From: Peter Zijlstra <peterz@infradead.org>
To: Salman Qazi <sqazi@google.com>
Cc: Andi Kleen <andi@firstfloor.org>,
mingo@elte.hu, linux-kernel@vger.kernel.org,
akpm@linux-foundation.org, svaidy@linux.vnet.ibm.com,
linux-pm@lists.linux-foundation.org, arjan@infradead.org,
csadler@google.com, ranjitm@google.com, kenchen@google.com,
dawnchen@google.com
Subject: Re: [PATCH 1/3] [kidled]: introduce kidled.
Date: Thu, 15 Apr 2010 09:46:51 +0200 [thread overview]
Message-ID: <1271317611.32749.68.camel@laptop> (raw)
In-Reply-To: <o2y4352991a1004140841w7f37b84cnedcd91c2638a07ea@mail.gmail.com>
On Wed, 2010-04-14 at 08:41 -0700, Salman Qazi wrote:
>
> To capture all the quantities for a CPU atomically, they must be read
> on the CPU. Basically, reading them on that CPU prevents them from
> changing as we read them.
>
> Also, if the CPU is idle (injected or otherwise), the quantities won't
> get updated.
Who cares? by the time they reach userspace they've changed anyway.
next prev parent reply other threads:[~2010-04-15 7:46 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-14 0:08 [PATCH 0/3] [idled]: Idle Cycle Injector for power capping Salman
2010-04-14 0:08 ` [PATCH 1/3] [kidled]: introduce kidled Salman
2010-04-14 0:08 ` Salman
2010-04-14 9:49 ` Andi Kleen
2010-04-14 9:49 ` Andi Kleen
2010-04-14 15:41 ` Salman Qazi
2010-04-14 15:41 ` Salman Qazi
2010-04-15 7:46 ` Peter Zijlstra [this message]
2010-04-15 7:46 ` Peter Zijlstra
2010-04-14 0:08 ` [PATCH 2/3] [kidled]: Add eager injection Salman
2010-04-14 0:08 ` Salman
2010-04-14 0:08 ` [PATCH 3/3] [kidled]: Introduce power capping priority and LB awareness Salman
2010-04-14 0:08 ` Salman
2010-04-15 7:51 ` [PATCH 0/3] [idled]: Idle Cycle Injector for power capping Peter Zijlstra
2010-04-15 7:51 ` Peter Zijlstra
2010-04-17 17:08 ` tytso
2010-04-17 17:57 ` Arjan van de Ven
2010-04-17 17:57 ` Arjan van de Ven
2010-04-17 19:51 ` Peter Zijlstra
2010-04-17 19:51 ` Peter Zijlstra
2010-04-17 17:08 ` tytso
2010-04-19 17:20 ` Salman Qazi
2010-04-19 19:01 ` Peter Zijlstra
2010-04-20 1:00 ` Arjan van de Ven
2010-04-20 5:00 ` Vaidyanathan Srinivasan
2010-04-20 5:00 ` Vaidyanathan Srinivasan
2010-04-20 1:00 ` Arjan van de Ven
2010-04-20 4:50 ` Vaidyanathan Srinivasan
2010-04-20 17:52 ` Salman Qazi
2010-04-21 5:08 ` Arjan van de Ven
2010-04-21 5:08 ` Arjan van de Ven
2010-04-20 17:52 ` Salman Qazi
2010-04-20 4:50 ` Vaidyanathan Srinivasan
2010-04-19 19:01 ` Peter Zijlstra
2010-04-19 17:20 ` Salman Qazi
2010-04-22 1:32 ` Mike Chan
2010-04-22 8:21 ` Peter Zijlstra
2010-04-22 8:21 ` Peter Zijlstra
2010-04-22 19:02 ` Vaidyanathan Srinivasan
2010-04-22 19:02 ` Vaidyanathan Srinivasan
2010-04-22 1:32 ` Mike Chan
2010-04-17 16:40 ` Arjan van de Ven
2010-04-17 16:40 ` Arjan van de Ven
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