linux-kernel - Re: [PATCH] sched/rt: don't try to balance rt

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Message-ID: <1400402201.5166.13.camel@marge.simpson.net>
Date:	Sun, 18 May 2014 10:36:41 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Paul Gortmaker <paul.gortmaker@...driver.com>,
	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] sched/rt: don't try to balance rt_runtime when it is
 futile

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.

-Mike

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