linux-kernel - Re: RFC: THE OFFLINE SCHEDULER

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Message-ID: <alpine.DEB.1.10.0908281619520.15573@gentwo.org>
Date:	Fri, 28 Aug 2009 16:21:33 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Thomas Gleixner <tglx@...utronix.de>
cc:	Gregory Haskins <ghaskins@...ell.com>,
	Rik van Riel <riel@...hat.com>,
	Chris Friesen <cfriesen@...tel.com>,
	raz ben yehuda <raziebe@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>, mingo@...e.hu,
	peterz@...radead.org, maximlevitsky@...il.com, efault@....de,
	wiseman@...s.biu.ac.il, linux-kernel@...r.kernel.org,
	linux-rt-users@...r.kernel.org
Subject: Re: RFC: THE OFFLINE SCHEDULER

On Fri, 28 Aug 2009, Thomas Gleixner wrote:

> The statistics stuff needs to be tackled anyway as we need to offload
> the sched accounting to some other cpu.

The vm statisticcs in mm/vmstat.c are different from the sched accounting.

> What slab queue stuff is running on timers and cannot be switched off
> in such a context?

slab does run a timer every 2 second to age queues. If there was activity
then there can be a relatively long time in which we periodically throw
out portions of the cached data.

> Device specific stuff should not happen on such a CPU when there is no
> device handled on it.

The device may periodically check for conditions that require action.
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