From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Rik van Riel <riel@redhat.com>
Cc: Marcelo Tosatti <marcelo.tosatti@cyclades.com>,
Andrew Morton <akpm@osdl.org>,
andrea@suse.de, linux-kernel@vger.kernel.org
Subject: Re: [PATCH][5/?] count writeback pages in nr_scanned
Date: Thu, 06 Jan 2005 12:33:17 +1100 [thread overview]
Message-ID: <41DC955D.9020505@yahoo.com.au> (raw)
In-Reply-To: <Pine.LNX.4.61.0501052025450.11550@chimarrao.boston.redhat.com>
Rik van Riel wrote:
> On Thu, 6 Jan 2005, Nick Piggin wrote:
>
>> I think what Andrea is worried about is that blk_congestion_wait is
>> fairly vague, and can be a source of instability in the scanning
>> implementation.
>
>
> The recent OOM kill problem has been happening:
> 1) with cache pressure on lowmem only, due to a block device write
> 2) with no block congestion at all
> 3) with pretty much all pageable lowmme pages in writeback state
>
> It appears the VM has trouble dealing with the situation where
> there is no block congestion to wait on...
>
Try, together with your nr_scanned patch, to replace blk_congestion_wait
with io_schedule_timeout.
next prev parent reply other threads:[~2005-01-06 1:33 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
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 [this message]
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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