From: "Manfred Spraul" <manfreds@colorfullife.com>
From: "Andrea Arcangeli" <andrea@suse.de>
To: Andrea Arcangeli <andrea@suse.de>,
"Juan J. Quintela" <quintela@fi.udc.es>
Cc: linux-mm@kvack.org, linux-kernel@vger.rutgers.edu,
trond.myklebust@fys.uio.no
Subject: Re: classzone-VM + mapped pages out of lru_cache
Date: Thu, 4 May 2000 18:34:23 +0200 [thread overview]
Message-ID: <009201bfb5e6$a33b9600$0a1e17ac@local> (raw)
In-Reply-To: <Pine.LNX.4.21.0005041702560.2512-100000@alpha.random>
>
> Because it's not necessary as far I can tell. Only one
> truncate_inode_pages() can run at once and none read or write can run
> under truncate_inode_pages(). This should be enforced by the VFS, and if
> that doesn't happen the truncate_inode_pages changes that gone into pre6
> (and following) hides the real bug.
>
truncate: VFS acquires inode->i_sem semaphore.[fs/open.c, do_truncate()]
write: VFS doesn't acquire the semaphore [new in 2.3], but f_op->write()
could acquire the semaphore.
e.g. generic_file_write() acquires the semaphore. [mm/filemap.c]
read: no locking. AFAICS read & truncate could run in parallel.
[I'm reading 2.3.99-pre6]
--
Manfred
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next prev parent reply other threads:[~2000-05-04 16:34 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-05-03 16:26 Andrea Arcangeli
2000-05-04 0:42 ` David S. Miller
2000-05-04 10:00 ` Andrea Arcangeli
2000-05-04 14:40 ` Juan J. Quintela
2000-05-04 15:19 ` Andrea Arcangeli
2000-05-04 15:23 ` Andrea Arcangeli
2000-05-04 15:38 ` Rik van Riel
2000-05-04 17:59 ` Andrea Arcangeli
2000-05-04 19:24 ` Rik van Riel
2000-05-04 16:34 ` Manfred Spraul, Andrea Arcangeli [this message]
2000-05-04 16:48 ` Trond Myklebust
2000-05-04 18:43 ` Andrea Arcangeli
2000-05-04 19:32 ` Trond Myklebust
2000-05-04 20:15 ` Andrea Arcangeli
2000-05-05 7:01 ` Trond Myklebust
2000-05-04 16:34 ` Juan J. Quintela
2000-05-04 18:27 ` Chris Evans
[not found] <3911ECCD.BA1BB24E@arcormail.de>
2000-05-04 23:44 ` Andrea Arcangeli
2000-05-05 0:03 ` Jens Axboe
2000-05-05 3:04 ` David S. Miller
2000-05-05 8:43 ` Russell King
2000-05-05 14:56 ` Andrea Arcangeli
2000-05-06 13:37 ` Andrea Arcangeli
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