From: Daniel Walker <dwalker@mvista.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Steven Rostedt <rostedt@goodmis.org>,
LKML <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Christoph Hellwig <hch@infradead.org>,
john stultz <johnstul@us.ibm.com>,
Oleg Nesterov <oleg@tv-sign.ru>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Dipankar Sarma <dipankar@in.ibm.com>,
"David S. Miller" <davem@davemloft.net>,
matthew.wilcox@hp.com, kuznet@ms2.inr.ac.ru
Subject: Re: [RFC PATCH 0/6] Convert all tasklets to workqueues
Date: Fri, 22 Jun 2007 14:53:21 -0700 [thread overview]
Message-ID: <1182549202.3228.78.camel@dhcp193.mvista.com> (raw)
In-Reply-To: <20070622204058.GA11777@elte.hu>
On Fri, 2007-06-22 at 22:40 +0200, Ingo Molnar wrote:
>
> - tasklets have certain fairness limitations. (they are executed in
> softirq context and thus preempt everything, even if there is some
> potentially more important, high-priority task waiting to be
> executed.)
Since -rt has been executing tasklets in process context for a long
time, I'm not sure this change would cause to many regressions. However,
it seems like implicit dependencies on "tasklets preempt everything"
might crop up. The other issue is if they don't "preempt
everything" (most of the time), what default priority do we give them
(all of the time)? It seems like Christoph's suggestion of converting
all the tasklets individually might be a better option, to deal with
specific pitfalls.
Daniel
next prev parent reply other threads:[~2007-06-22 21:57 UTC|newest]
Thread overview: 129+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-22 4:00 [RFC PATCH 0/6] Convert all tasklets to workqueues Steven Rostedt
2007-06-22 4:00 ` [RFC PATCH 1/6] Convert the RCU tasklet into a softirq Steven Rostedt
2007-06-22 7:10 ` Christoph Hellwig
2007-06-22 7:43 ` Ingo Molnar
2007-06-22 12:35 ` Steven Rostedt
2007-06-22 12:55 ` Ingo Molnar
2007-06-22 4:00 ` [RFC PATCH 2/6] Split out tasklets from softirq.c Steven Rostedt
2007-06-22 7:11 ` Christoph Hellwig
2007-06-22 12:40 ` Steven Rostedt
2007-06-22 13:45 ` Akinobu Mita
2007-06-22 13:58 ` Steven Rostedt
2007-06-22 4:00 ` [RFC PATCH 3/6] Add a tasklet is-scheduled API Steven Rostedt
2007-06-22 4:00 ` [RFC PATCH 4/6] Make DRM use the tasklet is-sched API Steven Rostedt
2007-06-22 6:36 ` Daniel Walker
2007-06-22 6:49 ` Thomas Gleixner
2007-06-22 7:08 ` Daniel Walker
2007-06-22 12:15 ` Steven Rostedt
2007-06-22 15:36 ` Daniel Walker
2007-06-22 22:38 ` Ingo Molnar
2007-06-22 23:28 ` Daniel Walker
2007-06-22 16:10 ` Arnd Bergmann
2007-06-22 16:56 ` Steven Rostedt
2007-06-22 18:24 ` Christoph Hellwig
2007-06-22 23:38 ` Dave Airlie
2007-06-22 4:00 ` [RFC PATCH 5/6] Move tasklet.h to tasklet_softirq.h Steven Rostedt
2007-06-22 4:00 ` [RFC PATCH 6/6] Convert tasklets to work queues Steven Rostedt
2007-06-22 7:06 ` Daniel Walker
2007-06-22 13:29 ` Steven Rostedt
2007-06-22 15:52 ` Oleg Nesterov
2007-06-22 16:35 ` Steven Rostedt
2007-06-23 11:15 ` Arnd Bergmann
2007-06-22 7:09 ` [RFC PATCH 0/6] Convert all tasklets to workqueues Christoph Hellwig
2007-06-22 7:51 ` Ingo Molnar
2007-06-22 7:53 ` Christoph Hellwig
2007-06-22 11:23 ` Ingo Molnar
