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

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Message-ID: <20090401235937.GA6131@nowhere>
Date:	Thu, 2 Apr 2009 01:59:39 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Bron Gondwana <brong@...tmail.fm>
Cc:	Ingo Molnar <mingo@...e.hu>, Jeff Mahoney <jeffm@...e.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	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

On Thu, Apr 02, 2009 at 09:18:50AM +1100, Bron Gondwana wrote:
> On Wed, Apr 01, 2009 at 06:51:36PM +0200, Frederic Weisbecker wrote:
> > > 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 :)
> > 
> > Hehe :-)
> > No actually I would accept a tiny slowdown but I fear that the common
> > reiserfs users wouldn't.
> 
> We run big(ish) imap servers with up to 80 reiserfs partitions
> spread over a bunch of SCSI or SAS attached external drive units.
> I'm actually surprised that the BKL isn't causing us much pain
> (load is amazingly low considering how many users are on these
> boxes - at least now that we have 32Gb RAM and 64 bit kernels).
>
> Are you still using an "entire reiserfs subsystem" mutex, or
> per-filesystem locking?  If it's per filesystem, then I suspect
> we'll be big fans!



Yeah. It is per superblock :-)

Frederic.


>  
> > I'm still working on this and once it's ready enough for an RFC patch,
> > I'll explain how is done the conversion to a mutex.
> > 
> > Stay tuned.
> 
> Sure will!
> 
> Thanks,
> 
> Bron.

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