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| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2017-03-03 23:51:31 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2017-03-04 01:38:42 +0100 |
| commit | 6407829901f074cf6beef566d6af9a0b0e238f0d (patch) | |
| tree | 802307972d0c9381851bcb76c38f3ddfc0384983 /drivers/cpufreq | |
| parent | 7f17326fc0b69afbda7aed6c4ce8e2328b74203b (diff) | |
| download | linux-6407829901f074cf6beef566d6af9a0b0e238f0d.tar.bz2 | |
cpufreq: intel_pstate: Avoid triggering cpu_frequency tracepoint unnecessarily
In the passive mode the cpu_frequency trace event is already
triggered by the cpufreq core or by scaling governors, so
intel_pstate should not trigger it once again for the same
P-state updates.
In addition to that, the frequency returned by
intel_cpufreq_fast_switch() and passed via freqs.new from
intel_cpufreq_target() to cpufreq_freq_transition_end() should
reflect the P-state actually set, so make that happen.
Fixes: 001c76f05b01 (cpufreq: intel_pstate: Generic governors support)
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq')
| -rw-r--r-- | drivers/cpufreq/intel_pstate.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 04b2aa162276..5e066b332598 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -1879,13 +1879,11 @@ static int intel_pstate_prepare_request(struct cpudata *cpu, int pstate) intel_pstate_get_min_max(cpu, &min_perf, &max_perf); pstate = clamp_t(int, pstate, min_perf, max_perf); - trace_cpu_frequency(pstate * cpu->pstate.scaling, cpu->cpu); return pstate; } static void intel_pstate_update_pstate(struct cpudata *cpu, int pstate) { - pstate = intel_pstate_prepare_request(cpu, pstate); if (pstate == cpu->pstate.current_pstate) return; @@ -1905,6 +1903,8 @@ static inline void intel_pstate_adjust_busy_pstate(struct cpudata *cpu) update_turbo_state(); + target_pstate = intel_pstate_prepare_request(cpu, target_pstate); + trace_cpu_frequency(target_pstate * cpu->pstate.scaling, cpu->cpu); intel_pstate_update_pstate(cpu, target_pstate); sample = &cpu->sample; @@ -2365,6 +2365,7 @@ static int intel_cpufreq_target(struct cpufreq_policy *policy, wrmsrl_on_cpu(policy->cpu, MSR_IA32_PERF_CTL, pstate_funcs.get_val(cpu, target_pstate)); } + freqs.new = target_pstate * cpu->pstate.scaling; cpufreq_freq_transition_end(policy, &freqs, false); return 0; @@ -2378,8 +2379,9 @@ static unsigned int intel_cpufreq_fast_switch(struct cpufreq_policy *policy, target_freq = intel_cpufreq_turbo_update(cpu, policy, target_freq); target_pstate = DIV_ROUND_UP(target_freq, cpu->pstate.scaling); + target_pstate = intel_pstate_prepare_request(cpu, target_pstate); intel_pstate_update_pstate(cpu, target_pstate); - return target_freq; + return target_pstate * cpu->pstate.scaling; } static int intel_cpufreq_cpu_init(struct cpufreq_policy *policy) |