While profiling kernel functions via ftrace I noticed values of s^2 that seemed odd. I implemented a test to verify correctness of averages and s^2 calculations and proved the latter to be wrong. Then I fixed them up.
The first patch refactors function_stat_show() code a bit in order to be able to implement the test (second patch). Third patch fixes up s^2 calculation (applying Welford's method). Juri Lelli (3): ftrace: refactor basis statistics calculation code ftrace: test basic statistics calculation ftrace: fix stddev calculation kernel/trace/ftrace.c | 50 ++++++++++++++-------------- kernel/trace/trace.h | 16 +++++++++ kernel/trace/trace_selftest.c | 72 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 114 insertions(+), 24 deletions(-) -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
