From: "Stephen C. Tweedie" <sct@redhat.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: "Stephen C. Tweedie" <sct@redhat.com>,
mingo@elte.hu, Andrea Arcangeli <andrea@suse.de>,
Marcelo Tosatti <marcelo@conectiva.com.br>,
Linus Torvalds <torvalds@transmeta.com>,
Rik van Riel <riel@conectiva.com.br>,
Roger Larsson <roger.larsson@norran.net>,
MM mailing list <linux-mm@kvack.org>,
linux-kernel@vger.kernel.org
Subject: Re: the new VMt
Date: Mon, 25 Sep 2000 18:43:38 +0100 [thread overview]
Message-ID: <20000925184338.L2615@redhat.com> (raw)
In-Reply-To: <E13dbTq-0005Gg-00@the-village.bc.nu>; from alan@lxorguk.ukuu.org.uk on Mon, Sep 25, 2000 at 05:51:49PM +0100
Hi,
On Mon, Sep 25, 2000 at 05:51:49PM +0100, Alan Cox wrote:
> > > 2 active processes, no swap
> > >
> > > #1 #2
> > > kmalloc 32K kmalloc 16K
> > > OK OK
> > > kmalloc 16K kmalloc 32K
> > > block block
> > >
> >
> > ... and we get two wakeup_kswapd()s. kswapd has PF_MEMALLOC and so is
> > able to eat memory which processes #1 and #2 are not allowed to touch.
>
> 'no swap'
kswapd is perfectly capable of evicting clean pages and triggering any
necessary writeback of dirty filesystem data at this point, even if
there is no swap. If there is truly nothing kswapd can do to recover
here, then we are truly OOM. Otherwise, kswapd should be able to free
the required memory, providing that the PF_MEMALLOC flag allows it to
eat into a reserved set of free pages which nobody else can allocate
once physical free pages gets below a certain threshold.
--Stephen
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next prev parent reply other threads:[~2000-09-25 17:43 UTC|newest]
Thread overview: 243+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-09-24 10:11 __GFP_IO && shrink_[d|i]cache_memory()? Ingo Molnar
2000-09-24 18:11 ` Linus Torvalds
2000-09-24 18:40 ` Ingo Molnar
2000-09-24 18:39 ` Linus Torvalds
2000-09-24 18:46 ` Linus Torvalds
2000-09-24 18:59 ` Ingo Molnar
2000-09-24 19:34 ` [patch] vmfixes-2.4.0-test9-B2 Ingo Molnar
2000-09-24 20:20 ` Rui Sousa
2000-09-24 20:24 ` Andrea Arcangeli
2000-09-24 20:26 ` Ingo Molnar
2000-09-24 21:12 ` Andrea Arcangeli
2000-09-24 21:12 ` Ingo Molnar
2000-09-24 21:43 ` Stephen C. Tweedie
2000-09-24 22:13 ` Andrea Arcangeli
2000-09-24 22:36 ` [patch] vmfixes-2.4.0-test9-B2 - fixing deadlocks bert hubert
2000-09-24 23:41 ` Andrea Arcangeli
2000-09-25 16:24 ` Stephen C. Tweedie
2000-09-25 17:03 ` Andrea Arcangeli
2000-09-25 18:06 ` Stephen C. Tweedie
2000-09-25 19:32 ` Andrea Arcangeli
2000-09-25 19:26 ` Rik van Riel
