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

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Date:	Mon, 2 Nov 2009 12:29:02 +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 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. 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?
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