linux-kernel - Re: [PATCH] rcu: Is it safe to enter an RCU read-side critical section?

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Date:	Tue, 10 Sep 2013 06:07:04 +0200
From:	Mike Galbraith <mgalbraith@...e.de>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...icios.com, josh@...htriplett.org,
	niv@...ibm.com, tglx@...utronix.de, rostedt@...dmis.org,
	dhowells@...hat.com, edumazet@...gle.com, darren@...art.com,
	sbw@....edu
Subject: Re: [PATCH] rcu: Is it safe to enter an RCU read-side critical
 section?

On Mon, 2013-09-09 at 14:49 +0000, Christoph Lameter wrote:

> Its just that PREEMPT kernels are
> not in use and AFAICT the full preempt stuff requires significant developer
> support and complicates the code without much benefit.

The openSUSE desktop kernel is PREEMPT, and presumably has users.

I use VOLUNTARY for my desktop, having zero tight latency constraints,
and not being into inflicting needless pain on poor defenseless boxen,
but lots of folks do use PREEMPT, and some of them may even need it.

-Mike

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