linux-kernel - Re: [PATCH 00/23] per device dirty throttling -v8

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Message-ID: <20070805193231.GA21928@elte.hu>
Date:	Sun, 5 Aug 2007 21:32:31 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jakob Oestergaard <jakob@...hought.net>,
	Jeff Garzik <jeff@...zik.org>, miklos@...redi.hu,
	akpm@...ux-foundation.org, neilb@...e.de, dgc@....com,
	tomoki.sekiyama.qu@...achi.com,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, linux-mm@...ck.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	nikita@...sterfs.com, trond.myklebust@....uio.no,
	yingchao.zhou@...il.com, richard@....demon.co.uk, david@...g.hm
Subject: Re: [PATCH 00/23] per device dirty throttling -v8


* Alan Cox <alan@...rguk.ukuu.org.uk> wrote:

> > also add the CONFIG_DEFAULT_RELATIME kernel option, which makes 
> > "norelatime" the default for all mounts without an extra kernel boot 
> > option.
> 
> Should be a mount option.

it is already a mount option too.

> > +	relatime        [FS] default to enabled relatime updates on all
> > +			filesystems.
> > +
> > +	relatime=       [FS] default to enabled/disabled relatime updates on
> > +			all filesystems.
> > +
> 
> Double patch

no - it was not a double patch, i made all the common variants valid 
boot options: "relatime", "relatime=0/1", "norelatime" and 
"norelatime=0/1". Anyway, this is mooth, in the latest (v2) version 
there's only a single boot parameter.

> > +config DEFAULT_RELATIME
> > +	bool "Mount all filesystems with relatime by default"
> > +	default y
> 
> Changes behaviour so probably should default n. Better yet it should 
> be the mount option so its flexible and strongly encouraged for 
> vendors.

relatime is a mount option already. And distros can disable it if they 
want. (they are conscious about their kernel config selections anyway.)

> > +0
> > +#endif
> > +;
> 
> This ifdef mess would go away for a mount option

i fixed that in v2.

	Ingo
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