linux-kernel - Re: [RFC v2 2/2] selftest/cpuidle: Add support for cpuidle latency measurement

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Date:   Thu, 1 Apr 2021 16:27:04 -0700
From:   Doug Smythies <dsmythies@...us.net>
To:     Pratik Rajesh Sampat <psampat@...ux.ibm.com>
Cc:     rjw@...ysocki.net, Daniel Lezcano <daniel.lezcano@...aro.org>,
        shuah@...nel.org, ego@...ux.vnet.ibm.com, svaidy@...ux.ibm.com,
        Linux PM list <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-kselftest@...r.kernel.org, pratik.r.sampat@...il.com,
        dsmythies <dsmythies@...us.net>
Subject: Re: [RFC v2 2/2] selftest/cpuidle: Add support for cpuidle latency measurement

Hi Pratik,

On Thu, Apr 1, 2021 at 4:45 AM Pratik Rajesh Sampat
<psampat@...ux.ibm.com> wrote:
>
...

> To run this test specifically:
> $ make -C tools/testing/selftests TARGETS="cpuidle" run_tests

I have not become any smarter than I was with version 1,
and still assumed that the "$" meant regular user.
Please put it as "#" or separate the two steps, compile and run.

>
> There are a few optinal arguments too that the script can take

optional

Suggest to also specifically mention how to run without re-compile,

# ./cpuidle.sh -v

Note also that the test still leaves all idle states disabled when done.

>         [-h <help>]
>         [-i <run timer tests>]
>         [-m <location of the module>]
>         [-o <location of the output>]
>         [-v <verbose> (run on all cpus)]
> Default Output location in: tools/testing/selftest/cpuidle/cpuidle.log

...

> +cpu_is_online()
> +{
> +       cpu=$1
> +       if [ ! -f "/sys/devices/system/cpu/cpu$cpu/online" ]; then
> +               echo 0

incorrect. should be:

> +               echo 1

... Doug