From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>,
ksummit-2008-discuss@lists.linux-foundation.org,
Linux Kernel list <linux-kernel@vger.kernel.org>,
Jeremy Kerr <jk@ozlabs.org>
Subject: Re: [Ksummit-2008-discuss] Delayed interrupt work, thread pools
Date: Thu, 03 Jul 2008 20:31:26 +1000 [thread overview]
Message-ID: <1215081086.19689.6.camel@pasglop> (raw)
In-Reply-To: <m1zlozmg2k.fsf@frodo.ebiederm.org>
On Thu, 2008-07-03 at 03:12 -0700, Eric W. Biederman wrote:
> Benjamin Herrenschmidt <benh@kernel.crashing.org> writes:
>
> > The question is: is that significantly less overhead than just spawning
> > a new full blown kernel thread ? enough to justify the complexity ? at
> > the end of the day, it means allocating a stack (which on ppc64 is still
> > 16K, I know it sucks)...
>
> I looked at this a while ago. And right now kernel_thread is fairly light.
> kthread_create has latency issues because we need to queue up a task on
> our kernel thread spawning daemon, and let it fork the child. Needing
> to go via the kthread spawning daemon didn't look fundamental, just something
> that was a challenge to sort out.
Yes. I was thinking that if it becomes an issue, we could special case
something in the scheduler to pop them.
Ben.
next prev parent reply other threads:[~2008-07-03 11:55 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-01 12:45 Delayed interrupt work, thread pools Benjamin Herrenschmidt
2008-07-01 12:53 ` [Ksummit-2008-discuss] " Matthew Wilcox
2008-07-01 13:38 ` Benjamin Herrenschmidt
2008-07-01 13:02 ` Robin Holt
2008-07-02 1:39 ` Dean Nelson
2008-07-02 2:38 ` Benjamin Herrenschmidt
2008-07-02 2:47 ` Dave Chinner
2008-07-02 14:27 ` [Ksummit-2008-discuss] " Hugh Dickins
2008-07-02 4:22 ` Arjan van de Ven
2008-07-02 5:44 ` Benjamin Herrenschmidt
2008-07-02 11:02 ` Andi Kleen
2008-07-02 11:19 ` Leon Woestenberg
2008-07-02 11:24 ` Andi Kleen
2008-07-02 20:57 ` Benjamin Herrenschmidt
2008-07-02 14:11 ` James Bottomley
2008-07-02 20:00 ` Steven Rostedt
2008-07-02 20:22 ` James Bottomley
2008-07-02 20:28 ` Arjan van de Ven
2008-07-02 20:40 ` Steven Rostedt
2008-07-02 21:02 ` Benjamin Herrenschmidt
2008-07-02 21:00 ` Benjamin Herrenschmidt
2008-07-03 10:12 ` Eric W. Biederman
2008-07-03 10:31 ` Benjamin Herrenschmidt [this message]
2008-07-07 14:09 ` Chris Mason
2008-07-07 23:03 ` Benjamin Herrenschmidt
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