mm: align vmstat_work's timer (98f4ebb2) · Commits · 戴 / test

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:

Anton Blanchard <anton@samba.org> Signed-off-by:

Andrew Morton <akpm@linux-foundation.org> Signed-off-by:

Linus Torvalds <torvalds@linux-foundation.org>

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));
		}

		/*

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