From: Arjan van de Ven <arjan@linux.intel.com>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Vincent Guittot <vincent.guittot@linaro.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@kernel.org>, Paul Turner <pjt@google.com>,
Morten Rasmussen <Morten.Rasmussen@arm.com>,
Chris Metcalf <cmetcalf@tilera.com>,
Tony Luck <tony.luck@intel.com>,
"alex.shi@intel.com" <alex.shi@intel.com>,
Preeti U Murthy <preeti@linux.vnet.ibm.com>,
linaro-kernel <linaro-kernel@lists.linaro.org>,
"len.brown@intel.com" <len.brown@intel.com>,
"l.majewski@samsung.com" <l.majewski@samsung.com>,
Jonathan Corbet <corbet@lwn.net>,
"Rafael J. Wysocki" <rjw@sisk.pl>,
Paul McKenney <paulmck@linux.vnet.ibm.com>,
"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>
Subject: Re: [RFC][PATCH v5 00/14] sched: packing tasks
Date: Mon, 11 Nov 2013 10:20:17 -0800 [thread overview]
Message-ID: <52811FE1.2020404@linux.intel.com> (raw)
In-Reply-To: <20131111181805.GE29572@arm.com>
On 11/11/2013 10:18 AM, Catalin Marinas wrote:
>
> Even for symmetric configuration, the cost of moving a task to a CPU
> includes wake-up cost plus the run-time cost which depends on the
> P-state after wake-up (that's much trickier since we can't easily
> estimate the cost of a P-state and it may change once you place a task
> on it).
yup including cache refill times (assuming you picked C states
that flushed the cache, which will be the common case... but even
if not, since you're moving at task the likelyhood of cache coldness is high)
next prev parent reply other threads:[~2013-11-11 18:20 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1382097147-30088-1-git-send-email-vincent.guittot@linaro.org>
2013-11-11 11:33 ` [RFC][PATCH v5 00/14] sched: packing tasks Catalin Marinas
2013-11-11 16:36 ` Peter Zijlstra
2013-11-11 16:39 ` Arjan van de Ven
2013-11-11 18:18 ` Catalin Marinas
2013-11-11 18:20 ` Arjan van de Ven [this message]
2013-11-12 12:06 ` Morten Rasmussen
2013-11-12 16:48 ` Arjan van de Ven
2013-11-12 23:14 ` Catalin Marinas
2013-11-13 16:13 ` Arjan van de Ven
2013-11-13 16:45 ` Catalin Marinas
2013-11-13 17:56 ` Arjan van de Ven
2013-11-12 17:40 ` Catalin Marinas
2013-11-25 18:55 ` Daniel Lezcano
2013-11-11 16:38 ` Peter Zijlstra
2013-11-11 16:40 ` Arjan van de Ven
2013-11-12 10:36 ` Vincent Guittot
2013-11-11 16:54 ` Morten Rasmussen
2013-11-11 18:31 ` Catalin Marinas
2013-11-11 19:26 ` Arjan van de Ven
2013-11-11 22:43 ` Nicolas Pitre
2013-11-11 23:43 ` Catalin Marinas
2013-11-12 12:35 ` Vincent Guittot
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