linux-kernel - Re: [PATCH v14 04/14] task_isolation: add initial support

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Message-ID: <alpine.DEB.2.20.1608111349190.1644@east.gentwo.org>
Date:	Thu, 11 Aug 2016 13:50:10 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
cc:	Chris Metcalf <cmetcalf@...lanox.com>,
	Gilad Ben Yossef <giladb@...lanox.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>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Andy Lutomirski <luto@...capital.net>,
	Michal Hocko <mhocko@...e.com>, linux-mm@...ck.org,
	linux-doc@...r.kernel.org, linux-api@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v14 04/14] task_isolation: add initial support

On Thu, 11 Aug 2016, Frederic Weisbecker wrote:

> Do we need to quiesce vmstat everytime before entering userspace?
> I thought that vmstat only need to be offlined once and for all?

Once is sufficient after disabling the tick.