From: Andrea Arcangeli <andrea@suse.de>
To: Rik van Riel <riel@conectiva.com.br>
Cc: linux-mm@kvack.org
Subject: Re: filemap.c SMP bug in 2.4.0-test* (fwd)
Date: Fri, 18 Aug 2000 14:49:38 +0200 (CEST) [thread overview]
Message-ID: <Pine.LNX.4.21.0008181443560.18597-100000@inspiron.random> (raw)
In-Reply-To: <Pine.LNX.4.21.0008172017450.16454-100000@duckman.distro.conectiva>
>Proc A Proc B
>page faults
>...
>read_swap_cache_async
> lookup_swap_cache fails twice page faults (same page)
> ...
> read_swap_cache_async
> init of page info (insert in
> hash tables...)
as first on proc B read_swap_cache_async can't be started in between the
second fail of the lookup and the init of the page info and insert
hashtables on proc A, because of the big kernel lock.
> lookup_swap_cache
> __find_page_nolock
> (succeeds, page not active
> activate)
>
The page is inserted locked into the hashtable and lookup_swap_cache uses
find_lock_page so it can't race.
Andrea
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prev parent reply other threads:[~2000-08-18 12:49 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-08-17 23:18 Rik van Riel
2000-08-18 11:50 ` Stephen C. Tweedie
2000-08-18 12:49 ` Andrea Arcangeli [this message]
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