From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763295AbXGUD75 (ORCPT ); Fri, 20 Jul 2007 23:59:57 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757274AbXGUD66 (ORCPT ); Fri, 20 Jul 2007 23:58:58 -0400 Received: from smtp.ustc.edu.cn ([202.38.64.16]:54632 "HELO ustc.edu.cn" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with SMTP id S1755441AbXGUD6y (ORCPT ); Fri, 20 Jul 2007 23:58:54 -0400 Message-ID: <384990324.22217@ustc.edu.cn> X-EYOUMAIL-SMTPAUTH: wfg@mail.ustc.edu.cn Message-Id: <20070721035850.977231489@mail.ustc.edu.cn> References: <20070721035733.951838089@mail.ustc.edu.cn> User-Agent: quilt/0.45-1 Date: Sat, 21 Jul 2007 11:57:34 +0800 From: Fengguang Wu To: Linus Torvalds Cc: Andrew Morton , linux-kernel@vger.kernel.org, Andi Kleen Subject: [PATCH 1/8] compacting file_ra_state Content-Disposition: inline; filename=short-rasize.patch Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Use 'unsigned int' instead of 'unsigned long' for readahead sizes. This helps reduce memory consumption on 64bit CPU when a lot of files are opened. CC: Andi Kleen Signed-off-by: Fengguang Wu --- include/linux/fs.h | 8 ++++---- mm/readahead.c | 2 +- 2 files changed, 5 insertions(+), 5 deletions(-) --- linux-2.6.22-git15.orig/include/linux/fs.h +++ linux-2.6.22-git15/include/linux/fs.h @@ -697,12 +697,12 @@ struct fown_struct { * Track a single file's readahead state */ struct file_ra_state { - pgoff_t start; /* where readahead started */ - unsigned long size; /* # of readahead pages */ - unsigned long async_size; /* do asynchronous readahead when + pgoff_t start; /* where readahead started */ + unsigned int size; /* # of readahead pages */ + unsigned int async_size; /* do asynchronous readahead when there are only # of pages ahead */ - unsigned long ra_pages; /* Maximum readahead window */ + unsigned int ra_pages; /* Maximum readahead window */ unsigned long mmap_hit; /* Cache hit stat for mmap accesses */ unsigned long mmap_miss; /* Cache miss stat for mmap accesses */ unsigned long prev_index; /* Cache last read() position */ --- linux-2.6.22-git15.orig/mm/readahead.c +++ linux-2.6.22-git15/mm/readahead.c @@ -350,7 +350,7 @@ ondemand_readahead(struct address_space bool hit_readahead_marker, pgoff_t offset, unsigned long req_size) { - unsigned long max; /* max readahead pages */ + int max; /* max readahead pages */ int sequential; max = ra->ra_pages; --