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vm: release memory used by sampler vectors

db4
Joe Groff 2011-10-30 18:41:14 -07:00
parent 9f6f36fdec
commit 1089816b21
2 changed files with 12 additions and 1 deletions
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12
vm/sampling_profiler.cpp
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@ -61,11 +61,21 @@ void factor_vm::set_sampling_profiler(bool sampling_p)
end_sampling_profiler(); end_sampling_profiler();
} }
void factor_vm::clear_samples()
{
// Swapping into temporaries releases the vector's allocated storage,
// whereas clear() would leave the allocation as-is
std::vector<profiling_sample> sample_graveyard;
std::vector<code_block*> sample_callstack_graveyard;
samples.swap(sample_graveyard);
sample_callstacks.swap(sample_callstack_graveyard);
}
void factor_vm::start_sampling_profiler() void factor_vm::start_sampling_profiler()
{ {
safepoint_sample_count = 0; safepoint_sample_count = 0;
safepoint_gc_sample_count = 0; safepoint_gc_sample_count = 0;
samples.clear(); clear_samples();
samples.reserve(10*FACTOR_PROFILE_SAMPLES_PER_SECOND); samples.reserve(10*FACTOR_PROFILE_SAMPLES_PER_SECOND);
sample_callstacks.reserve(100*FACTOR_PROFILE_SAMPLES_PER_SECOND); sample_callstacks.reserve(100*FACTOR_PROFILE_SAMPLES_PER_SECOND);
sampling_profiler_p = true; sampling_profiler_p = true;

1
vm/vm.hpp
View File

@ -191,6 +191,7 @@ struct factor_vm
void primitive_counting_profiler(); void primitive_counting_profiler();
/* Sampling profiler */ /* Sampling profiler */
void clear_samples();
void record_sample(); void record_sample();
void record_callstack_sample(cell *begin, cell *end); void record_callstack_sample(cell *begin, cell *end);
void start_sampling_profiler(); void start_sampling_profiler();