From: Peter Zijlstra <peterz@infradead.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
linux-rt-users <linux-rt-users@vger.kernel.org>,
Ingo Molnar <mingo@elte.hu>, Carsten Emde <ce@ceag.ch>,
Clark Williams <williams@redhat.com>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Kumar Gala <galak@gate.crashing.org>,
Ralf Baechle <ralf@linux-mips.org>, rostedt <rostedt@goodmis.org>
Subject: Re: On migrate_disable() and latencies
Date: Fri, 22 Jul 2011 16:57:43 +0200 [thread overview]
Message-ID: <1311346663.9642.0.camel@twins> (raw)
In-Reply-To: <1311331798.27400.28.camel@twins>
On Fri, 2011-07-22 at 12:49 +0200, Peter Zijlstra wrote:
> > The scenario is on where you stack N migrate-disable tasks on a run
> > queue (necessarily of increasing priority). Doing this requires all cpus
> > in the system to be as busy, for otherwise the task would simply be
> > moved to another cpu.
>
> This implies it requires at least nr-cpus^2 tasks to pull this off.
OK, scrap that, 2*nr-cpus is enough.
next prev parent reply other threads:[~2011-07-22 14:58 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-22 10:19 On migrate_disable() and latencies Peter Zijlstra
2011-07-22 10:49 ` Peter Zijlstra
2011-07-22 14:57 ` Peter Zijlstra [this message]
2011-07-22 17:45 ` Nicholas Mc Guire
2011-07-25 8:21 ` Peter Zijlstra
2011-07-23 0:39 ` Paul E. McKenney
2011-07-25 8:30 ` Peter Zijlstra
2011-07-25 21:17 ` Paul E. McKenney
2011-07-27 11:13 ` Peter Zijlstra
2011-07-27 18:30 ` Paul E. McKenney
2011-07-28 5:50 ` Yong Zhang
2011-07-28 7:01 ` Thomas Gleixner
2011-07-28 7:10 ` Yong Zhang
2011-07-28 7:54 ` Nicholas Mc Guire
2011-07-28 12:05 ` Paul E. McKenney
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