From: "Stephen C. Tweedie" <sct@redhat.com>
To: Andrea Arcangeli <andrea@suse.de>
Cc: Alexander Viro <viro@math.psu.edu>,
Manfred Spraul <manfreds@colorfullife.com>,
linux-kernel@vger.rutgers.edu,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Stephen Tweedie <sct@redhat.com>
Subject: Re: locking question: do_mmap(), do_munmap()
Date: Mon, 11 Oct 1999 16:05:31 +0100 (BST) [thread overview]
Message-ID: <14337.64699.741408.60931@dukat.scot.redhat.com> (raw)
In-Reply-To: <Pine.LNX.4.10.9910091758380.5808-100000@alpha.random>
Hi,
On Sat, 9 Oct 1999 18:01:27 +0200 (CEST), Andrea Arcangeli
<andrea@suse.de> said:
> On Sat, 9 Oct 1999, Alexander Viro wrote:
>> do_munmap() doesn't need the big lock. do_mmap() callers should grab
> Look the swapout path. Without the big kernel lock you'll free vmas under
> swap_out().
Yes. The swapout code relies on the big lock to freeze the vma, and on
the page_table_lock to protect the ptes, so that it can avoid worrying
about the mm_sem at all.
If munmap ever drops vmas without the big lock, the swapper _will_
break. Making this into a per-mm lock would not be hard, btw.
--Stephen
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next prev parent reply other threads:[~1999-10-11 15:05 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-10-09 12:48 Manfred Spraul
1999-10-09 13:12 ` Alexander Viro
1999-10-09 13:17 ` Manfred Spraul
1999-10-09 13:38 ` Alexander Viro
1999-10-09 16:01 ` Andrea Arcangeli
1999-10-10 13:05 ` Manfred Spraul
1999-10-11 15:09 ` Stephen C. Tweedie
1999-10-11 15:05 ` Stephen C. Tweedie [this message]
[not found] <Pine.LNX.4.10.9910101713010.364-100000@alpha.random>
1999-10-10 15:52 ` Manfred Spraul
1999-10-10 16:07 ` Alexander Viro
1999-10-10 16:25 ` Alexander Viro
1999-10-10 16:45 ` Manfred Spraul
1999-10-10 17:25 ` Alexander Viro
1999-10-10 17:12 ` Andrea Arcangeli
1999-10-10 17:48 ` Alexander Viro
1999-10-10 18:42 ` Manfred Spraul
1999-10-10 19:03 ` Alexander Viro
1999-10-10 21:31 ` Manfred Spraul
1999-10-10 21:53 ` Andrea Arcangeli
1999-10-10 22:34 ` Alexander Viro
1999-10-10 23:28 ` Andrea Arcangeli
1999-10-11 15:50 ` Stephen C. Tweedie
1999-10-11 16:05 ` Alexander Viro
1999-10-11 18:02 ` Manfred Spraul
1999-10-11 19:07 ` Kanoj Sarcar
1999-10-11 22:23 ` Stephen C. Tweedie
1999-10-13 1:25 ` Kanoj Sarcar
1999-10-13 7:32 ` Manfred Spraul
1999-10-15 9:58 ` Ralf Baechle
1999-10-15 17:50 ` Kanoj Sarcar
1999-10-13 10:45 ` Stephen C. Tweedie
1999-10-11 20:15 ` Stephen C. Tweedie
1999-10-11 21:14 ` Manfred Spraul
1999-10-11 21:37 ` Alexander Viro
1999-10-11 22:13 ` Manfred Spraul
1999-10-11 22:22 ` Stephen C. Tweedie
1999-10-11 23:01 ` Alexander Viro
1999-10-13 10:16 ` Stephen C. Tweedie
1999-10-11 20:13 ` Stephen C. Tweedie
1999-10-11 21:40 ` Alexander Viro
1999-10-11 22:20 ` Stephen C. Tweedie
1999-10-11 22:31 ` Alexander Viro
1999-10-13 10:25 ` Stephen C. Tweedie
1999-10-11 15:47 ` Stephen C. Tweedie
1999-10-11 15:43 ` Stephen C. Tweedie
1999-10-10 16:56 ` Andrea Arcangeli
1999-10-11 15:41 ` Stephen C. Tweedie
1999-10-11 15:52 ` Alexander Viro
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