From: Andrew Morton <akpm@osdl.org>
To: Rik van Riel <riel@redhat.com>
Cc: linux-kernel@vger.kernel.org, andrea@suse.de,
marcelo.tosatti@cyclades.com
Subject: Re: [PATCH][5/?] count writeback pages in nr_scanned
Date: Wed, 5 Jan 2005 02:08:59 -0800 [thread overview]
Message-ID: <20050105020859.3192a298.akpm@osdl.org> (raw)
In-Reply-To: <Pine.LNX.4.61.0501031224400.25392@chimarrao.boston.redhat.com>
Rik van Riel <riel@redhat.com> wrote:
>
> Still untested, but posting the concept here anyway, since this
> could explain a lot...
>
> OOM kills have been observed with 70% of the pages in lowmem being
> in the writeback state. If we count those pages in sc->nr_scanned,
> the VM should throttle and wait for IO completion, instead of OOM
> killing.
>
> Signed-off-by: Rik van Riel <riel@redhat.com>
>
> --- linux-2.6.9/mm/vmscan.c.screclaim 2005-01-03 12:17:56.547148905 -0500
> +++ linux-2.6.9/mm/vmscan.c 2005-01-03 12:18:16.855965416 -0500
> @@ -376,10 +376,10 @@
>
> BUG_ON(PageActive(page));
>
> + sc->nr_scanned++;
> if (PageWriteback(page))
> goto keep_locked;
>
> - sc->nr_scanned++;
Patch looks very sane. It in fact restores that which we were doing until
12 June 2004, when the rampant `struct scan_control' depredations violated
the tree.
next prev parent reply other threads:[~2005-01-05 10:09 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-03 17:25 [PATCH][5/?] count writeback pages in nr_scanned Rik van Riel
2005-01-05 10:08 ` Andrew Morton [this message]
2005-01-05 18:06 ` Andrea Arcangeli
2005-01-05 18:50 ` Rik van Riel
2005-01-05 17:49 ` Marcelo Tosatti
2005-01-05 21:44 ` Andrew Morton
2005-01-05 20:32 ` Marcelo Tosatti
2005-01-05 23:51 ` Nick Piggin
2005-01-06 1:27 ` Rik van Riel
2005-01-06 1:33 ` Nick Piggin
2005-01-06 1:37 ` Andrew Morton
2005-01-06 1:40 ` Nick Piggin
2005-01-06 1:52 ` Andrea Arcangeli
2005-01-06 1:36 ` Andrew Morton
2005-01-06 3:42 ` Rik van Riel
2005-01-06 3:50 ` Nick Piggin
2005-01-06 4:26 ` Andrew Morton
2005-01-06 4:35 ` Nick Piggin
2005-01-06 4:47 ` Andrew Morton
2005-01-06 4:55 ` Nick Piggin
2005-01-06 5:03 ` Andrea Arcangeli
2005-01-06 8:06 ` Jens Axboe
2005-01-06 8:16 ` memory barrier in ll_rw_blk.c (was Re: [PATCH][5/?] count writeback pages in nr_scanned) Nick Piggin
2005-01-06 8:32 ` Jens Axboe
2005-01-06 8:53 ` Nick Piggin
2005-01-06 12:00 ` Jens Axboe
2005-01-06 4:59 ` [PATCH][5/?] count writeback pages in nr_scanned Andrea Arcangeli
2005-01-06 5:05 ` Andrew Morton
2005-01-06 5:17 ` Andrea Arcangeli
2005-01-06 5:19 ` Nick Piggin
2005-01-06 5:25 ` Andrea Arcangeli
2005-01-06 5:36 ` Nick Piggin
2005-01-06 5:44 ` Nick Piggin
2005-01-06 5:37 ` Andrew Morton
2005-01-06 5:59 ` Andrea Arcangeli
2005-01-06 13:28 ` Rik van Riel
2005-01-06 5:32 ` Andrew Morton
2005-01-06 5:46 ` Andrea Arcangeli
2005-01-06 5:59 ` Andrew Morton
2005-01-06 6:16 ` Andrea Arcangeli
2005-01-06 5:06 ` Nick Piggin
2005-01-06 5:21 ` Andrea Arcangeli
2005-01-05 23:26 ` Andrew Morton
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