Make iowait boost a cpufreq policy option and enable it for intel_pstate cpufreq driver. Governors like schedutil can use it to determine if boosting for tasks that wake up with p->in_iowait set is needed.
Signed-off-by: Joel Fernandes <[email protected]> --- drivers/cpufreq/intel_pstate.c | 1 + include/linux/cpufreq.h | 3 +++ 2 files changed, 4 insertions(+) diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index b7de5bd76a31..a3099f099779 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -2239,6 +2239,7 @@ static int intel_cpufreq_cpu_init(struct cpufreq_policy *policy) policy->cpuinfo.transition_latency = INTEL_CPUFREQ_TRANSITION_LATENCY; policy->transition_delay_us = INTEL_CPUFREQ_TRANSITION_DELAY; + policy->iowait_boost_enable = 1; /* This reflects the intel_pstate_get_cpu_pstates() setting. */ policy->cur = policy->cpuinfo.min_freq; diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index a5ce0bbeadb5..4bb086dbe7ec 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -127,6 +127,9 @@ struct cpufreq_policy { */ unsigned int transition_delay_us; + /* Boost switch for tasks with p->in_iowait set */ + unsigned int iowait_boost_enable; + /* Cached frequency lookup from cpufreq_driver_resolve_freq. */ unsigned int cached_target_freq; int cached_resolved_idx; -- 2.13.0.303.g4ebf302169-goog
