From: Daniel Lezcano <daniel.lezcano@linaro.org>
To: Mike Turquette <mturquette@ti.com>
Cc: linux-kernel@vger.kernel.org,
linux-pm@lists.linux-foundation.org, gregkh@suse.de,
linaro-dev@lists.linaro.org, patches@linaro.org
Subject: Re: [PATCH v2 1/2] cpumask: introduce cpumask for hotpluggable CPUs
Date: Wed, 10 Aug 2011 22:53:31 +0200 [thread overview]
Message-ID: <4E42EFCB.1030005@linaro.org> (raw)
In-Reply-To: <1313006614-28702-2-git-send-email-mturquette@ti.com>
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On 08/10/2011 10:03 PM, Mike Turquette wrote:
> On some platforms it is possible to have some CPUs which support CPU
> hotplug and some which do not. Currently the prescence of an 'online'
> sysfs entry in userspace is adequate for applications to know that a CPU
> supports hotplug, but there is no convenient way to make the same
> determination in the kernel.
>
> To better model this relationship this patch introduces a new cpumask to
> track CPUs that support CPU hotplug operations.
>
> This new cpumask is populated at boot-time and remains static for the
> life of the machine. Bits set in the mask indicate a CPU which supports
> hotplug, but make no guarantees about whether that CPU is currently
> online or not. Likewise a cleared bit in the mask indicates either a
> CPU which cannot hotplug or a lack of a populated CPU.
>
> The purpose of this new cpumask is to aid kernel code which uses CPU to
> take CPUs online and offline. Possible uses are as a thermal event
> mitigation technique or as a power capping mechanism.
>
> Signed-off-by: Mike Turquette <mturquette@ti.com>
Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org>
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next prev parent reply other threads:[~2011-08-10 20:53 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-10 20:03 [PATCH v2 0/2] new cpumask for hotpluggable CPUs Mike Turquette
2011-08-10 20:03 ` [PATCH v2 1/2] cpumask: introduce " Mike Turquette
2011-08-10 20:53 ` Daniel Lezcano [this message]
2011-08-10 20:53 ` Daniel Lezcano
2011-08-11 6:06 ` Amit Kucheria
2011-08-11 6:06 ` Amit Kucheria
2011-08-11 18:39 ` Turquette, Mike
2011-08-11 18:39 ` Turquette, Mike
2011-08-10 20:03 ` Mike Turquette
2011-08-10 20:03 ` [PATCH v2 2/2] cpu: update cpu_hotpluggable_mask in register_cpu Mike Turquette
2011-08-10 20:03 ` Mike Turquette
2011-08-10 20:54 ` Daniel Lezcano
2011-08-10 20:54 ` Daniel Lezcano
2011-08-11 18:30 ` [PATCH v2 0/2] new cpumask for hotpluggable CPUs Peter Zijlstra
2011-08-11 19:25 ` Turquette, Mike
2011-08-11 19:25 ` Turquette, Mike
2011-08-11 19:38 ` Peter Zijlstra
2011-08-11 19:38 ` Peter Zijlstra
2011-08-11 18:30 ` Peter Zijlstra
2011-08-11 19:54 ` [PATCH v3 1/2] cpumask: introduce " Mike Turquette
2011-08-11 19:54 ` [PATCH v3 2/2] cpu: update cpu_hotpluggable_mask in register_cpu Mike Turquette
2011-08-11 19:54 ` Mike Turquette
2011-08-11 20:02 ` [PATCH v3 1/2] cpumask: introduce cpumask for hotpluggable CPUs Peter Zijlstra
2011-08-11 20:02 ` Peter Zijlstra
2011-08-11 19:54 ` Mike Turquette
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