2000-09-25 22:28 ` Andrea Arcangeli
2000-09-25 22:26 ` Rik van Riel
2000-09-25 22:51 ` Andrea Arcangeli
2000-09-25 22:30 ` Linus Torvalds
2000-09-25 23:03 ` Andrea Arcangeli
2000-09-25 23:18 ` Linus Torvalds
2000-09-26 0:32 ` Andrea Arcangeli
2000-09-25 22:30 ` Juan J. Quintela
2000-09-25 23:00 ` Andrea Arcangeli
2000-09-25 19:54 ` Stephen C. Tweedie
2000-09-25 22:44 ` Andrea Arcangeli
2000-09-25 22:42 ` Rik van Riel
2000-09-26 6:54 ` Christoph Rohland
2000-09-26 14:05 ` Andrea Arcangeli
2000-09-26 16:20 ` Christoph Rohland
2000-09-26 17:10 ` Andrea Arcangeli
2000-09-27 8:11 ` Christoph Rohland
2000-09-27 8:28 ` Ingo Molnar
2000-09-27 9:24 ` Christoph Rohland
2000-09-27 13:56 ` Andrea Arcangeli
2000-09-27 16:56 ` Christoph Rohland
2000-09-27 17:42 ` Andrea Arcangeli
2000-09-27 18:25 ` Erik Andersen
2000-09-27 18:55 ` Andrea Arcangeli
2000-09-28 10:08 ` Rik van Riel
2000-09-28 11:16 ` Rik van Riel
2000-09-28 14:52 ` Andrea Arcangeli
2000-09-29 14:39 ` Rik van Riel
2000-09-29 14:55 ` Andrea Arcangeli
2000-09-29 15:40 ` Rik van Riel
2000-09-28 11:31 ` Ingo Molnar
2000-09-28 14:54 ` Andrea Arcangeli
2000-09-28 15:13 ` Ingo Molnar
2000-09-28 15:23 ` Andrea Arcangeli
2000-09-28 16:16 ` Juan J. Quintela
2000-09-28 14:31 ` Andrea Arcangeli
2000-09-25 17:21 ` bert hubert
2000-09-25 17:49 ` Andrea Arcangeli
2000-09-25 15:09 ` Miles Lane
2000-09-25 15:51 ` Stephen C. Tweedie
2000-09-25 16:05 ` Ingo Molnar
2000-09-25 16:06 ` Alexander Viro
2000-09-25 16:20 ` Ingo Molnar
2000-09-25 16:29 ` Andrea Arcangeli
2000-09-25 4:56 ` [patch] vmfixes-2.4.0-test9-B2 Linus Torvalds
2000-09-25 5:19 ` Alexander Viro
2000-09-25 6:06 ` Linus Torvalds
2000-09-25 6:17 ` Alexander Viro
2000-09-25 21:21 ` Alexander Viro
2000-09-26 13:42 ` [CFT][PATCH] ext2 directories in pagecache Alexander Viro
2000-09-26 21:29 ` Alexander Viro
2000-09-26 22:16 ` Marko Kreen
2000-09-26 22:31 ` Alexander Viro
2000-09-26 22:47 ` Marko Kreen
2000-09-27 7:32 ` Ingo Molnar
2000-09-27 9:22 ` Alexander Viro
2000-09-26 23:19 ` Andreas Dilger
2000-09-26 23:33 ` Alexander Viro
2000-09-26 23:44 ` Alexander Viro
2000-09-25 0:09 ` [patch] vmfixes-2.4.0-test9-B2 Linus Torvalds
2000-09-25 0:49 ` Alexander Viro
2000-09-25 0:53 ` Marcelo Tosatti
2000-09-25 1:45 ` Andrea Arcangeli
2000-09-25 2:39 ` Marcelo Tosatti
2000-09-25 15:36 ` Andrea Arcangeli
2000-09-25 10:42 ` the new VM Ingo Molnar
2000-09-25 13:02 ` Andrea Arcangeli
2000-09-25 13:02 ` Ingo Molnar
2000-09-25 13:08 ` Andrea Arcangeli
2000-09-25 13:12 ` Ingo Molnar
2000-09-25 13:30 ` Andrea Arcangeli
2000-09-25 13:39 ` Ingo Molnar
2000-09-25 14:04 ` Andrea Arcangeli
