Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Wed, 24 Apr 2019 18:34:24 +0200
From:   Peter Zijlstra <peterz@infradead.org>
To:     Ingo Molnar <mingo@kernel.org>
Cc:     Thara Gopinath <thara.gopinath@linaro.org>, mingo@redhat.com,
        rui.zhang@intel.com, linux-kernel@vger.kernel.org,
        amit.kachhap@gmail.com, viresh.kumar@linaro.org,
        javi.merino@kernel.org, edubezval@gmail.com,
        daniel.lezcano@linaro.org, vincent.guittot@linaro.org,
        nicolas.dechesne@linaro.org, bjorn.andersson@linaro.org,
        dietmar.eggemann@arm.com, Quentin Perret <quentin.perret@arm.com>,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>
Subject: Re: [PATCH V2 0/3] Introduce Thermal Pressure
Message-ID: <20190424163424.GG4038@hirez.programming.kicks-ass.net>
References: <1555443521-579-1-git-send-email-thara.gopinath@linaro.org>
 <20190417053626.GA47282@gmail.com>
 <5CB75FD9.3070207@linaro.org>
 <20190417182932.GB5140@gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20190417182932.GB5140@gmail.com>
User-Agent: Mutt/1.10.1 (2018-07-13)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Wed, Apr 17, 2019 at 08:29:32PM +0200, Ingo Molnar wrote:
> Assuming PeterZ & Rafael & Quentin doesn't hate the whole thermal load 
> tracking approach. 

I seem to remember competing proposals, and have forgotten everything
about them; the cover letter also didn't have references to them or
mention them in any way.

As to the averaging and period, I personally prefer a PELT signal with
the windows lined up, if that really is too short a window, then a PELT
like signal with a natural multiple of the PELT period would make sense,
such that the windows still line up nicely.

Mixing different averaging methods and non-aligned windows just makes me
uncomfortable.