linux-kernel - Re: [PATCH v3] cpupower: Provide online and offline CPU information

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Message-ID: <d6459dc7-1ee6-a5ef-bae1-c09afbecb0b9@linuxfoundation.org>
Date:   Tue, 20 Oct 2020 18:30:57 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Brahadambal Srinivasan <latha@...ux.vnet.ibm.com>,
        shuah@...nel.org, trenn@...e.com
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Pavithra R . Prakash" <pavrampu@...ibm.com>,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH v3] cpupower: Provide online and offline CPU information

On 10/16/20 2:59 AM, Brahadambal Srinivasan wrote:
> When a user tries to modify cpuidle or cpufreq properties on offline
> CPUs, the tool returns success (exit status 0) but also does not provide
> any warning message regarding offline cpus that may have been specified
> but left unchanged. In case of all or a few CPUs being offline, it can be
> difficult to keep track of which CPUs didn't get the new frequency or idle
> state set. Silent failures are difficult to keep track of when there are a
> huge number of CPUs on which the action is performed.
> 

This fllowing text shouldn't be part of the change log. This type of
version to version change text is added between the --- and start of
diff.

> In v1 of this patch, I had sent tried to address this with repetitive code
> in both cpufreq-set and cpuidle-set. V2 incorporated the review comments
> and added helper functions to find both online and offline CPUs and print
> them out accordingly. Correcting compile issues in v3.
> 
> We use these helper functions in cpuidle-set and cpufreq-set to print an
> additional message if the user attempts to modify offline cpus.
> 
> Reported-by: Pavithra R. Prakash <pavrampu@...ibm.com>
> Signed-off-by: Brahadambal Srinivasan <latha@...ux.vnet.ibm.com>
> ---
>   tools/power/cpupower/utils/cpufreq-set.c     |  3 +
>   tools/power/cpupower/utils/cpuidle-set.c     |  4 ++
>   tools/power/cpupower/utils/cpupower.c        |  8 +++
>   tools/power/cpupower/utils/helpers/helpers.h | 12 ++++
>   tools/power/cpupower/utils/helpers/misc.c    | 66 +++++++++++++++++++-
>   5 files changed, 92 insertions(+), 1 deletion(-)
> 

Add revision changes here.

> diff --git a/tools/power/cpupower/utils/cpufreq-set.c b/tools/power/cpupower/utils/cpufreq-set.c
> index 6ed82fba5aaa..f25cdfa05c5f 100644
> --- a/tools/power/cpupower/utils/cpufreq-set.c
> +++ b/tools/power/cpupower/utils/cpufreq-set.c

thanks,
-- Shuah