aha/tools/perf
Peter Zijlstra 63d40deb2e perf stat: Use stddev_mean in stead of stddev
When we're computing the mean by sampling the distribution,
then the std dev of the mean is related to the std dev of the
sample set by:

  stddev_mean = std_dev / sqrt(N)

Which is exactly what we want.

This results in the error on the mean decreasing with
increasing number of samples.

Also fix the scaled == -1, aka not counted case.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-04 17:38:14 +02:00
..
Documentation perf tools: Add missing parameters documentation 2009-08-31 10:04:47 +02:00
util perf trace: Fix read_string() 2009-09-03 16:22:45 +02:00
.gitignore perf_counter tools: Move from Documentation/perf_counter/ to tools/perf/ 2009-06-06 20:33:43 +02:00
builtin-annotate.c perf tools: Librarize idle thread registration 2009-08-31 10:04:48 +02:00
builtin-help.c perf: Enable more compiler warnings 2009-08-16 10:47:47 +02:00
builtin-list.c perf list: Fix large list output by using the pager 2009-08-13 09:05:48 +02:00
builtin-record.c perf trace: Sample timestamps as well 2009-09-03 15:45:49 +02:00
builtin-report.c perf tools: Librarize idle thread registration 2009-08-31 10:04:48 +02:00
builtin-stat.c perf stat: Use stddev_mean in stead of stddev 2009-09-04 17:38:14 +02:00
builtin-top.c perf top: Show RIP only in verbose mode 2009-08-26 20:21:45 +02:00
builtin-trace.c perf trace: Fix parsing of perf.data 2009-09-03 16:19:57 +02:00
builtin.h perf tools: Factorize high level dso helpers 2009-08-12 12:02:38 +02:00
command-list.txt perf_counter tools: Move from Documentation/perf_counter/ to tools/perf/ 2009-06-06 20:33:43 +02:00
CREDITS perf_counter tools: Add CREDITS file for Git contributors 2009-06-24 19:54:29 +02:00
design.txt perf_counter: Start documenting HAVE_PERF_COUNTERS requirements 2009-06-12 19:37:30 +02:00
Makefile perf tools: Clean up warnings list in the Makefile 2009-09-02 14:50:23 +02:00
perf.c perf tools: Add perf trace 2009-08-17 16:32:39 +02:00
perf.h perf tools: Librarize trace_event() helper 2009-08-16 23:06:45 +02:00