sampler
simple C++ perf_event_open wrapper
Test
Usage
The input to a Sampler is a vector of addresses and a function to profile:
std::vector<const void*> addresses;
Sampler s(addresses, [&]() { f(); });
This will kick off a separate thread and fork a child process that invokes the passed in function. While the sampler is running, we can query for the results.
// does not interrupt background execution
std::vector<size_t> address_map = s.query();
Samples that fall in between the passed in addresses are counted.
Thus, address_map.size() == addresses.size() and address_map.back() == 0.
When you are finished with the sampler, call s.join() to kill
the thread and child process.