linux-kernel - Re: [PATCH v1] tools/thermal: Introduce tmon, a tool for thermal subsystem

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Date:	Tue, 15 Oct 2013 11:14:01 +0200
From:	Borislav Petkov <bp@...e.de>
To:	Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc:	Zhang Rui <rui.zhang@...el.com>,
	Linux PM <linux-pm@...r.kernel.org>,
	Eduardo Valentin <eduardo.valentin@...com>,
	LKML <linux-kernel@...r.kernel.org>, acme@...hat.com,
	dhowells@...hat.com, bp@...e.de, gthelen@...gle.com,
	Rafael Wysocki <rafael.j.wysocki@...el.com>
Subject: Re: [PATCH v1] tools/thermal: Introduce tmon, a tool for thermal
 subsystem

On Mon, Oct 14, 2013 at 04:02:27PM -0700, Jacob Pan wrote:
> Increasingly, Linux is running on thermally constrained devices. The simple
> thermal relationship between processor and fan has become past for modern
> computers.
> 
> As hardware vendors cope with the thermal constraints on their products,
> more sensors are added, new cooling capabilities are introduced. The
> complexity of the thermal relationship can grow exponentially among cooling
> devices, zones, sensors, and trip points. They can also change dynamically.
> 
> To expose such relationship to the userspace, Linux generic thermal layer
> introduced sysfs entry at /sys/class/thermal with a matrix of symbolic
> links, trip point bindings, and device instances. To traverse such
> matrix by hand is not a trivial task. Testing is also difficult in that
> thermal conditions are often exception cases that hard to reach in
> normal operations.
> 
> TMON is conceived as a tool to help visualize, tune, and test the
> complex thermal subsystem.
> 
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> ---
>  tools/Makefile              |   15 +-
>  tools/thermal/tmon/Makefile |   47 ++++
>  tools/thermal/tmon/README   |   50 ++++
>  tools/thermal/tmon/pid.c    |  131 +++++++++
>  tools/thermal/tmon/sysfs.c  |  596 ++++++++++++++++++++++++++++++++++++++++
>  tools/thermal/tmon/tmon.8   |  142 ++++++++++
>  tools/thermal/tmon/tmon.c   |  352 ++++++++++++++++++++++++
>  tools/thermal/tmon/tmon.h   |  204 ++++++++++++++
>  tools/thermal/tmon/tui.c    |  638 +++++++++++++++++++++++++++++++++++++++++++
>  9 files changed, 2173 insertions(+), 2 deletions(-)
>  create mode 100644 tools/thermal/tmon/Makefile
>  create mode 100644 tools/thermal/tmon/README
>  create mode 100644 tools/thermal/tmon/pid.c
>  create mode 100644 tools/thermal/tmon/sysfs.c
>  create mode 100644 tools/thermal/tmon/tmon.8
>  create mode 100644 tools/thermal/tmon/tmon.c
>  create mode 100644 tools/thermal/tmon/tmon.h
>  create mode 100644 tools/thermal/tmon/tui.c

Just a couple of notes/questions:

* Why does this have to be in the kernel src repo? I mean, it only
needs stable sysfs interface but other than that, it can very well be a
separate project on github or so. Or am I missing something?

* So I tried it and I can control the brightness and the target CPU
temperature, cool! :) The question is: can I cook my box with it or
there are protections like filtering values which might be detrimental
to the system? After all, I'm running it as root.

* Also, please run this through checkpatch first:

  total: 1 errors, 0 warnings, 91 checks, 2202 lines checked

  Also, the manpage should be checked for typos and excessive spaces.

Thanks.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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