linux-kernel - Re: ext3 IO latency measurements (was: Linux 2.6.29)

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Message-ID: <20090326182320.GA9341@nostromo.devel.redhat.com>
Date:	Thu, 26 Mar 2009 14:23:20 -0400
From:	Bill Nottingham <notting@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Theodore Tso <tytso@....edu>, Ingo Molnar <mingo@...e.hu>,
	Jan Kara <jack@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Arjan van de Ven <arjan@...radead.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nick Piggin <npiggin@...e.de>,
	Jens Axboe <jens.axboe@...cle.com>,
	David Rees <drees76@...il.com>, Jesper Krogh <jesper@...gh.cc>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Roland McGrath <roland@...hat.com>
Subject: Re: ext3 IO latency measurements (was: Linux 2.6.29)

Linus Torvalds (torvalds@...ux-foundation.org) said: 
> > Linus Torvalds (torvalds@...ux-foundation.org) said: 
> > > And quite frankly, even if you then _manually_ put 'relatime' in 
> > > /etc/fstab, the default Fedora install will totally ignore it. Why? 
> > > Because it mounts the root partition while using initrd, and totally 
> > > ignores /etc/fstab.
> > 
> > It should honor /etc/fstab changes, if the initramfs is rebuilt
> > after the change is made. If it doesn't, that's a bug.
> 
> Why the hell should I rebuild initramfs? 

Well, it's got to find the root fs options somewhere. Pulling them
from the modified /etc/fstab in the root fs before you mount it, well...

As for why fstab options aren't applied with remount once the root
fs has been mounted, 1) historical reasons 2) someone specifies
'data=writeback' or similar can't-be-applied-with-remount flag in
/etc/fstab, and then mount refuses to remount it at all, and the
system refuses to boot. Arguably pilot error, of course.

Bill
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