU, but
|
||||
* the probability and cost are both quite low, so this
|
||||
* should not be a problem in practice.
|
||||
*/
|
||||
preempt_disable();
|
||||
rcu_sched_qs();
|
||||
preempt_enable();
|
||||
}
|
||||
this_cpu_inc(rcu_qs_ctr);
|
||||
barrier(); /* Avoid RCU read-side critical sections leaking up. */
|
||||
}
|
||||
@ -385,9 +402,11 @@ module_param(qlowmark, long, 0444);
|
||||
|
||||
static ulong jiffies_till_first_fqs = ULONG_MAX;
|
||||
static ulong jiffies_till_next_fqs = ULONG_MAX;
|
||||
static bool rcu_kick_kthreads;
|
||||
|
||||
module_param(jiffies_till_first_fqs, ulong, 0644);
|
||||
module_param(jiffies_till_next_fqs, ulong, 0644);
|
||||
module_param(rcu_kick_kthreads, bool, 0644);
|
||||
|
||||
/*
|
||||
* How long the grace period must be before we start recruiting
|
||||
@ -459,6 +478,28 @@ unsigned long rcu_batches_completed_bh(void)
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(rcu_batches_completed_bh);
|
||||
|
||||
/*
|
||||
* Return the number of RCU expedited batches completed thus far for
|
||||
* debug & stats. Odd numbers mean that a batch is in progress, even
|
||||
* numbers mean idle. The value returned will thus be roughly double
|
||||
* the cumulative batches since boot.
|
||||
*/
|
||||
unsigned long rcu_exp_batches_completed(void)
|
||||
{
|
||||
return rcu_state_p->expedited_sequence;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(rcu_exp_batches_completed);
|
||||
|
||||
/*
|
||||
* Return the number of RCU-sched expedited batches completed thus far
|
||||
* for debug & stats. Similar to rcu_exp_batches_completed().
|
||||
*/
|
||||
unsigned long rcu_exp_batches_completed_sched(void)
|
||||
{
|
||||
return rcu_sched_state.expedited_sequence;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(rcu_exp_batches_completed_sched);
|
||||
|
||||
/*
|
||||
* Force a quiescent state.
|
||||
*/
|
||||
@ -637,7 +678,7 @@ static void rcu_eqs_enter_common(long long oldval, bool user)
|
||||
idle_task(smp_processor_id());
|
||||
|
||||
trace_rcu_dyntick(TPS("Error on entry: not idle task"), oldval, 0);
|
||||
ftrace_dump(DUMP_ORIG);
|
||||
rcu_ftrace_dump(DUMP_ORIG);
|
||||
WARN_ONCE(1, "Current pid: %d comm: %s / Idle pid: %d comm: %s",
|
||||
current->pid, current->comm,
|
||||
idle->pid, idle->comm); /* must be idle task! */
|
||||
@ -799,7 +840,7 @@ static void rcu_eqs_exit_common(long long oldval, int user)
|
||||
|
||||
trace_rcu_dyntick(TPS("Error on exit: not idle task"),
|
||||
oldval, rdtp->dynticks_nesting);
|
||||
ftrace_dump(DUMP_ORIG);
|
||||
rcu_ftrace_dump(DUMP_ORIG);
|
||||
WARN_ONCE(1, "Current pid: %d comm: %s / Idle pid: %d comm: %s",
|
||||
current->pid, current->comm,
|
||||
idle->pid, idle->comm); /* must be idle task! */
|
||||
@ -1224,8 +1265,10 @@ static void rcu_check_gp_kthread_starvation(struct rcu_state *rsp)
|
||||
rsp->gp_flags,
|
||||
gp_state_getname(rsp->gp_state), rsp->gp_state,
|
||||
rsp->gp_kthread ? rsp->gp_kthread->state : ~0);
|
||||
if (rsp->gp_kthread)
|
||||
if (rsp->gp_kthread) {
|
||||
sched_show_task(rsp->gp_kthread);
|
||||
wake_up_process(rsp->gp_kthread);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
@ -1249,6 +1292,25 @@ static void rcu_dump_cpu_stacks(struct rcu_state *rsp)
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* If too much time has passed in the current grace period, and if
|
||||
* so configured, go kick the relevant kthreads.
|
||||
*/
|
||||
static void rcu_stall_kick_kthreads(struct rcu_state *rsp)
|
||||
{
|
||||
unsigned long j;
|
||||
|
||||
if (!rcu_kick_kthreads)
|
||||
return;
|
||||
j = READ_ONCE(rsp->jiffies_kick_kthreads);
|
||||
if (time_after(jiffies, j) && rsp->gp_kthread) {
|
||||
WARN_ONCE(1, "Kicking %s grace-period kthread\n", rsp->name);
|
||||
rcu_ftrace_dump(DUMP_ALL);
|
||||
wake_up_process(rsp->gp_kthread);
|
||||
WRITE_ONCE(rsp->jiffies_kick_kthreads, j + HZ);
|
||||
}
|
||||
}
|
||||
|
||||
static void print_other_cpu_stall(struct rcu_state *rsp, unsigned long gpnum)
|
||||
{
|
||||
int cpu;
|
||||
@ -1260,6 +1322,11 @@ static void print_other_cpu_stall(struct rcu_state *rsp, unsigned long gpnum)
|
||||
struct rcu_node *rnp = rcu_get_root(rsp);
|
||||
long totqlen = 0;
|
||||
|
||||
/* Kick and suppress, if so configured. */
|
||||
rcu_stall_kick_kthreads(rsp);
|
||||
if (rcu_cpu_stall_suppress)
|
||||
return;
|
||||
|
||||
/* Only let one CPU complain about others per time interval. */
|
||||
|
||||
raw_spin_lock_irqsave_rcu_node(rnp, flags);
|
||||
@ -1333,6 +1400,11 @@ static void print_cpu_stall(struct rcu_state *rsp)
|
||||
struct rcu_node *rnp = rcu_get_root(rsp);
|
||||
long totqlen = 0;
|
||||
|
||||
/* Kick and suppress, if so configured. */
|
||||
rcu_stall_kick_kthreads(rsp);
|
||||
if (rcu_cpu_stall_suppress)
|
||||
return;
|
||||
|
||||
/*
|
||||
* OK, time to rat on ourselves...
|
||||
* See Documentation/RCU/stallwarn.txt for info on how to debug
|
||||
@ -1377,8 +1449,10 @@ static void check_cpu_stall(struct rcu_state *rsp, struct rcu_data *rdp)
|
||||
unsigned long js;
|
||||
struct rcu_node *rnp;
|
||||
|
||||
if (rcu_cpu_stall_suppress || !rcu_gp_in_progress(rsp))
|
||||
if ((rcu_cpu_stall_suppress && !rcu_kick_kthreads) ||
|
||||
!rcu_gp_in_progress(rsp))
|
||||
return;
|
||||
rcu_stall_kick_kthreads(rsp);
|
||||
j = jiffies;
|
||||
|
||||
/*
|
||||
@ -2117,8 +2191,11 @@ static int __noreturn rcu_gp_kthread(void *arg)
|
||||
}
|
||||
ret = 0;
|
||||
for (;;) {
|
||||
if (!ret)
|
||||
if (!ret) {
|
||||
rsp->jiffies_force_qs = jiffies + j;
|
||||
WRITE_ONCE(rsp->jiffies_kick_kthreads,
|
||||
jiffies + 3 * j);
|
||||
}
|
||||
trace_rcu_grace_period(rsp->name,
|
||||
READ_ONCE(rsp->gpnum),
|
||||
TPS("fqswait"));
|
||||
@ -2144,6 +2221,15 @@ static int __noreturn rcu_gp_kthread(void *arg)
|
||||
TPS("fqsend"));
|
||||
cond_resched_rcu_qs();
|
||||
WRITE_ONCE(rsp->gp_activity, jiffies);
|
||||
ret = 0; /* Force full wait till next FQS. */
|
||||
j = jiffies_till_next_fqs;
|
||||
if (j > HZ) {
|
||||
j = HZ;
|
||||
jiffies_till_next_fqs = HZ;
|
||||
} else if (j < 1) {
|
||||
j = 1;
|
||||
jiffies_till_next_fqs = 1;
|
||||
}
|
||||
} else {
|
||||
/* Deal with stray signal. */
|
||||
cond_resched_rcu_qs();
|
||||
@ -2152,14 +2238,12 @@ static int __noreturn rcu_gp_kthread(void *arg)
|
||||
trace_rcu_grace_period(rsp->name,
|
||||
READ_ONCE(rsp->gpnum),
|
||||
TPS("fqswaitsig"));
|
||||
}
|
||||
j = jiffies_till_next_fqs;
|
||||
if (j > HZ) {
|
||||
j = HZ;
|
||||
jiffies_till_next_fqs = HZ;
|
||||
} else if (j < 1) {
|
||||
ret = 1; /* Keep old FQS timing. */
|
||||
j = jiffies;
|
||||
if (time_after(jiffies, rsp->jiffies_force_qs))
|
||||
j = 1;
|
||||
jiffies_till_next_fqs = 1;
|
||||
else
|
||||
j = rsp->jiffies_force_qs - j;
|
||||
}
|
||||
}
|
||||
|
||||
@ -3376,8 +3460,12 @@ static void rcu_exp_gp_seq_end(struct rcu_state *rsp)
|
||||
}
|
||||
static unsigned long rcu_exp_gp_seq_snap(struct rcu_state *rsp)
|
||||
{
|
||||
unsigned long s;
|
||||
|
||||
smp_mb(); /* Caller's modifications seen first by other CPUs. */
|
||||
return rcu_seq_snap(&rsp->expedited_sequence);
|
||||
s = rcu_seq_snap(&rsp->expedited_sequence);
|
||||
trace_rcu_exp_grace_period(rsp->name, s, TPS("snap"));
|
||||
return s;
|
||||
}
|
||||
static bool rcu_exp_gp_seq_done(struct rcu_state *rsp, unsigned long s)
|
||||
{
|
||||
@ -3469,7 +3557,7 @@ static void __maybe_unused sync_exp_reset_tree(struct rcu_state *rsp)
|
||||
* for the current expedited grace period. Works only for preemptible
|
||||
* RCU -- other RCU implementation use other means.
