linux-kernel - Re: unnecessary timer interrupt of slab.c and bdi tasks when the system is in sleep state

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Message-ID: <20101001152715.GA5338@nowhere>
Date:	Fri, 1 Oct 2010 17:27:19 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	"Van De Ven, Arjan" <arjan.van.de.ven@...el.com>
Cc:	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	"Wu, Xia" <xia.wu@...el.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Zhu, Daniel" <daniel.zhu@...el.com>,
	"Wang, Yong Y" <yong.y.wang@...el.com>
Subject: Re: unnecessary timer interrupt of slab.c and bdi tasks when the
	system is in sleep state

On Fri, Oct 01, 2010 at 08:20:22AM -0700, Van De Ven, Arjan wrote:
> 
> > > the slab timer is already deferable... which means it won't hit while
> > the system is completely idle.
> > 
> > 
> > I'm not sure what you mean exactly. The slab work seems to be scheduled
> > strictly
> > periodically, unless the cpu goes offline. But I can't find any nohz-
> > wise adaptation.
> > 
> 
>                 INIT_DELAYED_WORK_DEFERRABLE(reap_work, cache_reap);
> 
> that will cause it to only run when the cpu is actually idle...


Aah ok, I missed that. Thanks.

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