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cpufreq: schedutil: Update next_freq when cpufreq_limits change
When cpufreq's policy is 'single', there is a scenario that will cause sg_policy's next_freq to be unable to update. When the CPU's util is always max, the cpufreq will be max, and then if we change the policy's scaling_max_freq to be a lower freq, indeed, the sg_policy's next_freq need change to be the lower freq, however, because the cpu_is_busy, the next_freq would keep the max_freq. For example: The cpu7 is a single CPU: unisoc:/sys/devices/system/cpu/cpufreq/policy7 # while true;do done& [1] 4737 unisoc:/sys/devices/system/cpu/cpufreq/policy7 # taskset -p 80 4737 pid 4737's current affinity mask: ff pid 4737's new affinity mask: 80 unisoc:/sys/devices/system/cpu/cpufreq/policy7 # cat scaling_max_freq2301000
unisoc:/sys/devices/system/cpu/cpufreq/policy7 # cat scaling_cur_freq2301000
unisoc:/sys/devices/system/cpu/cpufreq/policy7 # echo 2171000 > scaling_max_freq unisoc:/sys/devices/system/cpu/cpufreq/policy7 # cat scaling_max_freq 2171000 At this time, the sg_policy's next_freq would stay at2301000
, which is wrong. To fix this, add a check for the ->need_freq_update flag. [ mingo: Clarified the changelog. ] Co-developed-by: Guohua Yan <guohua.yan@unisoc.com> Signed-off-by: Xuewen Yan <xuewen.yan@unisoc.com> Signed-off-by: Guohua Yan <guohua.yan@unisoc.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Acked-by: "Rafael J. Wysocki" <rafael@kernel.org> Link: https://lore.kernel.org/r/20230719130527.8074-1-xuewen.yan@unisoc.com
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@ -350,7 +350,8 @@ static void sugov_update_single_freq(struct update_util_data *hook, u64 time,
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* Except when the rq is capped by uclamp_max.
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*/
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if (!uclamp_rq_is_capped(cpu_rq(sg_cpu->cpu)) &&
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sugov_cpu_is_busy(sg_cpu) && next_f < sg_policy->next_freq) {
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sugov_cpu_is_busy(sg_cpu) && next_f < sg_policy->next_freq &&
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!sg_policy->need_freq_update) {
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next_f = sg_policy->next_freq;
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/* Restore cached freq as next_freq has changed */
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