AcoSail/kernel_optimize_test
8
0
Fork 0
forked from luck/tmp_suning_uos_patched
Code Pull Requests Activity

cpufreq: intel_pstate: Remove core_pct rounding

Browse Source 
The specific rounding adds conditionally only 1/256 to fractional
part of core_pct.

We can safely remove it without any noticeable impact in
calculations.

Use div64_u64 instead of div_u64 to avoid possible overflow of
sample->mperf as divisor

Signed-off-by: Stratos Karafotis <stratosk@semaphore.gr>
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Stratos Karafotis 2014-07-18 08:37:27 -07:00 committed by Rafael J. Wysocki
parent 4b707c893d
commit 78e2708691
1 changed files with 1 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/cpufreq/intel_pstate.c
View File

@ -545,13 +545,9 @@ static inline void intel_pstate_calc_busy(struct cpudata *cpu)
{ {
struct sample *sample = &cpu->sample; struct sample *sample = &cpu->sample;
int64_t core_pct; int64_t core_pct;
int32_t rem;
core_pct = int_tofp(sample->aperf) * int_tofp(100); core_pct = int_tofp(sample->aperf) * int_tofp(100);
core_pct = div_u64_rem(core_pct, int_tofp(sample->mperf), &rem); core_pct = div64_u64(core_pct, int_tofp(sample->mperf));
if ((rem << 1) >= int_tofp(sample->mperf))
core_pct += 1;
sample->freq = fp_toint( sample->freq = fp_toint(
mul_fp(int_tofp(cpu->pstate.max_pstate * 1000), core_pct)); mul_fp(int_tofp(cpu->pstate.max_pstate * 1000), core_pct));