linux-kernel - Re: [PATCH v7 02/11] task_isolation: add initial support

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Message-ID: <alpine.DEB.2.11.1510011416160.4500@nanos>
Date:	Thu, 1 Oct 2015 14:18:42 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Frederic Weisbecker <fweisbec@...il.com>
cc:	Chris Metcalf <cmetcalf@...hip.com>,
	Gilad Ben Yossef <giladb@...hip.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>, Tejun Heo <tj@...nel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Andy Lutomirski <luto@...capital.net>,
	linux-doc@...r.kernel.org, linux-api@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 02/11] task_isolation: add initial support

On Thu, 1 Oct 2015, Frederic Weisbecker wrote:
> On Mon, Sep 28, 2015 at 11:17:17AM -0400, Chris Metcalf wrote:
> > +
> > +	while (READ_ONCE(dev->next_event.tv64) != KTIME_MAX) {
> 
> You should add a function in tick-sched.c to get the next tick. This
> is supposed to be a private field.

Just to make it clear. Neither the above nor a similar check in
tick-sched.c is going to happen.

This busy waiting is just horrible. Get your act together and solve
the problems at the root and do not inflict your quick and dirty
'solutions' on us.

Thanks,

	tglx
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