From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752565Ab2LTGVt (ORCPT ); Thu, 20 Dec 2012 01:21:49 -0500 Received: from mail-da0-f42.google.com ([209.85.210.42]:49242 "EHLO mail-da0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752048Ab2LTGVn (ORCPT ); Thu, 20 Dec 2012 01:21:43 -0500 Subject: Re: resend--[PATCH] improve read ahead in kernel From: Simon Jeons To: Eric Wong Cc: xtu4 , linux-kernel@vger.kernel.org, linux-tip-commits@vger.kernel.org, linux-mm@kvack.org, di.zhang@intel.com In-Reply-To: <20121216021508.GA3629@dcvr.yhbt.net> References: <50C4B4E7.60601@intel.com> <50C6AB45.606@intel.com> <20121216021508.GA3629@dcvr.yhbt.net> Content-Type: text/plain; charset="UTF-8" Date: Thu, 20 Dec 2012 01:20:35 -0500 Message-ID: <1355984435.1374.3.camel@kernel-VirtualBox> Mime-Version: 1.0 X-Mailer: Evolution 2.32.2 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 2012-12-16 at 02:15 +0000, Eric Wong wrote: > xtu4 wrote: > > resend it, due to format error > > > > Subject: [PATCH] when system in low memory scenario, imaging there is a mp3 > > play, ora video play, we need to read mp3 or video file > > from memory to page cache,but when system lack of memory, > > page cache of mp3 or video file will be reclaimed.once read > > in memory, then reclaimed, it will cause audio or video > > glitch,and it will increase the io operation at the same > > time. > > To me, this basically describes how POSIX_FADV_NOREUSE should work. Hi Eric, But why fadvise POSIX_FADV_NOREUSE almost do nothing? Why not set some flag or other things for these use once data? > I would like to have this ability via fadvise (and not CONFIG_). > > Also, I think your patch has too many #ifdefs to be accepted. > > -- > To unsubscribe, send a message with 'unsubscribe linux-mm' in > the body to majordomo@kvack.org. For more info on Linux MM, > see: http://www.linux-mm.org/ . > Don't email: email@kvack.org