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Eric Dumazet 1c69d921ed [PATCH] rcu: add a prefetch() in rcu_do_batch() 
On some workloads, (for example when lot of close() syscalls are done), RCU
qlen can be quite large, and RCU heads are no longer in cpu cache when
rcu_do_batch() is called.

This patch adds a prefetch() in rcu_do_batch() to give CPU a hint to bring
back cache lines containing 'struct rcu_head's.

Most list manipulations macros include prefetch(), but not open coded ones
(at least with current C compilers :) )

I got a nice speedup on a trivial benchmark (3.48 us per iteration instead
of 3.95 us on a 1.6 GHz Pentium-M)

while (1) { pipe(p); close(fd[0]); close(fd[1]);}

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Cc: "Paul E. McKenney" <paulmck@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-07 08:39:40 -08:00
..
irq
[PATCH] lockdep: name some old style locks
2006-12-07 08:39:36 -08:00
power
[PATCH] Export pm_suspend for the shared APM emulation
2006-12-07 08:39:32 -08:00
time
[PATCH] time_adjust cleared before use
2006-10-28 11:30:55 -07:00
.gitignore
gitignore: ignore more generated files
2006-01-03 11:35:26 +01:00
acct.c
[PATCH] lockdep: name some old style locks
2006-12-07 08:39:36 -08:00
audit.c
[PATCH] Add include/linux/freezer.h and move definitions from sched.h
2006-12-07 08:39:27 -08:00
audit.h
[PATCH] audit: AUDIT_PERM support
2006-09-11 13:32:30 -04:00
auditfilter.c
[PATCH] arch filter lists with < or > should not be accepted
2006-10-04 08:31:16 -04:00
auditsc.c
[PATCH] severing skbuff.h -> highmem.h
2006-12-04 02:00:29 -05:00
capability.c
[PATCH] pidspace: is_init()
2006-09-29 09:18:12 -07:00
compat.c
[PATCH] Create compat_sys_migrate_pages
2006-11-03 12:27:59 -08:00
configs.c
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
cpu.c
[PATCH] suspend: don't change cpus_allowed for task initiating the suspend
2006-12-07 08:39:28 -08:00
cpuset.c
[PATCH] hotplug CPU: clean up hotcpu_notifier() use
2006-12-07 08:39:39 -08:00
delayacct.c
[PATCH] slab: remove kmem_cache_t
2006-12-07 08:39:25 -08:00
dma.c
[PATCH] kernel-doc for kernel/dma.c
2006-10-03 08:03:41 -07:00
exec_domain.c
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
exit.c
[PATCH] taskstats: cleanup do_exit() path
2006-12-07 08:39:34 -08:00
extable.c
[PATCH] symbol_put_addr() locks kernel
2006-05-15 11:20:55 -07:00
fork.c
[PATCH] taskstats: cleanup ->signal->stats allocation
2006-12-07 08:39:34 -08:00
futex_compat.c
[PATCH] __user annotations: futex
2006-10-10 15:37:22 -07:00
futex.c
[PATCH] mm: pagefault_{disable,enable}()
2006-12-07 08:39:21 -08:00
hrtimer.c
[PATCH] posix-timers: Fix clock_nanosleep() doesn't return the remaining time in compatibility mode
2006-09-29 09:18:15 -07:00
itimer.c
[PATCH] hrtimers: remove data field
2006-03-26 08:57:03 -08:00
kallsyms.c
[PATCH] /proc/kallsyms reports lower-case types for some non-exported symbols
2006-12-07 08:39:31 -08:00
Kconfig.hz
[PATCH] HZ: 300Hz support
2006-12-07 08:39:36 -08:00
Kconfig.preempt
[PATCH] sched: voluntary kernel preemption
2005-06-25 16:24:45 -07:00
kexec.c
[PATCH] kexec warning fix
2006-09-29 09:18:15 -07:00
kfifo.c
[PATCH] memory ordering in __kfifo primitives
2006-09-29 09:18:13 -07:00
kmod.c
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
2006-12-05 14:37:56 +00:00
kprobes.c
[PATCH] kprobes: enable booster on the preemptible kernel
2006-12-07 08:39:38 -08:00
ksysfs.c
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
kthread.c
WorkStruct: Pass the work_struct pointer instead of context data
2006-11-22 14:55:48 +00:00
latency.c
[PATCH] severing module.h->sched.h
2006-12-04 02:00:22 -05:00
lockdep_internals.h
[PATCH] lockdep: double the number of stack-trace entries
2006-09-13 07:32:14 -07:00
lockdep_proc.c
[PATCH] lockdep: procfs
2006-07-03 15:27:04 -07:00
lockdep.c
[PATCH] remove kernel/lockdep.c:lockdep_internal
2006-12-07 08:39:39 -08:00
Makefile
[PATCH] srcu-3: RCU variant permitting read-side blocking
