diff options
Diffstat (limited to 'drivers/cpufreq/intel_pstate.c')
| -rw-r--r-- | drivers/cpufreq/intel_pstate.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 2eac2adff11b..532e261b2cab 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -1526,6 +1526,15 @@ static void intel_pstate_update_util(struct update_util_data *data, u64 time, if (flags & SCHED_CPUFREQ_IOWAIT) { cpu->iowait_boost = int_tofp(1); + cpu->last_update = time; + /* + * The last time the busy was 100% so P-state was max anyway + * so avoid overhead of computation. + */ + if (fp_toint(cpu->sample.busy_scaled) == 100) + return; + + goto set_pstate; } else if (cpu->iowait_boost) { /* Clear iowait_boost if the CPU may have been idle. */ delta_ns = time - cpu->last_update; @@ -1537,6 +1546,7 @@ static void intel_pstate_update_util(struct update_util_data *data, u64 time, if ((s64)delta_ns < INTEL_PSTATE_DEFAULT_SAMPLING_INTERVAL) return; +set_pstate: if (intel_pstate_sample(cpu, time)) { int target_pstate; |