archive/jdk
1
0
Fork 0
mirror of https://github.com/openjdk/jdk.git synced 2025-09-20 02:54:35 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

8025277: Add -XX: flag to print code cache sweeper statistics

Browse source 
New diagnostic flag prints statistics about the code cache sweeper

Reviewed-by: kvn
This commit is contained in:
Tobias Hartmann 2013-12-19 14:08:02 +01:00 • committed by Albert Noll
parent 0679f774af
commit 63f7ba0045
4 changed files with 66 additions and 31 deletions
Download patch file Download diff file Expand all files Collapse all files

34
hotspot/src/share/vm/runtime/sweeper.cpp
View file

@ -129,6 +129,7 @@ void NMethodSweeper::record_sweep(nmethod* nm, int line) {
nmethod* NMethodSweeper::_current = NULL; // Current nmethod
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
@ -143,13 +144,16 @@ volatile int NMethodSweeper::_bytes_changed = 0; // Counts the tot
// 1) alive -> not_entrant
// 2) not_entrant -> zombie
// 3) zombie -> marked_for_reclamation
int NMethodSweeper::_hotness_counter_reset_val = 0;
long NMethodSweeper::_total_nof_methods_reclaimed = 0; // Accumulated nof methods flushed
long NMethodSweeper::_total_nof_c2_methods_reclaimed = 0; // Accumulated nof methods flushed
size_t NMethodSweeper::_total_flushed_size = 0; // Total number of bytes flushed from the code cache
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
int NMethodSweeper::_total_nof_methods_reclaimed = 0; // Accumulated nof methods flushed
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
int NMethodSweeper::_hotness_counter_reset_val = 0;
class MarkActivationClosure: public CodeBlobClosure {
@ -292,6 +296,7 @@ void NMethodSweeper::possibly_sweep() {
// We are done with sweeping the code cache once.
if (_sweep_fractions_left == 0) {
_total_nof_code_cache_sweeps++;
_last_sweep = _time_counter;
// Reset flag; temporarily disables sweeper
_should_sweep = false;
@ -378,6 +383,7 @@ void NMethodSweeper::sweep_code_cache() {
_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;
EventSweepCodeCache event(UNTIMED);
@ -509,6 +515,9 @@ int NMethodSweeper::process_nmethod(nmethod *nm) {
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++;
} else {
@ -547,6 +556,9 @@ int NMethodSweeper::process_nmethod(nmethod *nm) {
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++;
} else {
@ -634,3 +646,13 @@ void NMethodSweeper::log_sweep(const char* msg, const char* format, ...) {
xtty->end_elem();
}
}
void NMethodSweeper::print() {
ttyLocker ttyl;
tty->print_cr("Code cache sweeper statistics:");
tty->print_cr(" Total sweep time: %1.0lfms", (double)_total_time_sweeping.value()/1000000);
tty->print_cr(" Total number of full sweeps: %ld", _total_nof_code_cache_sweeps);
tty->print_cr(" Total number of flushed methods: %ld(%ld C2 methods)", _total_nof_methods_reclaimed,
_total_nof_c2_methods_reclaimed);
tty->print_cr(" Total size of flushed methods: " SIZE_FORMAT "kB", _total_flushed_size/K);
}