linux-kernel - [PATCH 2/2] mm: make do_writepages() use plugging

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Date:	Fri,  3 Feb 2012 18:57:06 +0530
From:	Amit Sahrawat <amit.sahrawat83@...il.com>
To:	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Johannes Weiner <jweiner@...hat.com>
Cc:	Amit Sahrawat <a.sahrawat@...sung.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Amit Sahrawat <amit.sahrawat83@...il.com>
Subject: [PATCH 2/2] mm: make do_writepages() use plugging

This will cover all the invocations for writepages to be called with
plugging support.

Signed-off-by: Amit Sahrawat <a.sahrawat@...sung.com>
---
 mm/page-writeback.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 363ba70..2bea32c 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -1866,14 +1866,18 @@ EXPORT_SYMBOL(generic_writepages);
 
 int do_writepages(struct address_space *mapping, struct writeback_control *wbc)
 {
+	struct blk_plug plug;
 	int ret;
 
 	if (wbc->nr_to_write <= 0)
 		return 0;
+
+	blk_start_plug(&plug);
 	if (mapping->a_ops->writepages)
 		ret = mapping->a_ops->writepages(mapping, wbc);
 	else
 		ret = generic_writepages(mapping, wbc);
+	blk_finish_plug(&plug);
 	return ret;
 }
 
-- 
1.7.2.3

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