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

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Message-ID: <552314A1.9090800@redhat.com>
Date:	Mon, 06 Apr 2015 19:20:01 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Marcelo Tosatti <mtosatti@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>
CC:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: kernel/timer: avoid spurious ksoftirqd wakeups (v2)

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@...hat.com>
> Signed-off-by: Marcelo Tosatti <mtosatti@...hat.com>

Reviewed-by: Rik van Riel <riel@...hat.com>

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