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

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Message-ID: <20070805134645.GD4246@unthought.net>
Date:	Sun, 5 Aug 2007 15:46:45 +0200
From:	Jakob Oestergaard <jakob@...hought.net>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Jeff Garzik <jeff@...zik.org>,
	Linus Torvalds <torvalds@...ux-foundation.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

On Sun, Aug 05, 2007 at 02:46:48PM +0200, Ingo Molnar wrote:
> 
> * Jakob Oestergaard <jakob@...hought.net> wrote:
> 
> > > If you can show massive amounts of users that will actually be 
> > > negatively impacted, please present hard evidence.
> > > 
> > > Otherwise all this is useless hot air.
> > 
> > Peace Jeff :)
> > 
> > In another mail, I gave an example with tmpreaper clearing out unused 
> > files; if some of those files are only read and never modified, 
> > tmpreaper would start deleting files which were still frequently used.
> > 
> > That's a regression, the way I see it. As for 'massive amounts of 
> > users', well, tmpreaper exists in most distros, so it's possible it 
> > has other users than just me.
> 
> you mean tmpwatch?

Same same.

> The trivial change below fixes this. And with that 
> we've come to the end of an extremely short list of atime dependencies.

Please read what I wrote, not what you think I wrote.

If I only *read* those files, the mtime will not be updated, only the
atime.

And the files *will* then magically begin to disappear although they are
frequently used.

That will happen with a standard piece of software in a standard
configuration, in a scenario that may or may not be common... I have no
idea how common such a setup is - but I know how much it would suck to
have files magically disappearing because of a kernel upgrade  :)

-- 

 / jakob

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