|
||||
*
|
||||
* Caller must hold the root rcu_node's exp_funnel_mutex.
|
||||
* Caller must hold the rcu_state's exp_mutex.
|
||||
*/
|
||||
static int sync_rcu_preempt_exp_done(struct rcu_node *rnp)
|
||||
{
|
||||
@ -3485,8 +3573,8 @@ static int sync_rcu_preempt_exp_done(struct rcu_node *rnp)
|
||||
* recursively up the tree. (Calm down, calm down, we do the recursion
|
||||
* iteratively!)
|
||||
*
|
||||
* Caller must hold the root rcu_node's exp_funnel_mutex and the
|
||||
* specified rcu_node structure's ->lock.
|
||||
* Caller must hold the rcu_state's exp_mutex and the specified rcu_node
|
||||
* structure's ->lock.
|
||||
*/
|
||||
static void __rcu_report_exp_rnp(struct rcu_state *rsp, struct rcu_node *rnp,
|
||||
bool wake, unsigned long flags)
|
||||
@ -3523,7 +3611,7 @@ static void __rcu_report_exp_rnp(struct rcu_state *rsp, struct rcu_node *rnp,
|
||||
* Report expedited quiescent state for specified node. This is a
|
||||
* lock-acquisition wrapper function for __rcu_report_exp_rnp().
|
||||
*
|
||||
* Caller must hold the root rcu_node's exp_funnel_mutex.
|
||||
* Caller must hold the rcu_state's exp_mutex.
|
||||
*/
|
||||
static void __maybe_unused rcu_report_exp_rnp(struct rcu_state *rsp,
|
||||
struct rcu_node *rnp, bool wake)
|
||||
@ -3536,8 +3624,8 @@ static void __maybe_unused rcu_report_exp_rnp(struct rcu_state *rsp,
|
||||
|
||||
/*
|
||||
* Report expedited quiescent state for multiple CPUs, all covered by the
|
||||
* specified leaf rcu_node structure. Caller must hold the root
|
||||
* rcu_node's exp_funnel_mutex.
|
||||
* specified leaf rcu_node structure. Caller must hold the rcu_state's
|
||||
* exp_mutex.
|
||||
*/
|
||||
static void rcu_report_exp_cpu_mult(struct rcu_state *rsp, struct rcu_node *rnp,
|
||||
unsigned long mask, bool wake)
|
||||
@ -3555,7 +3643,6 @@ static void rcu_report_exp_cpu_mult(struct rcu_state *rsp, struct rcu_node *rnp,
|
||||
|
||||
/*
|
||||
* Report expedited quiescent state for specified rcu_data (CPU).
|
||||
* Caller must hold the root rcu_node's exp_funnel_mutex.
|
||||
*/
|
||||
static void rcu_report_exp_rdp(struct rcu_state *rsp, struct rcu_data *rdp,
|
||||
bool wake)
|
||||
@ -3564,15 +3651,11 @@ static void rcu_report_exp_rdp(struct rcu_state *rsp, struct rcu_data *rdp,
|
||||
}
|
||||
|
||||
/* Common code for synchronize_{rcu,sched}_expedited() work-done checking. */
|
||||
static bool sync_exp_work_done(struct rcu_state *rsp, struct rcu_node *rnp,
|
||||
struct rcu_data *rdp,
|
||||
atomic_long_t *stat, unsigned long s)
|
||||
static bool sync_exp_work_done(struct rcu_state *rsp, atomic_long_t *stat,
|
||||
unsigned long s)
|
||||
{
|
||||
if (rcu_exp_gp_seq_done(rsp, s)) {
|
||||
if (rnp)
|
||||
mutex_unlock(&rnp->exp_funnel_mutex);
|
||||
else if (rdp)
|
||||
mutex_unlock(&rdp->exp_funnel_mutex);
|
||||
trace_rcu_exp_grace_period(rsp->name, s, TPS("done"));
|
||||
/* Ensure test happens before caller kfree(). */
|
||||
smp_mb__before_atomic(); /* ^^^ */
|
||||
atomic_long_inc(stat);
|
||||
@ -3582,59 +3665,65 @@ static bool sync_exp_work_done(struct rcu_state *rsp, struct rcu_node *rnp,
|
||||
}
|
||||
|
||||
/*
|
||||
* Funnel-lock acquisition for expedited grace periods. Returns a
|
||||
* pointer to the root rcu_node structure, or NULL if some other
|
||||
* task did the expedited grace period for us.
|
||||
* Funnel-lock acquisition for expedited grace periods. Returns true
|
||||
* if some other task completed an expedited grace period that this task
|
||||
* can piggy-back on, and with no mutex held. Otherwise, returns false
|
||||
* with the mutex held, indicating that the caller must actually do the
|
||||
* expedited grace period.
|
||||
*/
|
||||
static struct rcu_node *exp_funnel_lock(struct rcu_state *rsp, unsigned long s)
|
||||
static bool exp_funnel_lock(struct rcu_state *rsp, unsigned long s)
|
||||
{
|
||||
struct rcu_data *rdp = per_cpu_ptr(rsp->rda, raw_smp_processor_id());
|
||||
struct rcu_node *rnp0;
|
||||
struct rcu_node *rnp1 = NULL;
|
||||
struct rcu_node *rnp = rdp->mynode;
|
||||
struct rcu_node *rnp_root = rcu_get_root(rsp);
|
||||
|
||||
/* Low-contention fastpath. */
|
||||
if (ULONG_CMP_LT(READ_ONCE(rnp->exp_seq_rq), s) &&
|
||||
(rnp == rnp_root ||
|
||||
ULONG_CMP_LT(READ_ONCE(rnp_root->exp_seq_rq), s)) &&
|
||||
!mutex_is_locked(&rsp->exp_mutex) &&
|
||||
mutex_trylock(&rsp->exp_mutex))
|
||||
goto fastpath;
|
||||
|
||||
/*
|
||||
* First try directly acquiring the root lock in order to reduce
|
||||
* latency in the common case where expedited grace periods are
|
||||
* rare. We check mutex_is_locked() to avoid pathological levels of
|
||||
* memory contention on ->exp_funnel_mutex in the heavy-load case.
|
||||
* Each pass through the following loop works its way up
|
||||
* the rcu_node tree, returning if others have done the work or
|
||||
* otherwise falls through to acquire rsp->exp_mutex. The mapping
|
||||
* from CPU to rcu_node structure can be inexact, as it is just
|
||||
* promoting locality and is not strictly needed for correctness.
|
||||
*/
|
||||
rnp0 = rcu_get_root(rsp);
|
||||
if (!mutex_is_locked(&rnp0->exp_funnel_mutex)) {
|
||||
if (mutex_trylock(&rnp0->exp_funnel_mutex)) {
|
||||
if (sync_exp_work_done(rsp, rnp0, NULL,
|
||||
&rdp->expedited_workdone0, s))
|
||||
return NULL;
|
||||
return rnp0;
|
||||
}
|
||||
}
|
||||
for (; rnp != NULL; rnp = rnp->parent) {
|
||||
if (sync_exp_work_done(rsp, &rdp->exp_workdone1, s))
|
||||
return true;
|
||||
|
||||
/*
|
||||
* Each pass through the following loop works its way
|
||||
* up the rcu_node tree, returning if others have done the
|
||||
* work or otherwise falls through holding the root rnp's
|
||||
* ->exp_funnel_mutex. The mapping from CPU to rcu_node structure
|
||||
* can be inexact, as it is just promoting locality and is not
|
||||
* strictly needed for correctness.
