iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
linux/kernel
History
Peter Zijlstra 8f4d37ec07 sched: high-res preemption tick 
Use HR-timers (when available) to deliver an accurate preemption tick.

The regular scheduler tick that runs at 1/HZ can be too coarse when nice
level are used. The fairness system will still keep the cpu utilisation 'fair'
by then delaying the task that got an excessive amount of CPU time but try to
minimize this by delivering preemption points spot-on.

The average frequency of this extra interrupt is sched_latency / nr_latency.
Which need not be higher than 1/HZ, its just that the distribution within the
sched_latency period is important.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-01-25 21:08:29 +01:00
..
irq
genirq: revert lazy irq disable for simple irqs
2007-12-18 18:05:58 +01:00
power
driver core: make /sys/power a kobject
2008-01-24 20:40:25 -08:00
time
Driver core: change sysdev classes to use dynamic kobject names
2008-01-24 20:40:40 -08:00
.gitignore
…
acct.c
acct: real_parent ppid
2008-01-07 14:55:37 -08:00
audit_tree.c
[PATCH] audit: watching subtrees
2007-10-21 02:37:45 -04:00
audit.c
[PATCH] audit: watching subtrees
2007-10-21 02:37:45 -04:00
audit.h
[PATCH] audit: watching subtrees
2007-10-21 02:37:45 -04:00
auditfilter.c
[PATCH] audit: watching subtrees
2007-10-21 02:37:45 -04:00
auditsc.c
auditsc: fix kernel-doc param warnings
2007-10-22 19:40:02 -07:00
capability.c
Uninline find_pid etc set of functions
2007-10-19 11:53:41 -07:00
cgroup_debug.c
Task Control Groups: simple task cgroup debug info subsystem
2007-10-19 11:53:36 -07:00
cgroup.c
Improve cgroup printks
2007-11-14 18:45:37 -08:00
compat.c
Merge ssh://master.kernel.org/pub/scm/linux/kernel/git/tglx/linux-2.6-hrt
2007-10-18 15:12:41 -07:00
configs.c
use simple_read_from_buffer in kernel/
2007-05-09 12:30:49 -07:00
cpu.c
cpu-hotplug: replace per-subsystem mutexes with get_online_cpus()
2008-01-25 21:08:02 +01:00
cpuset.c
cpu-hotplug: replace lock_cpu_hotplug() with get_online_cpus()
2008-01-25 21:08:02 +01:00
delayacct.c
Add scaled time to taskstats based process accounting
2007-10-18 14:37:28 -07:00
dma.c
whitespace fixes: DMA channel allocator
2007-10-18 14:37:24 -07:00
exec_domain.c
whitespace fixes: execution domains
2007-10-18 14:37:26 -07:00
exit.c
wait_task_stopped(): pass correct exit_code to wait_noreap_copyout()
2007-11-29 09:24:55 -08:00
extable.c
[PATCH] symbol_put_addr() locks kernel
2006-05-15 11:20:55 -07:00
fork.c
Preempt-RCU: implementation
2008-01-25 21:08:24 +01:00
futex_compat.c
[FUTEX] Fix address computation in compat code.
