Messages in this thread | | | Subject | [RFC] Performance Events 'Samples' report | From | Cliff Wickman <> | Date | Thu, 24 Feb 2011 18:15:26 -0600 |
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From: Cliff Wickman <cpw@sgi.com>
The perf command's report prints clock periods under the heading of 'Samples'. Our applications people have been confused by this "Samples" heading.
perf report -n
# Overhead Samples Command Shared Object Symbol # ........ .......... ............... .................... ................................ # 99.41%1522136216246 pthreads pthreads [.] work_function 0.33% 4980298302 perf [kernel.kallsyms] [k] clear_page_c ....
It would be more compact to print the number of samples. And that would be consistent with the heading.
Below is the code that displays the periods. I don't see that the number of samples is available here, but probably easily could be. I presume that clock periods are derived from #samples * sample period.
perf/util/hist.c
640 641 if (symbol_conf.show_nr_samples) { 642 if (sep) 643 ret += snprintf(s + ret, size - ret, "%c%" PRIu64, *sep, period); 644 else 645 ret += snprintf(s + ret, size - ret, "%11" PRIu64, period); 646 } 647
Signed-off-by: Cliff Wickman <cpw@sgi.com>
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