linux-kernel - Re: [PATCH] mm: clear pages_scanned only if draining a pcp adds pages to the buddy allocator again

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Date:	Sat, 16 Jun 2012 08:21:51 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
Cc:	Minchan Kim <minchan@...nel.org>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, akpm@...ux-foundation.org,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>,
	Mel Gorman <mel@....ul.ie>,
	Johannes Weiner <hannes@...xchg.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH] mm: clear pages_scanned only if draining a pcp adds
 pages to the buddy allocator again

On Fri, Jun 15, 2012 at 11:52:34AM -0400, KOSAKI Motohiro wrote:
> (6/15/12 3:19 AM), Minchan Kim wrote:
> >On 06/15/2012 01:16 AM, kosaki.motohiro@...il.com wrote:
> >
> >>From: KOSAKI Motohiro<kosaki.motohiro@...fujitsu.com>
> >>
> >>commit 2ff754fa8f (mm: clear pages_scanned only if draining a pcp adds pages
> >>to the buddy allocator again) fixed one free_pcppages_bulk() misuse. But two
> >>another miuse still exist.
> >>
> >>This patch fixes it.
> >>
> >>Cc: David Rientjes<rientjes@...gle.com>
> >>Cc: Mel Gorman<mel@....ul.ie>
> >>Cc: Johannes Weiner<hannes@...xchg.org>
> >>Cc: Minchan Kim<minchan.kim@...il.com>
> >>Cc: Wu Fengguang<fengguang.wu@...el.com>
> >>Cc: KAMEZAWA Hiroyuki<kamezawa.hiroyu@...fujitsu.com>
> >>Cc: Rik van Riel<riel@...hat.com>
> >>Cc: Andrew Morton<akpm@...ux-foundation.org>
> >>Signed-off-by: KOSAKI Motohiro<kosaki.motohiro@...fujitsu.com>
> >
> >Reviewed-by: Minchan Kim<minchan@...nel.org>
> >
> >Just nitpick.
> >Personally, I want to fix it follwing as
> >It's more simple and reduce vulnerable error in future.
> >
> >If you mind, go ahead with your version. I am not against with it, either.
> 
> I don't like your version because free_pcppages_bulk() can be called from
> free_pages() hotpath. then, i wouldn't like to put a branch if we can avoid it.

Fair enough.

Thanks.
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