From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: John Stoffel <john@stoffel.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
miklos@szeredi.hu, akpm@linux-foundation.org, neilb@suse.de,
dgc@sgi.com, tomoki.sekiyama.qu@hitachi.com,
nikita@clusterfs.com, trond.myklebust@fys.uio.no,
yingchao.zhou@gmail.com, richard@rsk.demon.co.uk,
torvalds@linux-foundation.org
Subject: Re: [PATCH 00/23] per device dirty throttling -v10
Date: Wed, 12 Sep 2007 11:00:59 +0200 [thread overview]
Message-ID: <1189587659.21778.104.camel@twins> (raw)
In-Reply-To: <18151.20356.862163.430265@stoffel.org>
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On Tue, 2007-09-11 at 22:31 -0400, John Stoffel wrote:
I hope the snipped questions were sufficiently answered in the other
mail. If not, holler :-)
> Peter> 3 is done by also scaling the dirty limit proportional to the
> Peter> current task's recent dirty rate.
>
> Do you mean task or device here? I'm just wondering how well this
> works with a bunch of devices with wildly varying speeds.
Task. What I do is modify the limit like this:
current_limit = dirty_limit * p(bdi_writeout) * (1 - p(task_dirty)/8)
Where the p() values are [0, 1].
By including the inverse of the task dirty rate one gets that tasks that
are more agressive dirtiers get throttled more aggressively, whereas
tasks that occasionally dirty a page get a little more room.
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prev parent reply other threads:[~2007-09-12 9:00 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-11 19:53 Peter Zijlstra
2007-09-11 19:53 ` [PATCH 01/23] nfs: remove congestion_end() Peter Zijlstra
2007-09-11 19:53 ` [PATCH 02/23] lib: percpu_counter_add Peter Zijlstra
2007-09-11 19:53 ` [PATCH 03/23] lib: percpu_counter_sub Peter Zijlstra
2007-09-11 19:53 ` [PATCH 04/23] lib: percpu_counter variable batch Peter Zijlstra
2007-09-11 19:53 ` [PATCH 05/23] lib: make percpu_counter_add take s64 Peter Zijlstra
2007-09-11 19:53 ` [PATCH 06/23] lib: percpu_counter_set Peter Zijlstra
2007-09-11 19:53 ` [PATCH 07/23] lib: percpu_counter_sum_positive Peter Zijlstra
2007-09-11 19:53 ` [PATCH 08/23] lib: percpu_count_sum() Peter Zijlstra
2007-09-11 19:53 ` [PATCH 09/23] lib: percpu_counter_init error handling Peter Zijlstra
2007-09-11 19:54 ` [PATCH 10/23] lib: percpu_counter_init_irq Peter Zijlstra
2007-09-11 19:54 ` [PATCH 11/23] mm: bdi init hooks Peter Zijlstra
2007-09-11 19:54 ` [PATCH 12/23] containers: " Peter Zijlstra
2007-09-11 19:54 ` [PATCH 13/23] mtd: " Peter Zijlstra
2007-09-11 19:54 ` [PATCH 14/23] mtd: clean up the backing_dev_info usage Peter Zijlstra
2007-09-11 19:54 ` [PATCH 15/23] mtd: give mtdconcat devices their own backing_dev_info Peter Zijlstra
2007-09-11 19:54 ` [PATCH 16/23] mm: scalable bdi statistics counters Peter Zijlstra
2007-09-11 19:54 ` [PATCH 17/23] mm: count reclaimable pages per BDI Peter Zijlstra
2007-09-11 19:54 ` [PATCH 18/23] mm: count writeback " Peter Zijlstra
2007-09-11 19:54 ` [PATCH 19/23] mm: expose BDI statistics in sysfs Peter Zijlstra
2007-09-11 19:54 ` [PATCH 20/23] lib: floating proportions Peter Zijlstra
2007-09-11 19:54 ` [PATCH 21/23] mm: per device dirty threshold Peter Zijlstra
2007-09-12 2:36 ` John Stoffel
2007-09-12 8:45 ` Peter Zijlstra
2007-09-11 19:54 ` [PATCH 22/23] mm: dirty balancing for tasks Peter Zijlstra
2007-09-11 19:54 ` [PATCH 23/23] debug: sysfs files for the current ratio/size/total Peter Zijlstra
2007-09-12 2:31 ` [PATCH 00/23] per device dirty throttling -v10 John Stoffel
2007-09-12 9:00 ` Peter Zijlstra [this message]
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