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LibJS: Emit a profile signpost when starting a garbage collection

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This commit is contained in:
Andreas Kling 2021-08-11 20:31:11 +02:00
parent 3ed6c137df
commit 56e84a63ca
1 changed files with 18 additions and 0 deletions
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18
Userland/Libraries/LibJS/Heap/Heap.cpp
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@ -19,11 +19,24 @@
#include <LibJS/Runtime/WeakContainer.h> #include <LibJS/Runtime/WeakContainer.h>
#include <setjmp.h> #include <setjmp.h>
#ifdef __serenity__
# include <serenity.h>
#endif
namespace JS { namespace JS {
#ifdef __serenity__
static constexpr FlatPtr gc_perf_string_id = 0x13378086;
#endif
Heap::Heap(VM& vm) Heap::Heap(VM& vm)
: m_vm(vm) : m_vm(vm)
{ {
#ifdef __serenity__
auto gc_signpost_string = "Garbage collection"sv;
perf_register_string(gc_perf_string_id, gc_signpost_string.characters_without_null_termination(), gc_signpost_string.length());
#endif
if constexpr (HeapBlock::min_possible_cell_size <= 16) { if constexpr (HeapBlock::min_possible_cell_size <= 16) {
m_allocators.append(make<CellAllocator>(16)); m_allocators.append(make<CellAllocator>(16));
} }
@ -72,6 +85,11 @@ void Heap::collect_garbage(CollectionType collection_type, bool print_report)
VERIFY(!m_collecting_garbage); VERIFY(!m_collecting_garbage);
TemporaryChange change(m_collecting_garbage, true); TemporaryChange change(m_collecting_garbage, true);
#ifdef __serenity__
static size_t global_gc_counter = 0;
perf_event(PERF_EVENT_SIGNPOST, gc_perf_string_id, global_gc_counter++);
#endif
Core::ElapsedTimer collection_measurement_timer; Core::ElapsedTimer collection_measurement_timer;
collection_measurement_timer.start(); collection_measurement_timer.start();
if (collection_type == CollectionType::CollectGarbage) { if (collection_type == CollectionType::CollectGarbage) {