On Fri, Sep 22, 2017 at 04:32:18PM +0530, Abhishek Goel wrote:
> cpuidle_monitor used to assume that cpu0 is always online.
On what platform is this assumption not valid and what is the problem
caused due to this.
> Now the
> cpuidle_monitor function searches for the first online cpu and use
> it, instead of always using cpu0 which may not be online.
Mention that this is the fix performed by this patch.
>
> Signed-off-by: Abhishek Goel <hunt...@linux.vnet.ibm.com>
> ---
> tools/power/cpupower/utils/idle_monitor/cpuidle_sysfs.c | 14 +++++++++++---
> 1 file changed, 11 insertions(+), 3 deletions(-)
>
> diff --git a/tools/power/cpupower/utils/idle_monitor/cpuidle_sysfs.c
> b/tools/power/cpupower/utils/idle_monitor/cpuidle_sysfs.c
> index 1b5da00..adacf99 100644
> --- a/tools/power/cpupower/utils/idle_monitor/cpuidle_sysfs.c
> +++ b/tools/power/cpupower/utils/idle_monitor/cpuidle_sysfs.c
> @@ -130,15 +130,23 @@ static struct cpuidle_monitor *cpuidle_register(void)
> {
> int num;
> char *tmp;
> + int first_online_cpu;
> +
> + for (num = 0; num < cpu_count; num++) {
> + if (cpupower_is_cpu_online(num))
> + break;
> + };
Don't we have an API that gives the list by parsing
"/sys/devices/system/cpu/online" ?
> + first_online_cpu = num;
>
> /* Assume idle state count is the same for all CPUs */
> - cpuidle_sysfs_monitor.hw_states_num = cpuidle_state_count(0);
> + cpuidle_sysfs_monitor.hw_states_num =
> + cpuidle_state_count(first_online_cpu);
>
> if (cpuidle_sysfs_monitor.hw_states_num <= 0)
> return NULL;
>
> for (num = 0; num < cpuidle_sysfs_monitor.hw_states_num; num++) {
> - tmp = cpuidle_state_name(0, num);
> + tmp = cpuidle_state_name(first_online_cpu, num);
> if (tmp == NULL)
> continue;
>
> @@ -146,7 +154,7 @@ static struct cpuidle_monitor *cpuidle_register(void)
> strncpy(cpuidle_cstates[num].name, tmp, CSTATE_NAME_LEN - 1);
> free(tmp);
>
> - tmp = cpuidle_state_desc(0, num);
> + tmp = cpuidle_state_desc(first_online_cpu, num);
> if (tmp == NULL)
> continue;
> strncpy(cpuidle_cstates[num].desc, tmp,
>CSTATE_DESC_LEN - 1);
Looks ok to me otherwise.
> --
> 2.9.3
>
