linux-kernel - Re: [PATCH V4 3/4] mm: reduce try_to_compact

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Date:	Wed, 07 Jan 2015 10:11:45 +0100
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Michal Hocko <mhocko@...e.cz>
CC:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Mel Gorman <mgorman@...e.de>,
	Zhang Yanfei <zhangyanfei@...fujitsu.com>,
	Minchan Kim <minchan@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH V4 3/4] mm: reduce try_to_compact_pages parameters

On 01/06/2015 03:57 PM, Michal Hocko wrote:
> Hmm, wait a minute
> 
> On Mon 05-01-15 18:17:42, Vlastimil Babka wrote:
> [...]
>> -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)
>> +unsigned long try_to_compact_pages(gfp_t gfp_mask, unsigned int order,
>> +			int alloc_flags, const struct alloc_context *ac,
>> +			enum migrate_mode mode, int *contended)
>>  {
>> -	enum zone_type high_zoneidx = gfp_zone(gfp_mask);
>>  	int may_enter_fs = gfp_mask & __GFP_FS;
>>  	int may_perform_io = gfp_mask & __GFP_IO;
>>  	struct zoneref *z;
> 
> gfp_mask might change since the high_zoneidx was set up in the call
> chain. I guess this shouldn't change to the gfp_zone output but it is
> worth double checking.

Yeah I checked that. gfp_zone() operates just on GFP_ZONEMASK part of the flags,
and we don't change that.

>> @@ -1365,8 +1363,8 @@ unsigned long try_to_compact_pages(struct zonelist *zonelist,
>>  		return COMPACT_SKIPPED;
>>  
>>  	/* Compact each zone in the list */
>> -	for_each_zone_zonelist_nodemask(zone, z, zonelist, high_zoneidx,
>> -								nodemask) {
>> +	for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, ac->high_zoneidx,
>> +								ac->nodemask) {
>>  		int status;
>>  		int zone_contended;
>>  
> 

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