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| author | Brennan Shacklett <brennan@genyes.org> | 2013-10-21 12:20:32 -0400 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-10-21 19:15:38 -0400 |
| commit | d253d2a52676cfa3d89b8f0737a08ce7db665207 (patch) | |
| tree | 0764df6b50b68dea4c7d2984b5b9e599ef12f0f8 /tools/perf/scripts/python/event_analyzing_sample.py | |
| parent | 31d141e3a666269a3b6fcccddb0351caf7454240 (diff) | |
intel_pstate: Improve accuracy by not truncating until final result
This patch addresses Bug 60727
(https://bugzilla.kernel.org/show_bug.cgi?id=60727)
which was due to the truncation of intermediate values in the
calculations, which causes the code to consistently underestimate the
current cpu frequency, specifically 100% cpu utilization was truncated
down to the setpoint of 97%. This patch fixes the problem by keeping
the results of all intermediate calculations as fixed point numbers
rather scaling them back and forth between integers and fixed point.
References: https://bugzilla.kernel.org/show_bug.cgi?id=60727
Signed-off-by: Brennan Shacklett <bpshacklett@gmail.com>
Acked-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'tools/perf/scripts/python/event_analyzing_sample.py')
0 files changed, 0 insertions, 0 deletions