linux-kernel - [PATCH 3/5] Kill unnecessary prefetch

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Message-Id: <20090716173848.9D51.A69D9226@jp.fujitsu.com>
Date:	Thu, 16 Jul 2009 17:39:19 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	kosaki.motohiro@...fujitsu.com, linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 3/5]  Kill unnecessary prefetch

Subject: Kill unnecessary prefetch

The pages in the list passed move_active_pages_to_lru() are
already touched by shrink_active_list(). IOW the prefetch in
move_active_pages_to_lru() don't populate any cache. it's pointless.

This patch remove it.


Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
---
 mm/vmscan.c |    1 -
 1 file changed, 1 deletion(-)

Index: b/mm/vmscan.c
===================================================================
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1225,7 +1225,6 @@ static void move_active_pages_to_lru(str
 
 	while (!list_empty(list)) {
 		page = lru_to_page(list);
-		prefetchw_prev_lru_page(page, list, flags);
 
 		VM_BUG_ON(PageLRU(page));
 		SetPageLRU(page);


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