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deps: prefer cpuinfo_cur_freq over scaling_cur_freq in uv_cpu_info() #62018

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deps: prefer cpuinfo_cur_freq over scaling_cur_freq in uv_cpu_info() #62018

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13 changes: 11 additions & 2 deletions deps/uv/src/unix/linux.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1886,10 +1886,19 @@ int uv_cpu_info(uv_cpu_info_t** ci, int* count) {
continue;

n++;
/* Prefer cpuinfo_cur_freq: it reads a hardware-cached value and avoids
* slow ACPI/SMM round-trips that scaling_cur_freq triggers on some AMD
* CPUs (especially inside containers), which can take ~20ms per core.
* Fall back to scaling_cur_freq when cpuinfo_cur_freq is not available.
*/
snprintf(buf, sizeof(buf),
"/sys/devices/system/cpu/cpu%u/cpufreq/scaling_cur_freq", cpu);

"/sys/devices/system/cpu/cpu%u/cpufreq/cpuinfo_cur_freq", cpu);
fp = uv__open_file(buf);
if (fp == NULL) {
snprintf(buf, sizeof(buf),
"/sys/devices/system/cpu/cpu%u/cpufreq/scaling_cur_freq", cpu);
fp = uv__open_file(buf);
}
if (fp == NULL)
continue;

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