linux-kernel - Re: [PATCH] cpuidle: add 'failed' statistic

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Message-ID: <CAJvTdKmUKS82YxkQio2_bPqXv7kNnyFpHcuvfZ=ExBZrkEg1eA@mail.gmail.com>
Date:	Mon, 10 Mar 2014 22:00:22 -0400
From:	Len Brown <lenb@...nel.org>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linux PM list <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cpuidle: add 'failed' statistic

Exactly what use-case do you have in mind for this attribute?

"failed" is a strong word.
Some validation guy is going to send me e-mail when it is non-zero...
I don't like that use-case.

But even if re-named, I don't see see how it will be useful.
When I want to see how C-state predictions are doing, I use ftrace,
which can show me the actual expected and actual times, not just a count
of how man times predicted was < actual.
I would rather see some good tracepoints go upstream.

thanks,
Len Brown, Intel Open Source Technology Center
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