From: Viresh Kumar <viresh.kumar@linaro.org>
To: ansuelsmth@gmail.com
Cc: 'Sibi Sankar' <sibis@codeaurora.org>,
vincent.guittot@linaro.org, saravanak@google.com,
'Sudeep Holla' <sudeep.holla@arm.com>,
"'Rafael J. Wysocki'" <rjw@rjwysocki.net>,
'Rob Herring' <robh+dt@kernel.org>,
linux-pm@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: R: [RFC PATCH v3 0/2] Add Krait Cache Scaling support
Date: Thu, 3 Sep 2020 12:23:14 +0530 [thread overview]
Message-ID: <20200903065314.y3ynhwydahaeg6o6@vireshk-i7> (raw)
In-Reply-To: <039d01d67f6a$188700d0$49950270$@gmail.com>
On 31-08-20, 09:41, ansuelsmth@gmail.com wrote:
> On 31-08-20, Sibi wrote:
> > On 2020-08-24 16:10, Viresh Kumar wrote:
> > > +Vincent/Saravana/Sibi
> > >
> > > On 21-08-20, 16:00, Ansuel Smith wrote:
> > >> This adds Krait Cache scaling support using the cpufreq notifier.
> > >> I have some doubt about where this should be actually placed (clk or
> > >> cpufreq)?
> > >> Also the original idea was to create a dedicated cpufreq driver (like
> > >> it's done in
> > >> the codeaurora qcom repo) by copying the cpufreq-dt driver and adding
> > >> the cache
> > >> scaling logic but i still don't know what is better. Have a very
> > >> similar driver or
> > >> add a dedicated driver only for the cache using the cpufreq notifier
> > >> and do the
> > >> scale on every freq transition.
> > >> Thanks to everyone who will review or answer these questions.
> > >
> > > Saravana was doing something with devfreq to solve such issues if I
> > > wasn't mistaken.
> > >
> > > Sibi ?
> >
> > IIRC the final plan was to create a devfreq device
> > and devfreq-cpufreq based governor to scale them, this
> > way one can switch to a different governor if required.
>
> So in this case I should convert this patch to a devfreq driver-
I think this should happen nevertheless. You are doing DVFS for a
device which isn't a CPU and devfreq looks to be the right place of
doing so.
> Isn't overkill to use a governor for such a task?
> (3 range based on the cpufreq?)
I am not sure about the governor part here, maybe it won't be required
?
--
viresh
next prev parent reply other threads:[~2020-09-03 6:53 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-21 14:00 [RFC PATCH v3 0/2] Add Krait Cache Scaling support Ansuel Smith
2020-08-21 14:00 ` [RFC PATCH v3 1/2] cpufreq: qcom: " Ansuel Smith
2020-08-21 14:00 ` [RFC PATCH v3 2/2] dt-bindings: cpufreq: Document Krait CPU Cache scaling Ansuel Smith
2020-08-24 17:28 ` Rob Herring
2020-08-24 10:40 ` [RFC PATCH v3 0/2] Add Krait Cache Scaling support Viresh Kumar
2020-08-31 5:45 ` Sibi Sankar
2020-08-31 7:41 ` R: " ansuelsmth
2020-09-03 6:53 ` Viresh Kumar [this message]
2020-09-03 7:13 ` Sibi Sankar
2020-09-03 11:00 ` R: " ansuelsmth
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=20200903065314.y3ynhwydahaeg6o6@vireshk-i7 \
--to=viresh.kumar@linaro.org \
--cc=ansuelsmth@gmail.com \
--cc=devicetree@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pm@vger.kernel.org \
--cc=rjw@rjwysocki.net \
--cc=robh+dt@kernel.org \
--cc=saravanak@google.com \
--cc=sibis@codeaurora.org \
--cc=sudeep.holla@arm.com \
--cc=vincent.guittot@linaro.org \
/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;
as well as URLs for NNTP newsgroup(s).