mm/zbud: init user ops only when it is needed

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 <[email protected]>
Acked-by: Dan Streetman <[email protected]>
Cc: Seth Jennings <[email protected]>
Cc: Sunae Seo <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/mm/zbud.c b/mm/zbud.c
index ec71b37fb06cc9b9707314857bd8ba0addbb8394..4e387bea702eca644da2547c3bd8f9537291c189 100644 (file)
--- 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)