From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756305AbZDGMCf (ORCPT ); Tue, 7 Apr 2009 08:02:35 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755555AbZDGMAy (ORCPT ); Tue, 7 Apr 2009 08:00:54 -0400 Received: from mga14.intel.com ([143.182.124.37]:23410 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755328AbZDGMAw (ORCPT ); Tue, 7 Apr 2009 08:00:52 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.39,337,1235980800"; d="scan'208";a="128748891" Message-Id: <20090407115234.657957195@intel.com> References: <20090407115039.780820496@intel.com> User-Agent: quilt/0.46-1 Date: Tue, 07 Apr 2009 19:50:47 +0800 From: Wu Fengguang To: Andrew Morton Cc: Benjamin Herrenschmidt , Wu Fengguang Cc: David Rientjes Cc: Hugh Dickins Cc: Ingo Molnar Cc: Lee Schermerhorn Cc: Mike Waychison Cc: Nick Piggin Cc: Peter Zijlstra Cc: Rohit Seth Cc: Edwin Cc: "H. Peter Anvin" Cc: Ying Han Cc: LKML Cc: Cc: Subject: [PATCH 08/14] 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 @@ -420,7 +420,7 @@ 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) --