linux-kernel - Re: [patch 00/35] Jeff's ReiserFS Patch Queue

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Message-ID: <20090401163407.GE22517@elte.hu>
Date:	Wed, 1 Apr 2009 18:34:07 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeff Mahoney <jeffm@...e.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	ReiserFS Development List <reiserfs-devel@...r.kernel.org>
Subject: Re: [patch 00/35] Jeff's ReiserFS Patch Queue


* Jeff Mahoney <jeffm@...e.com> wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Ingo Molnar wrote:
> > * Linus Torvalds <torvalds@...ux-foundation.org> wrote:
> > 
> >>> Once this is applied, I expect reiserfs to be in deep 
> >>> maintenance-only mode.
> >> Heh, I hadn't expected even this.
> > 
> > Note, there are BKL-removal patches in the works by Frédéric 
> > Weisbecker, for the tip:kill-the-BKL topic branch.
> > 
> > Reiser3 is the heaviest (and most non-trivial) BKL user amongst all 
> > the filesystems, its BKL use is recursive and it frequently relies 
> > on the implicit dropping of the BKL at various blocking points both 
> > for correctness and for performance reasons.
> > 
> > There might be something worth posting+reviewing soon.
> 
> Oh interesting. I'm glad someone is working on this. I've started 
> to several times and decided to focus my efforts on things outside 
> of reiserfs instead. The reiserfs usage of the BKL has always been 
> a black mark.

I'll let Frederic describe it but AFAIK the patch is working fine 
with the BKL as a mutex and no lockdep complaints or lockups. The 
main focus is now on finding the performance affecting spots, 
because Frederic's main desktop is on reiserfs and he does not 
accept a slowdown :)

	Ingo
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