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SubjectRe: [PATCH v2] cpupower: Provide online and offline CPU information
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On 9/29/20 7:11 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 patch adds helper functions to find both online and offline CPUs and
> print them out accordingly.
>
> 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@in.ibm.com>
> Signed-off-by: Brahadambal Srinivasan <latha@linux.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(-)
>

Please elaborate the changes made since v1.

I am seeing compile warnings. Please fix and send v3.

utils/cpufreq-set.c: In function ‘cmd_freq_set’:
utils/cpufreq-set.c:332:2: warning: implicit declaration of function
‘print_offline_cpus’ [-Wimplicit-function-declaration]
332 | print_offline_cpus();
| ^~~~~~~~~~~~~~~~~~
CC utils/cpupower-set.o
CC utils/cpupower-info.o
CC utils/cpuidle-info.o
CC utils/cpuidle-set.o
utils/cpuidle-set.c: In function ‘cmd_idle_set’:
utils/cpuidle-set.c:187:2: warning: implicit declaration of function
‘print_offline_cpus’ [-Wimplicit-function-declaration]
187 | print_offline_cpus();

thanks,
-- Shuah

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