linux-kernel - [patch -mm 2/3] mm, compaction: pass gfp mask to compact

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Date:	Tue, 3 Jun 2014 17:29:58 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Vlastimil Babka <vbabka@...e.cz>, Mel Gorman <mgorman@...e.de>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Hugh Dickins <hughd@...gle.com>,
	Greg Thelen <gthelen@...gle.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Minchan Kim <minchan@...nel.org>,
	Michal Nazarewicz <mina86@...a86.com>,
	Rik van Riel <riel@...hat.com>
Subject: [patch -mm 2/3] mm, compaction: pass gfp mask to compact_control

struct compact_control currently converts the gfp mask to a migratetype, but we 
need the entire gfp mask in a follow-up patch.

Pass the entire gfp mask as part of struct compact_control.

Signed-off-by: David Rientjes <rientjes@...gle.com>
---
 mm/compaction.c | 12 +++++++-----
 mm/internal.h   |  2 +-
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/mm/compaction.c b/mm/compaction.c
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -883,8 +883,8 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone,
 	return ISOLATE_SUCCESS;
 }
 
-static int compact_finished(struct zone *zone,
-			    struct compact_control *cc)
+static int compact_finished(struct zone *zone, struct compact_control *cc,
+			    const int migratetype)
 {
 	unsigned int order;
 	unsigned long watermark;
@@ -930,7 +930,7 @@ static int compact_finished(struct zone *zone,
 		struct free_area *area = &zone->free_area[order];
 
 		/* Job done if page is free of the right migratetype */
-		if (!list_empty(&area->free_list[cc->migratetype]))
+		if (!list_empty(&area->free_list[migratetype]))
 			return COMPACT_PARTIAL;
 
 		/* Job done if allocation would set block type */
@@ -996,6 +996,7 @@ static int compact_zone(struct zone *zone, struct compact_control *cc)
 	int ret;
 	unsigned long start_pfn = zone->zone_start_pfn;
 	unsigned long end_pfn = zone_end_pfn(zone);
+	const int migratetype = gfpflags_to_migratetype(cc->gfp_mask);
 	const bool sync = cc->mode != MIGRATE_ASYNC;
 
 	ret = compaction_suitable(zone, cc->order);
@@ -1038,7 +1039,8 @@ static int compact_zone(struct zone *zone, struct compact_control *cc)
 
 	migrate_prep_local();
 
-	while ((ret = compact_finished(zone, cc)) == COMPACT_CONTINUE) {
+	while ((ret = compact_finished(zone, cc, migratetype)) ==
+						COMPACT_CONTINUE) {
 		int err;
 
 		switch (isolate_migratepages(zone, cc)) {
@@ -1096,7 +1098,7 @@ static unsigned long compact_zone_order(struct zone *zone, int order,
 		.nr_freepages = 0,
 		.nr_migratepages = 0,
 		.order = order,
-		.migratetype = gfpflags_to_migratetype(gfp_mask),
+		.gfp_mask = gfp_mask,
 		.zone = zone,
 		.mode = mode,
 	};
diff --git a/mm/internal.h b/mm/internal.h
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -142,7 +142,7 @@ struct compact_control {
 	bool finished_update_migrate;
 
 	int order;			/* order a direct compactor needs */
-	int migratetype;		/* MOVABLE, RECLAIMABLE etc */
+	const gfp_t gfp_mask;		/* gfp mask of a direct compactor */
 	struct zone *zone;
 	bool contended;			/* True if a lock was contended, or
 					 * need_resched() true during async
--
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