linux-kernel - [patch] mm, compaction: ignore pageblock skip when manually invoking compaction

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Message-ID: <alpine.DEB.2.02.1401222154220.7503@chino.kir.corp.google.com>
Date:	Wed, 22 Jan 2014 21:56:31 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [patch] mm, compaction: ignore pageblock skip when manually invoking
 compaction

The cached pageblock hint should be ignored when triggering compaction
through /proc/sys/vm/compact_memory so all eligible memory is isolated.  
Manually invoking compaction is known to be expensive, there's no need to
skip pageblocks based on heuristics (mainly for debugging).

Signed-off-by: David Rientjes <rientjes@...gle.com>
---
 mm/compaction.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/compaction.c b/mm/compaction.c
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1177,6 +1177,7 @@ static void compact_node(int nid)
 	struct compact_control cc = {
 		.order = -1,
 		.sync = true,
+		.ignore_skip_hint = true,
 	};
 
 	__compact_pgdat(NODE_DATA(nid), &cc);
--
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