On Tue, Jun 1, 2010 at 4:35 PM, stephane eranian <eran...@googlemail.com>wrote:
> Dan, > > Thanks, I think that does answer it. Follow-up question: is there an > easy > > way to also collect the PC at each sample, using libpfm4? Or would the > best > > way to do it be each time in print_counts to also open and read > > /proc/$pid/stat? > > > For sampling, you want to take a look at task_smpl.c instead. Perf_events > does use an in-kernel sampling buffer and it is available to the user via > mmap(). For each sample you can ask it to record the IP. So look at the > example, and send me question if you need more help. > Well, what I'm aiming for is a time-based sample that includes the performance event counts and PC. I've used task_smpl as a base before, but I was under the impression that it used the counters as a sampling trigger, and there wasn't really any way to maybe use one counter to trigger sampling while using other counters in counting mode.
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