linux-kernel - Re: [patch 1/3] fix illogical behavior in balance_dirty

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Message-Id: <20070326020823.8630bb07.akpm@linux-foundation.org>
Date:	Mon, 26 Mar 2007 02:08:23 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	dgc@....com, linux-kernel@...r.kernel.org
Subject: Re: [patch 1/3] fix illogical behavior in balance_dirty_pages()

On Mon, 26 Mar 2007 11:32:47 +0200 Miklos Szeredi <miklos@...redi.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.

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