linux-kernel - Re: [PATCH] slob: poor man's NUMA support.

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Message-ID: <Pine.LNX.4.64.0706261112380.18010@schroedinger.engr.sgi.com>
Date:	Tue, 26 Jun 2007 11:14:18 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Paul Mundt <lethal@...ux-sh.org>, Matt Mackall <mpm@...enic.com>,
	Nick Piggin <nickpiggin@...oo.com.au>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] slob: poor man's NUMA support.

On Tue, 26 Jun 2007, Andrew Morton wrote:

> > +#ifdef CONFIG_NUMA
> > +	if (node != -1)
> > +		page = alloc_pages_node(node, gfp, order);
> > +	else
> > +#endif
> > +		page = alloc_pages(gfp, order);
> 
> Isn't the above equivalent to a bare
> 
> 	page = alloc_pages_node(node, gfp, order);
> 
> ?

No. alloc_pages follows memory policy. alloc_pages_node does not. One of 
the reasons that I want a new memory policy layer are these kinds of 
strange uses.

> 
> 	if (node < 0
> 
> rather than comparing with -1 exactly.
> 
> On many CPUs it'll save a few bytes of code.

-1 means no node specified and much of the NUMA code compares with -1.

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