|
||||
*/
|
||||
if (sync_exp_work_done(rsp, NULL, NULL, &rdp->expedited_workdone1, s))
|
||||
return NULL;
|
||||
mutex_lock(&rdp->exp_funnel_mutex);
|
||||
rnp0 = rdp->mynode;
|
||||
for (; rnp0 != NULL; rnp0 = rnp0->parent) {
|
||||
if (sync_exp_work_done(rsp, rnp1, rdp,
|
||||
&rdp->expedited_workdone2, s))
|
||||
return NULL;
|
||||
mutex_lock(&rnp0->exp_funnel_mutex);
|
||||
if (rnp1)
|
||||
mutex_unlock(&rnp1->exp_funnel_mutex);
|
||||
else
|
||||
mutex_unlock(&rdp->exp_funnel_mutex);
|
||||
rnp1 = rnp0;
|
||||
/* Work not done, either wait here or go up. */
|
||||
spin_lock(&rnp->exp_lock);
|
||||
if (ULONG_CMP_GE(rnp->exp_seq_rq, s)) {
|
||||
|
||||
/* Someone else doing GP, so wait for them. */
|
||||
spin_unlock(&rnp->exp_lock);
|
||||
trace_rcu_exp_funnel_lock(rsp->name, rnp->level,
|
||||
rnp->grplo, rnp->grphi,
|
||||
TPS("wait"));
|
||||
wait_event(rnp->exp_wq[(s >> 1) & 0x3],
|
||||
sync_exp_work_done(rsp,
|
||||
&rdp->exp_workdone2, s));
|
||||
return true;
|
||||
}
|
||||
if (sync_exp_work_done(rsp, rnp1, rdp,
|
||||
&rdp->expedited_workdone3, s))
|
||||
return NULL;
|
||||
return rnp1;
|
||||
rnp->exp_seq_rq = s; /* Followers can wait on us. */
|
||||
spin_unlock(&rnp->exp_lock);
|
||||
trace_rcu_exp_funnel_lock(rsp->name, rnp->level, rnp->grplo,
|
||||
rnp->grphi, TPS("nxtlvl"));
|
||||
}
|
||||
mutex_lock(&rsp->exp_mutex);
|
||||
fastpath:
|
||||
if (sync_exp_work_done(rsp, &rdp->exp_workdone3, s)) {
|
||||
mutex_unlock(&rsp->exp_mutex);
|
||||
return true;
|
||||
}
|
||||
rcu_exp_gp_seq_start(rsp);
|
||||
trace_rcu_exp_grace_period(rsp->name, s, TPS("start"));
|
||||
return false;
|
||||
}
|
||||
|
||||
/* Invoked on each online non-idle CPU for expedited quiescent state. */
|
||||
@ -3649,6 +3738,11 @@ static void sync_sched_exp_handler(void *data)
|
||||
if (!(READ_ONCE(rnp->expmask) & rdp->grpmask) ||
|
||||
__this_cpu_read(rcu_sched_data.cpu_no_qs.b.exp))
|
||||
return;
|
||||
if (rcu_is_cpu_rrupt_from_idle()) {
|
||||
rcu_report_exp_rdp(&rcu_sched_state,
|
||||
this_cpu_ptr(&rcu_sched_data), true);
|
||||
return;
|
||||
}
|
||||
__this_cpu_write(rcu_sched_data.cpu_no_qs.b.exp, true);
|
||||
resched_cpu(smp_processor_id());
|
||||
}
|
||||
@ -3773,7 +3867,7 @@ static void synchronize_sched_expedited_wait(struct rcu_state *rsp)
|
||||
rsp->name);
|
||||
ndetected = 0;
|
||||
rcu_for_each_leaf_node(rsp, rnp) {
|
||||
ndetected = rcu_print_task_exp_stall(rnp);
|
||||
ndetected += rcu_print_task_exp_stall(rnp);
|
||||
mask = 1;
|
||||
for (cpu = rnp->grplo; cpu <= rnp->grphi; cpu++, mask <<= 1) {
|
||||
struct rcu_data *rdp;
|
||||
@ -3783,7 +3877,7 @@ static void synchronize_sched_expedited_wait(struct rcu_state *rsp)
|
||||
ndetected++;
|
||||
rdp = per_cpu_ptr(rsp->rda, cpu);
|
||||
pr_cont(" %d-%c%c%c", cpu,
|
||||
"O."[cpu_online(cpu)],
|
||||
"O."[!!cpu_online(cpu)],
|
||||
"o."[!!(rdp->grpmask & rnp->expmaskinit)],
|
||||
"N."[!!(rdp->grpmask & rnp->expmaskinitnext)]);
|
||||
}
|
||||
@ -3792,7 +3886,7 @@ static void synchronize_sched_expedited_wait(struct rcu_state *rsp)
|
||||
pr_cont(" } %lu jiffies s: %lu root: %#lx/%c\n",
|
||||
jiffies - jiffies_start, rsp->expedited_sequence,
|
||||
rnp_root->expmask, ".T"[!!rnp_root->exp_tasks]);
|
||||
if (!ndetected) {
|
||||
if (ndetected) {
|
||||
pr_err("blocking rcu_node structures:");
|
||||
rcu_for_each_node_breadth_first(rsp, rnp) {
|
||||
if (rnp == rnp_root)
|
||||
@ -3818,6 +3912,41 @@ static void synchronize_sched_expedited_wait(struct rcu_state *rsp)
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Wait for the current expedited grace period to complete, and then
|
||||
* wake up everyone who piggybacked on the just-completed expedited
|
||||
* grace period. Also update all the ->exp_seq_rq counters as needed
|
||||
* in order to avoid counter-wrap problems.
|
||||
*/
|
||||
static void rcu_exp_wait_wake(struct rcu_state *rsp, unsigned long s)
|
||||
{
|
||||
struct rcu_node *rnp;
|
||||
|
||||
synchronize_sched_expedited_wait(rsp);
|
||||
rcu_exp_gp_seq_end(rsp);
|
||||
trace_rcu_exp_grace_period(rsp->name, s, TPS("end"));
|
||||
|
||||
/*
|
||||
* Switch over to wakeup mode, allowing the next GP, but -only- the
|
||||
* next GP, to proceed.
|
||||
*/
|
||||
mutex_lock(&rsp->exp_wake_mutex);
|
||||
mutex_unlock(&rsp->exp_mutex);
|
||||
|
||||
rcu_for_each_node_breadth_first(rsp, rnp) {
|
||||
if (ULONG_CMP_LT(READ_ONCE(rnp->exp_seq_rq), s)) {
|
||||
spin_lock(&rnp->exp_lock);
|
||||
/* Recheck, avoid hang in case someone just arrived. */
|
||||
if (ULONG_CMP_LT(rnp->exp_seq_rq, s))
|
||||
rnp->exp_seq_rq = s;
|
||||
spin_unlock(&rnp->exp_lock);
|
||||
}
|
||||
wake_up_all(&rnp->exp_wq[(rsp->expedited_sequence >> 1) & 0x3]);
|
||||
}
|
||||
trace_rcu_exp_grace_period(rsp->name, s, TPS("endwake"));
|
||||
mutex_unlock(&rsp->exp_wake_mutex);
|
||||
}
|
||||
|
||||
/**
|
||||
* synchronize_sched_expedited - Brute-force RCU-sched grace period
|
||||
*
|
||||
@ -3837,7 +3966,6 @@ static void synchronize_sched_expedited_wait(struct rcu_state *rsp)
|
||||
void synchronize_sched_expedited(void)
|
||||
{
|
||||
unsigned long s;
|
||||
struct rcu_node *rnp;
|
||||
struct rcu_state *rsp = &rcu_sched_state;
|
||||
|
||||
/* If only one CPU, this is automatically a grace period. */
|
||||
@ -3852,17 +3980,14 @@ void synchronize_sched_expedited(void)
|
||||
|
||||
/* Take a snapshot of the sequence number. */
|
||||
s = rcu_exp_gp_seq_snap(rsp);
|
||||
|
||||
rnp = exp_funnel_lock(rsp, s);
|
||||
if (rnp == NULL)
|
||||
if (exp_funnel_lock(rsp, s))
|
||||
return; /* Someone else did our work for us. */
|
||||
|
||||
rcu_exp_gp_seq_start(rsp);
|
||||
/* Initialize the rcu_node tree in preparation for the wait. */
|
||||
sync_rcu_exp_select_cpus(rsp, sync_sched_exp_handler);
|
||||
synchronize_sched_expedited_wait(rsp);
|
||||
|
||||
rcu_exp_gp_seq_end(rsp);
|
||||
mutex_unlock(&rnp->exp_funnel_mutex);
|
||||
/* Wait and clean up, including waking everyone. */
|
||||
rcu_exp_wait_wake(rsp, s);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(synchronize_sched_expedited);
|
||||
|
||||
@ -4162,7 +4287,6 @@ rcu_boot_init_percpu_data(int cpu, struct rcu_state *rsp)
|
||||
WARN_ON_ONCE(atomic_read(&rdp->dynticks->dynticks) != 1);
|
||||
rdp->cpu = cpu;
|
||||
rdp->rsp = rsp;
|
||||
mutex_init(&rdp->exp_funnel_mutex);
|
||||
rcu_boot_init_nocb_percpu_data(rdp);
|
||||
raw_spin_unlock_irqrestore_rcu_node(rnp, flags);
|
||||
}
|
||||
@ -4420,10 +4544,8 @@ static void __init rcu_init_one(struct rcu_state *rsp)
