Commit-ID: 62cb1188ed86a9cf082fd2f757d4dd9b54741f24
Gitweb: https://git.kernel.org/tip/62cb1188ed86a9cf082fd2f757d4dd9b54741f24
Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
AuthorDate: Tue, 29 Aug 2017 15:07:54 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 10 Oct 2017 11:43:29 +0200
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: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: aubrey.li@xxxxxxxxxxxxxxx
Cc: cl@xxxxxxxxx
Cc: fweisbec@xxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
kernel/sched/idle.c | 1 -
kernel/time/tick-sched.c | 2 ++
2 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c
index 257f4f0..b2e8f0a 100644
--- a/kernel/sched/idle.c
+++ b/kernel/sched/idle.c
@@ -219,7 +219,6 @@ static void do_idle(void)
*/
__current_set_polling();
- quiet_vmstat();
tick_nohz_idle_enter();
while (!need_resched()) {
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index c7a899c..7b258c5 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -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;
--
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