From: "Stephen C. Tweedie" <sct@redhat.com>
To: Andrea Arcangeli <andrea@e-mind.com>
Cc: "Stephen C. Tweedie" <sct@redhat.com>,
Zlatko.Calusic@CARNet.hr, Linux-MM List <linux-mm@kvack.org>,
Andi Kleen <andi@zero.aec.at>
Subject: Re: Update shared mappings
Date: Wed, 2 Dec 1998 16:21:01 GMT [thread overview]
Message-ID: <199812021621.QAA04235@dax.scot.redhat.com> (raw)
In-Reply-To: <Pine.LNX.3.96.981201182728.16745C-100000@dragon.bogus>
Hi,
On Tue, 1 Dec 1998 18:48:44 +0100 (CET), Andrea Arcangeli
<andrea@e-mind.com> said:
> No deadlock at all. Are you sure you are using my _latest_ patch in
> arca-39? Some weeks ago I fixed this:
> if (shared->vm_mm == this->vm_mm)
> ^^^^^ ^^^^^
Ah right, I was working from the version Zlatko posted here a week or so
ago. This fix will indeed prevent the instant deadlock.
However, it is still susceptible to deadlock, because in msync() you
now hold the current mm semaphore while trying to take out somebody
else's mm semaphore. If you have two processes doing that to each other
(ie. two processes mapping the same file r/w and doing msyncs), then you
can most certainly still deadlock.
--Stephen
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next prev parent reply other threads:[~1998-12-02 16:22 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-11-20 4:10 Zlatko Calusic
1998-11-30 13:52 ` Stephen C. Tweedie
1998-11-30 15:19 ` Zlatko Calusic
1998-11-30 20:02 ` Andrea Arcangeli
1998-12-01 15:03 ` Stephen C. Tweedie
1998-12-01 17:48 ` Andrea Arcangeli
1998-12-02 16:21 ` Stephen C. Tweedie [this message]
1998-12-02 18:32 ` Andrea Arcangeli
1998-12-03 5:44 ` Eric W. Biederman
1998-12-03 11:56 ` Stephen C. Tweedie
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