|
||||
{
|
||||
static const char * const buf[] = RCU_NODE_NAME_INIT;
|
||||
static const char * const fqs[] = RCU_FQS_NAME_INIT;
|
||||
static const char * const exp[] = RCU_EXP_NAME_INIT;
|
||||
static struct lock_class_key rcu_node_class[RCU_NUM_LVLS];
|
||||
static struct lock_class_key rcu_fqs_class[RCU_NUM_LVLS];
|
||||
static struct lock_class_key rcu_exp_class[RCU_NUM_LVLS];
|
||||
static u8 fl_mask = 0x1;
|
||||
|
||||
int levelcnt[RCU_NUM_LVLS]; /* # nodes in each level. */
|
||||
@ -4482,9 +4604,11 @@ static void __init rcu_init_one(struct rcu_state *rsp)
|
||||
rnp->level = i;
|
||||
INIT_LIST_HEAD(&rnp->blkd_tasks);
|
||||
rcu_init_one_nocb(rnp);
|
||||
mutex_init(&rnp->exp_funnel_mutex);
|
||||
lockdep_set_class_and_name(&rnp->exp_funnel_mutex,
|
||||
&rcu_exp_class[i], exp[i]);
|
||||
init_waitqueue_head(&rnp->exp_wq[0]);
|
||||
init_waitqueue_head(&rnp->exp_wq[1]);
|
||||
init_waitqueue_head(&rnp->exp_wq[2]);
|
||||
init_waitqueue_head(&rnp->exp_wq[3]);
|
||||
spin_lock_init(&rnp->exp_lock);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
@ -70,7 +70,6 @@
|
||||
# define NUM_RCU_LVL_INIT { NUM_RCU_LVL_0 }
|
||||
# define RCU_NODE_NAME_INIT { "rcu_node_0" }
|
||||
# define RCU_FQS_NAME_INIT { "rcu_node_fqs_0" }
|
||||
# define RCU_EXP_NAME_INIT { "rcu_node_exp_0" }
|
||||
#elif NR_CPUS <= RCU_FANOUT_2
|
||||
# define RCU_NUM_LVLS 2
|
||||
# define NUM_RCU_LVL_0 1
|
||||
@ -79,7 +78,6 @@
|
||||
# define NUM_RCU_LVL_INIT { NUM_RCU_LVL_0, NUM_RCU_LVL_1 }
|
||||
# define RCU_NODE_NAME_INIT { "rcu_node_0", "rcu_node_1" }
|
||||
# define RCU_FQS_NAME_INIT { "rcu_node_fqs_0", "rcu_node_fqs_1" }
|
||||
# define RCU_EXP_NAME_INIT { "rcu_node_exp_0", "rcu_node_exp_1" }
|
||||
#elif NR_CPUS <= RCU_FANOUT_3
|
||||
# define RCU_NUM_LVLS 3
|
||||
# define NUM_RCU_LVL_0 1
|
||||
@ -89,7 +87,6 @@
|
||||
# define NUM_RCU_LVL_INIT { NUM_RCU_LVL_0, NUM_RCU_LVL_1, NUM_RCU_LVL_2 }
|
||||
# define RCU_NODE_NAME_INIT { "rcu_node_0", "rcu_node_1", "rcu_node_2" }
|
||||
# define RCU_FQS_NAME_INIT { "rcu_node_fqs_0", "rcu_node_fqs_1", "rcu_node_fqs_2" }
|
||||
# define RCU_EXP_NAME_INIT { "rcu_node_exp_0", "rcu_node_exp_1", "rcu_node_exp_2" }
|
||||
#elif NR_CPUS <= RCU_FANOUT_4
|
||||
# define RCU_NUM_LVLS 4
|
||||
# define NUM_RCU_LVL_0 1
|
||||
@ -100,7 +97,6 @@
|
||||
# define NUM_RCU_LVL_INIT { NUM_RCU_LVL_0, NUM_RCU_LVL_1, NUM_RCU_LVL_2, NUM_RCU_LVL_3 }
|
||||
# define RCU_NODE_NAME_INIT { "rcu_node_0", "rcu_node_1", "rcu_node_2", "rcu_node_3" }
|
||||
# define RCU_FQS_NAME_INIT { "rcu_node_fqs_0", "rcu_node_fqs_1", "rcu_node_fqs_2", "rcu_node_fqs_3" }
|
||||
# define RCU_EXP_NAME_INIT { "rcu_node_exp_0", "rcu_node_exp_1", "rcu_node_exp_2", "rcu_node_exp_3" }
|
||||
#else
|
||||
# error "CONFIG_RCU_FANOUT insufficient for NR_CPUS"
|
||||
#endif /* #if (NR_CPUS) <= RCU_FANOUT_1 */
|
||||
@ -252,7 +248,9 @@ struct rcu_node {
|
||||
/* Counts of upcoming no-CB GP requests. */
|
||||
raw_spinlock_t fqslock ____cacheline_internodealigned_in_smp;
|
||||
|
||||
struct mutex exp_funnel_mutex ____cacheline_internodealigned_in_smp;
|
||||
spinlock_t exp_lock ____cacheline_internodealigned_in_smp;
|
||||
unsigned long exp_seq_rq;
|
||||
wait_queue_head_t exp_wq[4];
|
||||
} ____cacheline_internodealigned_in_smp;
|
||||
|
||||
/*
|
||||
@ -387,11 +385,9 @@ struct rcu_data {
|
||||
#ifdef CONFIG_RCU_FAST_NO_HZ
|
||||
struct rcu_head oom_head;
|
||||
#endif /* #ifdef CONFIG_RCU_FAST_NO_HZ */
|
||||
struct mutex exp_funnel_mutex;
|
||||
atomic_long_t expedited_workdone0; /* # done by others #0. */
|
||||
atomic_long_t expedited_workdone1; /* # done by others #1. */
|
||||
atomic_long_t expedited_workdone2; /* # done by others #2. */
|
||||
atomic_long_t expedited_workdone3; /* # done by others #3. */
|
||||
atomic_long_t exp_workdone1; /* # done by others #1. */
|
||||
atomic_long_t exp_workdone2; /* # done by others #2. */
|
||||
atomic_long_t exp_workdone3; /* # done by others #3. */
|
||||
|
||||
/* 7) Callback offloading. */
|
||||
#ifdef CONFIG_RCU_NOCB_CPU
|
||||
@ -505,6 +501,8 @@ struct rcu_state {
|
||||
/* _rcu_barrier(). */
|
||||
/* End of fields guarded by barrier_mutex. */
|
||||
|
||||
struct mutex exp_mutex; /* Serialize expedited GP. */
|
||||
struct mutex exp_wake_mutex; /* Serialize wakeup. */
|
||||
unsigned long expedited_sequence; /* Take a ticket. */
|
||||
atomic_long_t expedited_normal; /* # fallbacks to normal. */
|
||||
atomic_t expedited_need_qs; /* # CPUs left to check in. */
|
||||
@ -513,6 +511,8 @@ struct rcu_state {
|
||||
|
||||
unsigned long jiffies_force_qs; /* Time at which to invoke */
|
||||
/* force_quiescent_state(). */
|
||||
unsigned long jiffies_kick_kthreads; /* Time at which to kick */
|
||||
/* kthreads, if configured. */
|
||||
unsigned long n_force_qs; /* Number of calls to */
|
||||
/* force_quiescent_state(). */
|
||||
unsigned long n_force_qs_lh; /* ~Number of calls leaving */
|
||||
|
||||
@ -722,18 +722,22 @@ static void sync_rcu_exp_handler(void *info)
|
||||
* synchronize_rcu_expedited - Brute-force RCU grace period
|
||||
*
|
||||
* Wait for an RCU-preempt grace period, but expedite it. The basic
|
||||
* idea is to invoke synchronize_sched_expedited() to push all the tasks to
|
||||
* the ->blkd_tasks lists and wait for this list to drain. This consumes
|
||||
* significant time on all CPUs and is unfriendly to real-time workloads,
|
||||
* so is thus not recommended for any sort of common-case code.
|
||||
* In fact, if you are using synchronize_rcu_expedited() in a loop,
|
||||
* please restructure your code to batch your updates, and then Use a
|
||||
* single synchronize_rcu() instead.
|
||||
* idea is to IPI all non-idle non-nohz online CPUs. The IPI handler
|
||||
* checks whether the CPU is in an RCU-preempt critical section, and
|
||||
* if so, it sets a flag that causes the outermost rcu_read_unlock()
|
||||
* to report the quiescent state. On the other hand, if the CPU is
|
||||
* not in an RCU read-side critical section, the IPI handler reports
|
||||
* the quiescent state immediately.
|
||||
*
|
||||
* Although this is a greate improvement over previous expedited
|
||||
* implementations, it is still unfriendly to real-time workloads, so is
|
||||
* thus not recommended for any sort of common-case code. In fact, if
|
||||
* you are using synchronize_rcu_expedited() in a loop, please restructure
|
||||
* your code to batch your updates, and then Use a single synchronize_rcu()
|
||||
* instead.
