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linux/tools/power/cpupower/utils
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He Rongguang 4a3b902a4a cpupower: fix TSC MHz calculation 
[ Upstream commit 9d6c0e5851 ]

Commit 'cpupower: Make TSC read per CPU for Mperf monitor' (c2adb1877b)
changes TSC counter reads per cpu, but left time diff global (from start
of all cpus to end of all cpus), thus diff(time) is too large for a
cpu's tsc counting, resulting in far less than acutal TSC_Mhz and thus
`cpupower monitor` showing far less than actual cpu realtime frequency.

/proc/cpuinfo shows frequency:
cat /proc/cpuinfo | egrep -e 'processor' -e 'MHz'
...
processor : 171
cpu MHz   : 4108.498
...

before fix (System 100% busy):
    | Mperf              || Idle_Stats
 CPU| C0   | Cx   | Freq  || POLL | C1   | C2
 171|  0.77| 99.23|  2279||  0.00|  0.00|  0.00

after fix (System 100% busy):
    | Mperf              || Idle_Stats
 CPU| C0   | Cx   | Freq  || POLL | C1   | C2
 171|  0.46| 99.54|  4095||  0.00|  0.00|  0.00

Fixes: c2adb1877b ("cpupower: Make TSC read per CPU for Mperf monitor")
Signed-off-by: He Rongguang <herongguang@linux.alibaba.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-02-08 09:57:05 +01:00
..
helpers tools/power/cpupower: Fix Pstate frequency reporting on AMD Family 1Ah CPUs 2024-05-28 09:22:57 -06:00
idle_monitor cpupower: fix TSC MHz calculation 2025-02-08 09:57:05 +01:00
builtin.h cpupower: Introduce powercap intel-rapl library and powercap-info command 2022-11-30 16:48:28 -07:00
cpufreq-info.c tools/cpupower: Choose base_cpu to display default cpupower details 2022-11-25 10:50:04 -07:00
cpufreq-set.c cpupower: Provide online and offline CPU information 2020-10-26 13:36:24 -06:00
cpuidle-info.c tools/cpupower: display residency value in idle-info 2024-08-09 10:32:33 -06:00
cpuidle-set.c cpupower: Fix cpuidle_set to accept only numeric values for idle-set operation. 2023-07-18 16:07:08 -06:00
cpupower-info.c tools/cpupower: Choose base_cpu to display default cpupower details 2022-11-25 10:50:04 -07:00
cpupower-set.c cpupower: Add turbo-boost support in cpupower 2023-07-18 16:07:01 -06:00
cpupower.c cpupower: Introduce powercap intel-rapl library and powercap-info command 2022-11-30 16:48:28 -07:00
powercap-info.c cpupower: Introduce powercap intel-rapl library and powercap-info command 2022-11-30 16:48:28 -07:00
version-gen.sh License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00