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From: Ingo Molnar <mingo@kernel.org>
To: Mike Galbraith <umgwanakikbuti@gmail.com>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Peter Zijlstra <peterz@infradead.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Vatika Harlalka <vatikaharlalka@gmail.com>,
	Chris Metcalf <cmetcalf@ezchip.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Preeti U Murthy <preeti@linux.vnet.ibm.com>,
	Christoph Lameter <cl@linux.com>
Subject: Re: [PATCH RESEND] sched/nohz: Affine unpinned timers to housekeepers
Date: Mon, 24 Aug 2015 09:41:41 +0200	[thread overview]
Message-ID: <20150824074141.GA19209@gmail.com> (raw)
In-Reply-To: <1440400997.3430.12.camel@gmail.com>


* Mike Galbraith <umgwanakikbuti@gmail.com> wrote:

> On Mon, 2015-08-24 at 08:44 +0200, Ingo Molnar wrote:
> 
> > the 'housekeeping CPU' is essentially the boot CPU. Yet we dedicate a full mask to 
> > it (housekeeping_mask - a variable mask to begin with) and recover the 
> > housekeeping CPU via:
> > 
> > +       return cpumask_any_and(housekeeping_mask, cpu_online_mask);
> 
> There can be, and had better be if box is big, multiple housekeepers.

Yes - but that does not seem to be possible via the code right now AFAICS, so at 
minimum it's incomplete.

Thanks,

	Ingo

  reply	other threads:[~2015-08-24  7:41 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-08-14  1:46 [PATCH RESEND] sched/nohz: Affine unpinned timers to housekeepers Frederic Weisbecker
2015-08-22 21:09 ` Ping: " Frederic Weisbecker
2015-08-23  1:22   ` Christoph Lameter
2015-08-23  5:40 ` Ingo Molnar
2015-08-23 16:01   ` Paul E. McKenney
2015-08-24  1:28     ` Frederic Weisbecker
2015-08-24  6:44     ` Ingo Molnar
2015-08-24  7:23       ` Mike Galbraith
2015-08-24  7:41         ` Ingo Molnar [this message]
2015-08-24  7:54           ` Mike Galbraith
2015-08-24  8:00             ` Ingo Molnar
2015-08-24 13:36       ` Frederic Weisbecker
2015-08-24 14:01         ` Mike Galbraith
2015-08-25  8:29         ` Ingo Molnar
2015-08-25 13:45           ` Frederic Weisbecker
2015-08-28  8:32             ` Ingo Molnar
2015-08-28 12:30               ` Frederic Weisbecker
2015-08-24 13:50       ` Paul E. McKenney
2015-08-24 14:04         ` Frederic Weisbecker
2015-08-24 15:45           ` Paul E. McKenney
2015-08-24  1:45   ` Frederic Weisbecker

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