linux-kernel - [PATCH 4/4] zsmalloc: zsmalloc: align cache line size

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Message-Id: <1336027242-372-4-git-send-email-minchan@kernel.org>
Date:	Thu,  3 May 2012 15:40:42 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	Nitin Gupta <ngupta@...are.org>,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Minchan Kim <minchan@...nel.org>
Subject: [PATCH 4/4] zsmalloc: zsmalloc: align cache line size

It's a overkill to align pool size with PAGE_SIZE to avoid
false-sharing. This patch aligns it with just cache line size.

Signed-off-by: Minchan Kim <minchan@...nel.org>
---
 drivers/staging/zsmalloc/zsmalloc-main.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/zsmalloc/zsmalloc-main.c b/drivers/staging/zsmalloc/zsmalloc-main.c
index 51074fa..3991b03 100644
--- a/drivers/staging/zsmalloc/zsmalloc-main.c
+++ b/drivers/staging/zsmalloc/zsmalloc-main.c
@@ -489,14 +489,14 @@ fail:
 
 struct zs_pool *zs_create_pool(const char *name, gfp_t flags)
 {
-	int i, error, ovhd_size;
+	int i, error;
 	struct zs_pool *pool;
 
 	if (!name)
 		return NULL;
 
-	ovhd_size = roundup(sizeof(*pool), PAGE_SIZE);
-	pool = kzalloc(ovhd_size, GFP_KERNEL);
+	pool = kzalloc(ALIGN(sizeof(*pool), cache_line_size()),
+				GFP_KERNEL);
 	if (!pool)
 		return NULL;
 
-- 
1.7.9.5

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