From: Thomas Gleixner <tglx@linutronix.de>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Peter Zijlstra <peterz@infradead.org>,
Vincent Guittot <vincent.guittot@linaro.org>,
linux-kernel@vger.kernel.org, linux-hotplug@vger.kernel.org,
Frederic Weisbecker <fweisbec@gmail.com>,
Steven Rostedt <rostedt@goodmis.org>,
amit.kucheria@linaro.org, Rusty Russell <rusty@rustcorp.com.au>,
Ingo Molnar <mingo@elte.hu>
Subject: Re: [PATCH V5 2/2] tracing, perf : add cpu hotplug trace events
Date: Thu, 24 Feb 2011 20:16:01 +0000 [thread overview]
Message-ID: <alpine.LFD.2.00.1102242115011.2701@localhost6.localdomain6> (raw)
In-Reply-To: <20110224201124.138311ba@lxorguk.ukuu.org.uk>
On Thu, 24 Feb 2011, Alan Cox wrote:
> > Anybody who is interested in the latency of cpu hotplug is deluding
> > himself, also cpu hotplug is _NOT_ a power management feature, so the
> > rest of your justification just disappeared as well.
>
> Actually CPU hotplug is a power management feature on some devices where
> you need to shutdown one of the cores to enter low power modes.
Right.
> Remember we use it as part of the suspend paths and various processors
> nowdays drop into a suspend to RAM type state on CPU idling.
The suspend path is using it, but the cpu idle one is hardly using the
hotplug muck.
Thanks,
tglx
next prev parent reply other threads:[~2011-02-24 20:16 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-24 17:33 [PATCH V5 2/2] tracing, perf : add cpu hotplug trace events Vincent Guittot
2011-02-24 18:40 ` Thomas Gleixner
2011-02-28 13:36 ` Vincent Guittot
2011-03-02 10:08 ` Thomas Gleixner
2011-03-02 19:02 ` Vincent Guittot
2011-03-02 21:12 ` Thomas Gleixner
2011-02-24 18:46 ` Peter Zijlstra
2011-02-24 20:11 ` Alan Cox
2011-02-24 20:16 ` Thomas Gleixner [this message]
2011-02-24 20:24 ` Nicolas Pitre
2011-02-24 20:30 ` Peter Zijlstra
2011-02-24 20:40 ` Alan Cox
2011-02-24 20:40 ` Nicolas Pitre
2011-02-24 20:49 ` Peter Zijlstra
2011-02-24 20:49 ` Thomas Gleixner
2011-02-24 21:04 ` Alan Cox
2011-02-24 21:12 ` Thomas Gleixner
2011-02-24 21:17 ` Peter Zijlstra
2011-02-24 21:33 ` Thomas Gleixner
2011-02-24 20:47 ` Thomas Gleixner
2011-02-24 20:58 ` Peter Zijlstra
2011-02-24 21:03 ` Thomas Gleixner
2011-02-24 21:11 ` Paul E. McKenney
2011-02-24 20:27 ` Peter Zijlstra
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