Messages in this thread Patch in this message | | | From | Joel Fernandes <> | Subject | [PATCH v2 1/2] cpufreq: Make iowait boost a policy option | Date | Thu, 18 May 2017 23:23:43 -0700 |
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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.
Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Cc: Len Brown <lenb@kernel.org> Cc: Rafael J. Wysocki <rjw@rjwysocki.net> Cc: Viresh Kumar <viresh.kumar@linaro.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Joel Fernandes <joelaf@google.com> --- 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..5dddc21da4f6 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 = true; /* 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..0783d8b52ec8 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 */ + bool 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
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