Hi all,
I'm trying to use libpfm to collect performance counter data for some
multi-threaded applications. I would like to aggregate the data for all the
child threads under the same process. I found that the "inherit" flag does
not work for existing children threads as suggested by perf_event_open
<http://man7.org/linux/man-pages/man2/perf_event_open.2.html>.
*inherit*
The *inherit* bit specifies that this counter should count
events of child tasks as well as the task specified. This
applies only to new children, not to any existing children at
the time the counter is created (nor to any new children of
existing children).
However, it seems to me that the tool perf stat
<https://perf.wiki.kernel.org/index.php/Main_Page> that comes with Linux
kernel works just fine in this case, which aggregates the counter data for
all the child threads even when they already exist.
I was wondering how I can use libpfm to achieve the same purpose, or how perf
stat implements this functionality.
Thank you!
Yunqi
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