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

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Message-ID: <20131002121625.GB21581@redhat.com>
Date:	Wed, 2 Oct 2013 14:16:25 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	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>,
	Steven Rostedt <rostedt@...dmis.org>,
	Viresh Kumar <viresh.kumar@...aro.org>, tony.luck@...el.com,
	bp@...en8.de
Subject: Re: [PATCH] hotplug: Optimize {get,put}_online_cpus()

On 10/01, Paul E. McKenney wrote:
>
> On Tue, Oct 01, 2013 at 08:07:50PM +0200, Oleg Nesterov wrote:
> > On 10/01, Peter Zijlstra wrote:
> > >
> > > On Tue, Oct 01, 2013 at 07:45:08PM +0200, Oleg Nesterov wrote:
> > > >
> > > > I tend to agree with Srivatsa... Without a strong reason it would be better
> > > > to preserve the current logic: "some time after" should not be after the
> > > > next CPU_DOWN/UP*. But I won't argue too much.
> > >
> > > Nah, I think breaking it is the right thing :-)
> >
> > I don't really agree but I won't argue ;)
>
> The authors of arch/x86/kernel/cpu/mcheck/mce.c would seem to be the
> guys who would need to complain, given that they seem to have the only
> use in 3.11.

mce_cpu_callback() is fine, it ignores POST_DEAD if CPU_TASKS_FROZEN.

Oleg.

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