linux-kernel - Re: [PATCH 07/11] Memory compaction core

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Message-ID: <20100323185800.GG5870@csn.ul.ie>
Date:	Tue, 23 Mar 2010 18:58:00 +0000
From:	Mel Gorman <mel@....ul.ie>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Minchan Kim <minchan.kim@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 07/11] Memory compaction core

On Tue, Mar 23, 2010 at 01:33:19PM -0500, Christoph Lameter wrote:
> On Tue, 23 Mar 2010, Mel Gorman wrote:
> 
> > I can if you prefer but it's so small, I didn't think it obscured the
> > clarity of the patch anyway. I would have somewhat expected the two
> > patches to be merged together before going upstream.
> 
> It exposes the definitions needed to run __isolate_lru_page(). The
> definitions could be useful for other uses of page migrations.
> 

Sure. Patch split out now and looks like

=== CUT HERE ===
Subject: [PATCH 07/12] Move definition for LRU isolation modes to a header

Currently, vmscan.c defines the isolation modes for
__isolate_lru_page(). Memory compaction needs access to these modes for
isolating pages for migration.  This patch exports them.

Signed-off-by: Mel Gorman <mel@....ul.ie>
---
 include/linux/swap.h |    5 +++++
 mm/vmscan.c          |    5 -----
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/include/linux/swap.h b/include/linux/swap.h
index 1f59d93..986b12d 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -238,6 +238,11 @@ static inline void lru_cache_add_active_file(struct page *page)
 	__lru_cache_add(page, LRU_ACTIVE_FILE);
 }
 
+/* LRU Isolation modes. */
+#define ISOLATE_INACTIVE 0	/* Isolate inactive pages. */
+#define ISOLATE_ACTIVE 1	/* Isolate active pages. */
+#define ISOLATE_BOTH 2		/* Isolate both active and inactive pages. */
+
 /* linux/mm/vmscan.c */
 extern unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
 					gfp_t gfp_mask, nodemask_t *mask);
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 79c8098..ef89600 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -839,11 +839,6 @@ keep:
 	return nr_reclaimed;
 }
 
-/* LRU Isolation modes. */
-#define ISOLATE_INACTIVE 0	/* Isolate inactive pages. */
-#define ISOLATE_ACTIVE 1	/* Isolate active pages. */
-#define ISOLATE_BOTH 2		/* Isolate both active and inactive pages. */
-
 /*
  * Attempt to remove the specified page from its LRU.  Only take this page
  * if it is of the appropriate PageActive status.  Pages which are being
-- 
1.6.5

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