From: Viresh Kumar <viresh.kumar@linaro.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
Linux PM <linux-pm@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Patrick Bellasi <patrick.bellasi@arm.com>,
Vincent Guittot <vincent.guittot@linaro.org>
Subject: Re: [PATCH] cpufreq: schedutil: Always trace frequency if it does not change
Date: Wed, 22 Mar 2017 15:26:15 +0530 [thread overview]
Message-ID: <20170322095615.GB12094@vireshk-i7> (raw)
In-Reply-To: <20170322092951.GX5680@worktop>
On 22-03-17, 10:29, Peter Zijlstra wrote:
> On Wed, Mar 22, 2017 at 01:56:53AM +0100, Rafael J. Wysocki wrote:
> > However, the same problem may occur for a cpufreq driver that doesn't
> > support fast frequency switching and implements the ->target callback
> > (that is, it doesn't use frequency tables), but trace_cpu_frequency()
> > is not called if frequency updates are skipped in that case.
>
> I'm having trouble parsing that; am I right in understanding this is the
> exact same scenario where only superfluous changes are omitted?
Yes. Just for a different driver type.
--
viresh
next prev parent reply other threads:[~2017-03-22 9:56 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-22 0:56 [PATCH] cpufreq: schedutil: Always trace frequency if it does not change Rafael J. Wysocki
2017-03-22 4:16 ` Viresh Kumar
2017-03-22 9:29 ` Peter Zijlstra
2017-03-22 9:56 ` Viresh Kumar [this message]
2017-03-22 12:52 ` Rafael J. Wysocki
2017-03-22 14:05 ` Rafael J. Wysocki
2017-03-22 14:21 ` Peter Zijlstra
2017-03-22 17:13 ` Rafael J. Wysocki
2017-03-22 17:32 ` [PATCH v2] cpufreq: schedutil: Trace frequency only if it has changed Rafael J. Wysocki
2017-03-23 4:32 ` Viresh Kumar
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