From: Tejun Heo <tj@kernel.org>
To: Arjan van de Ven <arjan@linux.intel.com>
Cc: Jens Axboe <jens.axboe@oracle.com>,
Andi Kleen <andi@firstfloor.org>,
Peter Zijlstra <peterz@infradead.org>,
torvalds@linux-foundation.org, awalls@radix.net,
linux-kernel@vger.kernel.org, jeff@garzik.org, mingo@elte.hu,
akpm@linux-foundation.org, rusty@rustcorp.com.au,
cl@linux-foundation.org, dhowells@redhat.com, avi@redhat.com,
johannes@sipsolutions.net
Subject: Re: workqueue thing
Date: Mon, 21 Dec 2009 22:22:20 +0900 [thread overview]
Message-ID: <4B2F768C.1040704@kernel.org> (raw)
In-Reply-To: <4B2F57E6.7020504@linux.intel.com>
Hello,
On 12/21/2009 08:11 PM, Arjan van de Ven wrote:
> I don't mind a good and clean design; and for sure sharing thread
> pools into one pool is really good. But if I have to choose between
> a complex "how to deal with deadlocks" algorithm, versus just
> running some more threads in the pool, I'll pick the later.
The deadlock avoidance algorithm is pretty simple. It creates a new
worker when everything is blocked. If the attempt to create a new
worker blocks, it calls in dedicated workers to ensure allocation path
is not blocked. It's not that complex.
Thanks.
--
tejun
next prev parent reply other threads:[~2009-12-21 13:23 UTC|newest]
Thread overview: 104+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-18 12:57 Tejun Heo
2009-12-18 12:57 ` [PATCH 01/27] sched: rename preempt_notifiers to sched_notifiers and refactor implementation Tejun Heo
2009-12-18 12:57 ` [PATCH 02/27] sched: refactor try_to_wake_up() Tejun Heo
2009-12-18 12:57 ` [PATCH 03/27] sched: implement __set_cpus_allowed() Tejun Heo
2009-12-18 12:57 ` [PATCH 04/27] sched: make sched_notifiers unconditional Tejun Heo
2009-12-18 12:57 ` [PATCH 05/27] sched: add wakeup/sleep sched_notifiers and allow NULL notifier ops Tejun Heo
2009-12-18 12:57 ` [PATCH 06/27] sched: implement try_to_wake_up_local() Tejun Heo
2009-12-18 12:57 ` [PATCH 07/27] acpi: use queue_work_on() instead of binding workqueue worker to cpu0 Tejun Heo
2009-12-18 12:57 ` [PATCH 08/27] stop_machine: reimplement without using workqueue Tejun Heo
2009-12-18 12:57 ` [PATCH 09/27] workqueue: misc/cosmetic updates Tejun Heo
2009-12-18 12:57 ` [PATCH 10/27] workqueue: merge feature parameters into flags Tejun Heo
2009-12-18 12:57 ` [PATCH 11/27] workqueue: define both bit position and mask for work flags Tejun Heo
2009-12-18 12:57 ` [PATCH 12/27] workqueue: separate out process_one_work() Tejun Heo
2009-12-18 12:57 ` [PATCH 13/27] workqueue: temporarily disable workqueue tracing Tejun Heo
2009-12-18 12:57 ` [PATCH 14/27] workqueue: kill cpu_populated_map Tejun Heo
2009-12-18 12:57 ` [PATCH 15/27] workqueue: update cwq alignement Tejun Heo
2009-12-18 12:57 ` [PATCH 16/27] workqueue: reimplement workqueue flushing using color coded works Tejun Heo
2009-12-18 12:57 ` [PATCH 17/27] workqueue: introduce worker Tejun Heo
2009-12-18 12:57 ` [PATCH 18/27] workqueue: reimplement work flushing using linked works Tejun Heo
2009-12-18 12:58 ` [PATCH 19/27] workqueue: implement per-cwq active work limit Tejun Heo
2009-12-18 12:58 ` [PATCH 20/27] workqueue: reimplement workqueue freeze using max_active Tejun Heo
2009-12-18 12:58 ` [PATCH 21/27] workqueue: introduce global cwq and unify cwq locks Tejun Heo
2009-12-18 12:58 ` [PATCH 22/27] workqueue: implement worker states Tejun Heo
