From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753873AbZGPIjX (ORCPT ); Thu, 16 Jul 2009 04:39:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753554AbZGPIjX (ORCPT ); Thu, 16 Jul 2009 04:39:23 -0400 Received: from fgwmail7.fujitsu.co.jp ([192.51.44.37]:57286 "EHLO fgwmail7.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753266AbZGPIjW (ORCPT ); Thu, 16 Jul 2009 04:39:22 -0400 X-SecurityPolicyCheck-FJ: OK by FujitsuOutboundMailChecker v1.3.1 From: KOSAKI Motohiro To: LKML Subject: [PATCH 3/5] Kill unnecessary prefetch Cc: kosaki.motohiro@jp.fujitsu.com, linux-mm , Andrew Morton In-Reply-To: <20090716173449.9D4B.A69D9226@jp.fujitsu.com> References: <20090716173449.9D4B.A69D9226@jp.fujitsu.com> Message-Id: <20090716173848.9D51.A69D9226@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Mailer: Becky! ver. 2.50.07 [ja] Date: Thu, 16 Jul 2009 17:39:19 +0900 (JST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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);