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From: Mel Gorman <mgorman@suse.de>
To: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	linux-next@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: linux-next: manual merge of the akpm tree with Linus' tree
Date: Wed, 22 Aug 2012 09:58:01 +0100
Message-ID: <20120822085801.GA15058@suse.de> (raw)
In-Reply-To: <20120822155941.ae0b4c163fc15346a9863e5e@canb.auug.org.au>

On Wed, Aug 22, 2012 at 03:59:41PM +1000, Stephen Rothwell wrote:
> Hi Andrew,
> 
> Today's linux-next merge of the akpm tree got a conflict in
> mm/page_alloc.c between commit c67fe3752abe ("mm: compaction: Abort async
> compaction if locks are contended or taking too long") from Linus' tree
> and commit "mm: remove __GFP_NO_KSWAPD" from the akpm tree.
> 
> I fixed it up (see below) and can carry the fix as necessary.

Hi Stephen,

I think this will be a temporary problem. In the patch series that contained
"mm: compaction: Abort async compaction if locks are contended or taking
too long" there is a replacement patch for "mm: remove __GFP_NO_KSWAPD"
that handles the conflict. According to the mm-commits mailing list the
replacement patch has been picked up by Andrew but I see the old
versions in linux-next/akpm. It should get resolved the next time
Andrews tree gets pushed out.

> diff --cc mm/page_alloc.c
> index 5b3cc33,cefac39..0000000
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@@ -2436,11 -2429,10 +2435,10 @@@ rebalance
>   	/*
>   	 * If compaction is deferred for high-order allocations, it is because
>   	 * sync compaction recently failed. In this is the case and the caller
>  -	 * has requested the system not be heavily disrupted, fail the
>  -	 * allocation now instead of entering direct reclaim
>  +	 * requested a movable allocation that does not heavily disrupt the
>  +	 * system then fail the allocation instead of entering direct reclaim.
>   	 */
> - 	if ((deferred_compaction || contended_compaction) &&
> - 						(gfp_mask & __GFP_NO_KSWAPD))
>  -	if (deferred_compaction)
> ++	if (deferred_compaction || contended_compaction)
>   		goto nopage;
>   
>   	/* Try direct reclaim and then allocating */

It is not obvious at all but the correct resolution is actually the
following. Andrew should already have the right version.

@@ -2437,7 +2436,7 @@ rebalance:
 	 * system then fail the allocation instead of entering direct reclaim.
 	 */
 	if ((deferred_compaction || contended_compaction) &&
-						(gfp_mask & __GFP_NO_KSWAPD))
+	    (gfp_mask & (__GFP_MOVABLE|__GFP_REPEAT)) == __GFP_MOVABLE)
 		goto nopage;
 
