linux-kernel - Re: [patch 0/7] [RFC] SLUB: Improve allocpercpu to reduce per cpu access overhead

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Message-Id: <20071112.132859.82406611.davem@davemloft.net>
Date:	Mon, 12 Nov 2007 13:28:59 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	clameter@....com, akpm@...ux-foundation.org,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	mathieu.desnoyers@...ymtl.ca, penberg@...helsinki.fi
Subject: Re: [patch 0/7] [RFC] SLUB: Improve allocpercpu to reduce per cpu
 access overhead

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Mon, 12 Nov 2007 18:52:35 +0800

> David Miller <davem@...emloft.net> wrote:
> > 
> > Each IP compression tunnel instance does an alloc_percpu().
> 
> Actually all IPComp tunnels share one set of objects which are
> allocated per-cpu.  So only the first tunnel would do that.
> 
> In fact that was precisely the reason why per-cpu is used in
> IPComp as otherwise we can just allocate normal memory.

Hmmm... indeed.  Thanks for clearing this up.
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