linux-kernel - [PATCH] mm/zsmalloc: avoid unnecessary iteration when freeing size

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Message-Id: <1422107403-10071-1-git-send-email-opensource.ganesh@gmail.com>
Date:	Sat, 24 Jan 2015 21:50:03 +0800
From:	Ganesh Mahendran <opensource.ganesh@...il.com>
To:	minchan@...nel.org, ngupta@...are.org
Cc:	akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Ganesh Mahendran <opensource.ganesh@...il.com>
Subject: [PATCH] mm/zsmalloc: avoid unnecessary iteration when freeing
 size_class

The pool->size_class[i] is assigned with the i from (zs_size_classes - 1) to 0.
So if we failed in zs_create_pool(), we only need to iterate from (zs_size_classes - 1)
to i, instead of from 0 to (zs_size_classes - 1)

Signed-off-by: Ganesh Mahendran <opensource.ganesh@...il.com>
Cc: Nitin Gupta <ngupta@...are.org>
Cc: Minchan Kim <minchan@...nel.org>
---
 mm/zsmalloc.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 16617e9..e6fa3da 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -1433,12 +1433,12 @@ void zs_destroy_pool(struct zs_pool *pool)
 
 	zs_pool_stat_destroy(pool);
 
-	for (i = 0; i < zs_size_classes; i++) {
+	for (i = zs_size_classes - 1; i >= 0; i--) {
 		int fg;
 		struct size_class *class = pool->size_class[i];
 
 		if (!class)
-			continue;
+			break;
 
 		if (class->index != i)
 			continue;
-- 
1.7.9.5

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