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mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-24 13:13:57 +08:00
linux-next/kernel/time
Mike Galbraith 39c0cbe215 sched: Rate-limit nohz
Entering nohz code on every micro-idle is costing ~10% throughput for netperf
TCP_RR when scheduling cross-cpu.  Rate limiting entry fixes this, but raises
ticks a bit.  On my Q6600, an idle box goes from ~85 interrupts/sec to 128.

The higher the context switch rate, the more nohz entry costs.  With this patch
and some cycle recovery patches in my tree, max cross cpu context switch rate is
improved by ~16%, a large portion of which of which is this ratelimiting.

Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1268301003.6785.28.camel@marge.simson.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2010-03-11 18:32:49 +01:00
..
clockevents.c clockevent: Don't remove broadcast device when cpu is dead 2010-01-18 14:44:50 +01:00
clocksource.c Merge branch 'timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-03-01 08:48:25 -08:00
jiffies.c clocksource: Cleanup clocksource selection 2009-08-15 10:55:46 +02:00
Kconfig Kconfig: eliminate "def_bool n" constructs 2008-10-16 11:21:31 -07:00
Makefile time: add function to convert between calendar time and broken-down time for universal use 2009-09-24 07:20:56 -07:00
ntp.c ntp: Cleanup xtime references in ntp.c 2010-01-29 10:15:19 +01:00
tick-broadcast.c clockevents: Convert to raw_spinlock 2009-12-14 23:55:34 +01:00
tick-common.c clockevents: Convert to raw_spinlock 2009-12-14 23:55:34 +01:00
tick-internal.h clockevents: Make tick_device_lock static 2009-12-14 23:55:34 +01:00
tick-oneshot.c nohz: Allow 32-bit machines to sleep for more than 2.15 seconds 2009-11-13 20:46:24 +01:00
tick-sched.c sched: Rate-limit nohz 2010-03-11 18:32:49 +01:00
timecompare.c timecompare: fix half-Y2K38 problem in timecompare_update while calculating offset 2009-12-16 07:19:57 -08:00
timeconv.c time: add function to convert between calendar time and broken-down time for universal use 2009-09-24 07:20:56 -07:00
timekeeping.c Merge branch 'timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-03-01 08:48:25 -08:00
timer_list.c cpumask: avoid dereferencing struct cpumask 2009-12-17 11:43:29 +10:30
timer_stats.c hrtimers: Convert to raw_spinlocks 2009-12-14 23:55:34 +01:00