371   */
 372 void NMethodSweeper::force_sweep() {
 373   ThreadBlockInVM tbivm(JavaThread::current());
 374   MutexLockerEx waiter(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 375   // Request forced sweep
 376   _force_sweep = true;
 377   while (_force_sweep) {
 378     // Notify sweeper that we want to force a sweep and wait for completion.
 379     // In case a sweep currently takes place we timeout and try again because
 380     // we want to enforce a full sweep.
 381     CodeCache_lock->notify();
 382     CodeCache_lock->wait(Mutex::_no_safepoint_check_flag, 1000);
 383   }
 384 }
 385 
 386 /**
 387  * Handle a safepoint request
 388  */
 389 void NMethodSweeper::handle_safepoint_request() {
 390   JavaThread* thread = JavaThread::current();
 391   if (SafepointMechanism::poll(thread)) {
 392     if (PrintMethodFlushing && Verbose) {
 393       tty->print_cr("### Sweep at %d out of %d, yielding to safepoint", _seen, CodeCache::nmethod_count());
 394     }
 395     MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 396 
 397     ThreadBlockInVM tbivm(thread);
 398     thread->java_suspend_self();
 399   }
 400 }
 401 
 402 /**
 403  * This function invokes the sweeper if at least one of the three conditions is met:
 404  *    (1) The code cache is getting full
 405  *    (2) There are sufficient state changes in/since the last sweep.
 406  *    (3) We have not been sweeping for 'some time'
 407  */
 408 void NMethodSweeper::possibly_sweep() {
 409   assert(JavaThread::current()->thread_state() == _thread_in_vm, "must run in vm mode");
 410   // If there was no state change while nmethod sweeping, 'should_sweep' will be false.
 411   // This is one of the two places where should_sweep can be set to true. The general

 371   */
 372 void NMethodSweeper::force_sweep() {
 373   ThreadBlockInVM tbivm(JavaThread::current());
 374   MutexLockerEx waiter(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 375   // Request forced sweep
 376   _force_sweep = true;
 377   while (_force_sweep) {
 378     // Notify sweeper that we want to force a sweep and wait for completion.
 379     // In case a sweep currently takes place we timeout and try again because
 380     // we want to enforce a full sweep.
 381     CodeCache_lock->notify();
 382     CodeCache_lock->wait(Mutex::_no_safepoint_check_flag, 1000);
 383   }
 384 }
 385 
 386 /**
 387  * Handle a safepoint request
 388  */
 389 void NMethodSweeper::handle_safepoint_request() {
 390   JavaThread* thread = JavaThread::current();
 391   if (SafepointMechanism::should_block(thread)) {
 392     if (PrintMethodFlushing && Verbose) {
 393       tty->print_cr("### Sweep at %d out of %d, yielding to safepoint", _seen, CodeCache::nmethod_count());
 394     }
 395     MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 396 
 397     ThreadBlockInVM tbivm(thread);
 398     thread->java_suspend_self();
 399   }
 400 }
 401 
 402 /**
 403  * This function invokes the sweeper if at least one of the three conditions is met:
 404  *    (1) The code cache is getting full
 405  *    (2) There are sufficient state changes in/since the last sweep.
 406  *    (3) We have not been sweeping for 'some time'
 407  */
 408 void NMethodSweeper::possibly_sweep() {
 409   assert(JavaThread::current()->thread_state() == _thread_in_vm, "must run in vm mode");
 410   // If there was no state change while nmethod sweeping, 'should_sweep' will be false.
 411   // This is one of the two places where should_sweep can be set to true. The general