From: corbet@lwn.net (Jonathan Corbet)
To: Ingo Molnar <mingo@elte.hu>
Cc: 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,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [RFC PATCH 0/6] Convert all tasklets to workqueues
Date: Sun, 24 Jun 2007 09:16:07 -0600 [thread overview]
Message-ID: <10876.1182698167@lwn.net> (raw)
In-Reply-To: Your message of "Fri, 22 Jun 2007 23:59:53 +0200." <20070622215953.GA22917@elte.hu>
Ingo Molnar <mingo@elte.hu> wrote:
> so how about the following, different approach: anyone who has a tasklet
> in any performance-sensitive codepath, please yell now.
The cafe_ccic (OLPC) camera driver uses a tasklet to move frames out of
the DMA buffers in the streaming I/O path. With this change in place,
I'd worry that the possibility of dropping frames would increase,
especially considering that (1) this is running on OLPC hardware, and
(2) there is typically a streaming video application running in user
space.
Obviously some testing is called for here. I will make an attempt to do
that testing, but the next few weeks involve some insane travel which
will make that hard. Stay tuned.
Thanks,
jon
Jonathan Corbet / LWN.net / corbet@lwn.net
next prev parent reply other threads:[~2007-06-24 15:43 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 [this message]
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
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
-- strict thread matches above, loose matches on Subject: below --
2007-06-26 13:03 Clemens Ladisch
2007-06-26 13:15 ` Takashi Iwai
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