linux-kernel - Re: [PATCH] mm: don't invoke __alloc_pages_direct

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Message-ID: <alpine.DEB.2.00.1207070139510.10445@chino.kir.corp.google.com>
Date:	Sat, 7 Jul 2012 01:40:23 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Joonsoo Kim <js1304@...il.com>
cc:	akpm@...ux-foundation.org, Pekka Enberg <penberg@...nel.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] mm: don't invoke __alloc_pages_direct_compact when order
 0

On Sat, 7 Jul 2012, Joonsoo Kim wrote:

> __alloc_pages_direct_compact has many arguments so invoking it is very costly.
> And in almost invoking case, order is 0, so return immediately.
> 

If "zero cost" is "very costly", then this might make sense.

__alloc_pages_direct_compact() is inlined by gcc.
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