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From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Andrew Morton <akpm@osdl.org>
Cc: riel@redhat.com, marcelo.tosatti@cyclades.com, andrea@suse.de,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH][5/?] count writeback pages in nr_scanned
Date: Thu, 06 Jan 2005 12:40:47 +1100	[thread overview]
Message-ID: <41DC971F.9030705@yahoo.com.au> (raw)
In-Reply-To: <20050105173739.2d91deb3.akpm@osdl.org>

Andrew Morton wrote:
> Nick Piggin <nickpiggin@yahoo.com.au> wrote:
> 
>>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.
> 
> 
> Why?  Is the nr_scanned fix insufficient?
> 

I thought it sounded like he implied that nr_scanned was insufficient
(otherwise he might have said "to wait on ... but my patch fixes it").



  reply	other threads:[~2005-01-06  1:41 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
2005-01-06  1:37                   ` Andrew Morton
2005-01-06  1:40                     ` Nick Piggin [this message]
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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