linux-kernel - Re: [patch 12/26] SLUB: Slab defragmentation core

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Message-ID: <Pine.LNX.4.64.0706261217250.20282@schroedinger.engr.sgi.com>
Date:	Tue, 26 Jun 2007 12:19:24 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Nish Aravamudan <nish.aravamudan@...il.com>
cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Pekka Enberg <penberg@...helsinki.fi>,
	suresh.b.siddha@...el.com
Subject: Re: [patch 12/26] SLUB: Slab defragmentation core

On Tue, 26 Jun 2007, Nish Aravamudan wrote:

> >    kmem_cache_defrag takes a node parameter. This can either be -1 if
> >    defragmentation should be performed on all nodes, or a node number.
> >    If a node number was specified then defragmentation is only performed
> >    on a specific node.
> 
> Hrm, isn't -1 usually 'this node' for NUMA systems? Maybe nr_node_ids
> or MAX_NUMNODES should mean 'all nodes'?

-1 means no node specified. What the function does in this case depends
on the function. For "this node" you can use numa_node_id().
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