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lscpu: read MHZ from /sys/.../cpufreq/scaling_cur_freq 

This is more portable and provides more stable results than
/proc/cpuinfo.

Fixes: https://github.com/karelzak/util-linux/pull/1317
Co-Author: Thomas Weißschuh
Signed-off-by: Karel Zak <kzak@redhat.com>
This commit is contained in:
Karel Zak 2021-05-25 13:23:39 +02:00
parent 0b538002da
commit f2d08d4ddc
1 changed files with 10 additions and 0 deletions
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10
sys-utils/lscpu-topology.c
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@ -546,6 +546,16 @@ static int read_mhz(struct lscpu_cxt *cxt, struct lscpu_cpu *cpu)
if (ul_path_readf_s32(sys, &mhz, "cpu%d/cpufreq/cpuinfo_min_freq", num) == 0)
cpu->mhz_min_freq = (float) mhz / 1000;
/* The default current-frequency value comes is from /proc/cpuinfo (if
* available). This /proc value is usually based on MSR registers
* (APERF/APERF) and it changes pretty often. It seems better to read
* frequency from cpufreq subsystem that provides the current frequency
* for the current policy. There is also cpuinfo_cur_freq in sysfs, but
* it's not always available.
*/
if (ul_path_readf_s32(sys, &mhz, "cpu%d/cpufreq/scaling_cur_freq", num) == 0)
cpu->mhz_cur_freq = (float) mhz / 1000;
if (cpu->type && (cpu->mhz_min_freq || cpu->mhz_max_freq))
cpu->type->has_freq = 1;