linux-kernel - Re: [patch] slab: Do not use mempolicy for kmalloc

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Date:	Wed, 13 Sep 2006 16:59:09 -0700
From:	Ravikiran G Thirumalai <kiran@...lex86.org>
To:	Christoph Lameter <clameter@....com>
Cc:	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	Alok Kataria <alok.kataria@...softinc.com>,
	"Shai Fultheim (Shai@...lex86.org)" <shai@...lex86.org>,
	Christoph Lameter <clameter@...r.sgi.com>,
	"Benzi Galili (Benzi@...leMP.com)" <benzi@...lemp.com>
Subject: Re: [patch] slab: Do not use mempolicy for kmalloc_node

On Wed, Sep 13, 2006 at 04:48:58PM -0700, Christoph Lameter wrote:
> On Wed, 13 Sep 2006, Ravikiran G Thirumalai wrote:
> 
> The two cases were your patch still applied memory policies were:
> 
> 1. nodeid = -1. This is one particular case that we wanted to fix because
>    it means use numa_node_id().

OK, I did not realise nodeid = -1 _should_ imply current node.  Not using
mempolicy makes sense then.

> 
> 2. The case where the nodelist does not yet exist.
> 
> AFAIK this situation only occurs on boot strap when we are actually 
> attempting to allocate from a different node than what we are running on. 
> Falling back to the local node is the right thing to do because we have 
> that already working. A process that is running on a node must always have 
> the nodelists for all caches allocated. The cpuup callbacks take care of that.
> 
> kmalloc_node needs work like page_alloc_node. page_alloc_node() never 
> consults memory policies and thus one would not expect kmalloc_node to do 
> so either.

OK.
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