From: Arjan van de Ven <arjan@linux.intel.com>
To: Kevin Hilman <khilman@ti.com>
Cc: Len Brown <len.brown@intel.com>,
linux-kernel@vger.kernel.org,
Amit Kucheria <amit.kucheria@linaro.org>,
Colin Cross <ccross@android.com>,
linux-tegra@vger.kernel.org, linux-pm@lists.linux-foundation.org,
linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 0/3] coupled cpuidle state support
Date: Tue, 13 Mar 2012 19:04:49 -0700 [thread overview]
Message-ID: <4F5FFCC1.2030702@linux.intel.com> (raw)
In-Reply-To: <8762e8kqi6.fsf@ti.com>
On 3/13/2012 4:52 PM, Kevin Hilman wrote:
> Checking the ready_count seemed like an easy way to do this, but did you
> have any other mechanisms in mind for CPUs to communicate that they've
> exited/aborted?
this indeed is the tricky part (which I warned about earlier);
I've spent quite a lot of time (weeks) to get this provably working for
an Intel system with similar requirements... and it's extremely unfunny,
and needed firmware support to close some of the race conditions.
I sure hope that hardware with these requirements is on the way out...
it's not very OS friendly.
WARNING: multiple messages have this Message-ID (diff)
From: Arjan van de Ven <arjan@linux.intel.com>
To: Kevin Hilman <khilman@ti.com>
Cc: Colin Cross <ccross@android.com>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-pm@lists.linux-foundation.org,
Len Brown <len.brown@intel.com>,
Santosh Shilimkar <santosh.shilimkar@ti.com>,
Amit Kucheria <amit.kucheria@linaro.org>,
Trinabh Gupta <g.trinabh@gmail.com>,
Deepthi Dharwar <deepthi@linux.vnet.ibm.com>,
linux-omap@vger.kernel.org, linux-tegra@vger.kernel.org
Subject: Re: [PATCH 0/3] coupled cpuidle state support
Date: Tue, 13 Mar 2012 19:04:49 -0700 [thread overview]
Message-ID: <4F5FFCC1.2030702@linux.intel.com> (raw)
In-Reply-To: <8762e8kqi6.fsf@ti.com>
On 3/13/2012 4:52 PM, Kevin Hilman wrote:
> Checking the ready_count seemed like an easy way to do this, but did you
> have any other mechanisms in mind for CPUs to communicate that they've
> exited/aborted?
this indeed is the tricky part (which I warned about earlier);
I've spent quite a lot of time (weeks) to get this provably working for
an Intel system with similar requirements... and it's extremely unfunny,
and needed firmware support to close some of the race conditions.
I sure hope that hardware with these requirements is on the way out...
it's not very OS friendly.
WARNING: multiple messages have this Message-ID (diff)
From: arjan@linux.intel.com (Arjan van de Ven)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 0/3] coupled cpuidle state support
Date: Tue, 13 Mar 2012 19:04:49 -0700 [thread overview]
Message-ID: <4F5FFCC1.2030702@linux.intel.com> (raw)
In-Reply-To: <8762e8kqi6.fsf@ti.com>
On 3/13/2012 4:52 PM, Kevin Hilman wrote:
> Checking the ready_count seemed like an easy way to do this, but did you
> have any other mechanisms in mind for CPUs to communicate that they've
> exited/aborted?
this indeed is the tricky part (which I warned about earlier);
I've spent quite a lot of time (weeks) to get this provably working for
an Intel system with similar requirements... and it's extremely unfunny,
and needed firmware support to close some of the race conditions.
