linux-kernel - Re: [PATCH 00/27] Push down BKL to the filesystems (v2)

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Message-Id: <200911021629.06520.borntraeger@de.ibm.com>
Date:	Mon, 2 Nov 2009 16:29:06 +0100
From:	Christian Borntraeger <borntraeger@...ibm.com>
To:	Jan Blunck <jblunck@...e.de>
Cc:	linux-fsdevel@...r.kernel.org, Matthew Wilcox <matthew@....cx>,
	linux-kernel@...r.kernel.org, Chris Mason <chris.mason@...cle.com>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 00/27] Push down BKL to the filesystems (v2)

Am Montag 02 November 2009 14:30:42 schrieb Jan Blunck:
> On Mon, Nov 02, Christian Borntraeger wrote:
> > Am Montag 02 November 2009 11:04:40 schrieb Jan Blunck:
> > > During the realtime preemption mini-summit we discussed the entire
> > > removal of the big kernel lock. I've started working on this for some
> > > filesystems. My plan is to push the BKL down to the implementations
> > > first and remove it from there later.
> > >
> > > This series is pushing the BKL from do_new_mount() down to the
> > > filesystems and removes it from ext series of filesystems and one other
> > > trivial use: if the BKL is only used in get_sb/fill_super due to the
> > > push-down, we just need to make sure that parallel calls to
> > > get_sb/fill_super would race against each other.
> >
> > seems that patch 1 (the pushdown) did not yet made it to the list.
> 
> Seems that the CC list was too long because I used get_maintainer.pl
>  together with git-send-email on this patch ...
> 
> > Looking at
> > you diffstat it seems that you only touched fs/*
> >
> > There are filesystems in other places, e.g.
> > drivers/isdn/capi/capifs.c,
> > arch/powerpc/platforms/cell/spufs/inode.c
> > or
> > arch/s390/hypfs/inode.c
> >
> > I am really not an expert in filesystems, so my comment might be bogus:
> > My expection was, that a simple pushdown should also affect these
> > filesystems, especially if the filesystems dont use simple_fill_super,
> > no?
> 
> D'Oh! You are totally correct. Seems that nothing important outside of fs/
> actually requires the BKL since my box is still wor
> 














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