|
||||
*/
|
||||
void synchronize_rcu_expedited(void)
|
||||
{
|
||||
struct rcu_node *rnp;
|
||||
struct rcu_node *rnp_unlock;
|
||||
struct rcu_state *rsp = rcu_state_p;
|
||||
unsigned long s;
|
||||
|
||||
@ -744,23 +748,14 @@ void synchronize_rcu_expedited(void)
|
||||
}
|
||||
|
||||
s = rcu_exp_gp_seq_snap(rsp);
|
||||
|
||||
rnp_unlock = exp_funnel_lock(rsp, s);
|
||||
if (rnp_unlock == NULL)
|
||||
if (exp_funnel_lock(rsp, s))
|
||||
return; /* Someone else did our work for us. */
|
||||
|
||||
rcu_exp_gp_seq_start(rsp);
|
||||
|
||||
/* Initialize the rcu_node tree in preparation for the wait. */
|
||||
sync_rcu_exp_select_cpus(rsp, sync_rcu_exp_handler);
|
||||
|
||||
/* Wait for snapshotted ->blkd_tasks lists to drain. */
|
||||
rnp = rcu_get_root(rsp);
|
||||
synchronize_sched_expedited_wait(rsp);
|
||||
|
||||
/* Clean up and exit. */
|
||||
rcu_exp_gp_seq_end(rsp);
|
||||
mutex_unlock(&rnp_unlock->exp_funnel_mutex);
|
||||
/* Wait for ->blkd_tasks lists to drain, then wake everyone up. */
|
||||
rcu_exp_wait_wake(rsp, s);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(synchronize_rcu_expedited);
|
||||
|
||||
|
||||
@ -185,17 +185,16 @@ static int show_rcuexp(struct seq_file *m, void *v)
|
||||
int cpu;
|
||||
struct rcu_state *rsp = (struct rcu_state *)m->private;
|
||||
struct rcu_data *rdp;
|
||||
unsigned long s0 = 0, s1 = 0, s2 = 0, s3 = 0;
|
||||
unsigned long s1 = 0, s2 = 0, s3 = 0;
|
||||
|
||||
for_each_possible_cpu(cpu) {
|
||||
rdp = per_cpu_ptr(rsp->rda, cpu);
|
||||
s0 += atomic_long_read(&rdp->expedited_workdone0);
|
||||
s1 += atomic_long_read(&rdp->expedited_workdone1);
|
||||
s2 += atomic_long_read(&rdp->expedited_workdone2);
|
||||
s3 += atomic_long_read(&rdp->expedited_workdone3);
|
||||
s1 += atomic_long_read(&rdp->exp_workdone1);
|
||||
s2 += atomic_long_read(&rdp->exp_workdone2);
|
||||
s3 += atomic_long_read(&rdp->exp_workdone3);
|
||||
}
|
||||
seq_printf(m, "s=%lu wd0=%lu wd1=%lu wd2=%lu wd3=%lu n=%lu enq=%d sc=%lu\n",
|
||||
rsp->expedited_sequence, s0, s1, s2, s3,
|
||||
seq_printf(m, "s=%lu wd1=%lu wd2=%lu wd3=%lu n=%lu enq=%d sc=%lu\n",
|
||||
rsp->expedited_sequence, s1, s2, s3,
|
||||
atomic_long_read(&rsp->expedited_normal),
|
||||
atomic_read(&rsp->expedited_need_qs),
|
||||
rsp->expedited_sequence / 2);
|
||||
|
||||
@ -67,7 +67,7 @@ static int rcu_normal_after_boot;
|
||||
module_param(rcu_normal_after_boot, int, 0);
|
||||
#endif /* #ifndef CONFIG_TINY_RCU */
|
||||
|
||||
#if defined(CONFIG_DEBUG_LOCK_ALLOC) && defined(CONFIG_PREEMPT_COUNT)
|
||||
#ifdef CONFIG_DEBUG_LOCK_ALLOC
|
||||
/**
|
||||
* rcu_read_lock_sched_held() - might we be in RCU-sched read-side critical section?
|
||||
*
|
||||
@ -111,7 +111,7 @@ int rcu_read_lock_sched_held(void)
|
||||
return 0;
|
||||
if (debug_locks)
|
||||
lockdep_opinion = lock_is_held(&rcu_sched_lock_map);
|
||||
return lockdep_opinion || preempt_count() != 0 || irqs_disabled();
|
||||
return lockdep_opinion || !preemptible();
|
||||
}
|
||||
EXPORT_SYMBOL(rcu_read_lock_sched_held);
|
||||
#endif
|
||||
|
||||
@ -451,6 +451,7 @@ static int torture_shutdown(void *arg)
|
||||
torture_shutdown_hook();
|
||||
else
|
||||
VERBOSE_TOROUT_STRING("No torture_shutdown_hook(), skipping.");
|
||||
ftrace_dump(DUMP_ALL);
|
||||
kernel_power_off(); /* Shut down the system. */
|
||||
return 0;
|
||||
}
|
||||
@ -602,8 +603,9 @@ bool torture_init_begin(char *ttype, bool v, int *runnable)
|
||||
{
|
||||
mutex_lock(&fullstop_mutex);
|
||||
if (torture_type != NULL) {
|
||||
pr_alert("torture_init_begin: refusing %s init: %s running",
|
||||
pr_alert("torture_init_begin: Refusing %s init: %s running.\n",
|
||||
ttype, torture_type);
|
||||
pr_alert("torture_init_begin: One torture test at a time!\n");
|
||||
mutex_unlock(&fullstop_mutex);
|
||||
return false;
|
||||
}
|
||||
|
||||
@ -1289,6 +1289,39 @@ config TORTURE_TEST
|
||||
tristate
|
||||
default n
|
||||
|
||||
config RCU_PERF_TEST
|
||||
tristate "performance tests for RCU"
|
||||
depends on DEBUG_KERNEL
|
||||
select TORTURE_TEST
|
||||
select SRCU
|
||||
select TASKS_RCU
|
||||
default n
|
||||
help
|
||||
This option provides a kernel module that runs performance
|
||||
tests on the RCU infrastructure. The kernel module may be built
|
||||
after the fact on the running kernel to be tested, if desired.
|
||||
|
||||
Say Y here if you want RCU performance tests to be built into
|
||||
the kernel.
|
||||
Say M if you want the RCU performance tests to build as a module.
|
||||
Say N if you are unsure.
|
||||
|
||||
config RCU_PERF_TEST_RUNNABLE
|
||||
bool "performance tests for RCU runnable by default"
|
||||
depends on RCU_PERF_TEST = y
|
||||
default n
|
||||
help
|
||||
This option provides a way to build the RCU performance tests
|
||||
directly into the kernel without them starting up at boot time.
|
||||
You can use /sys/module to manually override this setting.
|
||||
This /proc file is available only when the RCU performance
|
||||
tests have been built into the kernel.
|
||||
|
||||
Say Y here if you want the RCU performance tests to start during
|
||||
boot (you probably don't).
|
||||
Say N here if you want the RCU performance tests to start only
|
||||
after being manually enabled via /sys/module.
|
||||
|
||||
config RCU_TORTURE_TEST
|
||||
tristate "torture tests for RCU"
|
||||
depends on DEBUG_KERNEL
|
||||
|
||||
90
tools/testing/selftests/rcutorture/bin/jitter.sh
Executable file
90
tools/testing/selftests/rcutorture/bin/jitter.sh
Executable file
@ -0,0 +1,90 @@
|
||||
#!/bin/bash
|
||||
#
|
||||
# Alternate sleeping and spinning on randomly selected CPUs. The purpose
|
||||
# of this script is to inflict random OS jitter on a concurrently running
|
||||
# test.
|
||||
#
|
||||
# Usage: jitter.sh me duration [ sleepmax [ spinmax ] ]
|
||||
#
|
||||
# me: Random-number-generator seed salt.
|
||||
# duration: Time to run in seconds.
|
||||
# sleepmax: Maximum microseconds to sleep, defaults to one second.
|
||||
# spinmax: Maximum microseconds to spin, defaults to one millisecond.
|
||||
#
|
||||
# This program is free software; you can redistribute it and/or modify
|
||||
# it under the terms of the GNU General Public License as published by
|
||||
# the Free Software Foundation; either version 2 of the License, or
|
||||
# (at your option) any later version.
|
||||
#
|
||||
# This program is distributed in the hope that it will be useful,
|
||||
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
# GNU General Public License for more details.
|
||||
#
|
||||
# You should have received a copy of the GNU General Public License
|
||||
# along with this program; if not, you can access it online at
|
||||
# http://www.gnu.org/licenses/gpl-2.0.html.
|
||||
#
|
||||
# Copyright (C) IBM Corporation, 2016
|
||||
#
|
||||
# Authors: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
|
||||
|
||||
me=$(($1 * 1000))
|
||||
duration=$2
|
||||
sleepmax=${3-1000000}
|
||||
spinmax=${4-1000}
|
||||
|
||||
n=1
|
||||
|
||||
starttime=`awk 'BEGIN { print systime(); }' < /dev/null`
|
||||
|
||||
while :
