linux-kernel - [PATCH 01 of 66] disable lumpy when compaction is enabled

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Date:	Wed, 03 Nov 2010 16:27:36 +0100
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	linux-mm@...ck.org, Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Cc:	Marcelo Tosatti <mtosatti@...hat.com>, Adam Litke <agl@...ibm.com>,
	Avi Kivity <avi@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mel@....ul.ie>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ingo Molnar <mingo@...e.hu>, Mike Travis <travis@....com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Chris Wright <chrisw@...s-sol.org>, bpicco@...hat.com,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Chris Mason <chris.mason@...cle.com>,
	Borislav Petkov <bp@...en8.de>
Subject: [PATCH 01 of 66] disable lumpy when compaction is enabled

From: Andrea Arcangeli <aarcange@...hat.com>

Compaction is more reliable than lumpy, and lumpy makes the system unusable
when it runs.

Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
---

diff --git a/mm/vmscan.c b/mm/vmscan.c
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -274,6 +274,7 @@ unsigned long shrink_slab(unsigned long 
 static void set_lumpy_reclaim_mode(int priority, struct scan_control *sc,
 				   bool sync)
 {
+#ifndef CONFIG_COMPACTION
 	enum lumpy_mode mode = sync ? LUMPY_MODE_SYNC : LUMPY_MODE_ASYNC;
 
 	/*
@@ -294,11 +295,14 @@ static void set_lumpy_reclaim_mode(int p
 		sc->lumpy_reclaim_mode = mode;
 	else
 		sc->lumpy_reclaim_mode = LUMPY_MODE_NONE;
+#endif
 }
 
 static void disable_lumpy_reclaim_mode(struct scan_control *sc)
 {
+#ifndef CONFIG_COMPACTION
 	sc->lumpy_reclaim_mode = LUMPY_MODE_NONE;
+#endif
 }
 
 static inline int is_page_cache_freeable(struct page *page)
@@ -321,9 +325,11 @@ static int may_write_to_queue(struct bac
 	if (bdi == current->backing_dev_info)
 		return 1;
 
+#ifndef CONFIG_COMPACTION
 	/* lumpy reclaim for hugepage often need a lot of write */
 	if (sc->order > PAGE_ALLOC_COSTLY_ORDER)
 		return 1;
+#endif
 	return 0;
 }
 
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