linux-kernel - Re: [PATCH] nohz1: Documentation

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Date:	Thu, 21 Mar 2013 18:53:22 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Steven Rostedt <rostedt@...dmis.org>
cc:	paulmck@...ux.vnet.ibm.com,
	Frederic Weisbecker <fweisbec@...il.com>,
	Rob Landley <rob@...dley.net>, linux-kernel@...r.kernel.org,
	josh@...htriplett.org, zhong@...ux.vnet.ibm.com,
	khilman@...aro.org, geoff@...radead.org, tglx@...utronix.de
Subject: Re: [PATCH] nohz1: Documentation

On Thu, 21 Mar 2013, Steven Rostedt wrote:

> For now, no, if more than one process is scheduled on the CPU, we fall
> out of dynamic tick mode. In the future, we can add SCHED_FIFO task
> scheduled in to trigger it. But lets conquer that after we successfully
> conquer the current changes.

Be glad to see whatever is possible merged as soon as possible. But be
aware that we will fall out of dyntick mode at mininum every 2 seconds
because that is when the per cpu vm stats and the slab scanning is
occurring. These are both deferrable activities.


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