src/share/vm/runtime/sweeper.cpp
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*** old/src/share/vm/runtime/sweeper.cpp Wed Nov 26 20:49:54 2014
--- new/src/share/vm/runtime/sweeper.cpp Wed Nov 26 20:49:54 2014
*** 140,152 ****
--- 140,149 ----
long NMethodSweeper::_traversals = 0; // Stack scan count, also sweep ID.
long NMethodSweeper::_total_nof_code_cache_sweeps = 0; // Total number of full sweeps of the code cache
long NMethodSweeper::_time_counter = 0; // Virtual time used to periodically invoke sweeper
long NMethodSweeper::_last_sweep = 0; // Value of _time_counter when the last sweep happened
int NMethodSweeper::_seen = 0; // Nof. nmethod we have currently processed in current pass of CodeCache
int NMethodSweeper::_flushed_count = 0; // Nof. nmethods flushed in current sweep
int NMethodSweeper::_zombified_count = 0; // Nof. nmethods made zombie in current sweep
int NMethodSweeper::_marked_for_reclamation_count = 0; // Nof. nmethods marked for reclaim in current sweep
volatile bool NMethodSweeper::_should_sweep = true; // Indicates if we should invoke the sweeper
volatile int NMethodSweeper::_bytes_changed = 0; // Counts the total nmethod size if the nmethod changed from:
// 1) alive -> not_entrant
// 2) not_entrant -> zombie
*** 159,168 ****
--- 156,166 ----
Tickspan NMethodSweeper::_total_time_sweeping; // Accumulated time sweeping
Tickspan NMethodSweeper::_total_time_this_sweep; // Total time this sweep
Tickspan NMethodSweeper::_peak_sweep_time; // Peak time for a full sweep
Tickspan NMethodSweeper::_peak_sweep_fraction_time; // Peak time sweeping one fraction
+ Monitor* NMethodSweeper::_stat_lock = new Monitor(Mutex::special, "Sweeper::Statistics", true);
class MarkActivationClosure: public CodeBlobClosure {
public:
virtual void do_code_blob(CodeBlob* cb) {
assert(cb->is_nmethod(), "CodeBlob should be nmethod");
*** 368,380 ****
--- 366,379 ----
void NMethodSweeper::sweep_code_cache() {
ResourceMark rm;
Ticks sweep_start_counter = Ticks::now();
! _flushed_count = 0;
! _zombified_count = 0;
! _marked_for_reclamation_count = 0;
! int flushed_count = 0;
! int zombified_count = 0;
! int marked_for_reclamation_count = 0;
+ int flushed_c2_count = 0;
if (PrintMethodFlushing && Verbose) {
tty->print_cr("### Sweep at %d out of %d", _seen, CodeCache::nof_nmethods());
}
*** 384,441 ****
--- 383,464 ----
int freed_memory = 0;
{
MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
// The last invocation iterates until there are no more nmethods
while (!_current.end()) {
swept_count++;
handle_safepoint_request();
// Since we will give up the CodeCache_lock, always skip ahead
// to the next nmethod. Other blobs can be deleted by other
// threads but nmethods are only reclaimed by the sweeper.
nmethod* nm = _current.method();
_current.next();
// Now ready to process nmethod and give up CodeCache_lock
{
MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
! freed_memory += process_nmethod(nm);
! int size = nm->total_size();
+ bool is_c2_method = nm->is_compiled_by_c2();
+
+ MethodStateChange type = process_nmethod(nm);
+ switch (type) {
+ case Flushed:
+ freed_memory += size;
+ ++flushed_count;
+ if (is_c2_method) {
+ ++flushed_c2_count;
+ }
+ break;
+ case MarkedForReclamation:
+ ++marked_for_reclamation_count;
+ break;
+ case MadeZombie:
+ ++zombified_count;
+ break;
+ case None:
+ break;
+ default:
+ ShouldNotReachHere();
+ }
}
_seen++;
+ handle_safepoint_request();
}
}
assert(_current.end(), "must have scanned the whole cache");
const Ticks sweep_end_counter = Ticks::now();
const Tickspan sweep_time = sweep_end_counter - sweep_start_counter;
+ {
+ MutexLockerEx mu(_stat_lock, Mutex::_no_safepoint_check_flag);
_total_time_sweeping += sweep_time;
_total_time_this_sweep += sweep_time;
_peak_sweep_fraction_time = MAX2(sweep_time, _peak_sweep_fraction_time);
_total_flushed_size += freed_memory;
! _total_nof_methods_reclaimed += _flushed_count;
! _total_nof_methods_reclaimed += flushed_count;
+ _total_nof_c2_methods_reclaimed += flushed_c2_count;
+ _peak_sweep_time = MAX2(_peak_sweep_time, _total_time_this_sweep);
+ }
EventSweepCodeCache event(UNTIMED);
if (event.should_commit()) {
event.set_starttime(sweep_start_counter);
