linux-kernel - Re: slab: start_cpu_timer/cache_reap CONFIG_HOTPLUG

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Message-ID: <Pine.LNX.4.64.0702201402420.17433@schroedinger.engr.sgi.com>
Date:	Tue, 20 Feb 2007 14:14:38 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Max Krasnyansky <maxk@...lcomm.com>
cc:	Oleg Nesterov <oleg@...sign.ru>, Ingo Molnar <mingo@...e.hu>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	Gautham shenoy <ego@...ibm.com>, Andrew Morton <akpm@...l.org>,
	linux-kernel@...r.kernel.org
Subject: Re: slab: start_cpu_timer/cache_reap CONFIG_HOTPLUG_CPU problems

On Tue, 20 Feb 2007, Max Krasnyansky wrote:

> Ok. Sounds like disabling cache_reaper is a better option for now. Like you
> said
> it's unlikely that slabs will grow much if that cpu is not heavily used by the
> kernel.

Running for prolonged times without cache_reaper is no good.

What we are talking about here is to disable the cache_reaper during cpu 
shutdown. The slab cpu shutdown will clean the per cpu caches anyways so 
we really do not need the slab_reaper running during cpu shutdown.
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