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Date: Thu, 10 Oct 2013 18:50:46 +0200
From: Ingo Molnar <mingo@...nel.org>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Oleg Nesterov <oleg@...hat.com>,
Paul McKenney <paulmck@...ux.vnet.ibm.com>,
Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
Andrea Arcangeli <aarcange@...hat.com>,
Johannes Weiner <hannes@...xchg.org>,
Thomas Gleixner <tglx@...utronix.de>,
Steven Rostedt <rostedt@...dmis.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/6] Optimize the cpu hotplug locking -v2
* Peter Zijlstra <peterz@...radead.org> wrote:
> On Thu, Oct 10, 2013 at 04:57:38PM +0200, Ingo Molnar wrote:
>
> > So ... why not make it _really_ cheap, i.e. the read lock costing
> > nothing, and tie CPU hotplug to freezing all tasks in the system?
>
> Such that we freeze regular tasks in userspace and kernel tasks in their
> special freezer callback so as to guarantee minimal state?
Yes, absolutely.
Thanks,
Ingo
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