From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Mike Galbraith <umgwanakikbuti@gmail.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>,
linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org,
Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Steven Rostedt <rostedt@goodmis.org>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH] sched/rt: don't try to balance rt_runtime when it is futile
Date: Sun, 18 May 2014 08:58:15 -0700 [thread overview]
Message-ID: <20140518155815.GK4570@linux.vnet.ibm.com> (raw)
In-Reply-To: <1400402201.5166.13.camel@marge.simpson.net>
On Sun, May 18, 2014 at 10:36:41AM +0200, Mike Galbraith wrote:
> On Sat, 2014-05-17 at 22:20 -0700, Paul E. McKenney wrote:
>
> > If you are saying that turning on nohz_full doesn't help unless you
> > also ensure that there is only one runnable task per CPU, I completely
> > agree. If you are saying something else, you lost me. ;-)
>
> Yup, that's it more or less. It's not only single task loads that could
> benefit from better isolation, but if isolation improving measures are
> tied to nohz_full, other sensitive loads will suffer if they try to use
> isolation improvements.
So you are arguing for a separate Kconfig variable that does the isolation?
So that NO_HZ_FULL selects this new variable, and (for example) RCU
uses this new variable to decide when to pin the grace-period kthreads
onto the housekeeping CPU?
Thanx, Paul
next prev parent reply other threads:[~2014-05-18 15:58 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-14 15:08 [PATCH] sched/rt: don't try to balance rt_runtime when it is futile Paul Gortmaker
2014-05-14 15:44 ` Paul E. McKenney
2014-05-14 19:11 ` Paul Gortmaker
2014-05-14 19:27 ` Paul E. McKenney
2014-05-15 2:49 ` Mike Galbraith
2014-05-15 14:09 ` Paul Gortmaker
2014-11-27 9:17 ` Wanpeng Li
2014-11-27 15:31 ` Mike Galbraith
2014-11-27 11:36 ` Wanpeng Li
2014-05-15 3:18 ` Mike Galbraith
2014-05-15 14:45 ` Paul E. McKenney
2014-05-15 17:27 ` Mike Galbraith
2014-05-18 4:22 ` Mike Galbraith
2014-05-18 5:20 ` Paul E. McKenney
2014-05-18 8:36 ` Mike Galbraith
2014-05-18 15:58 ` Paul E. McKenney [this message]
2014-05-19 2:44 ` Mike Galbraith
2014-05-19 5:34 ` Paul E. McKenney
2014-05-20 14:53 ` Frederic Weisbecker
2014-05-20 15:53 ` Paul E. McKenney
2014-05-20 16:24 ` Frederic Weisbecker
2014-05-20 16:36 ` Peter Zijlstra
2014-05-20 17:20 ` Paul E. McKenney
2014-05-21 4:29 ` Mike Galbraith
2014-05-21 4:18 ` Mike Galbraith
2014-05-21 12:03 ` Paul E. McKenney
2014-05-21 3:52 ` Mike Galbraith
2014-05-19 10:54 ` Peter Zijlstra
2014-05-19 12:40 ` Peter Zijlstra
2014-05-22 19:40 ` Paul Gortmaker
2014-11-27 11:21 ` Wanpeng Li
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