linux-kernel - Re: [PATCH] slab: do not call compound_head() in page_get

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Message-ID: <alpine.DEB.2.00.1206201837320.7850@chino.kir.corp.google.com>
Date:	Wed, 20 Jun 2012 18:37:49 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Michel Lespinasse <walken@...gle.com>
cc:	linux-mm@...ck.org, Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] slab: do not call compound_head() in page_get_cache()

On Wed, 20 Jun 2012, Michel Lespinasse wrote:

> page_get_cache() does not need to call compound_head(), as its unique
> caller virt_to_slab() already makes sure to return a head page.
> 
> Additionally, removing the compound_head() call makes page_get_cache()
> consistent with page_get_slab().
> 
> Signed-off-by: Michel Lespinasse <walken@...gle.com>

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