linux-kernel - Re: [PATCH 6/6] Use one zonelist that is filtered by nodemask

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Message-Id: <1192031620.5617.39.camel@localhost>
Date:	Wed, 10 Oct 2007 11:53:40 -0400
From:	Lee Schermerhorn <Lee.Schermerhorn@...com>
To:	Mel Gorman <mel@...net.ie>
Cc:	Nishanth Aravamudan <nacc@...ibm.com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	rientjes@...gle.com, kamezawa.hiroyu@...fujitsu.com,
	clameter@....com
Subject: Re: [PATCH 6/6] Use one zonelist that is filtered by nodemask

On Tue, 2007-10-09 at 16:40 +0100, Mel Gorman wrote:
<snip>
> ====
> Subject: Use specified node ID with GFP_THISNODE if available
> 
> It had been assumed that __GFP_THISNODE meant allocating from the local
> node and only the local node. However, users of alloc_pages_node() may also
> specify GFP_THISNODE. In this case, only the specified node should be used.
> This patch will allocate pages only from the requested node when GFP_THISNODE
> is used with alloc_pages_node().
> 
> [nacc@...ibm.com: Detailed analysis of problem]
> Found-by: Lee Schermerhorn <Lee.Schermerhorn@...com>
> Signed-off-by: Mel Gorman <mel@....ul.ie>
> 
<snip>

Mel:  I applied this patch [to your v8 series--the most recent, I
think?] and it does fix the problem.  However, now I'm tripping over
this warning in __alloc_pages_nodemask:

	/* Specifying both __GFP_THISNODE and nodemask is stupid. Warn user */
	WARN_ON(gfp_mask & __GFP_THISNODE);

for each huge page allocated.  Rather slow as my console is a virtual
serial line and the warning includes the stack traceback.

I think we want to just drop this warning, but maybe you have a tighter
condition that you want to warn about?

Lee

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