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Commit 62cb1188 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

sched/idle: Move quiet_vmstate() into the NOHZ code 



quiet_vmstat() is an expensive function that only makes sense when we
go into NOHZ.

Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: aubrey.li@linux.intel.com
Cc: cl@linux.com
Cc: fweisbec@gmail.com
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 151aeab7

kernel/sched/idle.c

+0 −1
Original line number Diff line number Diff line
@@ -219,7 +219,6 @@ static void do_idle(void) 
	 */



	__current_set_polling();

	quiet_vmstat();

	tick_nohz_idle_enter();



	while (!need_resched()) {

kernel/time/tick-sched.c

+2 −0
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ 
#include <linux/irq_work.h>

#include <linux/posix-timers.h>

#include <linux/context_tracking.h>

#include <linux/mm.h>



#include <asm/irq_regs.h>
@@ -787,6 +788,7 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts, 
	if (!ts->tick_stopped) {

		calc_load_nohz_start();

		cpu_load_update_nohz_start();

		quiet_vmstat();



		ts->last_tick = hrtimer_get_expires(&ts->sched_timer);

		ts->tick_stopped = 1;