diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/cpufreq/intel_pstate.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 3949e3861f55..5b2b6b6d1ff4 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -223,6 +223,8 @@ struct global_params { * operation * @hwp_req_cached: Cached value of the last HWP Request MSR * @hwp_cap_cached: Cached value of the last HWP Capabilities MSR + * @last_io_update: Last time when IO wake flag was set + * @sched_flags: Store scheduler flags for possible cross CPU update * @hwp_boost_min: Last HWP boosted min performance * * This structure stores per CPU instance data for all CPUs. @@ -258,6 +260,8 @@ struct cpudata { s16 epp_saved; u64 hwp_req_cached; u64 hwp_cap_cached; + u64 last_io_update; + unsigned int sched_flags; u32 hwp_boost_min; }; @@ -1460,9 +1464,44 @@ static inline void intel_pstate_hwp_boost_down(struct cpudata *cpu) cpu->last_update = cpu->sample.time; } +static inline void intel_pstate_update_util_hwp_local(struct cpudata *cpu, + u64 time) +{ + cpu->sample.time = time; + + if (cpu->sched_flags & SCHED_CPUFREQ_IOWAIT) { + bool do_io = false; + + cpu->sched_flags = 0; + /* + * Set iowait_boost flag and update time. Since IO WAIT flag + * is set all the time, we can't just conclude that there is + * some IO bound activity is scheduled on this CPU with just + * one occurrence. If we receive at least two in two + * consecutive ticks, then we treat as boost candidate. + */ + if (time_before64(time, cpu->last_io_update + 2 * TICK_NSEC)) + do_io = true; + + cpu->last_io_update = time; + + if (do_io) + intel_pstate_hwp_boost_up(cpu); + + } else { + intel_pstate_hwp_boost_down(cpu); + } +} + static inline void intel_pstate_update_util_hwp(struct update_util_data *data, u64 time, unsigned int flags) { + struct cpudata *cpu = container_of(data, struct cpudata, update_util); + + cpu->sched_flags |= flags; + + if (smp_processor_id() == cpu->cpu) + intel_pstate_update_util_hwp_local(cpu, time); } static inline void intel_pstate_calc_avg_perf(struct cpudata *cpu) |