Messages in this thread Patch in this message | | | From | dirk.brandewie@gmail ... | Subject | [PATCH 2/5] intel_pstate: remove unneeded sample buffers | Date | Wed, 12 Feb 2014 10:01:04 -0800 |
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From: Dirk Brandewie <dirk.j.brandewie@intel.com>
Remove unneeded sample buffers, intel_pstate operates on the most recent sample only. This save some memory and make the code more readable.
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com> --- drivers/cpufreq/intel_pstate.c | 25 ++++++++++++------------- 1 file changed, 12 insertions(+), 13 deletions(-)
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index c788abf..d692b10 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -96,8 +96,7 @@ struct cpudata { u64 prev_aperf; u64 prev_mperf; unsigned long long prev_tsc; - int sample_ptr; - struct sample samples[SAMPLE_COUNT]; + struct sample sample; }; static struct cpudata **all_cpu_data; @@ -570,15 +569,15 @@ static inline void intel_pstate_sample(struct cpudata *cpu) rdmsrl(MSR_IA32_MPERF, mperf); tsc = native_read_tsc(); - cpu->sample_ptr = (cpu->sample_ptr + 1) % SAMPLE_COUNT; - cpu->samples[cpu->sample_ptr].aperf = aperf; - cpu->samples[cpu->sample_ptr].mperf = mperf; - cpu->samples[cpu->sample_ptr].tsc = tsc; - cpu->samples[cpu->sample_ptr].aperf -= cpu->prev_aperf; - cpu->samples[cpu->sample_ptr].mperf -= cpu->prev_mperf; - cpu->samples[cpu->sample_ptr].tsc -= cpu->prev_tsc; - intel_pstate_calc_busy(cpu, &cpu->samples[cpu->sample_ptr]); + cpu->sample.aperf = aperf; + cpu->sample.mperf = mperf; + cpu->sample.tsc = tsc; + cpu->sample.aperf -= cpu->prev_aperf; + cpu->sample.mperf -= cpu->prev_mperf; + cpu->sample.tsc -= cpu->prev_tsc; + + intel_pstate_calc_busy(cpu, &cpu->sample); cpu->prev_aperf = aperf; cpu->prev_mperf = mperf; @@ -598,7 +597,7 @@ static inline int32_t intel_pstate_get_scaled_busy(struct cpudata *cpu) { int32_t core_busy, max_pstate, current_pstate; - core_busy = cpu->samples[cpu->sample_ptr].core_pct_busy; + core_busy = cpu->sample.core_pct_busy; max_pstate = int_tofp(cpu->pstate.max_pstate); current_pstate = int_tofp(cpu->pstate.current_pstate); return mul_fp(core_busy, div_fp(max_pstate, current_pstate)); @@ -631,7 +630,7 @@ static void intel_pstate_timer_func(unsigned long __data) intel_pstate_sample(cpu); - sample = &cpu->samples[cpu->sample_ptr]; + sample = &cpu->sample; intel_pstate_adjust_busy_pstate(cpu); @@ -712,7 +711,7 @@ static unsigned int intel_pstate_get(unsigned int cpu_num) cpu = all_cpu_data[cpu_num]; if (!cpu) return 0; - sample = &cpu->samples[cpu->sample_ptr]; + sample = &cpu->sample; return sample->freq; } -- 1.8.3.1
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