linux-kernel - Re: [PATCH 01/10] sched/deadline: track the active utilization

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Date:   Thu, 8 Jun 2017 10:31:25 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     luca abeni <luca.abeni@...tannapisa.it>
Cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Juri Lelli <juri.lelli@....com>,
        Claudio Scordino <claudio@...dence.eu.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Tommaso Cucinotta <tommaso.cucinotta@...up.it>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Joel Fernandes <joelaf@...gle.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Luca Abeni <luca.abeni@...tn.it>
Subject: Re: [PATCH 01/10] sched/deadline: track the active utilization


* luca abeni <luca.abeni@...tannapisa.it> wrote:

> From: Luca Abeni <luca.abeni@...tn.it>
> 
> Active utilization is defined as the total utilization of active
> (TASK_RUNNING) tasks queued on a runqueue. Hence, it is increased
> when a task wakes up and is decreased when a task blocks.
> 
> When a task is migrated from CPUi to CPUj, immediately subtract the
> task's utilization from CPUi and add it to CPUj. This mechanism is
> implemented by modifying the pull and push functions.
> Note: this is not fully correct from the theoretical point of view
> (the utilization should be removed from CPUi only at the 0 lag
> time), a more theoretically sound solution is presented in the
> next patches.
> 
> Signed-off-by: Juri Lelli <juri.lelli@....com>
> Signed-off-by: Luca Abeni <luca.abeni@...tn.it>
> Tested-by: Daniel Bristot de Oliveira <bristot@...hat.com>

So that SOB chain is not valid - either Juri needs to be the From: author, or it 
should be an Acked-by (or Reviewed-by).

For now I've converted this to:

> Signed-off-by: Luca Abeni <luca.abeni@...tn.it>
> Acked-by: Juri Lelli <juri.lelli@....com>

Please holler if you'd like something else.

Thanks,

	Ingo