2000-09-25 14:04 ` Ingo Molnar
2000-09-25 14:23 ` Andrea Arcangeli
2000-09-25 14:27 ` Ingo Molnar
2000-09-25 14:39 ` Andrea Arcangeli
2000-09-25 14:43 ` Ingo Molnar
2000-09-25 15:01 ` Andrea Arcangeli
2000-09-25 15:10 ` Ingo Molnar
2000-09-25 15:24 ` Andrea Arcangeli
2000-09-25 15:26 ` Ingo Molnar
2000-09-25 15:22 ` yodaiken
2000-09-26 19:10 ` Pavel Machek
2000-09-26 20:16 ` Andrea Arcangeli
2000-09-27 7:42 ` Ingo Molnar
2000-09-27 12:11 ` yodaiken
2000-09-27 14:08 ` Andrea Arcangeli
2000-09-25 16:09 ` Rik van Riel
2000-09-25 14:26 ` Marcelo Tosatti
2000-09-25 14:50 ` Andrea Arcangeli
2000-09-25 14:47 ` Alan Cox
2000-09-25 15:16 ` Ingo Molnar
2000-09-25 15:16 ` the new VMt Alan Cox
2000-09-25 15:33 ` the new VM Ingo Molnar
2000-09-25 15:41 ` the new VMt Andrea Arcangeli
2000-09-25 16:02 ` Ingo Molnar
2000-09-25 16:04 ` Andi Kleen
2000-09-25 16:19 ` Ingo Molnar
2000-09-25 16:18 ` Andi Kleen
2000-09-25 16:41 ` Andrea Arcangeli
2000-09-25 16:35 ` Linus Torvalds
2000-09-25 16:41 ` Rik van Riel
2000-09-25 16:49 ` Linus Torvalds
2000-09-25 17:03 ` Ingo Molnar
2000-09-25 17:17 ` Andrea Arcangeli
2000-09-25 17:10 ` Rik van Riel
2000-09-25 17:27 ` Andrea Arcangeli
2000-09-25 17:15 ` Andrea Arcangeli
2000-09-27 7:14 ` Rusty Russell
2000-09-25 20:23 ` Russell King
2000-09-25 16:28 ` Rik van Riel
2000-09-25 16:11 ` Andrea Arcangeli
2000-09-25 16:22 ` Ingo Molnar
2000-09-25 16:17 ` Alexander Viro
2000-09-25 16:36 ` Jeff Garzik
2000-09-25 16:57 ` Alan Cox
2000-09-25 17:01 ` Alexander Viro
2000-09-25 17:06 ` Alan Cox
2000-09-25 17:31 ` Oliver Xymoron
2000-09-25 17:51 ` Jeff Garzik
2000-09-25 19:03 ` the new VMt [4MB+ blocks] Matti Aarnio
2000-09-25 20:02 ` Stephen Williams
2000-09-25 16:33 ` the new VMt Andrea Arcangeli
2000-09-26 8:38 ` Jes Sorensen
2000-09-26 8:52 ` Ingo Molnar
2000-09-26 9:02 ` Jes Sorensen
2000-09-25 16:53 ` Alan Cox
2000-09-25 15:42 ` Stephen C. Tweedie
2000-09-25 16:05 ` Andrea Arcangeli
2000-09-25 16:22 ` Rik van Riel
2000-09-25 16:42 ` Andrea Arcangeli
2000-09-25 17:39 ` Stephen C. Tweedie
2000-09-25 16:51 ` Alan Cox
2000-09-25 17:43 ` Stephen C. Tweedie [this message]
2000-09-25 18:13 ` Alan Cox
2000-09-25 18:21 ` Stephen C. Tweedie
2000-09-25 19:09 ` Alan Cox
2000-09-25 19:21 ` Stephen C. Tweedie
2000-09-25 16:52 ` yodaiken
2000-09-25 17:18 ` Jamie Lokier
2000-09-25 17:51 ` yodaiken
2000-09-25 18:04 ` Jamie Lokier
2000-09-25 18:13 ` yodaiken
2000-09-25 18:24 ` Stephen C. Tweedie
2000-09-25 18:34 ` yodaiken
2000-09-25 18:48 ` Jamie Lokier
2000-09-25 19:25 ` Stephen C. Tweedie
2000-09-25 20:04 ` yodaiken