2006-10-04 07:55:30 -07:00
module.c
[PATCH] severing module.h->sched.h
2006-12-04 02:00:22 -05:00
mutex-debug.c
Lockdep: add lockdep_set_class_and_subclass() and lockdep_set_subclass()
2006-10-11 01:45:14 -04:00
mutex-debug.h
[PATCH] lockdep: better lock debugging
2006-07-03 15:27:01 -07:00
mutex.c
[PATCH] lockdep: prove mutex locking correctness
2006-07-03 15:27:04 -07:00
mutex.h
[PATCH] lockdep: prove mutex locking correctness
2006-07-03 15:27:04 -07:00
nsproxy.c
[PATCH] kernel/nsproxy.c: use kmemdup()
2006-10-20 10:26:44 -07:00
panic.c
[PATCH] x86: Clean up x86 NMI sysctls
2006-09-30 01:47:55 +02:00
params.c
[PATCH] module_subsys: initialize earlier
2006-09-29 09:18:08 -07:00
pid.c
[PATCH] slab: remove kmem_cache_t
2006-12-07 08:39:25 -08:00
posix-cpu-timers.c
[PATCH] posix-cpu-timers: prevent signal delivery starvation
2006-10-17 08:18:43 -07:00
posix-timers.c
[PATCH] slab: remove kmem_cache_t
2006-12-07 08:39:25 -08:00
printk.c
[PATCH] remove the syslog interface when printk is disabled
2006-12-07 08:39:38 -08:00
profile.c
[PATCH] hotplug CPU: clean up hotcpu_notifier() use
2006-12-07 08:39:39 -08:00
ptrace.c
[PATCH] pidspace: is_init()
2006-09-29 09:18:12 -07:00
rcupdate.c
[PATCH] rcu: add a prefetch() in rcu_do_batch()
2006-12-07 08:39:40 -08:00
rcutorture.c
[PATCH] rcu: add sched torture type to rcutorture
2006-10-04 07:55:31 -07:00
relay.c
WorkStruct: make allyesconfig
2006-11-22 14:57:56 +00:00
resource.c
[PATCH] kernel-doc for kernel/resource.c
2006-10-03 08:03:41 -07:00
rtmutex_common.h
[PATCH] pi-futex: futex_lock_pi/futex_unlock_pi support
2006-06-27 17:32:47 -07:00
rtmutex-debug.c
Remove all inclusions of <linux/config.h>
2006-10-04 03:38:54 -04:00
rtmutex-debug.h
[PATCH] lockdep: better lock debugging
2006-07-03 15:27:01 -07:00
rtmutex-tester.c
[PATCH] Add include/linux/freezer.h and move definitions from sched.h
2006-12-07 08:39:27 -08:00
rtmutex.c
[PATCH] clean up and remove some extra spinlocks from rtmutex
2006-09-29 09:18:09 -07:00
rtmutex.h
[PATCH] lockdep: better lock debugging
2006-07-03 15:27:01 -07:00
rwsem.c
[PATCH] lockdep: prove rwsem locking correctness
2006-07-03 15:27:04 -07:00
sched.c
[PATCH] hotplug CPU: clean up hotcpu_notifier() use
2006-12-07 08:39:39 -08:00
seccomp.c
Linux-2.6.12-rc2
2005-04-16 15:20:36 -07:00
signal.c
[PATCH] make kernel/signal.c:kill_proc_info() static
2006-12-07 08:39:39 -08:00
softirq.c
[PATCH] check return value of cpu_callback
2006-09-29 09:18:14 -07:00
softlockup.c
[PATCH] check return value of cpu_callback
2006-09-29 09:18:14 -07:00
spinlock.c
[PATCH] lockdep: spin_lock_irqsave_nested()
2006-11-25 13:28:34 -08:00
srcu.c
[PATCH] SRCU: report out-of-memory errors
2006-10-04 07:55:30 -07:00
stacktrace.c
[PATCH] lockdep: stacktrace subsystem, core
2006-07-03 15:27:02 -07:00
stop_machine.c
[PATCH] stop_machine.c copyright
2006-09-29 09:18:24 -07:00
sys_ni.c
[PATCH] Create compat_sys_migrate_pages
2006-11-03 12:27:59 -08:00
sys.c
WorkStruct: Pass the work_struct pointer instead of context data
2006-11-22 14:55:48 +00:00
sysctl.c
[PATCH] new scheme to preempt swap token
2006-12-07 08:39:21 -08:00
taskstats.c
[PATCH] taskstats: cleanup reply assembling
2006-12-07 08:39:34 -08:00
time.c
[PATCH] NTP: Move all the NTP related code to ntp.c
2006-10-01 00:39:26 -07:00
timer.c
[PATCH] kill wall_jiffies
2006-10-01 00:39:27 -07:00
tsacct.c
[PATCH] xacct_add_tsk: fix pure theoretical ->mm use-after-free
2006-10-30 12:08:41 -08:00
uid16.c
[PATCH] Add more prevent_tail_call()
2006-04-19 16:27:18 -07:00
unwind.c
[PATCH] x86-64: work around gcc4 issue with -Os in Dwarf2 stack unwind
2006-11-28 20:12:59 +01:00
user.c
[PATCH] slab: remove kmem_cache_t
2006-12-07 08:39:25 -08:00
utsname.c
[PATCH] namespaces: utsname: implement CLONE_NEWUTS flag
2006-10-02 07:57:22 -07:00
wait.c
[PATCH] uninline init_waitqueue_head()
2006-07-10 13:24:25 -07:00
workqueue.c
[PATCH] hotplug CPU: clean up hotcpu_notifier() use
2006-12-07 08:39:39 -08:00