linux-kernel - [PATCH v2 2/3] move ClearPageReclaim

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Date:	Mon, 29 Nov 2010 00:02:56 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-mm <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
	Ben Gamari <bgamari.foss@...il.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Rik van Riel <riel@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Nick Piggin <npiggin@...nel.dk>, Mel Gorman <mel@....ul.ie>
Subject: [PATCH v2 2/3] move ClearPageReclaim

fe3cba17 added ClearPageReclaim into clear_page_dirty_for_io for
preventing fast reclaiming readahead marker page.

In this series, PG_reclaim is used by invalidated page, too.
If VM find the page is invalidated and it's dirty, it sets PG_reclaim
to reclaim asap. Then, when the dirty page will be writeback,
clear_page_dirty_for_io will clear PG_reclaim unconditionally.
It disturbs this serie's goal.

I think it's okay to clear PG_readahead when the page is dirty, not
writeback time. So this patch moves ClearPageReadahead.
This patch needs Wu's opinion.

Signed-off-by: Minchan Kim <minchan.kim@...il.com>
Cc: Wu Fengguang <fengguang.wu@...el.com>
Cc: Rik van Riel <riel@...hat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Nick Piggin <npiggin@...nel.dk>
Cc: Mel Gorman <mel@....ul.ie>
---
 fs/buffer.c         |    1 +
 mm/page-writeback.c |    6 +++++-
 2 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/fs/buffer.c b/fs/buffer.c
index 20a41c6..b920086 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -717,6 +717,7 @@ int __set_page_dirty_buffers(struct page *page)
 	int newly_dirty;
 	struct address_space *mapping = page_mapping(page);
 
+	ClearPageReclaim(page);
 	if (unlikely(!mapping))
 		return !TestSetPageDirty(page);
 
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index fc93802..962b0d8 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -1146,6 +1146,7 @@ EXPORT_SYMBOL(write_one_page);
  */
 int __set_page_dirty_no_writeback(struct page *page)
 {
+	ClearPageReclaim(page);
 	if (!PageDirty(page))
 		return !TestSetPageDirty(page);
 	return 0;
@@ -1196,6 +1197,7 @@ EXPORT_SYMBOL(account_page_writeback);
  */
 int __set_page_dirty_nobuffers(struct page *page)
 {
+	ClearPageReclaim(page);
 	if (!TestSetPageDirty(page)) {
 		struct address_space *mapping = page_mapping(page);
 		struct address_space *mapping2;
@@ -1258,6 +1260,8 @@ int set_page_dirty(struct page *page)
 #endif
 		return (*spd)(page);
 	}
+
+	ClearPageReclaim(page);
 	if (!PageDirty(page)) {
 		if (!TestSetPageDirty(page))
 			return 1;
@@ -1280,6 +1284,7 @@ int set_page_dirty_lock(struct page *page)
 {
 	int ret;
 
+	ClearPageReclaim(page);
 	lock_page_nosync(page);
 	ret = set_page_dirty(page);
 	unlock_page(page);
@@ -1307,7 +1312,6 @@ int clear_page_dirty_for_io(struct page *page)
 
 	BUG_ON(!PageLocked(page));
 
-	ClearPageReclaim(page);
 	if (mapping && mapping_cap_account_dirty(mapping)) {
 		/*
 		 * Yes, Virginia, this is indeed insane.
-- 
1.7.0.4

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