2000-09-25 20:23 ` Alan Cox
2000-09-25 20:35 ` yodaiken
2000-09-25 20:46 ` Alan Cox
2000-09-25 21:07 ` yodaiken
2000-09-26 9:54 ` Stephen C. Tweedie
2000-09-26 13:17 ` yodaiken
2000-09-25 20:47 ` Benjamin C.R. LaHaise
2000-09-25 21:12 ` yodaiken
2000-09-26 10:07 ` Stephen C. Tweedie
2000-09-26 13:30 ` yodaiken
2000-09-25 20:32 ` Stephen C. Tweedie
2000-09-26 12:10 ` Mark Hemment
2000-09-27 10:13 ` Andrey Savochkin
2000-09-27 12:55 ` Hugh Dickins
2000-09-28 3:25 ` Andrey Savochkin
2000-09-25 23:14 ` Erik Andersen
2000-09-26 15:17 ` yodaiken
2000-09-26 16:04 ` Stephen C. Tweedie
2000-09-26 17:02 ` Erik Andersen
2000-09-26 17:08 ` Stephen C. Tweedie
2000-09-26 17:45 ` Erik Andersen
2000-09-27 10:20 ` Andrey Savochkin
2000-09-26 21:13 ` Eric Lowe
2000-09-25 18:20 ` Andrea Arcangeli
2000-09-25 16:16 ` Rik van Riel
2000-09-25 16:55 ` Alan Cox
2000-09-25 15:48 ` the new VM Andrea Arcangeli
2000-09-25 15:40 ` Stephen C. Tweedie
2000-09-25 16:01 ` Andrea Arcangeli
2000-09-25 14:37 ` Rik van Riel
2000-09-25 20:34 ` Christoph Rohland
2000-10-06 16:14 ` Rik van Riel
2000-10-09 7:37 ` Christoph Rohland
2000-09-25 13:04 ` Ingo Molnar
2000-09-25 13:19 ` Andrea Arcangeli
2000-09-25 13:18 ` Ingo Molnar
2000-09-25 13:21 ` Ingo Molnar
2000-09-25 13:31 ` Andrea Arcangeli
2000-09-25 13:47 ` Ingo Molnar
2000-09-25 14:04 ` Andrea Arcangeli
2000-09-25 1:31 ` [patch] vmfixes-2.4.0-test9-B2 Andrea Arcangeli
2000-09-25 1:27 ` Alexander Viro
2000-09-25 2:02 ` Andrea Arcangeli
2000-09-25 2:01 ` Alexander Viro
2000-09-25 13:47 ` Stephen C. Tweedie
2000-09-25 10:13 ` Ingo Molnar
2000-09-25 12:58 ` Andrea Arcangeli
2000-09-25 13:10 ` Ingo Molnar
2000-09-25 13:49 ` Jens Axboe
2000-09-25 14:11 ` Ingo Molnar
2000-09-25 14:05 ` Jens Axboe
2000-09-25 16:46 ` Linus Torvalds
2000-09-25 17:05 ` Ingo Molnar
2000-09-25 17:23 ` Andrea Arcangeli
2000-09-25 14:20 ` Andrea Arcangeli
2000-09-25 14:11 ` Jens Axboe
2000-09-25 14:33 ` Andrea Arcangeli
2000-09-25 13:56 ` Andrea Arcangeli
2000-09-25 13:57 ` Ingo Molnar
2000-09-25 14:13 ` Andrea Arcangeli
2000-09-25 14:08 ` Jens Axboe
2000-09-25 14:29 ` Andrea Arcangeli
2000-09-25 14:18 ` Jens Axboe
2000-09-25 14:47 ` Andrea Arcangeli
2000-09-25 21:28 ` Jens Axboe
2000-09-25 22:14 ` Andrea Arcangeli
2000-09-25 14:13 ` Ingo Molnar
2000-09-25 14:29 ` Ingo Molnar
2000-09-25 14:46 ` Andrea Arcangeli
2000-09-25 14:53 ` Ingo Molnar
2000-09-25 15:02 ` Andrea Arcangeli
2000-09-24 21:38 ` __GFP_IO && shrink_[d|i]cache_memory()? Stephen C. Tweedie
2000-09-24 23:20 ` Alan Cox
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