diff options
Diffstat (limited to 'drivers/cpufreq')
| -rw-r--r-- | drivers/cpufreq/intel_pstate.c | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 8bfebaeda2dd..efc581392bd1 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -113,6 +113,7 @@ struct cpudata { u64 prev_aperf; u64 prev_mperf; u64 prev_tsc; + u64 prev_cummulative_iowait; struct sample sample; }; @@ -933,22 +934,39 @@ static inline void intel_pstate_set_sample_time(struct cpudata *cpu) static inline int32_t get_target_pstate_use_cpu_load(struct cpudata *cpu) { struct sample *sample = &cpu->sample; + u64 cummulative_iowait, delta_iowait_us; + u64 delta_iowait_mperf; + u64 mperf, now; int32_t cpu_load; + cummulative_iowait = get_cpu_iowait_time_us(cpu->cpu, &now); + + /* + * Convert iowait time into number of IO cycles spent at max_freq. + * IO is considered as busy only for the cpu_load algorithm. For + * performance this is not needed since we always try to reach the + * maximum P-State, so we are already boosting the IOs. + */ + delta_iowait_us = cummulative_iowait - cpu->prev_cummulative_iowait; + delta_iowait_mperf = div64_u64(delta_iowait_us * cpu->pstate.scaling * + cpu->pstate.max_pstate, MSEC_PER_SEC); + + mperf = cpu->sample.mperf + delta_iowait_mperf; + cpu->prev_cummulative_iowait = cummulative_iowait; + + /* * The load can be estimated as the ratio of the mperf counter * running at a constant frequency during active periods * (C0) and the time stamp counter running at the same frequency * also during C-states. */ - cpu_load = div64_u64(int_tofp(100) * sample->mperf, sample->tsc); - + cpu_load = div64_u64(int_tofp(100) * mperf, sample->tsc); cpu->sample.busy_scaled = cpu_load; return cpu->pstate.current_pstate - pid_calc(&cpu->pid, cpu_load); } - static inline int32_t get_target_pstate_use_performance(struct cpudata *cpu) { int32_t core_busy, max_pstate, current_pstate, sample_ratio; |