linux-kernel - Re: [PATCH v8 04/14] task_isolation: add initial support

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Message-ID: <562E9761.1060601@ezchip.com>
Date:	Mon, 26 Oct 2015 17:13:05 -0400
From:	Chris Metcalf <cmetcalf@...hip.com>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Andy Lutomirski <luto@...capital.net>
CC:	Gilad Ben Yossef <giladb@...hip.com>,
	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>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"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>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Linux API <linux-api@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 04/14] task_isolation: add initial support

On 10/20/2015 08:29 PM, Steven Rostedt wrote:
> Also, doesn't RCU need to have a few ticks go by before it can safely
> disable itself from userspace? I recall something like that. Paul?

The current patch series supports that by testing tick_nohz_tick_stopped(),
which internally only becomes true after tick_nohz_stop_sched_tick()
manages to stop the tick, and it won't if rcu_needs_cpu() is true.

-- 
Chris Metcalf, EZChip Semiconductor
http://www.ezchip.com

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