2009-12-18 12:58 ` [PATCH 23/27] workqueue: reimplement CPU hotplugging support using trustee Tejun Heo
2009-12-18 12:58 ` [PATCH 24/27] workqueue: make single thread workqueue shared worker pool friendly Tejun Heo
2009-12-18 12:58 ` [PATCH 25/27] workqueue: use shared worklist and pool all workers per cpu Tejun Heo
2009-12-18 12:58 ` [PATCH 26/27] workqueue: implement concurrency managed dynamic worker pool Tejun Heo
2009-12-18 12:58 ` [PATCH 27/27] workqueue: increase max_active of keventd and kill current_is_keventd() Tejun Heo
2009-12-18 13:00 ` SUBJ: [RFC PATCHSET] concurrency managed workqueue, take#2 Tejun Heo
2009-12-18 13:03 ` Tejun Heo
2009-12-18 13:45 ` workqueue thing Peter Zijlstra
2009-12-18 13:50 ` Andi Kleen
2009-12-18 15:01 ` Arjan van de Ven
2009-12-21 3:19 ` Tejun Heo
2009-12-21 9:17 ` Jens Axboe
2009-12-21 10:35 ` Peter Zijlstra
2009-12-21 11:09 ` Andi Kleen
2009-12-21 11:17 ` Arjan van de Ven
2009-12-21 11:33 ` Andi Kleen
2009-12-21 13:18 ` Tejun Heo
2009-12-21 11:11 ` Arjan van de Ven
2009-12-21 13:22 ` Tejun Heo [this message]
2009-12-21 13:53 ` Arjan van de Ven
2009-12-21 14:19 ` Tejun Heo
2009-12-21 15:19 ` Arjan van de Ven
2009-12-22 0:00 ` Tejun Heo
2009-12-22 11:10 ` Peter Zijlstra
2009-12-22 17:20 ` Linus Torvalds
2009-12-22 17:47 ` Peter Zijlstra
2009-12-22 18:07 ` Andi Kleen
2009-12-22 18:20 ` Peter Zijlstra
2009-12-23 8:17 ` Stijn Devriendt
2009-12-23 8:43 ` Peter Zijlstra
2009-12-23 9:01 ` Stijn Devriendt
2009-12-22 18:28 ` Linus Torvalds
2009-12-23 8:06 ` Johannes Berg
2009-12-23 3:37 ` Tejun Heo
2009-12-23 6:52 ` Herbert Xu
2009-12-23 8:00 ` Steffen Klassert
2009-12-23 8:01 ` [PATCH 0/2] Parallel crypto/IPsec v7 Steffen Klassert
2009-12-23 8:03 ` [PATCH 1/2] padata: generic parallelization/serialization interface Steffen Klassert
2009-12-23 8:04 ` [PATCH 2/2] crypto: pcrypt - Add pcrypt crypto parallelization wrapper Steffen Klassert
2010-01-07 5:39 ` [PATCH 0/2] Parallel crypto/IPsec v7 Herbert Xu
2010-01-16 9:44 ` David Miller
2009-12-18 15:30 ` workqueue thing Linus Torvalds
2009-12-18 15:39 ` Ingo Molnar
2009-12-18 15:39 ` Peter Zijlstra
2009-12-18 15:47 ` Linus Torvalds
2009-12-18 15:53 ` Peter Zijlstra
2009-12-21 3:04 ` Tejun Heo
2009-12-21 9:22 ` Peter Zijlstra
2009-12-21 13:30 ` Tejun Heo
2009-12-21 14:26 ` Peter Zijlstra
2009-12-21 23:50 ` Tejun Heo
2009-12-22 11:00 ` Peter Zijlstra
2009-12-22 11:03 ` Peter Zijlstra
2009-12-23 3:43 ` Tejun Heo
2009-12-22 11:04 ` Peter Zijlstra
2009-12-23 3:48 ` Tejun Heo
2009-12-22 11:06 ` Peter Zijlstra
2009-12-23 4:18 ` Tejun Heo
2009-12-23 4:42 ` Linus Torvalds
2009-12-23 6:02 ` Ingo Molnar
2009-12-23 6:13 ` Jeff Garzik
2009-12-23 7:53 ` Ingo Molnar
2009-12-23 8:41 ` Peter Zijlstra
2009-12-23 10:25 ` Jeff Garzik
2009-12-23 13:33 ` Stefan Richter
2009-12-23 14:20 ` Mark Brown
2009-12-23 7:09 ` Tejun Heo
2009-12-23 8:01 ` Ingo Molnar
2009-12-23 8:12 ` Ingo Molnar
2009-12-23 8:32 ` Tejun Heo
2009-12-23 8:42 ` Ingo Molnar
2009-12-23 8:27 ` Tejun Heo
2009-12-23 8:37 ` Ingo Molnar
2009-12-23 8:49 ` Tejun Heo
2009-12-23 8:49 ` Ingo Molnar
2009-12-23 9:03 ` Tejun Heo
2009-12-23 13:40 ` Stefan Richter
2009-12-23 13:43 ` Stefan Richter
2009-12-23 8:25 ` Arjan van de Ven
2009-12-23 13:00 ` Stefan Richter
2009-12-23 8:31 ` Stijn Devriendt
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