From: "Stephen C. Tweedie" <sct@redhat.com>
To: Kanoj Sarcar <kanoj@google.engr.sgi.com>
Cc: "Stephen C. Tweedie" <sct@redhat.com>, linux-mm@kvack.org
Subject: Re: filecache/swapcache questions
Date: Mon, 28 Jun 1999 23:36:35 +0100 (BST) [thread overview]
Message-ID: <14199.63731.189456.865467@dukat.scot.redhat.com> (raw)
In-Reply-To: <199906211846.LAA91751@google.engr.sgi.com>
Hi,
On Mon, 21 Jun 1999 11:46:27 -0700 (PDT), kanoj@google.engr.sgi.com
(Kanoj Sarcar) said:
>> Look no further than swap_in(), which knows that there is no pte (so
>> swapout concurrency is not a problem) and it holds the mmap lock (so
>> there are no concurrent swap_ins on the page). It reads in the page adn
>> unconditionally sets up the pte to point to it, assuming that nobody
>> else can conceivably set the pte while we do the swap outselves.
> Hmm, am I being fooled by the comment in swap_in?
> /*
> * The tests may look silly, but it essentially makes sure that
> * no other process did a swap-in on us just as we were waiting.
> *
afaik only swapoff can trigger that. Concurrent swap-in on the same
entry can occur into the page cache, but not into the page tables
because those are protected by the semaphore.
--Stephen
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next prev parent reply other threads:[~1999-06-28 22:36 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-06-21 5:29 Kanoj Sarcar
1999-06-21 11:25 ` Stephen C. Tweedie
1999-06-21 16:46 ` Kanoj Sarcar
1999-06-21 16:57 ` Stephen C. Tweedie
1999-06-21 17:36 ` Kanoj Sarcar
1999-06-21 17:49 ` Stephen C. Tweedie
1999-06-21 18:46 ` Kanoj Sarcar
1999-06-21 23:44 ` Kanoj Sarcar
1999-06-24 22:23 ` Andrea Arcangeli
1999-06-24 23:55 ` Kanoj Sarcar
1999-06-25 0:26 ` Andrea Arcangeli
1999-06-28 1:48 ` filecache/swapcache questions [RFC] [RFT] [PATCH] kanoj-mm12-2.3.8 Fix swapoff races Kanoj Sarcar
1999-06-28 10:35 ` Andrea Arcangeli
1999-06-28 17:11 ` filecache/swapcache questions [RFC] [RFT] [PATCH] kanoj-mm12-2.3.8 Kanoj Sarcar
1999-06-28 16:32 ` filecache/swapcache questions [RFC] [RFT] [PATCH] kanoj-mm12-2.3.8 Fix swapoff races Stephen C. Tweedie
1999-06-28 17:25 ` Kanoj Sarcar
1999-06-28 20:40 ` Stephen C. Tweedie
1999-06-28 21:11 ` Kanoj Sarcar
1999-06-28 22:12 ` Stephen C. Tweedie
1999-06-28 23:43 ` Kanoj Sarcar
1999-06-29 11:44 ` Stephen C. Tweedie
1999-06-29 22:01 ` Kanoj Sarcar
1999-06-30 17:28 ` Stephen C. Tweedie
1999-06-30 18:05 ` Kanoj Sarcar
1999-06-28 19:39 ` Chuck Lever
1999-06-28 19:55 ` filecache/swapcache questions [RFC] [RFT] [PATCH] kanoj-mm12-2.3.8 Kanoj Sarcar
1999-06-28 20:33 ` Chuck Lever
1999-06-28 20:51 ` Kanoj Sarcar
1999-06-28 21:32 ` Chuck Lever
1999-06-28 21:38 ` Kanoj Sarcar
1999-06-28 21:50 ` Chuck Lever
1999-06-28 22:15 ` Kanoj Sarcar
1999-06-29 11:23 ` Stephen C. Tweedie
1999-06-29 17:36 ` Kanoj Sarcar
1999-06-28 22:22 ` Stephen C. Tweedie
1999-06-28 22:21 ` Stephen C. Tweedie
1999-06-28 22:57 ` Andrea Arcangeli
1999-06-29 2:13 ` Chuck Lever
1999-06-29 12:01 ` Stephen C. Tweedie
1999-06-29 12:32 ` Andrea Arcangeli
1999-06-30 15:59 ` Stephen C. Tweedie
1999-06-29 1:00 ` Chuck Lever
1999-06-28 22:08 ` Stephen C. Tweedie
1999-06-28 22:59 ` Andrea Arcangeli
1999-06-29 0:53 ` Chuck Lever
1999-06-29 11:14 ` Stephen C. Tweedie
1999-06-28 22:09 ` Stephen C. Tweedie
1999-06-28 20:45 ` filecache/swapcache questions [RFC] [RFT] [PATCH] kanoj-mm12-2.3.8 Fix swapoff races Stephen C. Tweedie
1999-06-28 21:14 ` Chuck Lever
1999-06-28 21:25 ` filecache/swapcache questions [RFC] [RFT] [PATCH] kanoj-mm12-2.3.8 Kanoj Sarcar
1999-06-28 22:15 ` filecache/swapcache questions [RFC] [RFT] [PATCH] kanoj-mm12-2.3.8 Fix swapoff races Stephen C. Tweedie
1999-06-28 22:48 ` Andrea Arcangeli
1999-06-29 1:29 ` Chuck Lever
1999-06-29 11:58 ` Stephen C. Tweedie
1999-06-29 12:09 ` Andrea Arcangeli
1999-06-29 15:27 ` Chuck Lever
1999-06-29 11:55 ` Stephen C. Tweedie
1999-06-29 20:08 ` Andrea Arcangeli
1999-06-28 22:36 ` Stephen C. Tweedie [this message]
1999-06-28 23:24 ` filecache/swapcache questions Kanoj Sarcar
-- strict thread matches above, loose matches on Subject: below --
1999-06-15 7:16 Kanoj Sarcar
1999-06-15 7:32 ` Rik van Riel
1999-06-15 15:51 ` Kanoj Sarcar
1999-06-15 20:24 ` Rik van Riel
1999-06-15 21:02 ` Kanoj Sarcar
1999-06-16 20:37 ` Andrea Arcangeli
1999-06-17 23:33 ` Stephen C. Tweedie
1999-06-18 0:20 ` Kanoj Sarcar
1999-06-18 17:00 ` Stephen C. Tweedie
1999-06-18 17:03 ` Kanoj Sarcar
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