linux-kernel - [RFC PATCH 03/10] mm/compaction: always update cached pfn

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Date:	Thu, 25 Jun 2015 09:45:14 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Vlastimil Babka <vbabka@...e.cz>, Mel Gorman <mgorman@...e.de>,
	Rik van Riel <riel@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Minchan Kim <minchan@...nel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: [RFC PATCH 03/10] mm/compaction: always update cached pfn

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
---
 mm/compaction.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/mm/compaction.c b/mm/compaction.c
index 9c5d43c..2d8e211 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -510,6 +510,10 @@ isolate_fail:
 	if (locked)
 		spin_unlock_irqrestore(&cc->zone->lock, flags);
 
+	if (blockpfn == end_pfn &&
+		blockpfn > cc->zone->compact_cached_free_pfn)
+		cc->zone->compact_cached_free_pfn = blockpfn;
+
 	update_pageblock_skip(cc, valid_page, total_isolated,
 			*start_pfn, end_pfn, blockpfn, false);
 
@@ -811,6 +815,13 @@ isolate_success:
 	if (locked)
 		spin_unlock_irqrestore(&zone->lru_lock, flags);
 
+	if (low_pfn == end_pfn && cc->mode != MIGRATE_ASYNC) {
+		int sync = cc->mode != MIGRATE_ASYNC;
+
+		if (low_pfn > zone->compact_cached_migrate_pfn[sync])
+			zone->compact_cached_migrate_pfn[sync] = low_pfn;
+	}
+
 	update_pageblock_skip(cc, valid_page, nr_isolated,
 			start_pfn, end_pfn, low_pfn, true);
 
-- 
1.9.1

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