From: david@lang.hm Subject: Re: [RFC] Parallelize IO for e2fsck Date: Tue, 29 Jan 2008 00:29:28 -0800 (PST) Message-ID: References: <70b6f0bf0801161322k2740a8dch6a0d6e6e112cd2d0@mail.gmail.com> <70b6f0bf0801161330y46ec555m5d4994a1eea7d045@mail.gmail.com> <20080121230041.GL3180@webber.adilger.int> <20080122033830.GR155259@sgi.com> <3673.1200975438@turing-police.cc.vt.edu> <20080122070050.GM3180@webber.adilger.int> <20080122144052.GC17804@mit.edu> <20080128193005.GC4032@ucw.cz> <20080128195633.GB20528@mit.edu> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Cc: Pavel Machek , Valdis.Kletnieks@vt.edu, David Chinner , Valerie Henson , linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, Andreas Dilger , Ric Wheeler To: Theodore Tso Return-path: Received: from dsl081-033-126.lax1.dsl.speakeasy.net ([64.81.33.126]:51819 "EHLO bifrost.lang.hm" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751196AbYA2HSM (ORCPT ); Tue, 29 Jan 2008 02:18:12 -0500 In-Reply-To: <20080128195633.GB20528@mit.edu> Sender: linux-ext4-owner@vger.kernel.org List-ID: On Mon, 28 Jan 2008, Theodore Tso wrote: > On Mon, Jan 28, 2008 at 07:30:05PM +0000, Pavel Machek wrote: >> >> As user pages are always in highmem, this should be easy to decide: >> only send SIGDANGER when highmem is full. (Yes, there are >> inodes/dentries/file descriptors in lowmem, but I doubt apps will >> respond to SIGDANGER by closing files). > > Good point; for a system with at least (say) 2GB of memory, that > definitely makes sense. For a system with less than 768 megs of > memory (how quaint, but it wasn't that long ago this was a lot of > memory :-), there wouldn't *be* any memory in highmem at all.... not to mention machines with 1G of ram (900M lowmem, 128M highmem) David Lang