2007-11-09 16:13:08 -08:00
futex.c
futex: Prevent stale futex owner when interrupted/timeout
2008-01-08 16:21:39 -08:00
hrtimer.c
hrtimer: fix section mismatch
2008-01-21 19:39:41 -08:00
itimer.c
whitespace fixes: interval timers
2007-10-18 14:37:26 -07:00
kallsyms.c
FRV: fix the extern declaration of kallsyms_num_syms
2007-11-29 09:24:54 -08:00
Kconfig.hz
sched: high-res preemption tick
2008-01-25 21:08:29 +01:00
Kconfig.instrumentation
Tiny clean-up of OPROFILE/KPROBES configuration
2007-12-06 09:41:12 -08:00
Kconfig.preempt
Preempt-RCU: implementation
2008-01-25 21:08:24 +01:00
kexec.c
vmcoreinfo: add the array length of "free_list" for filtering free pages
2008-01-08 16:10:36 -08:00
kfifo.c
is_power_of_2: kernel/kfifo.c
2007-07-16 09:05:50 -07:00
kmod.c
Fix unbalanced helper_lock in kernel/kmod.c
2008-01-17 15:38:59 -08:00
kprobes.c
kprobes: support kretprobe blacklist
2007-10-16 09:43:10 -07:00
ksysfs.c
Kobject: convert remaining kobject_unregister() to kobject_put()
2008-01-24 20:40:40 -08:00
kthread.c
kthread: silence bogus section mismatch warning
2007-07-31 15:39:42 -07:00
latency.c
[PATCH] severing module.h->sched.h
2006-12-04 02:00:22 -05:00
lockdep_internals.h
[PATCH] lockdep: more chains
2006-12-07 08:39:43 -08:00
lockdep_proc.c
lockdep: Avoid /proc/lockdep & lock_stat infinite output
2007-10-11 22:11:11 +02:00
lockdep.c
softlockup: automatically detect hung TASK_UNINTERRUPTIBLE tasks
2008-01-25 21:08:02 +01:00
Makefile
Preempt-RCU: implementation
2008-01-25 21:08:24 +01:00
marker.c
Linux Kernel Markers: fix marker mutex not taken upon module load
2007-11-14 18:45:40 -08:00
module.c
Kobject: convert remaining kobject_unregister() to kobject_put()
2008-01-24 20:40:40 -08:00
mutex-debug.c
[PATCH] remove many unneeded #includes of sched.h
2007-02-14 08:09:54 -08:00
mutex-debug.h
[PATCH] lockdep: better lock debugging
2006-07-03 15:27:01 -07:00
mutex.c
lockdep: fixup mutex annotations
2007-10-11 22:11:12 +02:00
mutex.h
[PATCH] lockdep: prove mutex locking correctness
2006-07-03 15:27:04 -07:00
notifier.c
Add kernel/notifier.c
2007-10-19 11:53:34 -07:00
ns_cgroup.c
cgroups: implement namespace tracking subsystem
2007-10-19 11:53:37 -07:00
nsproxy.c
pid namespaces: allow cloning of new namespace
2007-10-19 11:53:39 -07:00
panic.c
debug: add end-of-oops marker
2007-12-20 15:01:17 +01:00
params.c
Modules: remove unneeded release function
2008-01-24 20:40:39 -08:00
pid.c
pidns: Place under CONFIG_EXPERIMENTAL
2007-11-14 18:45:43 -08:00
posix-cpu-timers.c
sched: SCHED_FIFO/SCHED_RR watchdog timer
2008-01-25 21:08:27 +01:00
posix-timers.c
Isolate some explicit usage of task->tgid
2007-10-19 11:53:40 -07:00
printk.c
sched: remove printk_clock()
2008-01-25 21:07:59 +01:00
profile.c
sched: document profile=sleep requiring CONFIG_SCHEDSTATS
2007-10-24 18:23:50 +02:00
ptrace.c
ptrace: Call arch_ptrace_attach() when request=PTRACE_TRACEME
2008-01-25 08:31:39 +01:00
rcuclassic.c
Preempt-RCU: implementation
2008-01-25 21:08:24 +01:00
rcupdate.c
Preempt-RCU: fix rcu_barrier for preemptive environment.
