linux-kernel - Re: [patch v4 4/6] mm, compaction: embed migration mode in compact

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Date:	Fri, 9 May 2014 15:03:31 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Vlastimil Babka <vbabka@...e.cz>, Mel Gorman <mgorman@...e.de>,
	Rik van Riel <riel@...hat.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Greg Thelen <gthelen@...gle.com>,
	Hugh Dickins <hughd@...gle.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [patch v4 4/6] mm, compaction: embed migration mode in
 compact_control

On Wed, 7 May 2014 03:36:46 -0700 (PDT) David Rientjes <rientjes@...gle.com> wrote:

> We're going to want to manipulate the migration mode for compaction in the page 
> allocator, and currently compact_control's sync field is only a bool.  
> 
> Currently, we only do MIGRATE_ASYNC or MIGRATE_SYNC_LIGHT compaction depending 
> on the value of this bool.  Convert the bool to enum migrate_mode and pass the 
> migration mode in directly.  Later, we'll want to avoid MIGRATE_SYNC_LIGHT for 
> thp allocations in the pagefault patch to avoid unnecessary latency.
> 
> This also alters compaction triggered from sysfs, either for the entire system 
> or for a node, to force MIGRATE_SYNC.

mm/page_alloc.c: In function 'alloc_contig_range':
mm/page_alloc.c:6255: error: unknown field 'sync' specified in initializer

--- a/mm/page_alloc.c~mm-compaction-embed-migration-mode-in-compact_control-fix
+++ a/mm/page_alloc.c
@@ -6252,7 +6252,7 @@ int alloc_contig_range(unsigned long sta
 		.nr_migratepages = 0,
 		.order = -1,
 		.zone = page_zone(pfn_to_page(start)),
-		.sync = MIGRATE_SYNC_LIGHT,
+		.mode = MIGRATE_SYNC_LIGHT,
 		.ignore_skip_hint = true,
 	};
 	INIT_LIST_HEAD(&cc.migratepages);


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