 	/* Try direct reclaim and then allocating */

-- 
Mel Gorman
SUSE Labs

  reply index

Thread overview: 106+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-08-22  5:59 Stephen Rothwell
2012-08-22  8:58 ` Mel Gorman [this message]
  -- strict thread matches above, loose matches on Subject: below --
2019-12-02  2:17 Stephen Rothwell
2019-12-02  2:08 Stephen Rothwell
2018-10-15  7:22 Stephen Rothwell
2018-10-15  7:04 Stephen Rothwell
2018-03-26  8:56 Stephen Rothwell
2017-01-09  2:51 Stephen Rothwell
2016-12-12  5:49 Stephen Rothwell
2016-01-19  2:42 Stephen Rothwell
2016-01-19  2:36 Stephen Rothwell
2015-07-27  5:26 Stephen Rothwell
2013-09-10  4:38 Stephen Rothwell
2013-09-10 22:27 ` Andrew Morton
2013-09-10 22:29   ` Al Viro
2013-09-10 22:35     ` Andrew Morton
2013-09-10 22:36       ` Al Viro
2013-09-10 22:39         ` Al Viro
2013-09-10 22:41         ` Andrew Morton
2013-09-10 22:48           ` Al Viro
2013-09-10 22:59             ` Al Viro
2013-09-10 23:13               ` Andrew Morton
2013-09-10 23:55                 ` Al Viro
2013-09-11  4:30                 ` Stephen Rothwell
2013-09-10 23:37               ` Linus Torvalds
2013-09-10 23:53                 ` Al Viro
2013-09-11  0:01                   ` Linus Torvalds
2013-09-11  0:39                     ` Dave Chinner
2013-09-13  0:56                 ` Linus Torvalds
2013-09-13  1:12                   ` Linus Torvalds
2013-09-13  1:35                     ` Al Viro
2013-09-13 19:12                     ` Linus Torvalds
2013-09-13 19:28                       ` Linus Torvalds
2013-09-13 19:54                       ` Linus Torvalds
2013-09-13 20:00                       ` Al Viro
2013-09-13 20:18                         ` Al Viro
2013-09-13 20:23                           ` Al Viro
2013-09-13 20:25                         ` Linus Torvalds
2013-09-13 20:31                           ` Linus Torvalds
2013-09-13 20:31                           ` Al Viro
2013-09-13 20:34                             ` Linus Torvalds
2013-09-10 22:35   ` Linus Torvalds
2013-09-10 22:44     ` Andrew Morton
2013-09-11  0:30       ` Stephen Rothwell
2013-09-11  0:41         ` Linus Torvalds
2013-09-10  4:21 Stephen Rothwell
2013-09-10  4:09 Stephen Rothwell
2013-09-10  4:12 ` Stephen Rothwell
2013-09-09  5:38 Stephen Rothwell
2013-09-09  5:22 Stephen Rothwell
2013-09-09  5:16 Stephen Rothwell
2013-08-30  8:44 Stephen Rothwell
2013-05-27  6:20 Stephen Rothwell
2013-05-20  4:04 Stephen Rothwell
2013-05-20 12:19 ` Chris Mason
2013-05-13  5:20 Eric Paris
2013-05-13  2:07 Stephen Rothwell
2013-05-13  2:11 ` Eric Paris
2013-05-13  4:16   ` Stephen Rothwell
2013-05-13  4:49   ` Kees Cook
2013-05-13  5:14     ` Eric Paris
2013-05-02  6:01 Stephen Rothwell
2013-04-29  8:38 Stephen Rothwell
2013-04-19  7:40 Stephen Rothwell
2013-04-16  7:25 Stephen Rothwell
2013-04-03  6:10 Stephen Rothwell
2013-03-25  4:22 Stephen Rothwell
2013-03-04  2:21 Stephen Rothwell
2013-01-04  3:27 Stephen Rothwell
2012-12-11  5:25 Stephen Rothwell
2012-12-11  5:22 Stephen Rothwell
2012-12-11  7:58 ` Glauber Costa
2012-12-07  6:39 Stephen Rothwell
2012-11-30  6:24 Stephen Rothwell
2012-11-26 12:52 Stephen Rothwell
2012-11-26 12:48 Stephen Rothwell
2012-11-26 13:25 ` Xiaotian Feng
2012-11-26 12:34 Stephen Rothwell
2012-10-15  2:07 Stephen Rothwell
2012-10-15 22:14 ` Catalin Marinas
2012-10-01 14:15 Stephen Rothwell
2012-07-27  3:57 Stephen Rothwell
2012-07-02  6:39 Stephen Rothwell
2012-06-04  4:58 Stephen Rothwell
2012-05-31  4:24 Stephen Rothwell
2012-05-31  4:13 Stephen Rothwell
2012-05-31  7:25 ` Johannes Weiner
2012-05-31  8:24   ` Stephen Rothwell
2012-05-31  8:27     ` Stephen Rothwell
2012-05-21  8:23 Stephen Rothwell
2012-05-21  8:13 Stephen Rothwell
2012-05-21  8:16 ` Cyrill Gorcunov
2012-03-08  6:53 Stephen Rothwell
2012-03-08  7:32 ` Andrew Morton
2012-03-08  7:41   ` Stephen Rothwell
2012-03-08  7:50     ` Andrew Morton
2012-03-08  7:50       ` Xiao Guangrong
2012-03-08  9:59       ` Xiao Guangrong
2012-03-08 21:24         ` Andrew Morton
2012-03-08 23:42           ` Linus Torvalds
2011-12-28  7:54 Stephen Rothwell
2011-11-08  3:24 Stephen Rothwell
2011-11-01  8:16 Stephen Rothwell
2011-11-01 10:47 ` Tao Ma
2011-09-16  6:09 Stephen Rothwell
2011-08-15  4:52 Stephen Rothwell

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