From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S936965AbZDJGSG (ORCPT ); Fri, 10 Apr 2009 02:18:06 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1765803AbZDJGQp (ORCPT ); Fri, 10 Apr 2009 02:16:45 -0400 Received: from mga14.intel.com ([143.182.124.37]:28520 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1765682AbZDJGQo (ORCPT ); Fri, 10 Apr 2009 02:16:44 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.40,165,1239001200"; d="scan'208";a="130013466" Message-Id: <20090410061254.052551915@intel.com> References: <20090410060957.442203404@intel.com> User-Agent: quilt/0.46-1 Date: Fri, 10 Apr 2009 14:10:00 +0800 From: Wu Fengguang To: Andrew Morton Cc: LKML , Wu Fengguang Cc: Ying Han Subject: [PATCH 3/9] readahead: remove one unnecessary radix tree lookup Content-Disposition: inline; filename=readahead-interleaved-offset.patch Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org (hit_readahead_marker != 0) means the page at @offset is present, so we can search for non-present page starting from @offset+1. Reported-by: Xu Chenfeng Signed-off-by: Wu Fengguang --- mm/readahead.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- mm.orig/mm/readahead.c +++ mm/mm/readahead.c @@ -395,7 +395,7 @@ ondemand_readahead(struct address_space pgoff_t start; rcu_read_lock(); - start = radix_tree_next_hole(&mapping->page_tree, offset,max+1); + start = radix_tree_next_hole(&mapping->page_tree, offset+1,max); rcu_read_unlock(); if (!start || start - offset > max) --