|
||||
do
|
||||
# Check for done.
|
||||
t=`awk -v s=$starttime 'BEGIN { print systime() - s; }' < /dev/null`
|
||||
if test "$t" -gt "$duration"
|
||||
then
|
||||
exit 0;
|
||||
fi
|
||||
|
||||
# Set affinity to randomly selected CPU
|
||||
cpus=`ls /sys/devices/system/cpu/*/online |
|
||||
sed -e 's,/[^/]*$,,' -e 's/^[^0-9]*//' |
|
||||
grep -v '^0*$'`
|
||||
cpumask=`awk -v cpus="$cpus" -v me=$me -v n=$n 'BEGIN {
|
||||
srand(n + me + systime());
|
||||
ncpus = split(cpus, ca);
|
||||
curcpu = ca[int(rand() * ncpus + 1)];
|
||||
mask = lshift(1, curcpu);
|
||||
if (mask + 0 <= 0)
|
||||
mask = 1;
|
||||
printf("%#x\n", mask);
|
||||
}' < /dev/null`
|
||||
n=$(($n+1))
|
||||
if ! taskset -p $cpumask $$ > /dev/null 2>&1
|
||||
then
|
||||
echo taskset failure: '"taskset -p ' $cpumask $$ '"'
|
||||
exit 1
|
||||
fi
|
||||
|
||||
# Sleep a random duration
|
||||
sleeptime=`awk -v me=$me -v n=$n -v sleepmax=$sleepmax 'BEGIN {
|
||||
srand(n + me + systime());
|
||||
printf("%06d", int(rand() * sleepmax));
|
||||
}' < /dev/null`
|
||||
n=$(($n+1))
|
||||
sleep .$sleeptime
|
||||
|
||||
# Spin a random duration
|
||||
limit=`awk -v me=$me -v n=$n -v spinmax=$spinmax 'BEGIN {
|
||||
srand(n + me + systime());
|
||||
printf("%06d", int(rand() * spinmax));
|
||||
}' < /dev/null`
|
||||
n=$(($n+1))
|
||||
for i in {1..$limit}
|
||||
do
|
||||
echo > /dev/null
|
||||
done
|
||||
done
|
||||
|
||||
exit 1
|
||||
121
tools/testing/selftests/rcutorture/bin/kvm-recheck-rcuperf-ftrace.sh
Executable file
121
tools/testing/selftests/rcutorture/bin/kvm-recheck-rcuperf-ftrace.sh
Executable file
@ -0,0 +1,121 @@
|
||||
#!/bin/bash
|
||||
#
|
||||
# Analyze a given results directory for rcuperf performance measurements,
|
||||
# looking for ftrace data. Exits with 0 if data was found, analyzed, and
|
||||
# printed. Intended to be invoked from kvm-recheck-rcuperf.sh after
|
||||
# argument checking.
|
||||
#
|
||||
# Usage: kvm-recheck-rcuperf-ftrace.sh resdir
|
||||
#
|
||||
# This program is free software; you can redistribute it and/or modify
|
||||
# it under the terms of the GNU General Public License as published by
|
||||
# the Free Software Foundation; either version 2 of the License, or
|
||||
# (at your option) any later version.
|
||||
#
|
||||
# This program is distributed in the hope that it will be useful,
|
||||
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
# GNU General Public License for more details.
|
||||
#
|
||||
# You should have received a copy of the GNU General Public License
|
||||
# along with this program; if not, you can access it online at
|
||||
# http://www.gnu.org/licenses/gpl-2.0.html.
|
||||
#
|
||||
# Copyright (C) IBM Corporation, 2016
|
||||
#
|
||||
# Authors: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
|
||||
|
||||
i="$1"
|
||||
. tools/testing/selftests/rcutorture/bin/functions.sh
|
||||
|
||||
if test "`grep -c 'rcu_exp_grace_period.*start' < $i/console.log`" -lt 100
|
||||
then
|
||||
exit 10
|
||||
fi
|
||||
|
||||
sed -e 's/^\[[^]]*]//' < $i/console.log |
|
||||
grep 'us : rcu_exp_grace_period' |
|
||||
sed -e 's/us : / : /' |
|
||||
tr -d '\015' |
|
||||
awk '
|
||||
$8 == "start" {
|
||||
if (starttask != "")
|
||||
nlost++;
|
||||
starttask = $1;
|
||||
starttime = $3;
|
||||
startseq = $7;
|
||||
}
|
||||
|
||||
$8 == "end" {
|
||||
if (starttask == $1 && startseq == $7) {
|
||||
curgpdur = $3 - starttime;
|
||||
gptimes[++n] = curgpdur;
|
||||
gptaskcnt[starttask]++;
|
||||
sum += curgpdur;
|
||||
if (curgpdur > 1000)
|
||||
print "Long GP " starttime "us to " $3 "us (" curgpdur "us)";
|
||||
starttask = "";
|
||||
} else {
|
||||
# Lost a message or some such, reset.
|
||||
starttask = "";
|
||||
nlost++;
|
||||
}
|
||||
}
|
||||
|
||||
$8 == "done" {
|
||||
piggybackcnt[$1]++;
|
||||
}
|
||||
|
||||
END {
|
||||
newNR = asort(gptimes);
|
||||
if (newNR <= 0) {
|
||||
print "No ftrace records found???"
|
||||
exit 10;
|
||||
}
|
||||
pct50 = int(newNR * 50 / 100);
|
||||
if (pct50 < 1)
|
||||
pct50 = 1;
|
||||
pct90 = int(newNR * 90 / 100);
|
||||
if (pct90 < 1)
|
||||
pct90 = 1;
|
||||
pct99 = int(newNR * 99 / 100);
|
||||
if (pct99 < 1)
|
||||
pct99 = 1;
|
||||
div = 10 ** int(log(gptimes[pct90]) / log(10) + .5) / 100;
|
||||
print "Histogram bucket size: " div;
|
||||
last = gptimes[1] - 10;
|
||||
count = 0;
|
||||
for (i = 1; i <= newNR; i++) {
|
||||
current = div * int(gptimes[i] / div);
|
||||
if (last == current) {
|
||||
count++;
|
||||
} else {
|
||||
if (count > 0)
|
||||
print last, count;
|
||||
count = 1;
|
||||
last = current;
|
||||
}
|
||||
}
|
||||
if (count > 0)
|
||||
print last, count;
|
||||
print "Distribution of grace periods across tasks:";
|
||||
for (i in gptaskcnt) {
|
||||
print "\t" i, gptaskcnt[i];
|
||||
nbatches += gptaskcnt[i];
|
||||
}
|
||||
ngps = nbatches;
|
||||
print "Distribution of piggybacking across tasks:";
|
||||
for (i in piggybackcnt) {
|
||||
print "\t" i, piggybackcnt[i];
|
||||
ngps += piggybackcnt[i];
|
||||
}
|
||||
print "Average grace-period duration: " sum / newNR " microseconds";
|
||||
print "Minimum grace-period duration: " gptimes[1];
|
||||
print "50th percentile grace-period duration: " gptimes[pct50];
|
||||
print "90th percentile grace-period duration: " gptimes[pct90];
|
||||
print "99th percentile grace-period duration: " gptimes[pct99];
|
||||
print "Maximum grace-period duration: " gptimes[newNR];
|
||||
print "Grace periods: " ngps + 0 " Batches: " nbatches + 0 " Ratio: " ngps / nbatches " Lost: " nlost + 0;
|
||||
print "Computed from ftrace data.";
|
||||
}'
|
||||
exit 0
|
||||
96
tools/testing/selftests/rcutorture/bin/kvm-recheck-rcuperf.sh
Executable file
96
tools/testing/selftests/rcutorture/bin/kvm-recheck-rcuperf.sh
Executable file
@ -0,0 +1,96 @@
|
||||
#!/bin/bash
|
||||
#
|
||||
# Analyze a given results directory for rcuperf performance measurements.
|
||||
#
|
||||
# Usage: kvm-recheck-rcuperf.sh resdir
|
||||
#
|
||||
# This program is free software; you can redistribute it and/or modify
|
||||
# it under the terms of the GNU General Public License as published by
|
||||
# the Free Software Foundation; either version 2 of the License, or
|
||||
# (at your option) any later version.
|
||||
#
|
||||
# This program is distributed in the hope that it will be useful,
|
||||
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
# GNU General Public License for more details.
|
||||
#
|
||||
# You should have received a copy of the GNU General Public License
|
||||
# along with this program; if not, you can access it online at
|
||||
# http://www.gnu.org/licenses/gpl-2.0.html.
|
||||
#
|
||||
# Copyright (C) IBM Corporation, 2016
|
||||
#
|
||||
# Authors: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
|
||||
|
||||
i="$1"
|
||||
if test -d $i
|
||||
then
|
||||
:
|
||||
else
|
||||
echo Unreadable results directory: $i
|
||||
exit 1
|
||||
fi
|
||||
PATH=`pwd`/tools/testing/selftests/rcutorture/bin:$PATH; export PATH
|
||||
. tools/testing/selftests/rcutorture/bin/functions.sh
|
||||
|
||||
if kvm-recheck-rcuperf-ftrace.sh $i
|
||||
then
|
||||
# ftrace data was successfully analyzed, call it good!
|
||||
exit 0
|
||||
fi
|
||||
|
||||
configfile=`echo $i | sed -e 's/^.*\///'`
|
||||
|
||||
sed -e 's/^\[[^]]*]//' < $i/console.log |
|
||||
awk '
|
||||
/-perf: .* gps: .* batches:/ {
|
||||
ngps = $9;
|
||||
nbatches = $11;
|
||||
}
|
||||
|
||||
/-perf: .*writer-duration/ {
|
||||
gptimes[++n] = $5 / 1000.;
|
||||
sum += $5 / 1000.;
|
||||
}
|
||||
|
||||
END {
|
||||
newNR = asort(gptimes);
|
||||
if (newNR <= 0) {
|
||||
print "No rcuperf records found???"
