linux-kernel - Re: [PATCH] hotplug: Optimize {get,put}_online

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Message-ID: <20130925153533.GN3081@twins.programming.kicks-ass.net>
Date:	Wed, 25 Sep 2013 17:35:33 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] hotplug: Optimize {get,put}_online_cpus()

On Wed, Sep 25, 2013 at 05:16:42PM +0200, Oleg Nesterov wrote:
> Yes, but my point was, this can only happen in recursive fast path.

Right, I understood.

> And in this case (I think) we do not care, we are already in the critical
> section.

I tend to agree, however paranoia..

> OK, please forget. I guess I will never understand this ;)

It might just be I'm less certain about there not being any avenue of
mischief.
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