namespace art {
+static constexpr uint64_t kLongWaitMs = 100;
+
/*
* Every Object has a monitor associated with it, but not every Object is actually locked. Even
* the ones that are locked do not need a full-fledged monitor until a) there is actual contention
mirror::ArtMethod* owners_method = locking_method_;
uint32_t owners_dex_pc = locking_dex_pc_;
// Do this before releasing the lock so that we don't get deflated.
+ size_t num_waiters = num_waiters_;
++num_waiters_;
monitor_lock_.Unlock(self); // Let go of locks in order.
self->SetMonitorEnterObject(GetObject());
const char* owners_filename;
uint32_t owners_line_number;
TranslateLocation(owners_method, owners_dex_pc, &owners_filename, &owners_line_number);
+ if (wait_ms > kLongWaitMs && owners_method != nullptr) {
+ LOG(WARNING) << "Long monitor contention event with owner method="
+ << PrettyMethod(owners_method) << " from " << owners_filename << ":"
+ << owners_line_number << " waiters=" << num_waiters << " for "
+ << PrettyDuration(MsToNs(wait_ms));
+ }
LogContentionEvent(self, wait_ms, sample_percent, owners_filename, owners_line_number);
}
}