|
||||
exit;
|
||||
}
|
||||
pct50 = int(newNR * 50 / 100);
|
||||
if (pct50 < 1)
|
||||
pct50 = 1;
|
||||
pct90 = int(newNR * 90 / 100);
|
||||
if (pct90 < 1)
|
||||
pct90 = 1;
|
||||
pct99 = int(newNR * 99 / 100);
|
||||
if (pct99 < 1)
|
||||
pct99 = 1;
|
||||
div = 10 ** int(log(gptimes[pct90]) / log(10) + .5) / 100;
|
||||
print "Histogram bucket size: " div;
|
||||
last = gptimes[1] - 10;
|
||||
count = 0;
|
||||
for (i = 1; i <= newNR; i++) {
|
||||
current = div * int(gptimes[i] / div);
|
||||
if (last == current) {
|
||||
count++;
|
||||
} else {
|
||||
if (count > 0)
|
||||
print last, count;
|
||||
count = 1;
|
||||
last = current;
|
||||
}
|
||||
}
|
||||
if (count > 0)
|
||||
print last, count;
|
||||
print "Average grace-period duration: " sum / newNR " microseconds";
|
||||
print "Minimum grace-period duration: " gptimes[1];
|
||||
print "50th percentile grace-period duration: " gptimes[pct50];
|
||||
print "90th percentile grace-period duration: " gptimes[pct90];
|
||||
print "99th percentile grace-period duration: " gptimes[pct99];
|
||||
print "Maximum grace-period duration: " gptimes[newNR];
|
||||
print "Grace periods: " ngps + 0 " Batches: " nbatches + 0 " Ratio: " ngps / nbatches;
|
||||
print "Computed from rcuperf printk output.";
|
||||
}'
|
||||
@ -48,7 +48,10 @@ do
|
||||
cat $i/Make.oldconfig.err
|
||||
fi
|
||||
parse-build.sh $i/Make.out $configfile
|
||||
if test "$TORTURE_SUITE" != rcuperf
|
||||
then
|
||||
parse-torture.sh $i/console.log $configfile
|
||||
fi
|
||||
parse-console.sh $i/console.log $configfile
|
||||
if test -r $i/Warnings
|
||||
then
|
||||
|
||||
@ -6,7 +6,7 @@
|
||||
# Execute this in the source tree. Do not run it as a background task
|
||||
# because qemu does not seem to like that much.
|
||||
#
|
||||
# Usage: kvm-test-1-run.sh config builddir resdir minutes qemu-args boot_args
|
||||
# Usage: kvm-test-1-run.sh config builddir resdir seconds qemu-args boot_args
|
||||
#
|
||||
# qemu-args defaults to "-enable-kvm -soundhw pcspk -nographic", along with
|
||||
# arguments specifying the number of CPUs and other
|
||||
@ -91,25 +91,33 @@ fi
|
||||
# CONFIG_PCMCIA=n
|
||||
# CONFIG_CARDBUS=n
|
||||
# CONFIG_YENTA=n
|
||||
if kvm-build.sh $config_template $builddir $T
|
||||
base_resdir=`echo $resdir | sed -e 's/\.[0-9]\+$//'`
|
||||
if test "$base_resdir" != "$resdir" -a -f $base_resdir/bzImage -a -f $base_resdir/vmlinux
|
||||
then
|
||||
# Rerunning previous test, so use that test's kernel.
|
||||
QEMU="`identify_qemu $base_resdir/vmlinux`"
|
||||
KERNEL=$base_resdir/bzImage
|
||||
ln -s $base_resdir/Make*.out $resdir # for kvm-recheck.sh
|
||||
ln -s $base_resdir/.config $resdir # for kvm-recheck.sh
|
||||
elif kvm-build.sh $config_template $builddir $T
|
||||
then
|
||||
# Had to build a kernel for this test.
|
||||
QEMU="`identify_qemu $builddir/vmlinux`"
|
||||
BOOT_IMAGE="`identify_boot_image $QEMU`"
|
||||
cp $builddir/Make*.out $resdir
|
||||
cp $builddir/vmlinux $resdir
|
||||
cp $builddir/.config $resdir
|
||||
if test -n "$BOOT_IMAGE"
|
||||
then
|
||||
cp $builddir/$BOOT_IMAGE $resdir
|
||||
KERNEL=$resdir/bzImage
|
||||
else
|
||||
echo No identifiable boot image, not running KVM, see $resdir.
|
||||
echo Do the torture scripts know about your architecture?
|
||||
fi
|
||||
parse-build.sh $resdir/Make.out $title
|
||||
if test -f $builddir.wait
|
||||
then
|
||||
mv $builddir.wait $builddir.ready
|
||||
fi
|
||||
else
|
||||
# Build failed.
|
||||
cp $builddir/Make*.out $resdir
|
||||
cp $builddir/.config $resdir || :
|
||||
echo Build failed, not running KVM, see $resdir.
|
||||
@ -119,12 +127,15 @@ else
|
||||
fi
|
||||
exit 1
|
||||
fi
|
||||
if test -f $builddir.wait
|
||||
then
|
||||
mv $builddir.wait $builddir.ready
|
||||
fi
|
||||
while test -f $builddir.ready
|
||||
do
|
||||
sleep 1
|
||||
done
|
||||
minutes=$4
|
||||
seconds=$(($minutes * 60))
|
||||
seconds=$4
|
||||
qemu_args=$5
|
||||
boot_args=$6
|
||||
|
||||
@ -167,15 +178,26 @@ then
|
||||
exit 0
|
||||
fi
|
||||
echo "NOTE: $QEMU either did not run or was interactive" > $resdir/console.log
|
||||
echo $QEMU $qemu_args -m 512 -kernel $resdir/bzImage -append \"$qemu_append $boot_args\" > $resdir/qemu-cmd
|
||||
( $QEMU $qemu_args -m 512 -kernel $resdir/bzImage -append "$qemu_append $boot_args"; echo $? > $resdir/qemu-retval ) &
|
||||
qemu_pid=$!
|
||||
echo $QEMU $qemu_args -m 512 -kernel $KERNEL -append \"$qemu_append $boot_args\" > $resdir/qemu-cmd
|
||||
( $QEMU $qemu_args -m 512 -kernel $KERNEL -append "$qemu_append $boot_args"& echo $! > $resdir/qemu_pid; wait `cat $resdir/qemu_pid`; echo $? > $resdir/qemu-retval ) &
|
||||
commandcompleted=0
|
||||
sleep 10 # Give qemu's pid a chance to reach the file
|
||||
if test -s "$resdir/qemu_pid"
|
||||
then
|
||||
qemu_pid=`cat "$resdir/qemu_pid"`
|
||||
echo Monitoring qemu job at pid $qemu_pid
|
||||
else
|
||||
qemu_pid=""
|
||||
echo Monitoring qemu job at yet-as-unknown pid
|
||||
fi
|
||||
while :
|
||||
do
|
||||
if test -z "$qemu_pid" -a -s "$resdir/qemu_pid"
|
||||
then
|
||||
qemu_pid=`cat "$resdir/qemu_pid"`
|
||||
fi
|
||||
kruntime=`awk 'BEGIN { print systime() - '"$kstarttime"' }' < /dev/null`
|
||||
if kill -0 $qemu_pid > /dev/null 2>&1
|
||||
if test -z "$qemu_pid" || kill -0 "$qemu_pid" > /dev/null 2>&1
|
||||
then
|
||||
if test $kruntime -ge $seconds
|
||||
then
|
||||
@ -195,12 +217,16 @@ do
|
||||
ps -fp $killpid >> $resdir/Warnings 2>&1
|
||||
fi
|
||||
else
|
||||
echo ' ---' `date`: Kernel done
|
||||
echo ' ---' `date`: "Kernel done"
|
||||
fi
|
||||
break
|
||||
fi
|
||||
done
|
||||
if test $commandcompleted -eq 0
|
||||
if test -z "$qemu_pid" -a -s "$resdir/qemu_pid"
|
||||
then
|
||||
qemu_pid=`cat "$resdir/qemu_pid"`
|
||||
fi
|
||||
if test $commandcompleted -eq 0 -a -n "$qemu_pid"
|
||||
then
|
||||
echo Grace period for qemu job at pid $qemu_pid
|
||||
while :
|
||||
@ -220,6 +246,9 @@ then
|
||||
fi
|
||||
sleep 1
|
||||
done
|
||||
elif test -z "$qemu_pid"
|
||||
then
|
||||
echo Unknown PID, cannot kill qemu command
|
||||
fi
|
||||
|
||||
parse-torture.sh $resdir/console.log $title
|
||||
|
||||
@ -34,7 +34,7 @@ T=/tmp/kvm.sh.$$
|
||||
trap 'rm -rf $T' 0
|
||||
mkdir $T
|
||||
|
||||
dur=30
|
||||
dur=$((30*60))
|
||||
dryrun=""
|
||||
