Yazen Ghannam d4794f25f1 tools/power turbostat: Make interval calculation per thread to reduce jitter ... Turbostat currently normalizes TSC and other values by dividing by an interval. This interval is the delta between the start of one global (all counters on all CPUs) sampling and the start of another. However, this introduces a lot of jitter into the data. In order to reduce jitter, the interval calculation should be based on timestamps taken per thread and close to the start of the thread's sampling. Define a per thread time value to hold the delta between samples taken on the thread. Use the timestamp taken at the beginning of sampling to calculate the delta. Move the thread's beginning timestamp to after the CPU migration to avoid jitter due to the migration. Use the global time delta for the average time delta. Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com> Signed-off-by: Len Brown <len.brown@intel.com>		2019-08-31 14:48:34 -04:00
..
intel_pstate_tracer	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 466	2019-06-19 17:09:10 +02:00
intel-speed-select	tools/power/x86/intel-speed-select: Add .gitignore file	2019-07-12 16:00:38 +03:00
turbostat	tools/power turbostat: Make interval calculation per thread to reduce jitter	2019-08-31 14:48:34 -04:00
x86_energy_perf_policy	tools/power x86_energy_perf_policy: Fix argument parsing	2019-08-31 14:48:34 -04:00