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: 22+ 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 9:49 ` Andi Kleen
2010-04-14 15:41 ` Salman Qazi
2010-04-15 7:46 ` Peter Zijlstra [this message]
2010-04-14 0:08 ` [PATCH 2/3] [kidled]: Add eager injection Salman
2010-04-14 0:08 ` [PATCH 3/3] [kidled]: Introduce power capping priority and LB awareness Salman
2010-04-15 7:51 ` [PATCH 0/3] [idled]: Idle Cycle Injector for power capping Peter Zijlstra
2010-04-17 17:08 ` tytso
2010-04-17 17:57 ` Arjan van de Ven
2010-04-17 19:51 ` Peter Zijlstra
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 4:50 ` Vaidyanathan Srinivasan
2010-04-20 17:52 ` Salman Qazi
2010-04-21 5:08 ` Arjan van de Ven
2010-04-22 1:32 ` Mike Chan
2010-04-22 8:21 ` Peter Zijlstra
2010-04-22 19:02 ` Vaidyanathan Srinivasan
2010-04-17 16:40 ` Arjan van de Ven
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1271317611.32749.68.camel@laptop \
--to=peterz@infradead.org \
--cc=akpm@linux-foundation.org \
--cc=andi@firstfloor.org \
--cc=arjan@infradead.org \
--cc=csadler@google.com \
--cc=dawnchen@google.com \
--cc=kenchen@google.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pm@lists.linux-foundation.org \
--cc=mingo@elte.hu \
--cc=ranjitm@google.com \
--cc=sqazi@google.com \
--cc=svaidy@linux.vnet.ibm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox