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From: Andrew Morton <akpm@linux-foundation.org>
To: Miklos Szeredi <miklos@szeredi.hu>
Cc: dgc@sgi.com, linux-kernel@vger.kernel.org
Subject: Re: [patch 1/3] fix illogical behavior in balance_dirty_pages()
Date: Mon, 26 Mar 2007 02:08:23 -0800	[thread overview]
Message-ID: <20070326020823.8630bb07.akpm@linux-foundation.org> (raw)
In-Reply-To: <E1HVlZH-00018f-00@dorka.pomaz.szeredi.hu>

On Mon, 26 Mar 2007 11:32:47 +0200 Miklos Szeredi <miklos@szeredi.hu> wrote:

> Stopping writers which have idle queues is completely unproductive,
> and that is basically what the current algorithm does.

This is because the kernel permits all of its allotment of dirty+writeback
pages to be dirty+writeback against a single device.

A good way of solving the one-device-starves-another-one problem is to
dynamically adjust the per-device dirty+writeback levels so that (for
example) if two devices are being written to, each gets 50% of the
allotment.

I started working on that but got derailed by the usual blah.  I don't
think either of the proposed fixes took that approach, actually.


  reply	other threads:[~2007-03-26 10:08 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-03-24 21:55 [patch 1/3] fix illogical behavior in balance_dirty_pages() Miklos Szeredi
2007-03-24 21:57 ` [patch 2/3] remove throttle_vm_writeout() Miklos Szeredi
2007-03-25 23:41   ` Andrew Morton
2007-03-26  8:35     ` Miklos Szeredi
2007-03-24 21:58 ` [patch 3/3] balance dirty pages from loop device Miklos Szeredi
2007-03-25 10:03 ` [patch 1/3] fix illogical behavior in balance_dirty_pages() Peter Zijlstra
2007-03-25 11:12   ` Miklos Szeredi
2007-03-25 11:34     ` Miklos Szeredi
2007-03-25 11:50       ` Peter Zijlstra
2007-03-25 20:41         ` Miklos Szeredi
2007-03-25 23:35 ` Andrew Morton
2007-03-26  8:26   ` Miklos Szeredi
2007-03-26  9:01     ` Andrew Morton
2007-03-26  9:20       ` Miklos Szeredi
2007-03-26  9:32         ` Andrew Morton
2007-03-26  9:48           ` Miklos Szeredi
2007-03-26  9:32       ` Miklos Szeredi
2007-03-26 10:08         ` Andrew Morton [this message]
2007-03-26 13:30           ` Peter Zijlstra
2007-03-27  0:30             ` David Chinner
2007-03-27  0:23       ` David Chinner
  -- strict thread matches above, loose matches on Subject: below --
2007-04-03 18:40 Kris Corwin

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