Thomas Gleixner dce48a84ad sched, timers: move calc_load() to scheduler ... Dimitri Sivanich noticed that xtime_lock is held write locked across calc_load() which iterates over all online CPUs. That can cause long latencies for xtime_lock readers on large SMP systems. The load average calculation is an rough estimate anyway so there is no real need to protect the readers vs. the update. It's not a problem when the avenrun array is updated while a reader copies the values. Instead of iterating over all online CPUs let the scheduler_tick code update the number of active tasks shortly before the avenrun update happens. The avenrun update itself is handled by the CPU which calls do_timer(). [ Impact: reduce xtime_lock write locked section ] Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra <peterz@infradead.org>		2009-05-15 15:32:45 +02:00
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clockevents.c
clocksource.c	clocksource: pass clocksource to read() callback	2009-04-21 13:41:47 -07:00
jiffies.c	clocksource: pass clocksource to read() callback	2009-04-21 13:41:47 -07:00
Kconfig
Makefile
ntp.c
tick-broadcast.c
tick-common.c	clockevents: prevent endless loop in tick_handle_periodic()	2009-05-02 10:22:27 +02:00
tick-internal.h
tick-oneshot.c
tick-sched.c
timecompare.c
timekeeping.c	sched, timers: move calc_load() to scheduler	2009-05-15 15:32:45 +02:00
timer_list.c
timer_stats.c