linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
To: Quentin Perret <quentin.perret@arm.com>
Cc: Greg KH <gregkh@linuxfoundation.org>,
	rafael@kernel.org, peterz@infradead.org, mingo@redhat.com,
	linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
	dietmar.eggemann@arm.com
Subject: Re: [PATCH v2] PM / EM: Expose the Energy Model in debugfs
Date: Thu, 24 Jan 2019 11:45:56 +0100	[thread overview]
Message-ID: <3845915.x0TneKyrcv@aspire.rjw.lan> (raw)
In-Reply-To: <20190123092834.hj5v6lup4422wrmf@queper01-lin>

On Wednesday, January 23, 2019 10:28:36 AM CET Quentin Perret wrote:
> On Tuesday 22 Jan 2019 at 19:41:36 (+0100), Greg KH wrote:
> > On Tue, Jan 22, 2019 at 04:42:47PM +0000, Quentin Perret wrote:
> > > The recently introduced Energy Model (EM) framework manages power cost
> > > tables of CPUs. These tables are currently only visible from kernel
> > > space. However, in order to debug the behaviour of subsystems that use
> > > the EM (EAS for example), it is often required to know what the power
> > > costs are from userspace.
> > > 
> > > For this reason, introduce under /sys/kernel/debug/energy_model a set of
> > > directories representing the performance domains of the system. Each
> > > performance domain contains a set of sub-directories representing the
> > > different capacity states (cs) and their attributes, as well as a file
> > > exposing the related CPUs.
> > > 
> > > The resulting hierarchy is as follows on Arm juno r0 for example:
> > > 
> > >     /sys/kernel/debug/energy_model
> > >     ├── pd0
> > >     │   ├── cpus
> > >     │   ├── cs:450000
> > >     │   │   ├── cost
> > >     │   │   ├── frequency
> > >     │   │   └── power
> > >     │   ├── cs:575000
> > >     │   │   ├── cost
> > >     │   │   ├── frequency
> > >     │   │   └── power
> > >     │   ├── cs:700000
> > >     │   │   ├── cost
> > >     │   │   ├── frequency
> > >     │   │   └── power
> > >     │   ├── cs:775000
> > >     │   │   ├── cost
> > >     │   │   ├── frequency
> > >     │   │   └── power
> > >     │   └── cs:850000
> > >     │       ├── cost
> > >     │       ├── frequency
> > >     │       └── power
> > >     └── pd1
> > >         ├── cpus
> > >         ├── cs:1100000
> > >         │   ├── cost
> > >         │   ├── frequency
> > >         │   └── power
> > >         ├── cs:450000
> > >         │   ├── cost
> > >         │   ├── frequency
> > >         │   └── power
> > >         ├── cs:625000
> > >         │   ├── cost
> > >         │   ├── frequency
> > >         │   └── power
> > >         ├── cs:800000
> > >         │   ├── cost
> > >         │   ├── frequency
> > >         │   └── power
> > >         └── cs:950000
> > >             ├── cost
> > >             ├── frequency
> > >             └── power
> > > 
> > > Signed-off-by: Quentin Perret <quentin.perret@arm.com>
> > > 
> > > ---
> > > 
> > > V2: removed check on return value of debugfs_create_* (Greg KH)
> > > ---
> > >  kernel/power/energy_model.c | 57 +++++++++++++++++++++++++++++++++++++
> > >  1 file changed, 57 insertions(+)
> > 
> > Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Applied, thanks!

      reply	other threads:[~2019-01-24 10:46 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-22 16:42 [PATCH v2] PM / EM: Expose the Energy Model in debugfs Quentin Perret
2019-01-22 18:41 ` Greg KH
2019-01-23  9:28   ` Quentin Perret
2019-01-24 10:45     ` Rafael J. Wysocki [this message]

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=3845915.x0TneKyrcv@aspire.rjw.lan \
    --to=rjw@rjwysocki.net \
    --cc=dietmar.eggemann@arm.com \
    --cc=gregkh@linuxfoundation.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-pm@vger.kernel.org \
    --cc=mingo@redhat.com \
    --cc=peterz@infradead.org \
    --cc=quentin.perret@arm.com \
    --cc=rafael@kernel.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).