linux-kernel - Re: [PATCH V4] powercap/drivers/idle_injection: Add an idle injection framework

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Date:   Tue, 5 Jun 2018 08:53:36 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     rjw@...ysocki.net, edubezval@...il.com, kevin.wangtao@...aro.org,
        leo.yan@...aro.org, vincent.guittot@...aro.org,
        linux-kernel@...r.kernel.org, javi.merino@...nel.org,
        rui.zhang@...el.com, linux-pm@...r.kernel.org,
        daniel.thompson@...aro.org
Subject: Re: [PATCH V4] powercap/drivers/idle_injection: Add an idle injection
 framework

On 05/06/2018 07:53, Viresh Kumar wrote:
> On 05-06-18, 07:48, Daniel Lezcano wrote:
>> As soon as we reach complete(), no timer can be set because of the
>> condition before.
> 
> Why not ? We aren't using any locks here and it is possible that run_duration_ms
> is set to 0 from idle_injection_stop() only after the first thread has restarted
> the hrtimer. Isn't it ?

If he restarted the timer, complete() won't be called and
idle_injection_stop() will wait until the idle cycle injection is finished.


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