From: Jens Axboe <jaxboe@fusionio.com>
Date: Mon, 19 Apr 2010 08:04:38 +0000 (+0200)
Subject: read-ahead: use plugging
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=5b417b1873694ece3291d7f64a943304559a817b;p=deliverable%2Flinux.git

read-ahead: use plugging

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
---

diff --git a/mm/readahead.c b/mm/readahead.c
index cbddc3e17246..2c0cc489e288 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -109,9 +109,12 @@ EXPORT_SYMBOL(read_cache_pages);
 static int read_pages(struct address_space *mapping, struct file *filp,
 		struct list_head *pages, unsigned nr_pages)
 {
+	struct blk_plug plug;
 	unsigned page_idx;
 	int ret;
 
+	blk_start_plug(&plug);
+
 	if (mapping->a_ops->readpages) {
 		ret = mapping->a_ops->readpages(filp, mapping, pages, nr_pages);
 		/* Clean up the remaining pages */
@@ -129,7 +132,10 @@ static int read_pages(struct address_space *mapping, struct file *filp,
 		page_cache_release(page);
 	}
 	ret = 0;
+
 out:
+	blk_finish_plug(&plug);
+
 	return ret;
 }