[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <Pine.LNX.4.64.0711090741120.13932@schroedinger.engr.sgi.com>
Date: Fri, 9 Nov 2007 07:45:33 -0800 (PST)
From: Christoph Lameter <clameter@....com>
To: Mel Gorman <mel@....ul.ie>
cc: akpm@...ux-foundation.org, Lee.Schermerhorn@...com,
linux-kernel@...r.kernel.org, linux-mm@...ck.org,
rientjes@...gle.com, nacc@...ibm.com,
kamezawa.hiroyu@...fujitsu.com
Subject: Re: [PATCH 6/6] Use one zonelist that is filtered by nodemask
On Fri, 9 Nov 2007, Mel Gorman wrote:
> struct page * fastcall
> __alloc_pages(gfp_t gfp_mask, unsigned int order,
> struct zonelist *zonelist)
> {
> + /*
> + * Use a temporary nodemask for __GFP_THISNODE allocations. If the
> + * cost of allocating on the stack or the stack usage becomes
> + * noticable, allocate the nodemasks per node at boot or compile time
> + */
> + if (unlikely(gfp_mask & __GFP_THISNODE)) {
> + nodemask_t nodemask;
Hmmm.. This places a potentially big structure on the stack. nodemask can
contain up to 1024 bits which means 128 bytes. Maybe keep an array of
gfp_thisnode nodemasks (node_nodemask?) and use node_nodemask[nid]?
> +
> + return __alloc_pages_internal(gfp_mask, order,
> + zonelist, nodemask_thisnode(numa_node_id(), &nodemask));
Argh.... GFP_THISNODE must use the nid passed to alloc_pages_node and
*not* the local numa node id. Only if the node specified to alloc_pages
nodes is -1 will this work.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists