linux-kernel - RE: [RFT][PATCH 1/3] PM: QoS: Introduce frequency QoS

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Message-ID: <000a01d59d19$75793a80$606baf80$@net>
Date:   Sat, 16 Nov 2019 23:34:31 -0800
From:   "Doug Smythies" <dsmythies@...us.net>
To:     "'Rafael J. Wysocki'" <rjw@...ysocki.net>,
        "'Linux PM'" <linux-pm@...r.kernel.org>
Cc:     "'Linux ACPI'" <linux-acpi@...r.kernel.org>,
        "'LKML'" <linux-kernel@...r.kernel.org>,
        "'Viresh Kumar'" <viresh.kumar@...aro.org>,
        "'Sudeep Holla'" <sudeep.holla@....com>,
        "'Dmitry Osipenko'" <digetx@...il.com>
Subject: RE: [RFT][PATCH 1/3] PM: QoS: Introduce frequency QoS

On 2019.10.16 03:41 Rafael J. Wysocki wrote:

... deleted ...

Hi Rafael,

Not sure, but I think it is this one that
causes complaining when I try to set the
intel_pstate driver to passive mode.
I started from active mode, powersave governor,
no HWP.

Kernel: 5.4-rc7

I did not go back and try previous 5.4 RCs.
I did try kernel 5.3-rc8, because I already had
it installed, and it worked fine.

I use a script (for years), run as sudo:

doug@s15:~/temp$ cat set_cpu_passive
#! /bin/bash
cat /sys/devices/system/cpu/intel_pstate/status
echo passive > /sys/devices/system/cpu/intel_pstate/status
cat /sys/devices/system/cpu/intel_pstate/status

And I get this (very small excerpt):

freq_qos_add_request() called for active request
WARNING: CPU: 1 PID: 2758 at kernel/power/qos.c:763 freq_qos_add_request+0x4c/0xa0
CPU: 1 PID: 2758 Comm: set_cpu_passive Not tainted 5.4.0-rc7-stock #727
Failed to add freq constraint for CPU0 (-22)

freq_qos_add_request() called for active request
WARNING: CPU: 1 PID: 2758 at kernel/power/qos.c:763 freq_qos_add_request+0x4c/0xa0
CPU: 1 PID: 2758 Comm: set_cpu_passive Tainted: G        W         5.4.0-rc7-stock #727
Failed to add freq constraint for CPU1 (-22)

...

I'll attach the whole thing, but it will likely get removed
from the general list e-mails.

... Doug

View attachment "rjw.txt" of type "text/plain" (93841 bytes)