linux-kernel - Re: [PATCH v11 0/8] PM / Domains: Support hierarchical CPU arrangement (PSCI/ARM)

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Message-ID: <CAJZ5v0jiUWsYeQm8xoGf=WpM+yWdnPnkGK0+amPb=3PUE+APfg@mail.gmail.com>
Date:   Tue, 26 Feb 2019 18:50:13 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Linux PM <linux-pm@...r.kernel.org>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sudeep Holla <sudeep.holla@....com>,
        Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
        Mark Rutland <mark.rutland@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        "Raju P . L . S . S . S . N" <rplsssn@...eaurora.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Tony Lindgren <tony@...mide.com>,
        Kevin Hilman <khilman@...nel.org>,
        Lina Iyer <ilina@...eaurora.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v11 0/8] PM / Domains: Support hierarchical CPU
 arrangement (PSCI/ARM)

On Tue, Feb 26, 2019 at 3:55 PM Ulf Hansson <ulf.hansson@...aro.org> wrote:
>
> Changes in v11:
>  - This version contains only the infrastructure changes that is needed for
> deployment. The PSCI/ARM changes have also been updated and tested, but I will
> post them separately. Still, to provide completeness, I have published a branch
> containing everything to a git tree [1], feel free to have a look and test.
>  - The v10 series contained a patch, "timer: Export next wakeup time of a CPU",
> which has been replaced by a couple of new patches, whom reworks the existing
> tick_nohz_get_sleep_length() function, to provide the next timer expiration
> instead of the duration.
>  - More changelogs are available per patch.

NAK for patches [4-6/8].

The code as is specifically avoids calling ktime_get() from the
governors as that can be quite expensive, so these patches potentially
make things worse.