I sure hope that hardware with these requirements is on the way out...
it's not very OS friendly.
next prev parent reply other threads:[~2012-03-14 2:04 UTC|newest]
Thread overview: 115+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-21 0:09 [PATCH 0/3] coupled cpuidle state support Colin Cross
2011-12-21 0:09 ` Colin Cross
2011-12-21 0:09 ` Colin Cross
2011-12-21 0:09 ` [PATCH 1/3] cpuidle: refactor out cpuidle_enter_state Colin Cross
2011-12-21 0:09 ` Colin Cross
2011-12-21 0:09 ` Colin Cross
2012-01-04 14:08 ` Jean Pihet
2012-01-04 14:08 ` [linux-pm] " Jean Pihet
2012-01-04 14:08 ` Jean Pihet
[not found] ` <1324426147-16735-1-git-send-email-ccross-z5hGa2qSFaRBDgjK7y7TUQ@public.gmane.org>
2011-12-21 0:09 ` [PATCH 2/3] cpuidle: fix error handling in __cpuidle_register_device Colin Cross
2011-12-21 0:09 ` Colin Cross
2011-12-21 0:09 ` Colin Cross
2011-12-21 0:09 ` Colin Cross
2011-12-21 0:09 ` [PATCH 3/3] cpuidle: add support for states that affect multiple cpus Colin Cross
2011-12-21 0:09 ` Colin Cross
2011-12-21 0:09 ` Colin Cross
2011-12-21 9:02 ` [PATCH 0/3] coupled cpuidle state support Arjan van de Ven
2011-12-21 9:02 ` Arjan van de Ven
2011-12-21 9:02 ` Arjan van de Ven
[not found] ` <4EF1A0B4.5080307-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2011-12-21 9:40 ` Colin Cross
2011-12-21 9:40 ` Colin Cross
2011-12-21 9:40 ` Colin Cross
2011-12-21 9:44 ` Arjan van de Ven
2011-12-21 9:44 ` Arjan van de Ven
2011-12-21 9:44 ` Arjan van de Ven
[not found] ` <4EF1AA8A.8060304-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2011-12-21 9:55 ` Colin Cross
2011-12-21 9:55 ` Colin Cross
2011-12-21 9:55 ` Colin Cross
2011-12-21 12:12 ` Arjan van de Ven
2011-12-21 12:12 ` Arjan van de Ven
2011-12-21 12:12 ` Arjan van de Ven
2011-12-21 19:05 ` Colin Cross
2011-12-21 19:05 ` Colin Cross
2011-12-21 19:05 ` Colin Cross
[not found] ` <CAMbhsRRnKoR3YPWrZzVynVe+dcuU5v0siYvmp2vbBcS1hquC7Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-12-21 19:36 ` Arjan van de Ven
2011-12-21 19:36 ` Arjan van de Ven
2011-12-21 19:36 ` Arjan van de Ven
2011-12-21 19:42 ` Colin Cross
2011-12-21 19:42 ` [linux-pm] " Colin Cross
2011-12-21 19:42 ` Colin Cross
[not found] ` <CAMbhsRSPCo9MSGp57Fv0sRdYUFcdwx8jEz1-CfX8LdKf8X4MVg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-12-22 8:35 ` Shilimkar, Santosh
2011-12-22 8:35 ` Shilimkar, Santosh
2011-12-22 8:35 ` Shilimkar, Santosh
2011-12-22 8:53 ` Arjan van de Ven
2011-12-22 8:53 ` [linux-pm] " Arjan van de Ven
2011-12-22 8:53 ` Arjan van de Ven
2011-12-22 9:30 ` Shilimkar, Santosh
2011-12-22 9:30 ` [linux-pm] " Shilimkar, Santosh
2011-12-22 9:30 ` Shilimkar, Santosh
2011-12-22 21:20 ` Colin Cross
[not found] ` <4EF2F01E.8060307-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2011-12-22 21:20 ` [linux-pm] " Colin Cross
