Re: kernel/timer: avoid spurious ksoftirqd wakeups (v2)

From: Rik van Riel
Date: Mon Apr 06 2015 - 19:20:21 EST

On 04/06/2015 07:15 PM, Marcelo Tosatti wrote:
> It is only necessary to raise timer softirq
> in case there are active timers.
> Limit the ksoftirqd wakeup to that case.
> Fixes a latency spike with isolated CPUs and
> nohz full mode.
> v2: fix variable initialization
> do not raise timer softirq due to pending irqwork
> Reported-and-tested-by: Luiz Capitulino <lcapitulino@xxxxxxxxxx>
> Signed-off-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>

Reviewed-by: Rik van Riel <riel@xxxxxxxxxx>

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