event.set_endtime(sweep_end_counter);
event.set_sweepIndex(_traversals);
event.set_sweptCount(swept_count);
- event.set_flushedCount(_flushed_count);
- event.set_markedCount(_marked_for_reclamation_count);
- event.set_zombifiedCount(_zombified_count);
event.commit();
}
#ifdef ASSERT
if(PrintMethodFlushing) {
tty->print_cr("### sweeper: sweep time(%d): ", (jlong)sweep_time.value());
}
#endif
_peak_sweep_time = MAX2(_peak_sweep_time, _total_time_this_sweep);
log_sweep("finished");
// Sweeper is the only case where memory is released, check here if it
// is time to restart the compiler. Only checking if there is a certain
// amount of free memory in the code cache might lead to re-enabling
*** 509,522 ****
--- 532,546 ----
MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
nm->flush();
}
! int NMethodSweeper::process_nmethod(nmethod* nm) {
! NMethodSweeper::MethodStateChange NMethodSweeper::process_nmethod(nmethod* nm) {
+ assert(nm != NULL, "sanity");
assert(!CodeCache_lock->owned_by_self(), "just checking");
! int freed_memory = 0;
! MethodStateChange result = None;
// Make sure this nmethod doesn't get unloaded during the scan,
// since safepoints may happen during acquired below locks.
NMethodMarker nmm(nm);
SWEEP(nm);
*** 527,537 ****
--- 551,561 ----
// Clean inline caches that point to zombie/non-entrant methods
MutexLocker cl(CompiledIC_lock);
nm->cleanup_inline_caches();
SWEEP(nm);
}
! return freed_memory;
! return result;
}
if (nm->is_zombie()) {
// If it is the first time we see nmethod then we mark it. Otherwise,
// we reclaim it. When we have seen a zombie method twice, we know that
*** 539,563 ****
--- 563,585 ----
if (nm->is_marked_for_reclamation()) {
assert(!nm->is_locked_by_vm(), "must not flush locked nmethods");
if (PrintMethodFlushing && Verbose) {
tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (marked for reclamation) being flushed", nm->compile_id(), nm);
}
freed_memory = nm->total_size();
if (nm->is_compiled_by_c2()) {
_total_nof_c2_methods_reclaimed++;
}
release_nmethod(nm);
! _flushed_count++;
! assert(result == None, "sanity");
+ result = Flushed;
} else {
if (PrintMethodFlushing && Verbose) {
tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (zombie) being marked for reclamation", nm->compile_id(), nm);
}
nm->mark_for_reclamation();
// Keep track of code cache state change
_bytes_changed += nm->total_size();
_marked_for_reclamation_count++;
SWEEP(nm);
+ assert(result == None, "sanity");
+ result = MarkedForReclamation;
}
} else if (nm->is_not_entrant()) {
// If there are no current activations of this method on the
// stack we can safely convert it to a zombie method
if (nm->can_not_entrant_be_converted()) {
*** 574,585 ****
--- 596,608 ----
if (PrintMethodFlushing && Verbose) {
tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (not entrant) being made zombie", nm->compile_id(), nm);
}
// Code cache state change is tracked in make_zombie()
nm->make_zombie();
_zombified_count++;
SWEEP(nm);
+ assert(result == None, "sanity");
+ result = MadeZombie;
}
assert(nm->is_zombie(), "nmethod must be zombie");
} else {
// Still alive, clean up its inline caches
MutexLocker cl(CompiledIC_lock);
*** 592,621 ****
--- 615,642 ----
tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (unloaded) being made zombie", nm->compile_id(), nm);
}
if (nm->is_osr_method()) {
SWEEP(nm);
// No inline caches will ever point to osr methods, so we can just remove it
freed_memory = nm->total_size();
if (nm->is_compiled_by_c2()) {
_total_nof_c2_methods_reclaimed++;
}
release_nmethod(nm);
! _flushed_count++;
! assert(result == None, "sanity");
+ result = Flushed;
} else {
// Code cache state change is tracked in make_zombie()
nm->make_zombie();
_zombified_count++;
SWEEP(nm);
+ assert(result == None, "sanity");
+ result = MadeZombie;
}
} else {
possibly_flush(nm);
// Clean-up all inline caches that point to zombie/non-reentrant methods
MutexLocker cl(CompiledIC_lock);
nm->cleanup_inline_caches();
SWEEP(nm);
}
! return freed_memory;
! return result;
}
void NMethodSweeper::possibly_flush(nmethod* nm) {
if (UseCodeCacheFlushing) {
src/share/vm/runtime/sweeper.cpp
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