From: Ingo Molnar <mingo@elte.hu>
To: Kai Germaschewski <kai-germaschewski@uiowa.edu>
Cc: Linus Torvalds <torvalds@transmeta.com>, <linux-kernel@vger.kernel.org>
Subject: Re: [patch] Workqueue Abstraction, 2.5.40-H7
Date: Tue, 1 Oct 2002 23:27:16 +0200 (CEST) [thread overview]
Message-ID: <Pine.LNX.4.44.0210012323200.25070-100000@localhost.localdomain> (raw)
In-Reply-To: <Pine.LNX.4.44.0210011251050.10307-100000@chaos.physics.uiowa.edu>
On Tue, 1 Oct 2002, Kai Germaschewski wrote:
> I'm possibly messing things up here, but doesn't it generally make more
> sense to convert tq_immediate users to tasklets instead of work queues?
>
> tq_immediate users do not need process context, and one use I'm familiar
> with is basically doing bottom half interrupt processing, e.g. in lots
> of places in the ISDN code. Introducing a context switch for no obvious
> gain there seems rather pointless to me?
>
> The same may be true for the tq_timer users as well?
the main reason was that it was easier to convert everything (even old-BH
style code) that did deferred processing to workqueues than to tasklets -
since a fair chunk of deferred processing needs process context. Another
reason is that generally it's easier to handle overload situations if the
work is done in process contexts. But i agree, for things where it really
matters performance-wise, introducing a tasklet should be the next step.
Ingo
next prev parent reply other threads:[~2002-10-01 21:11 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-01 16:24 [patch] Workqueue Abstraction, 2.5.40-H7 Ingo Molnar
2002-10-01 17:55 ` Kai Germaschewski
2002-10-01 21:27 ` Ingo Molnar [this message]
2002-10-01 18:04 ` Jeff Garzik
2002-10-01 18:52 ` Ingo Molnar
2002-10-01 21:06 ` Jeff Garzik
2002-10-01 21:30 ` Ingo Molnar
2002-10-01 19:16 ` Linus Torvalds
2002-10-01 19:53 ` Linus Torvalds
2002-10-01 21:32 ` Kristian Hogsberg
2002-10-03 18:44 ` Ingo Molnar
2002-10-04 23:20 ` Kristian Hogsberg
2002-10-02 4:22 ` Christoph Hellwig
2002-10-01 21:31 ` Ingo Molnar
2002-10-02 8:22 ` Oleg Drokin
2002-10-08 3:50 ` Jeff Dike
2002-10-01 18:52 Marc-Christian Petersen
2002-10-02 3:58 ` Christoph Hellwig
2002-10-01 20:29 Ingo Molnar
2002-10-01 20:49 ` Linus Torvalds
2002-10-01 21:21 ` Ingo Molnar
2002-10-02 3:23 ` Miles Bader
2002-10-02 19:18 ` Randy.Dunlap
2002-10-01 21:09 ` Jes Sorensen
2002-10-01 21:35 ` Ingo Molnar
2002-10-03 1:38 ` Kevin O'Connor
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