From: Heesub Shin <heesub.shin@samsung.com>
To: Dan Streetman <ddstreet@ieee.org>,
        Seth Jennings <sjennings@variantweb.net>,
        Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        Sunae Seo <sunae.seo@samsung.com>,
        Heesub Shin <heesub.shin@samsung.com>
Subject: [PATCH] mm/zbud: init user ops only when it is needed
Date: Wed, 15 Oct 2014 19:00:43 +0900
Message-id: <1413367243-23524-1-git-send-email-heesub.shin@samsung.com>
DLP-Filter: Pass
Sender: linux-kernel-owner@vger.kernel.org

When zbud is initialized through the zpool wrapper, pool->ops which
points to user-defined operations is always set regardless of whether it
is specified from the upper layer. This causes zbud_reclaim_page() to
iterate its loop for evicting pool pages out without any gain.

This patch sets the user-defined ops only when it is needed, so that
zbud_reclaim_page() can bail out the reclamation loop earlier if there
is no user-defined operations specified.

Signed-off-by: Heesub Shin <heesub.shin@samsung.com>
---
 mm/zbud.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/zbud.c b/mm/zbud.c
index ecf1dbe..db8de74 100644
--- a/mm/zbud.c
+++ b/mm/zbud.c
@@ -132,7 +132,7 @@ static struct zbud_ops zbud_zpool_ops = {
 
 static void *zbud_zpool_create(gfp_t gfp, struct zpool_ops *zpool_ops)
 {
-	return zbud_create_pool(gfp, &zbud_zpool_ops);
+	return zbud_create_pool(gfp, zpool_ops ? &zbud_zpool_ops : NULL);
 }
 
 static void zbud_zpool_destroy(void *pool)
-- 
1.9.1

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