Gautham R. Shenoy ddb96ab185 pm: cpupower: Fix the snapshot-order of tsc,mperf, clock in mperf_stop() ... [ Upstream commit cda7ac8ce7 ] In the function mperf_start(), mperf_monitor snapshots the time, tsc and finally the aperf,mperf MSRs. However, this order of snapshotting in is reversed in mperf_stop(). As a result, the C0 residency (which is computed as delta_mperf * 100 / delta_tsc) is under-reported on CPUs that is 100% busy. Fix this by snapshotting time, tsc and then aperf,mperf in mperf_stop() in the same order as in mperf_start(). Link: https://lore.kernel.org/r/20250612122355.19629-2-gautham.shenoy@amd.com Signed-off-by: Gautham R. Shenoy <gautham.shenoy@amd.com> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2025-08-28 16:24:19 +02:00
..
acpi
cpupower	pm: cpupower: Fix the snapshot-order of tsc,mperf, clock in mperf_stop()	2025-08-28 16:24:19 +02:00
pm-graph
x86	tools/power turbostat: Remember global max_die_id	2024-07-18 13:07:30 +02:00