2008-01-25 21:08:24 +01:00
rcupreempt_trace.c
Preempt-RCU: implementation
2008-01-25 21:08:24 +01:00
rcupreempt.c
Preempt-RCU: CPU Hotplug handling
2008-01-25 21:08:25 +01:00
rcutorture.c
cpu-hotplug: replace lock_cpu_hotplug() with get_online_cpus()
2008-01-25 21:08:02 +01:00
relay.c
whitespace fixes: relayfs
2007-10-18 14:37:24 -07:00
resource.c
Add IORESOUCE_BUSY flag for System RAM
2007-11-14 18:45:39 -08:00
rtmutex_common.h
FUTEX: Tidy up the code
2007-07-16 09:05:49 -07:00
rtmutex-debug.c
Use helpers to obtain task pid in printks
2007-10-19 11:53:43 -07:00
rtmutex-debug.h
[PATCH] lockdep: better lock debugging
2006-07-03 15:27:01 -07:00
rtmutex-tester.c
Driver core: change sysdev classes to use dynamic kobject names
2008-01-24 20:40:40 -08:00
rtmutex.c
Use helpers to obtain task pid in printks
2007-10-19 11:53:43 -07:00
rtmutex.h
[PATCH] lockdep: better lock debugging
2006-07-03 15:27:01 -07:00
rwsem.c
sched: mark rwsem functions as __sched for wchan/profiling
2007-12-18 15:21:13 +01:00
sched_debug.c
sched: fix gcc warnings
2007-12-30 17:24:35 +01:00
sched_fair.c
sched: high-res preemption tick
2008-01-25 21:08:29 +01:00
sched_idletask.c
sched: high-res preemption tick
2008-01-25 21:08:29 +01:00
sched_rt.c
sched: high-res preemption tick
2008-01-25 21:08:29 +01:00
sched_stats.h
sched: clean up kernel/sched_stat.h
2007-11-28 15:52:56 +01:00
sched.c
sched: high-res preemption tick
2008-01-25 21:08:29 +01:00
seccomp.c
make seccomp zerocost in schedule
2007-07-16 09:05:50 -07:00
signal.c
sigwait eats blocked default-ignore signals
2007-11-12 16:05:23 -08:00
softirq.c
[KERNEL]: Unexport raise_softirq_irqoff
2007-10-10 16:49:18 -07:00
softlockup.c
softlockup: automatically detect hung TASK_UNINTERRUPTIBLE tasks
2008-01-25 21:08:02 +01:00
spinlock.c
lockstat: hook into spinlock_t, rwlock_t, rwsem and mutex
2007-07-19 10:04:49 -07:00
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
cpu-hotplug: replace lock_cpu_hotplug() with get_online_cpus()
2008-01-25 21:08:02 +01:00
sys_ni.c
[COMPAT]: Fix build on COMPAT platforms when CONFIG_NET is disabled.
2007-10-30 21:29:56 -07:00
sys.c
x86: ignore the sys_getcpu() tcache parameter
2007-11-17 16:27:00 +01:00
sysctl_check.c
sysctl: fix ax25 checks
2007-12-17 19:28:17 -08:00
sysctl.c
softlockup: automatically detect hung TASK_UNINTERRUPTIBLE tasks
2008-01-25 21:08:02 +01:00
taskstats.c
kernel/taskstats.c: fix bogus nlmsg_free()
2007-11-14 18:45:44 -08:00
time.c
whitespace fixes: time syscalls
2007-10-18 14:37:24 -07:00
timer.c
timer: fix section mismatch
2008-01-21 19:39:41 -08:00
tsacct.c
Add scaled time to taskstats based process accounting
2007-10-18 14:37:28 -07:00
uid16.c
header cleaning: don't include smp_lock.h when not used
2007-05-08 11:15:07 -07:00
user_namespace.c
Fix user namespace exiting OOPs
2007-09-19 11:24:18 -07:00
user.c
uids: merge multiple error paths in alloc_uid() into one
2008-01-25 21:08:26 +01:00
utsname_sysctl.c
Isolate the UTS namespace's domainname and hostname back
2007-11-29 09:24:53 -08:00
utsname.c
Fix UTS corruption during clone(CLONE_NEWUTS)
2007-09-19 11:24:17 -07:00
wait.c
Fix occurrences of "the the "
2007-05-09 08:57:56 +02:00
workqueue.c
cpu-hotplug: replace per-subsystem mutexes with get_online_cpus()
2008-01-25 21:08:02 +01:00