Ingo Molnar 47aa8b6cbc nohz: Reduce overhead under high-freq idling patterns ... One testbox of mine (Intel Nehalem, 16-way) uses MWAIT for its idle routine, which apparently can break out of its idle loop rather frequently, with high frequency. In that case NO_HZ_FULL=y kernels show high ksoftirqd overhead and constant context switching, because tick_nohz_stop_sched_tick() will, if delta_jiffies == 0, mis-identify this as a timer event - activating the TIMER_SOFTIRQ, which wakes up ksoftirqd. Fix this by treating delta_jiffies == 0 the same way we treat other short wakeups, delta_jiffies == 1. Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Christoph Lameter <cl@linux.com> Cc: Geoff Levand <geoff@infradead.org> Cc: Gilad Ben Yossef <gilad@benyossef.com> Cc: Hakan Akkan <hakanakkan@gmail.com> Cc: Kevin Hilman <khilman@linaro.org> Cc: Li Zhong <zhong@linux.vnet.ibm.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Ingo Molnar <mingo@kernel.org>		2013-04-26 10:13:42 +02:00
..
alarmtimer.c	alarmtimer: Rename alarmtimer_remove to alarmtimer_dequeue	2012-09-24 12:38:03 -04:00
clockevents.c	clockevents: export clockevents_config_and_register for module use	2013-01-14 10:12:37 -08:00
clocksource.c
jiffies.c	time: Kill xtime_lock, replacing it with jiffies_lock	2012-11-13 14:08:23 -05:00
Kconfig	nohz: Remove full dynticks' superfluous dependency on RCU tree	2013-04-24 16:17:36 +02:00
Makefile	time: remove the timecompare code.	2012-11-01 11:41:35 -04:00
ntp.c	Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2013-02-22 19:25:09 -08:00
posix-clock.c
tick-broadcast.c	nohz: Switch from "extended nohz" to "full nohz" based naming	2013-04-15 19:58:17 +02:00
tick-common.c	nohz: Switch from "extended nohz" to "full nohz" based naming	2013-04-15 19:58:17 +02:00
tick-internal.h	time: Kill xtime_lock, replacing it with jiffies_lock	2012-11-13 14:08:23 -05:00
tick-oneshot.c
tick-sched.c	nohz: Reduce overhead under high-freq idling patterns	2013-04-26 10:13:42 +02:00
timeconv.c
timekeeping.c	arm-soc: cleanups	2013-02-21 14:58:40 -08:00
timer_list.c
timer_stats.c