From: Andi Kleen <andi@firstfloor.org>
To: Tejun Heo <tj@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>,
jeff@garzik.org, mingo@elte.hu, linux-kernel@vger.kernel.org,
akpm@linux-foundation.org, jens.axboe@oracle.com,
rusty@rustcorp.com.au, cl@linux-foundation.org,
dhowells@redhat.com, ar@firstfloor.org
Subject: Re: [PATCH 19/19] workqueue: implement concurrency managed workqueue
Date: Sat, 3 Oct 2009 04:59:22 +0200 [thread overview]
Message-ID: <20091003025922.GP1656@one.firstfloor.org> (raw)
In-Reply-To: <4AC5ED72.7090201@kernel.org>
> One thing is that for userspace there's already pretty thick layer of
> abstraction in place and having this type of bare metal mechanism
> might not buy much. In most cases, monitoring system parameters
That can be costly in terms of power/cpu cycles.
> periodically and supplying a bit of extra threads should be able to
> achieve about the same result. Do you have anything specific on your
> mind?
I was thinking of a special file descriptor that could be polled on.
Register threads to be monitored and get a notification back this
way when they are busy above some threshold. Then a runtime could
start more threads upto the maximum number of cores. This would
be mainly useful with existing work distributing libraries
like threadbuildingblocks.
-Andi
--
ak@linux.intel.com -- Speaking for myself only.
next prev parent reply other threads:[~2009-10-03 2:59 UTC|newest]
Thread overview: 83+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-01 8:08 [RFC PATCHSET] workqueue: implement concurrency managed workqueue Tejun Heo
2009-10-01 8:09 ` [PATCH 01/19] freezer: don't get over-anxious while waiting Tejun Heo
2009-10-01 18:36 ` Pavel Machek
2009-10-01 21:04 ` Rafael J. Wysocki
2009-10-02 10:56 ` Tejun Heo
2009-10-02 19:47 ` Oren Laadan
2009-10-02 21:04 ` Matt Helsley
2009-10-02 21:21 ` Rafael J. Wysocki
2009-10-03 0:43 ` Tejun Heo
2009-10-03 19:36 ` Rafael J. Wysocki
2009-10-01 8:09 ` [PATCH 02/19] scheduler: implement sched_class_equal() Tejun Heo
2009-10-01 8:09 ` [PATCH 03/19] scheduler: implement workqueue scheduler class Tejun Heo
2009-10-01 16:57 ` Linus Torvalds
2009-10-01 18:48 ` Ingo Molnar
2009-10-01 19:00 ` Avi Kivity
2009-10-01 19:11 ` Linus Torvalds
2009-10-01 19:23 ` Ingo Molnar
2009-10-01 20:03 ` Linus Torvalds
2009-10-01 19:15 ` Ingo Molnar
2009-10-01 19:06 ` Linus Torvalds
2009-10-02 12:23 ` Tejun Heo
2009-10-01 8:09 ` [PATCH 04/19] scheduler: implement force_cpus_allowed_ptr() Tejun Heo
2009-10-01 8:09 ` [PATCH 05/19] kthread: implement kthread_data() Tejun Heo
2009-10-01 8:09 ` [PATCH 06/19] acpi: use queue_work_on() instead of binding workqueue worker to cpu0 Tejun Heo
2009-10-01 12:57 ` David Howells
2009-10-01 17:07 ` Tejun Heo
2009-10-01 8:09 ` [PATCH 07/19] stop_machine: reimplement without using workqueue Tejun Heo
2009-10-06 9:36 ` Rusty Russell
2009-10-06 23:42 ` Tejun Heo
2009-10-01 8:09 ` [PATCH 08/19] workqueue: misc/cosmetic updates Tejun Heo
2009-10-01 8:09 ` [PATCH 09/19] workqueue: merge feature parametesr into flags Tejun Heo
2009-10-01 8:09 ` [PATCH 10/19] workqueue: update cwq alignement and make one more flag bit available Tejun Heo
2009-10-01 13:05 ` David Howells
2009-10-01 16:15 ` Jeff Garzik
2009-10-01 16:20 ` David Howells
2009-10-01 16:30 ` Tejun Heo
2009-10-01 16:39 ` Alan Cox
2009-10-01 18:45 ` Ben Pfaff
2009-10-02 11:56 ` Tejun Heo
2009-10-01 8:09 ` [PATCH 11/19] workqueue: define both bit position and mask for work flags Tejun Heo
2009-10-01 8:09 ` [PATCH 12/19] workqueue: separate out process_one_work() Tejun Heo
2009-10-01 8:09 ` [PATCH 13/19] workqueue: temporarily disable workqueue tracing Tejun Heo
2009-10-01 8:09 ` [PATCH 14/19] workqueue: (TEMPORARY) kill singlethread variant Tejun Heo
2009-10-01 8:09 ` [PATCH 15/19] workqueue: reimplement workqueue flushing using color coded works Tejun Heo
2009-10-01 17:03 ` Linus Torvalds
2009-10-01 17:11 ` Tejun Heo
2009-10-01 17:16 ` Tejun Heo
2009-10-01 8:09 ` [PATCH 16/19] workqueue: introduce worker Tejun Heo
2009-10-01 8:09 ` [PATCH 17/19] workqueue: reimplement work flushing using linked works Tejun Heo
2009-10-01 8:09 ` [PATCH 18/19] workqueue: reimplement workqueue freeze using cwq->frozen_works queue Tejun Heo
2009-10-01 8:09 ` [PATCH 19/19] workqueue: implement concurrency managed workqueue Tejun Heo
2009-10-01 13:15 ` David Howells
2009-10-02 12:03 ` Tejun Heo
2009-10-01 14:49 ` Andrew Morton
2009-10-01 15:12 ` Ingo Molnar
2009-10-01 16:34 ` Tejun Heo
2009-10-04 8:49 ` Peter Zijlstra
2009-10-01 17:12 ` Linus Torvalds
2009-10-01 17:22 ` Tejun Heo
2009-10-01 17:55 ` Linus Torvalds
2009-10-02 0:42 ` Andi Kleen
2009-10-02 12:09 ` Tejun Heo
2009-10-03 2:59 ` Andi Kleen [this message]
2009-10-02 14:28 ` Frédéric Weisbecker
2009-10-01 8:24 ` [RFC PATCHSET] " Jens Axboe
2009-10-01 16:36 ` Tejun Heo
2009-10-01 8:24 ` Jens Axboe
2009-10-01 16:25 ` Tejun Heo
2009-10-01 8:40 ` Ingo Molnar
2009-10-01 8:47 ` Jens Axboe
2009-10-01 9:01 ` Ingo Molnar
2009-10-01 9:05 ` Jens Axboe
2009-10-01 9:11 ` Avi Kivity
2009-10-01 9:22 ` Avi Kivity
2009-10-01 16:55 ` Tejun Heo
2009-10-01 17:06 ` Avi Kivity
2009-10-01 16:43 ` Tejun Heo
2009-10-01 12:53 ` David Howells
2009-10-02 11:44 ` Tejun Heo
2009-10-02 12:45 ` Stefan Richter
2009-10-02 15:38 ` David Howells
2009-10-03 5:07 ` Tejun Heo
2009-10-04 8:41 ` Peter Zijlstra
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