linux-kernel - Re: [PATCH 09/19] mm: page_alloc: Use word-based accesses for get/set pageblock bitmaps

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Message-Id: <20140522112357.4715059bb69273f40c3ec4f2@linux-foundation.org>
Date:	Thu, 22 May 2014 11:23:57 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Vlastimil Babka <vbabka@...e.cz>
Cc:	Mel Gorman <mgorman@...e.de>, Joonsoo Kim <iamjoonsoo.kim@....com>,
	Johannes Weiner <hannes@...xchg.org>, Jan Kara <jack@...e.cz>,
	Michal Hocko <mhocko@...e.cz>, Hugh Dickins <hughd@...gle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Dave Hansen <dave.hansen@...el.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>,
	Linux-FSDevel <linux-fsdevel@...r.kernel.org>
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 <vbabka@...e.cz> 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 <mgorman@...e.de>
> > Acked-by: Vlastimil Babka <vbabka@...e.cz>
> 
> Hi, I've tested if this closes the race I've been previously trying to fix
> with the series in http://marc.info/?l=linux-mm&m=139359694028925&w=2
> 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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