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

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Message-ID: <20150413110640.40f137c4@redhat.com>
Date:	Mon, 13 Apr 2015 11:06:40 -0400
From:	Luiz Capitulino <lcapitulino@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Marcelo Tosatti <mtosatti@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org, Rik van Riel <riel@...hat.com>
Subject: Re: kernel/timer: avoid spurious ksoftirqd wakeups (v2)

On Sat, 11 Apr 2015 11:25:49 +0200 (CEST)
Thomas Gleixner <tglx@...utronix.de> wrote:

> On Fri, 10 Apr 2015, Luiz Capitulino wrote:
> > On Fri, 10 Apr 2015 15:09:07 -0300
> > > It seems a valid solution for this interrupt is to program 
> > > sched_timer to the nearest future possible. 
> > 
> > What about calling the timer function right there, like
> > hrtimer_interrupt() does?
> 
> No, you cannot call the timer function from the enqueue path. The
> caller might hold a lock which is taken in the callback as well.....

Fair enough. We're going to think about a different solution.

> 
> Thanks,
> 
> 	tglx
> 

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