diff options
| author | Yaxiong Tian <tianyaxiong@kylinos.cn> | 2025-09-12 15:35:02 +0800 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2025-09-19 23:21:01 +0200 |
| commit | 02d09026a88f227aa1f4687bd31d6ffc4970e8be (patch) | |
| tree | e82f742f81744acf671b2bc8247158f70df573f1 | |
| parent | 7c0dde86c17665cb27e1c8dd23d263e2ed2d5b50 (diff) | |
cpufreq: intel_pstate: Use likely() optimization in intel_pstate_sample()
The comment above the condition `if (cpu->last_sample_time)` clearly
indicates that the branch is taken for the vast majority of invocations
after the first sample in a cycle. The first sample is a one-time
initialization case.
Add likely() hint to the condition to improve branch prediction for
this performance-critical path in intel_pstate_sample().
Signed-off-by: Yaxiong Tian <tianyaxiong@kylinos.cn>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
| -rw-r--r-- | drivers/cpufreq/intel_pstate.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 285051e4a5dd..05e440a6aa4a 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -2542,7 +2542,7 @@ static inline bool intel_pstate_sample(struct cpudata *cpu, u64 time) * that sample.time will always be reset before setting the utilization * update hook and make the caller skip the sample then. */ - if (cpu->last_sample_time) { + if (likely(cpu->last_sample_time)) { intel_pstate_calc_avg_perf(cpu); return true; } |