linux-kernel - Re: [PATCH 2/5] mm, compaction: simplify deferred compaction

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Date:	Thu, 16 Oct 2014 17:11:22 +0200
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Minchan Kim <minchan@...nel.org>, Mel Gorman <mgorman@...e.de>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Michal Nazarewicz <mina86@...a86.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Christoph Lameter <cl@...ux.com>,
	Rik van Riel <riel@...hat.com>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH 2/5] mm, compaction: simplify deferred compaction

On 10/16/2014 12:32 AM, Andrew Morton wrote:
> On Tue,  7 Oct 2014 17:33:36 +0200 Vlastimil Babka <vbabka@...e.cz> wrote:
>> @@ -105,8 +104,7 @@ static inline bool compaction_restarting(struct zone *zone, int order)
>>  static inline unsigned long try_to_compact_pages(struct zonelist *zonelist,
>>  			int order, gfp_t gfp_mask, nodemask_t *nodemask,
>>  			enum migrate_mode mode, int *contended,
>> -			int alloc_flags, int classzone_idx,
>> -			struct zone **candidate_zone)
>> +			int alloc_flags, int classzone_idx);
>>  {
>>  	return COMPACT_CONTINUE;
>>  }
> 
> --- a/include/linux/compaction.h~mm-compaction-simplify-deferred-compaction-fix
> +++ a/include/linux/compaction.h
> @@ -104,7 +104,7 @@ static inline bool compaction_restarting
>  static inline unsigned long try_to_compact_pages(struct zonelist *zonelist,
>  			int order, gfp_t gfp_mask, nodemask_t *nodemask,
>  			enum migrate_mode mode, int *contended,
> -			int alloc_flags, int classzone_idx);
> +			int alloc_flags, int classzone_idx)
>  {
>  	return COMPACT_CONTINUE;
>  }
> 
> It clearly wasn't tested with this config.  Please do so and let us
> know the result?

Sorry, forgot. Hopefully will get better next time, since I learned
about the undertaker/vampyr tool [1] today.

You patch does fix the compilation, thanks. Boot+stress-highalloc tests
are now running through the series but I don't expect any surprises -
the series is basically a no-op with CONFIG_COMPACTION disabled.

[1] http://lwn.net/Articles/616098/
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