linux-kernel - Re: [PATCH V6] powercap/drivers/idle_injection: Add an idle injection framework

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Message-ID: <20180613091047.mfhtgrdypx2qvndp@vireshk-i7>
Date:   Wed, 13 Jun 2018 14:40:47 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     Peter Zijlstra <peterz@...radead.org>, rjw@...ysocki.net,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        Eduardo Valentin <edubezval@...il.com>,
        Javi Merino <javi.merino@...nel.org>,
        Leo Yan <leo.yan@...aro.org>,
        Kevin Wangtao <kevin.wangtao@...aro.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Rui Zhang <rui.zhang@...el.com>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Andrea Parri <andrea.parri@...rulasolutions.com>
Subject: Re: [PATCH V6] powercap/drivers/idle_injection: Add an idle
 injection framework

On 13-06-18, 11:03, Daniel Lezcano wrote:
> nr_threads(smpboot) <> nr_threads(idleinject)
> 
> If we are facing races issues, it is because we are trying to avoid
> using locks in the code path. With lock and proper refcounting that
> should be solved, AFAICT there are similar races with inodes.

I am not sure if locking can make things better here. We aren't using them as we
don't really need them AFAIU :)

-- 
viresh