Messages in this thread Patch in this message | | | From | Douglas RAILLARD <> | Subject | [RFC PATCH v4 6/6] sched/cpufreq: Add schedutil_em_tp tracepoint | Date | Wed, 22 Jan 2020 17:35:38 +0000 |
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Introduce a new tracepoint reporting the effect of using the Energy Model inside get_next_freq() in schedutil.
Signed-off-by: Douglas RAILLARD <douglas.raillard@arm.com> --- include/trace/events/power.h | 9 +++++++++ kernel/sched/cpufreq_schedutil.c | 20 ++++++++++++++------ 2 files changed, 23 insertions(+), 6 deletions(-)
diff --git a/include/trace/events/power.h b/include/trace/events/power.h index 7457e238e1b7..a3df4e915f5b 100644 --- a/include/trace/events/power.h +++ b/include/trace/events/power.h @@ -525,6 +525,15 @@ DEFINE_EVENT(dev_pm_qos_request, dev_pm_qos_remove_request, TP_ARGS(name, type, new_value) ); + +DECLARE_TRACE(schedutil_em_tp, + TP_PROTO(unsigned int cpu, unsigned long util, + unsigned int cost_margin, unsigned int policy_cost_margin, + unsigned int base_freq, unsigned int boosted_freq), + TP_ARGS(cpu, util, cost_margin, policy_cost_margin, base_freq, + boosted_freq) +); + #endif /* _TRACE_POWER_H */ /* This part must be outside protection */ diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c index 9a7617ea7bf4..8909c752c06f 100644 --- a/kernel/sched/cpufreq_schedutil.c +++ b/kernel/sched/cpufreq_schedutil.c @@ -14,6 +14,8 @@ #include <linux/sched/cpufreq.h> #include <trace/events/power.h> +EXPORT_TRACEPOINT_SYMBOL_GPL(schedutil_em_tp); + #define IOWAIT_BOOST_MIN (SCHED_CAPACITY_SCALE / 8) struct sugov_tunables { @@ -225,7 +227,7 @@ static unsigned long sugov_cpu_ramp_boost_update(struct sugov_cpu *sg_cpu) /** * get_next_freq - Compute a new frequency for a given cpufreq policy. - * @sg_policy: schedutil policy object to compute the new frequency for. + * @sg_cpu: schedutil CPU object to compute the new frequency for. * @util: Current CPU utilization. * @max: CPU capacity. * @boost: Extra power that can be spent on top of the minimum amount of power @@ -248,22 +250,28 @@ static unsigned long sugov_cpu_ramp_boost_update(struct sugov_cpu *sg_cpu) * next_freq (as calculated above) is returned, subject to policy min/max and * cpufreq driver limitations. */ -static unsigned int get_next_freq(struct sugov_policy *sg_policy, +static unsigned int get_next_freq(struct sugov_cpu *sg_cpu, unsigned long util, unsigned long max, unsigned long boost) { + struct sugov_policy *sg_policy = sg_cpu->sg_policy; struct cpufreq_policy *policy = sg_policy->policy; unsigned int freq = arch_scale_freq_invariant() ? policy->cpuinfo.max_freq : policy->cur; struct em_perf_domain *pd = sugov_policy_get_pd(sg_policy); + unsigned int base_freq; - freq = map_util_freq(util, freq, max); + base_freq = map_util_freq(util, freq, max); /* * Try to get a higher frequency if one is available, given the extra * power we are ready to spend. */ - freq = em_pd_get_higher_freq(pd, freq, boost); + freq = em_pd_get_higher_freq(pd, base_freq, boost); + + trace_schedutil_em_tp(sg_cpu->cpu, util, + sugov_cpu_ramp_boost(sg_cpu), boost, + base_freq, freq); if (freq == sg_policy->cached_raw_freq && !sg_policy->need_freq_update) return sg_policy->next_freq; @@ -562,7 +570,7 @@ static void sugov_update_single(struct update_util_data *hook, u64 time, ramp_boost = sugov_cpu_ramp_boost_update(sg_cpu); max = sg_cpu->max; util = sugov_iowait_apply(sg_cpu, time, util, max); - next_f = get_next_freq(sg_policy, util, max, ramp_boost); + next_f = get_next_freq(sg_cpu, util, max, ramp_boost); /* * Do not reduce the frequency if the CPU has not been idle * recently, as the reduction is likely to be premature then. @@ -616,7 +624,7 @@ static unsigned int sugov_next_freq_shared(struct sugov_cpu *sg_cpu, u64 time) } } - return get_next_freq(sg_policy, util, max, ramp_boost); + return get_next_freq(sg_cpu, util, max, ramp_boost); } static void -- 2.24.1
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