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

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Message-ID: <20140518155815.GK4570@linux.vnet.ibm.com>
Date:	Sun, 18 May 2014 08:58:15 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Mike Galbraith <umgwanakikbuti@...il.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 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

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