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Date: Tue, 8 Aug 2017 16:01:26 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Ingo Molnar <mingo@kernel.org>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        "rjw@rjwysocki.net" <rjw@rjwysocki.net>,
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        Dietmar Eggemann <dietmar.eggemann@arm.com>,
        Morten Rasmussen <Morten.Rasmussen@arm.com>,
        viresh kumar <viresh.kumar@linaro.org>
Subject: Re: [RESEND PATCH v2 1/2] sched/rt: add utilization tracking
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On Tue, Aug 08, 2017 at 03:56:26PM +0200, Vincent Guittot wrote:
> 
> I don't think that IRQ tracking patch is working.
> update_irq_load_avg(rq->clock, cpu_of(rq), rq, 1); is called in
> update_rq_clock_task() which is never called in irq context. In order
> to use PELT for tracking irq and paravirt, we should call
> update_irq_load_avg() for every context switch between irq/paravirt
> and task which will probably be too heavy. Nevertheless, we can
> 

Right, realized the same much later yesterday...