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Message-id: <20080122070511.GN3180@webber.adilger.int> Date: Tue, 22 Jan 2008 00:05:11 -0700 From: Andreas Dilger <adilger@....com> To: David Chinner <dgc@....com> Cc: Valerie Henson <val@...consulting.com>, linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org, Theodore Ts'o <tytso@....edu>, Andreas Dilger <adilger@...sterfs.com>, Ric Wheeler <ric@....com> Subject: Re: [RFC] Parallelize IO for e2fsck On Jan 22, 2008 14:38 +1100, David Chinner wrote: > On Mon, Jan 21, 2008 at 04:00:41PM -0700, Andreas Dilger wrote: > > I discussed this with Ted at one point also. This is a generic problem, > > not just for readahead, because "fsck" can run multiple e2fsck in parallel > > and in case of many large filesystems on a single node this can cause > > memory usage problems also. > > > > What I was proposing is that "fsck.{fstype}" be modified to return an > > estimated minimum amount of memory needed, and some "desired" amount of > > memory (i.e. readahead) to fsck the filesystem, using some parameter like > > "fsck.{fstype} --report-memory-needed /dev/XXX". If this does not > > return the output in the expected format, or returns an error then fsck > > will assume some amount of memory based on the device size and continue > > as it does today. > > And while fsck is running, some other program runs that uses > memory and blows your carefully calculated paramters to smithereens? Well, fsck has a rather restricted working environment, because it is run before most other processes start (i.e. single-user mode). For fsck initiated by an admin in other runlevels the admin would need to specify the upper limit of memory usage. My proposal was only for the single-user fsck at boot time. Cheers, Andreas -- Andreas Dilger Sr. Staff Engineer, Lustre Group Sun Microsystems of Canada, Inc. - To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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