linux-kernel - [PATCH v3 0/4] cpufreq: intel_pstate: Handle _PPC updates on global turbo disable/enable

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Date:   Tue, 26 Mar 2019 12:12:35 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Linux PM <linux-pm@...r.kernel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Chen Yu <yu.c.chen@...el.com>,
        Gabriele Mazzotta <gabriele.mzt@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Quentin Perret <quentin.perret@....com>
Subject: [PATCH v3 0/4] cpufreq: intel_pstate: Handle _PPC updates on global turbo disable/enable

Hi All,

This is a new version of the following with one patch added:

> This is a follow-up to the RFT patch set posted previously:
> https://lore.kernel.org/lkml/9956076.F4luUDm1Dq@aspire.rjw.lan/
> 
> Patch [1/3] causes intel_pstate to update all policies if it gets a _PPC
> change notification and sees a global turbo disable/enable change.
> 
> Patch [2/3] adds cpufreq_cpu_acquire() and cpufreq_cpu_release() to reduce
> code duplication after the next patch a bit (and Srinivas wanted the rwsem
> manipulation to not be done directly by the driver).
> 
> Patch [3/3] makes intel_pstate update cpuinfo.max_freq for all policies in
> those cases.
> 
> I've atted Tested-by tags to patches [1/3] and [3/3], because there are only
> cosmetic differences between them and what has been tested..

The new patch goes (as the new [3/4]) before the old [3/3] (which becomes the
new [4/4] obviously) and it modifies the schedutil governor to prevent it
from caching values that depend on cpuinfo.max_freq.

The other patches are the same as before.

Thanks,
Rafael