2011-12-22 21:20 ` Colin Cross
2011-12-22 21:20 ` Colin Cross
2011-12-22 8:35 ` Shilimkar, Santosh
2011-12-21 19:36 ` Arjan van de Ven
[not found] ` <4EF1CD49.9020800-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2012-03-14 0:39 ` Colin Cross
2012-03-14 0:39 ` Colin Cross
2012-03-14 0:39 ` Colin Cross
2011-12-21 9:55 ` Colin Cross
2011-12-21 9:40 ` Colin Cross
2012-01-04 0:41 ` Kevin Hilman
2012-01-04 0:41 ` Kevin Hilman
2012-01-04 0:41 ` Kevin Hilman
2012-01-04 17:27 ` Shilimkar, Santosh
2012-01-04 17:27 ` Shilimkar, Santosh
2012-01-04 17:27 ` Shilimkar, Santosh
2012-01-20 8:46 ` Daniel Lezcano
2012-01-20 8:46 ` Daniel Lezcano
2012-01-20 8:46 ` Daniel Lezcano
2012-01-20 20:40 ` Colin Cross
2012-01-20 20:40 ` Colin Cross
2012-01-20 20:40 ` Colin Cross
2012-01-25 14:04 ` Daniel Lezcano
2012-01-25 14:04 ` Daniel Lezcano
2012-01-31 14:13 ` Daniel Lezcano
2012-01-31 14:13 ` Daniel Lezcano
[not found] ` <CAMbhsRTbVqV6p0py9NGZrpFPf2yvp-B0dr+o-m7qbdja_-Lfzw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-01-27 8:54 ` [linux-pm] " Vincent Guittot
2012-01-27 8:54 ` Vincent Guittot
2012-01-27 8:54 ` Vincent Guittot
2012-01-27 17:32 ` Colin Cross
2012-01-27 17:32 ` Colin Cross
2012-01-27 17:32 ` Colin Cross
[not found] ` <CAMbhsRQYVXTZ2pX4mBrM6=SyGTqn_GY8xsW4rt_e21zerEzctA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-02-01 12:13 ` Vincent Guittot
2012-02-01 12:13 ` Vincent Guittot
2012-02-01 12:13 ` Vincent Guittot
2012-02-01 14:59 ` Lorenzo Pieralisi
2012-02-01 14:59 ` [linux-pm] " Lorenzo Pieralisi
2012-02-01 14:59 ` Lorenzo Pieralisi
2012-02-01 17:30 ` Colin Cross
2012-02-01 17:30 ` Colin Cross
2012-02-01 17:30 ` Colin Cross
2012-02-01 18:07 ` Lorenzo Pieralisi
2012-02-01 18:07 ` [linux-pm] " Lorenzo Pieralisi
2012-02-01 18:07 ` Lorenzo Pieralisi
2012-02-03 1:19 ` Colin Cross
2012-02-03 1:19 ` [linux-pm] " Colin Cross
2012-02-03 1:19 ` Colin Cross
2012-03-13 23:52 ` Kevin Hilman
2012-03-13 23:52 ` Kevin Hilman
[not found] ` <8762e8kqi6.fsf-l0cyMroinI0@public.gmane.org>
2012-03-14 0:28 ` Colin Cross
2012-03-14 0:28 ` Colin Cross
2012-03-14 0:28 ` Colin Cross
2012-03-14 0:47 ` Colin Cross
2012-03-14 0:47 ` Colin Cross
2012-03-14 0:47 ` Colin Cross
[not found] ` <CAMbhsRRD2bdkcUZvScb-cF05e=R3h69bNVaTPFX4jBKBBOjuMg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-03-14 14:23 ` [linux-pm] " Kevin Hilman
2012-03-14 14:23 ` Kevin Hilman
2012-03-14 14:23 ` Kevin Hilman
2012-03-14 2:04 ` Arjan van de Ven [this message]
2012-03-14 2:04 ` Arjan van de Ven
2012-03-14 2:04 ` Arjan van de Ven
2012-03-14 2:21 ` Colin Cross
2012-03-14 2:21 ` Colin Cross
2012-03-14 2:21 ` Colin Cross
2011-12-21 0:09 Colin Cross
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