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Commit 595aac48 authored by Arjan van de Ven's avatar Arjan van de Ven Committed by Ingo Molnar
Browse files

sched: Introduce a function to update the idle statistics 



Currently, two places update the idle statistics (and more to
come later in this series).

This patch creates a helper function for updating these
statistics.

Signed-off-by: default avatarArjan van de Ven <arjan@linux.intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Reviewed-by: default avatarRik van Riel <riel@redhat.com>
Acked-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: davej@redhat.com
LKML-Reference: <20100509082245.163e67ed@infradead.org>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent b1f724c3

kernel/time/tick-sched.c

+19 −10
Original line number Diff line number Diff line
@@ -150,14 +150,25 @@ static void tick_nohz_update_jiffies(ktime_t now) 
	touch_softlockup_watchdog();

}



static void tick_nohz_stop_idle(int cpu, ktime_t now)

/*

 * Updates the per cpu time idle statistics counters

 */

static void update_ts_time_stats(struct tick_sched *ts, ktime_t now)

{

	struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);

	ktime_t delta;



	delta = ktime_sub(now, ts->idle_entrytime);

	ts->idle_lastupdate = now;

	if (ts->idle_active) {

		delta = ktime_sub(now, ts->idle_entrytime);

		ts->idle_sleeptime = ktime_add(ts->idle_sleeptime, delta);

	}

}



static void tick_nohz_stop_idle(int cpu, ktime_t now)

{

	struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);



	update_ts_time_stats(ts, now);

	ts->idle_active = 0;



	sched_clock_idle_wakeup_event(0);
@@ -165,14 +176,12 @@ static void tick_nohz_stop_idle(int cpu, ktime_t now) 


static ktime_t tick_nohz_start_idle(struct tick_sched *ts)

{

	ktime_t now, delta;

	ktime_t now;



	now = ktime_get();

	if (ts->idle_active) {

		delta = ktime_sub(now, ts->idle_entrytime);

		ts->idle_lastupdate = now;

		ts->idle_sleeptime = ktime_add(ts->idle_sleeptime, delta);

	}



	update_ts_time_stats(ts, now);



	ts->idle_entrytime = now;

	ts->idle_active = 1;

	sched_clock_idle_sleep_event();