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From: Joe Korty <joe.korty@ccur.com>
To: Andrew Morton <akpm@osdl.org>
Cc: linux-kernel@vger.kernel.org, riel@redhat.com, andrea@suse.de
Subject: Re: mlockall and mmap of IO devices don't mix
Date: Fri, 3 Oct 2003 18:55:09 -0400 [thread overview]
Message-ID: <20031003225509.GA26590@rudolph.ccur.com> (raw)
In-Reply-To: <20031003152349.7194b73d.akpm@osdl.org>
On Fri, Oct 03, 2003 at 03:23:49PM -0700, Andrew Morton wrote:
> Joe Korty <joe.korty@ccur.com> wrote:
> >
> > 2.6.0-test6: the use of mlockall(2) in a process that has mmap(2)ed
> > the registers of an IO device will hang that process uninterruptibly.
> > The task runs in an infinite loop in get_user_pages(), invoking
> > follow_page() forever.
>
> whoops.
>
> I think the right fix is in get_user_pages(): if the region is VM_IO then
> don't call follow_page() at all.
>
> Something like this?
Sigh. No go; it *looks* good but my app still locks up....
Regards,
Joe
next prev parent reply other threads:[~2003-10-03 22:56 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-03 21:44 Joe Korty
2003-10-03 22:23 ` Andrew Morton
2003-10-03 22:55 ` Joe Korty [this message]
2003-10-03 23:06 ` Andrew Morton
2003-10-03 23:28 ` Joe Korty
2003-10-03 23:15 ` Andrew Morton
2003-10-03 23:54 ` Joe Korty
2003-10-04 0:27 ` Andrew Morton
2003-10-04 5:47 ` David S. Miller
2003-10-04 9:29 ` Ingo Oeser
2004-05-21 11:34 ` Mark Hounschell
2004-05-22 2:13 ` Andrew Morton
2004-05-22 10:47 ` Mark Hounschell
2004-05-23 12:58 ` Mark Hounschell
2004-05-25 14:27 ` Joe Korty
2004-05-25 19:47 ` Andrew Morton
2004-05-25 21:31 ` Joe Korty
2004-07-16 21:01 ` Mark Hounschell
[not found] <CFYv.787.23@gated-at.bofh.it>
2003-10-04 7:02 ` Andi Kleen
2003-10-04 7:42 ` Andrew Morton
2003-10-04 8:29 ` Andi Kleen
2003-10-04 8:47 ` Ingo Oeser
2003-10-04 9:17 ` Andi Kleen
2003-10-04 9:22 ` Russell King
2003-10-04 10:02 ` Ingo Oeser
2003-10-04 10:13 ` Russell King
2003-10-04 14:19 ` Ingo Oeser
2003-10-04 14:32 ` Martin J. Bligh
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