KVM="`pwd`/tools/testing/selftests/rcutorture"; export KVM
|
||||
PATH=${KVM}/bin:$PATH; export PATH
|
||||
@ -48,6 +48,7 @@ resdir=""
|
||||
configs=""
|
||||
cpus=0
|
||||
ds=`date +%Y.%m.%d-%H:%M:%S`
|
||||
jitter=0
|
||||
|
||||
. functions.sh
|
||||
|
||||
@ -63,6 +64,7 @@ usage () {
|
||||
echo " --dryrun sched|script"
|
||||
echo " --duration minutes"
|
||||
echo " --interactive"
|
||||
echo " --jitter N [ maxsleep (us) [ maxspin (us) ] ]"
|
||||
echo " --kmake-arg kernel-make-arguments"
|
||||
echo " --mac nn:nn:nn:nn:nn:nn"
|
||||
echo " --no-initrd"
|
||||
@ -116,12 +118,17 @@ do
|
||||
;;
|
||||
--duration)
|
||||
checkarg --duration "(minutes)" $# "$2" '^[0-9]*$' '^error'
|
||||
dur=$2
|
||||
dur=$(($2*60))
|
||||
shift
|
||||
;;
|
||||
--interactive)
|
||||
TORTURE_QEMU_INTERACTIVE=1; export TORTURE_QEMU_INTERACTIVE
|
||||
;;
|
||||
--jitter)
|
||||
checkarg --jitter "(# threads [ sleep [ spin ] ])" $# "$2" '^-\{,1\}[0-9]\+\( \+[0-9]\+\)\{,2\} *$' '^error$'
|
||||
jitter="$2"
|
||||
shift
|
||||
;;
|
||||
--kmake-arg)
|
||||
checkarg --kmake-arg "(kernel make arguments)" $# "$2" '.*' '^error$'
|
||||
TORTURE_KMAKE_ARG="$2"
|
||||
@ -156,7 +163,7 @@ do
|
||||
shift
|
||||
;;
|
||||
--torture)
|
||||
checkarg --torture "(suite name)" "$#" "$2" '^\(lock\|rcu\)$' '^--'
|
||||
checkarg --torture "(suite name)" "$#" "$2" '^\(lock\|rcu\|rcuperf\)$' '^--'
|
||||
TORTURE_SUITE=$2
|
||||
shift
|
||||
;;
|
||||
@ -299,6 +306,7 @@ awk < $T/cfgcpu.pack \
|
||||
-v CONFIGDIR="$CONFIGFRAG/" \
|
||||
-v KVM="$KVM" \
|
||||
-v ncpus=$cpus \
|
||||
-v jitter="$jitter" \
|
||||
-v rd=$resdir/$ds/ \
|
||||
-v dur=$dur \
|
||||
-v TORTURE_QEMU_ARG="$TORTURE_QEMU_ARG" \
|
||||
@ -359,6 +367,16 @@ function dump(first, pastlast, batchnum)
|
||||
print "\techo ----", cfr[j], cpusr[j] ovf ": Starting kernel. `date` >> " rd "/log";
|
||||
print "fi"
|
||||
}
|
||||
njitter = 0;
|
||||
split(jitter, ja);
|
||||
if (ja[1] == -1 && ncpus == 0)
|
||||
njitter = 1;
|
||||
else if (ja[1] == -1)
|
||||
njitter = ncpus;
|
||||
else
|
||||
njitter = ja[1];
|
||||
for (j = 0; j < njitter; j++)
|
||||
print "jitter.sh " j " " dur " " ja[2] " " ja[3] "&"
|
||||
print "wait"
|
||||
print "if test -z \"$TORTURE_BUILDONLY\""
|
||||
print "then"
|
||||
|
||||
@ -14,7 +14,7 @@ CONFIG_HOTPLUG_CPU=n
|
||||
CONFIG_SUSPEND=n
|
||||
CONFIG_HIBERNATION=n
|
||||
CONFIG_RCU_FANOUT=4
|
||||
CONFIG_RCU_FANOUT_LEAF=4
|
||||
CONFIG_RCU_FANOUT_LEAF=3
|
||||
CONFIG_RCU_NOCB_CPU=n
|
||||
CONFIG_DEBUG_LOCK_ALLOC=n
|
||||
CONFIG_DEBUG_OBJECTS_RCU_HEAD=n
|
||||
|
||||
@ -1 +1 @@
|
||||
rcutorture.torture_type=rcu_bh
|
||||
rcutorture.torture_type=rcu_bh rcutree.rcu_fanout_leaf=4
|
||||
|
||||
@ -0,0 +1 @@
|
||||
TREE
|
||||
@ -0,0 +1,2 @@
|
||||
CONFIG_RCU_PERF_TEST=y
|
||||
CONFIG_PRINTK_TIME=y
|
||||
20
tools/testing/selftests/rcutorture/configs/rcuperf/TREE
Normal file
20
tools/testing/selftests/rcutorture/configs/rcuperf/TREE
Normal file
@ -0,0 +1,20 @@
|
||||
CONFIG_SMP=y
|
||||
CONFIG_PREEMPT_NONE=n
|
||||
CONFIG_PREEMPT_VOLUNTARY=n
|
||||
CONFIG_PREEMPT=y
|
||||
#CHECK#CONFIG_PREEMPT_RCU=y
|
||||
CONFIG_HZ_PERIODIC=n
|
||||
CONFIG_NO_HZ_IDLE=y
|
||||
CONFIG_NO_HZ_FULL=n
|
||||
CONFIG_RCU_FAST_NO_HZ=n
|
||||
CONFIG_RCU_TRACE=n
|
||||
CONFIG_HOTPLUG_CPU=n
|
||||
CONFIG_SUSPEND=n
|
||||
CONFIG_HIBERNATION=n
|
||||
CONFIG_RCU_NOCB_CPU=n
|
||||
CONFIG_DEBUG_LOCK_ALLOC=n
|
||||
CONFIG_PROVE_LOCKING=n
|
||||
CONFIG_RCU_BOOST=n
|
||||
CONFIG_DEBUG_OBJECTS_RCU_HEAD=n
|
||||
CONFIG_RCU_EXPERT=y
|
||||
CONFIG_RCU_TRACE=y
|
||||
23
tools/testing/selftests/rcutorture/configs/rcuperf/TREE54
Normal file
23
tools/testing/selftests/rcutorture/configs/rcuperf/TREE54
Normal file
@ -0,0 +1,23 @@
|
||||
CONFIG_SMP=y
|
||||
CONFIG_NR_CPUS=54
|
||||
CONFIG_PREEMPT_NONE=n
|
||||
CONFIG_PREEMPT_VOLUNTARY=n
|
||||
CONFIG_PREEMPT=y
|
||||
#CHECK#CONFIG_PREEMPT_RCU=y
|
||||
CONFIG_HZ_PERIODIC=n
|
||||
CONFIG_NO_HZ_IDLE=y
|
||||
CONFIG_NO_HZ_FULL=n
|
||||
CONFIG_RCU_FAST_NO_HZ=n
|
||||
CONFIG_RCU_TRACE=n
|
||||
CONFIG_HOTPLUG_CPU=n
|
||||
CONFIG_SUSPEND=n
|
||||
CONFIG_HIBERNATION=n
|
||||
CONFIG_RCU_FANOUT=3
|
||||
CONFIG_RCU_FANOUT_LEAF=2
|
||||
CONFIG_RCU_NOCB_CPU=n
|
||||
CONFIG_DEBUG_LOCK_ALLOC=n
|
||||
CONFIG_PROVE_LOCKING=n
|
||||
CONFIG_RCU_BOOST=n
|
||||
CONFIG_DEBUG_OBJECTS_RCU_HEAD=n
|
||||
CONFIG_RCU_EXPERT=y
|
||||
CONFIG_RCU_TRACE=y
|
||||
@ -0,0 +1,52 @@
|
||||
#!/bin/bash
|
||||
#
|
||||
# Torture-suite-dependent shell functions for the rest of the scripts.
|
||||
#
|
||||
# This program is free software; you can redistribute it and/or modify
|
||||
# it under the terms of the GNU General Public License as published by
|
||||
# the Free Software Foundation; either version 2 of the License, or
|
||||
# (at your option) any later version.
|
||||
#
|
||||
# This program is distributed in the hope that it will be useful,
|
||||
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
# GNU General Public License for more details.
|
||||
#
|
||||
# You should have received a copy of the GNU General Public License
|
||||
# along with this program; if not, you can access it online at
|
||||
# http://www.gnu.org/licenses/gpl-2.0.html.
|
||||
#
|
||||
# Copyright (C) IBM Corporation, 2015
|
||||
#
|
||||
# Authors: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
|
||||
|
||||
# rcuperf_param_nreaders bootparam-string
|
||||
#
|
||||
# Adds nreaders rcuperf module parameter if not already specified.
|
||||
rcuperf_param_nreaders () {
|
||||
if ! echo "$1" | grep -q "rcuperf.nreaders"
|
||||
then
|
||||
echo rcuperf.nreaders=-1
|
||||
fi
|
||||
}
|
||||
|
||||
# rcuperf_param_nwriters bootparam-string
|
||||
#
|
||||
# Adds nwriters rcuperf module parameter if not already specified.
|
||||
rcuperf_param_nwriters () {
|
||||
if ! echo "$1" | grep -q "rcuperf.nwriters"
|
||||
then
|
||||
echo rcuperf.nwriters=-1
|
||||
fi
|
||||
}
|
||||
|
||||
# per_version_boot_params bootparam-string config-file seconds
|
||||
#
|
||||
# Adds per-version torture-module parameters to kernels supporting them.
|
||||
per_version_boot_params () {
|
||||
echo $1 `rcuperf_param_nreaders "$1"` \
|
||||
`rcuperf_param_nwriters "$1"` \
|
||||
rcuperf.perf_runnable=1 \
|
||||
rcuperf.shutdown=1 \
|
||||
rcuperf.verbose=1
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user