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Commit 98f4ebb2 authored by Anton Blanchard's avatar Anton Blanchard Committed by Linus Torvalds
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mm: align vmstat_work's timer 



Even though vmstat_work is marked deferrable, there are still benefits to
aligning it.  For certain applications we want to keep OS jitter as low as
possible and aligning timers and work so they occur together can reduce
their overall impact.

Signed-off-by: default avatarAnton Blanchard <anton@samba.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent d2caa3c5

mm/vmstat.c

+3 −2
Original line number Diff line number Diff line
@@ -891,7 +891,7 @@ static void vmstat_update(struct work_struct *w) 
{

	refresh_cpu_vm_stats(smp_processor_id());

	schedule_delayed_work(&__get_cpu_var(vmstat_work),

		sysctl_stat_interval);

		round_jiffies_relative(sysctl_stat_interval));

}



static void __cpuinit start_cpu_timer(int cpu)
@@ -899,7 +899,8 @@ static void __cpuinit start_cpu_timer(int cpu) 
	struct delayed_work *vmstat_work = &per_cpu(vmstat_work, cpu);



	INIT_DELAYED_WORK_DEFERRABLE(vmstat_work, vmstat_update);

	schedule_delayed_work_on(cpu, vmstat_work, HZ + cpu);

	schedule_delayed_work_on(cpu, vmstat_work,

				 __round_jiffies_relative(HZ, cpu));

}



/*