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Date:	Thu, 22 May 2014 11:23:57 -0700
From:	Andrew Morton <>
To:	Vlastimil Babka <>
Cc:	Mel Gorman <>, Joonsoo Kim <>,
	Johannes Weiner <>, Jan Kara <>,
	Michal Hocko <>, Hugh Dickins <>,
	Peter Zijlstra <>,
	Dave Hansen <>,
	Linux Kernel <>,
	Linux-MM <>,
	Linux-FSDevel <>
Subject: Re: [PATCH 09/19] mm: page_alloc: Use word-based accesses for
 get/set pageblock bitmaps

On Thu, 22 May 2014 11:24:23 +0200 Vlastimil Babka <> wrote:

> > In a test running dd onto tmpfs the overhead of the pageblock-related
> > functions went from 1.27% in profiles to 0.5%.
> > 
> > Signed-off-by: Mel Gorman <>
> > Acked-by: Vlastimil Babka <>
> Hi, I've tested if this closes the race I've been previously trying to fix
> with the series in
> And indeed with this patch I wasn't able to reproduce it in my stress test
> (which adds lots of memory isolation calls) anymore. So thanks to Mel I can
> dump my series in the trashcan :P
> Therefore I believe something like below should be added to the changelog,
> and put to stable as well.

OK, I made it so.

Miraculously, the patch applies OK to 3.14.  And it compiles!
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