2007-06-22 12:32 ` Steven Rostedt
2007-06-22 12:38 ` Ingo Molnar
2007-06-22 12:58 ` Steven Rostedt
2007-06-22 13:12 ` Ingo Molnar
2007-06-22 14:27 ` Steven Rostedt
2007-06-22 13:13 ` Andrew Morton
2007-06-22 13:26 ` Ingo Molnar
2007-06-22 13:41 ` Andrew Morton
2007-06-22 14:00 ` Ingo Molnar
2007-06-22 13:35 ` Steven Rostedt
2007-06-22 14:25 ` Arjan van de Ven
2007-06-22 14:42 ` Steven Rostedt
2007-06-22 14:43 ` Arjan van de Ven
2007-06-22 17:16 ` Linus Torvalds
2007-06-22 17:31 ` Steven Rostedt
2007-06-22 18:32 ` Christoph Hellwig
2007-06-22 20:40 ` Ingo Molnar
2007-06-22 21:00 ` Christoph Hellwig
2007-06-22 21:10 ` Ingo Molnar
2007-06-22 21:13 ` Thomas Gleixner
2007-06-22 21:37 ` Linus Torvalds
2007-06-22 21:59 ` Ingo Molnar
2007-06-22 22:09 ` Ingo Molnar
2007-06-22 22:43 ` Roland Dreier
2007-06-22 22:57 ` Alan Cox
2007-06-22 22:58 ` Steven Rostedt
2007-06-23 6:23 ` Dave Airlie
2007-06-24 15:16 ` Jonathan Corbet
2007-06-24 15:52 ` Steven Rostedt
2007-06-25 16:50 ` Tilman Schmidt
2007-06-25 17:06 ` Steven Rostedt
2007-06-25 20:50 ` Tilman Schmidt
2007-06-25 21:03 ` Steven Rostedt
2007-06-25 19:52 ` Stephen Hemminger
2007-06-26 0:00 ` Jonathan Corbet
2007-06-26 0:52 ` Steven Rostedt
2007-06-25 18:48 ` Kristian Høgsberg
2007-06-25 19:11 ` Steven Rostedt
2007-06-25 20:07 ` Kristian Høgsberg
2007-06-25 20:31 ` Steven Rostedt
2007-06-25 21:08 ` Kristian Høgsberg
2007-06-25 21:15 ` Ingo Molnar
2007-06-25 23:36 ` Stefan Richter
2007-06-26 0:46 ` Steven Rostedt
2007-06-26 1:46 ` Dan Williams
2007-06-26 2:01 ` Steven Rostedt
2007-06-26 2:12 ` Dan Williams
2007-06-28 12:37 ` Steven Rostedt
2007-06-28 16:37 ` Oleg Nesterov
2007-06-28 18:02 ` Dan Williams
2007-06-28 20:46 ` Steven Rostedt
2007-06-28 21:23 ` Dan Williams
2007-06-28 21:40 ` Dan Williams
2007-06-28 22:01 ` Steven Rostedt
2007-06-28 22:00 ` Steven Rostedt
2007-06-28 5:48 ` Jeff Garzik
2007-06-28 9:23 ` Ingo Molnar
2007-06-28 14:38 ` Alexey Kuznetsov
2007-06-28 15:23 ` Jeff Garzik
2007-06-28 15:54 ` Steven Rostedt
2007-06-28 16:00 ` Ingo Molnar
2007-06-28 17:26 ` Jeff Garzik
2007-06-28 17:44 ` Jeff Garzik
2007-06-28 18:19 ` Andrew Morton
2007-06-28 20:07 ` Ingo Molnar
2007-06-29 11:34 ` Alexey Kuznetsov
2007-06-29 11:48 ` Duncan Sands
2007-06-29 13:36 ` Alexey Kuznetsov
2007-06-29 14:01 ` Duncan Sands
2007-06-29 16:34 ` Alexey Kuznetsov
2007-06-29 12:29 ` Ingo Molnar
2007-06-29 13:25 ` Alexey Kuznetsov
2007-06-29 13:43 ` Ingo Molnar
2007-06-29 15:23 ` Alexey Kuznetsov
2007-06-29 13:41 ` Steven Rostedt
2007-06-29 14:24 ` Jeff Garzik
2007-06-29 14:26 ` Oleg Nesterov
2007-06-29 19:04 ` Alexey Kuznetsov
2007-06-29 14:27 ` Alexey Kuznetsov
2007-06-29 15:51 ` Oleg Nesterov
2007-06-29 16:21 ` Alexey Kuznetsov
2007-06-29 16:52 ` Oleg Nesterov
2007-06-29 17:09 ` Oleg Nesterov
2007-06-30 11:25 ` Oleg Nesterov
2007-06-28 15:17 ` Jeff Garzik
2007-06-22 21:53 ` Daniel Walker [this message]
2007-06-22 22:09 ` david
2007-06-22 22:15 ` Daniel Walker
2007-06-22 22:44 ` Ingo Molnar
2007-06-22 23:28 ` Daniel Walker
2007-06-22 22:15 ` Ingo Molnar
2007-06-23 5:14 ` Stephen Hemminger
2007-06-26 13:03 Clemens Ladisch
2007-06-26 13:15 ` Takashi Iwai
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