From: Jeff Moyer <jmoyer@redhat.com>
To: Jan Kara <jack@suse.cz>
Cc: Nick Piggin <npiggin@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
linux-kernel@vger.kernel.org
Subject: Re: [patch] fs: aio fix rcu lookup
Date: Wed, 19 Jan 2011 14:46:27 -0500 [thread overview]
Message-ID: <x49aaiwd6cs.fsf@segfault.boston.devel.redhat.com> (raw)
In-Reply-To: <x49ei88d7vl.fsf@segfault.boston.devel.redhat.com> (Jeff Moyer's message of "Wed, 19 Jan 2011 14:13:34 -0500")
Jeff Moyer <jmoyer@redhat.com> writes:
> Jan Kara <jack@suse.cz> writes:
>
>> But there's the second race I describe making it possible
>> for new IO to be created after io_destroy() has waited for all IO to
>> finish...
>
> Can't that be solved by introducing memory barriers around the accesses
> to ->dead?
Upon further consideration, I don't think so.
Given the options, I think adding the synchronize rcu to the io_destroy
path is the best way forward. You're already waiting for a bunch of
queued I/O to finish, so there is no guarantee that you're going to
finish that call quickly.
Cheers,
Jeff
next prev parent reply other threads:[~2011-01-19 19:46 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-14 1:35 [patch] fs: aio fix rcu lookup Nick Piggin
2011-01-14 14:52 ` Jeff Moyer
2011-01-14 15:00 ` Nick Piggin
2011-01-17 19:07 ` Jeff Moyer
2011-01-17 23:24 ` Nick Piggin
2011-01-18 17:21 ` Jeff Moyer
2011-01-18 19:01 ` Jan Kara
2011-01-18 22:17 ` Nick Piggin
2011-01-18 23:00 ` Jeff Moyer
2011-01-18 23:05 ` Nick Piggin
2011-01-18 23:52 ` Jan Kara
2011-01-19 0:20 ` Nick Piggin
2011-01-19 13:21 ` Jan Kara
2011-01-19 16:03 ` Nick Piggin
2011-01-19 16:50 ` Jan Kara
2011-01-19 17:37 ` Nick Piggin
2011-01-20 20:21 ` Jan Kara
2011-01-19 19:13 ` Jeff Moyer
2011-01-19 19:46 ` Jeff Moyer [this message]
2011-01-19 20:18 ` Nick Piggin
2011-01-19 20:32 ` Jeff Moyer
2011-01-19 20:45 ` Nick Piggin
2011-01-19 21:03 ` Jeff Moyer
2011-01-19 21:20 ` Nick Piggin
2011-01-20 4:03 ` Paul E. McKenney
2011-01-20 18:31 ` Nick Piggin
2011-01-20 20:02 ` Paul E. McKenney
2011-01-20 20:15 ` Eric Dumazet
2011-01-21 21:22 ` Paul E. McKenney
2011-01-20 20:16 ` Jan Kara
2011-01-20 21:16 ` Jeff Moyer
2011-02-01 16:24 ` Jan Kara
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