From: Douglas RAILLARD douglas.raillard@arm.com
[ Upstream commit 77c84dd1881d0f0176cb678d770bfbda26c54390 ]
Fast switching path only emits an event for the CPU of interest, whereas the regular path emits an event for all the CPUs that had their frequency changed, i.e. all the CPUs sharing the same policy.
With the current behavior, looking at cpu_frequency event for a given CPU that is using the fast switching path will not give the correct frequency signal.
Signed-off-by: Douglas RAILLARD douglas.raillard@arm.com Acked-by: Peter Zijlstra (Intel) peterz@infradead.org Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- kernel/sched/cpufreq_schedutil.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c index 867b4bb6d4beb..b03ca2f73713d 100644 --- a/kernel/sched/cpufreq_schedutil.c +++ b/kernel/sched/cpufreq_schedutil.c @@ -117,6 +117,7 @@ static void sugov_fast_switch(struct sugov_policy *sg_policy, u64 time, unsigned int next_freq) { struct cpufreq_policy *policy = sg_policy->policy; + int cpu;
if (!sugov_update_next_freq(sg_policy, time, next_freq)) return; @@ -126,7 +127,11 @@ static void sugov_fast_switch(struct sugov_policy *sg_policy, u64 time, return;
policy->cur = next_freq; - trace_cpu_frequency(next_freq, smp_processor_id()); + + if (trace_cpu_frequency_enabled()) { + for_each_cpu(cpu, policy->cpus) + trace_cpu_frequency(next_freq, cpu); + } }
static void sugov_deferred_update(struct sugov_policy *sg_policy, u64 time,