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

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Message-ID: <alpine.LFD.2.00.0903261523060.3032@localhost.localdomain>
Date:	Thu, 26 Mar 2009 15:24:55 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Bill Nottingham <notting@...hat.com>
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)



On Thu, 26 Mar 2009, Bill Nottingham wrote:
> 
> 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...

Umm.

The _only_ sane thng to do is to mount the root read-only from initramfs, 
and then re-mount it with the options in the /etc/fstab later when you 
re-mount it read-write _anyway_ (which may possibly be immediately, of 
course).

Anybody who thinks you should re-write initramfs for something like this 
really hasn't spent a single second thinking about it.

		Linus
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