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| author |   Gautham R. Shenoy <gautham.shenoy@amd.com> | 2025-06-12 17:53:54 +0530 |
|---|---|---|
| committer |   Shuah Khan <skhan@linuxfoundation.org> | 2025-06-18 16:21:12 -0600 |
| commit | cda7ac8ce7de84cf32a3871ba5f318aa3b79381e (patch) | |
| tree | f410783f24e89521fac0cfbb70faa820a3089f0e /tools/perf/scripts/python | |
| parent | cpupower: split unitdir from libdir in Makefile (diff) | |
| download | wireguard-linux-cda7ac8ce7de84cf32a3871ba5f318aa3b79381e.tar.xz wireguard-linux-cda7ac8ce7de84cf32a3871ba5f318aa3b79381e.zip | |
pm: cpupower: Fix the snapshot-order of tsc,mperf, clock in mperf_stop()
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>
Diffstat (limited to 'tools/perf/scripts/python')
0 files changed, 0 insertions, 0 deletions