Matt Macy bfb46e2ba8 pmc: add filter command
pmc filter allows the user to select event types, threads, and processes from
a sample.

% pmcstat -S unhalted_core_cycles -S llc-misses -S -S  resource_stalls.any -O pmc.log
% pmc filter -e llc-misses pmc.log pmc-llc-misses.log
% pmc filter -e unhalted_core_cycles -t 100339  pmc.log pmc-core-cycles.log
etc...
% pmcstat -R pmc-core-cycles.log -G pmc-core-cycles.stacks
2018-06-04 04:59:48 +00:00
..
2018-06-04 04:59:48 +00:00
2018-05-31 22:26:55 +00:00
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2018-06-04 04:59:48 +00:00
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