linux-kernel - Re: [PATCH 1/9] slab: add unlikely macro to help compiler

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Message-ID: <alpine.DEB.2.02.1402141515340.13935@chino.kir.corp.google.com>
Date:	Fri, 14 Feb 2014 15:15:47 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
cc:	Pekka Enberg <penberg@...nel.org>,
	Christoph Lameter <cl@...ux.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Joonsoo Kim <js1304@...il.com>
Subject: Re: [PATCH 1/9] slab: add unlikely macro to help compiler

On Fri, 14 Feb 2014, Joonsoo Kim wrote:

> slab_should_failslab() is called on every allocation, so to optimize it
> is reasonable. We normally don't allocate from kmem_cache. It is just
> used when new kmem_cache is created, so it's very rare case. Therefore,
> add unlikely macro to help compiler optimization.
> 
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

Acked-by: David Rientjes <rientjes@...gle.com>
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