From: Jonathan Corbet <corbet@lwn.net>
To: Andi Kleen <andi@firstfloor.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, andi@firstfloor.org,
viro@ZenIV.linux.org.uk, oleg@redhat.com,
linux-api@vger.kernel.org, alan@lxorguk.ukuu.org.uk
Subject: Re: [PATCH, RFC] Remove fasync() BKL usage, take 3325
Date: Thu, 22 Jan 2009 22:21:41 -0700 [thread overview]
Message-ID: <20090122222141.4a9501e1@tpl> (raw)
In-Reply-To: <20090122160935.GI15750@one.firstfloor.org>
On Thu, 22 Jan 2009 17:09:35 +0100
Andi Kleen <andi@firstfloor.org> wrote:
> > OK, replacing a lock_kernel() with a spin_lock(&global_lock) is
> > pretty straightforwad. But it's really really sad. It basically
> > leaves a great big FIXME in there. It'd be better to fix it.
>
> Also it might be that it's even worse than the BKL.
I don't quite see how now. Like the BKL, it's a spinlock.
> It would still require a bitlock because some state in the low
> level fasync needs to be protected.
>
> Oleg has a proposal to do this using a flag bit which seemed
> reasonable to me.
I didn't see a reason to add a one-off custom locking regime for such a
non-hot-path situation. But it would certainly work; if we want to go
that way I'll not fight it.
jon
next prev parent reply other threads:[~2009-01-23 5:21 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-15 22:32 [PATCH, RFC] Remove fasync() BKL usage, take 3325 Jonathan Corbet
2009-01-22 14:51 ` Andrew Morton
2009-01-22 16:09 ` Andi Kleen
2009-01-23 5:21 ` Jonathan Corbet [this message]
2009-01-22 20:32 ` Christoph Hellwig
2009-01-23 4:56 ` Andi Kleen
2009-01-28 0:53 ` Andrew Morton
2009-01-28 0:55 ` Andrew Morton
2009-01-28 3:14 ` Oleg Nesterov
2009-01-28 3:57 ` Jonathan Corbet
2009-01-28 4:23 ` Oleg Nesterov
2009-01-28 14:13 ` Jonathan Corbet
2009-01-28 17:36 ` Christoph Hellwig
2009-01-28 17:44 ` Jonathan Corbet
2009-01-28 17:55 ` Christoph Hellwig
2009-01-28 18:13 ` Matt Mackall
2009-01-28 21:05 ` Jonathan Corbet
2009-01-28 18:14 ` David Daney
2009-01-29 14:37 ` Andi Kleen
2009-01-23 5:15 ` Jonathan Corbet
2009-01-23 5:31 ` Andrew Morton
2009-01-23 5:45 ` Matt Mackall
2009-01-23 6:15 ` Andi Kleen
2009-01-23 10:45 ` Bernd Petrovitsch
2009-01-23 5:54 ` Andi Kleen
2009-01-23 6:01 ` Jonathan Corbet
2009-01-23 6:57 ` Andrew Morton
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