From: Lee Revell <rlrevell@joe-job.com>
To: dipankar@in.ibm.com
Cc: George Anzinger <george@mvista.com>,
ganzinger@mvista.com, Manfred Spraul <manfred@colorfullife.com>,
lkml <linux-kernel@vger.kernel.org>
Subject: Re: RCU question
Date: Fri, 10 Dec 2004 15:45:31 -0500 [thread overview]
Message-ID: <1102711532.29919.35.camel@krustophenia.net> (raw)
In-Reply-To: <20041210204003.GC4073@in.ibm.com>
On Sat, 2004-12-11 at 02:10 +0530, Dipankar Sarma wrote:
> On Fri, Dec 10, 2004 at 11:42:55AM -0800, George Anzinger wrote:
> > Dipankar Sarma wrote:
> > >And yes, RCU processing in softirq context can re-raise the softirq.
> > >AFAICS, it is perfectly normal.
> >
> > My assumption was that, this being the idle task, RCU would be more than
> > happy to finish all its pending tasks.
>
> We try to avoid really long running softirqs (RCU tasklet in this case)
> for better scheduling latency. A long running rcu tasklet during
> an idle cpu may delay running of an RT process that becomes runnable
> during the rcu tasklet.
>
Well, softirqs should really be preemptible if you care about RT task
latency. Ingo's patches have had this for months. Works great. Maybe
it's time to push it upstream.
Lee
next prev parent reply other threads:[~2004-12-10 20:45 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-09 23:59 RCU question George Anzinger
2004-12-10 4:31 ` Dipankar Sarma
2004-12-10 19:42 ` George Anzinger
2004-12-10 20:40 ` Dipankar Sarma
2004-12-10 20:45 ` Lee Revell [this message]
2004-12-10 21:02 ` George Anzinger
2004-12-10 22:58 ` Zwane Mwaikambo
2004-12-11 2:22 ` George Anzinger
2004-12-11 2:45 ` Zwane Mwaikambo
2004-12-11 3:29 ` George Anzinger
2004-12-11 14:52 ` Zwane Mwaikambo
2004-12-11 16:32 ` Manfred Spraul
2004-12-11 16:52 ` George Anzinger
2004-12-12 2:53 ` Zwane Mwaikambo
2004-12-12 8:59 ` Manfred Spraul
2004-12-12 9:37 ` Andrea Arcangeli
2004-12-12 10:22 ` Manfred Spraul
2004-12-12 12:15 ` Andrea Arcangeli
2004-12-14 21:40 ` Lee Revell
2004-12-14 22:23 ` [patch, 2.6.10-rc3] safe_hlt() & NMIs Ingo Molnar
2004-12-14 22:47 ` Ingo Molnar
2004-12-14 23:09 ` Linus Torvalds
2004-12-15 8:52 ` Ingo Molnar
2004-12-15 15:44 ` Linus Torvalds
2004-12-15 16:35 ` Ingo Molnar
2004-12-16 0:37 ` Alan Cox
2004-12-16 1:58 ` Linus Torvalds
2004-12-16 14:51 ` Ingo Molnar
2004-12-16 15:08 ` Maciej W. Rozycki
2004-12-16 15:11 ` Ingo Molnar
2004-12-16 15:42 ` Maciej W. Rozycki
2004-12-16 15:54 ` Linus Torvalds
2004-12-16 2:10 ` Zwane Mwaikambo
2004-12-16 13:26 ` Alan Cox
2004-12-14 23:41 ` Andrea Arcangeli
2004-12-14 23:00 ` Linus Torvalds
2004-12-15 5:04 ` Andi Kleen
2004-12-15 6:27 ` Avi Kivity
2004-12-15 8:51 ` Ingo Molnar
2004-12-12 16:51 ` RCU question George Anzinger
2004-12-12 22:40 ` Manfred Spraul
2004-12-13 5:22 ` George Anzinger
2004-12-12 16:26 ` Zwane Mwaikambo
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