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8025277: Add -XX: flag to print code cache sweeper statistics
New diagnostic flag prints statistics about the code cache sweeper Reviewed-by: kvn
This commit is contained in:
Tobias Hartmann
Albert Noll
parent
0679f774af
commit
63f7ba0045
4 changed files with 66 additions and 31 deletions
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@ -2531,6 +2531,9 @@ class CommandLineFlags {
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develop(bool, PrintMethodFlushing, false, \
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"Print the nmethods being flushed") \
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\
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diagnostic(bool, PrintMethodFlushingStatistics, false, \
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"print statistics about method flushing") \
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\
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develop(bool, UseRelocIndex, false, \
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"Use an index to speed random access to relocations") \
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\
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@ -52,6 +52,7 @@
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#include "runtime/memprofiler.hpp"
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#include "runtime/sharedRuntime.hpp"
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#include "runtime/statSampler.hpp"
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#include "runtime/sweeper.hpp"
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#include "runtime/task.hpp"
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#include "runtime/thread.inline.hpp"
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#include "runtime/timer.hpp"
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@ -217,9 +218,7 @@ AllocStats alloc_stats;
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// General statistics printing (profiling ...)
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void print_statistics() {
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#ifdef ASSERT
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if (CountRuntimeCalls) {
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@ -315,6 +314,10 @@ void print_statistics() {
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CodeCache::print();
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}
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if (PrintMethodFlushingStatistics) {
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NMethodSweeper::print();
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}
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if (PrintCodeCache2) {
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MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
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CodeCache::print_internals();
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@ -382,6 +385,10 @@ void print_statistics() {
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CodeCache::print();
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}
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if (PrintMethodFlushingStatistics) {
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NMethodSweeper::print();
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}
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#ifdef COMPILER2
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if (PrintPreciseBiasedLockingStatistics) {
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OptoRuntime::print_named_counters();
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@ -129,6 +129,7 @@ void NMethodSweeper::record_sweep(nmethod* nm, int line) {
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nmethod* NMethodSweeper::_current = NULL; // Current nmethod
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long NMethodSweeper::_traversals = 0; // Stack scan count, also sweep ID.
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long NMethodSweeper::_total_nof_code_cache_sweeps = 0; // Total number of full sweeps of the code cache
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long NMethodSweeper::_time_counter = 0; // Virtual time used to periodically invoke sweeper
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long NMethodSweeper::_last_sweep = 0; // Value of _time_counter when the last sweep happened
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int NMethodSweeper::_seen = 0; // Nof. nmethod we have currently processed in current pass of CodeCache
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@ -143,13 +144,16 @@ volatile int NMethodSweeper::_bytes_changed = 0; // Counts the tot
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// 1) alive -> not_entrant
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// 2) not_entrant -> zombie
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// 3) zombie -> marked_for_reclamation
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int NMethodSweeper::_hotness_counter_reset_val = 0;
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int NMethodSweeper::_total_nof_methods_reclaimed = 0; // Accumulated nof methods flushed
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long NMethodSweeper::_total_nof_methods_reclaimed = 0; // Accumulated nof methods flushed
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long NMethodSweeper::_total_nof_c2_methods_reclaimed = 0; // Accumulated nof methods flushed
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size_t NMethodSweeper::_total_flushed_size = 0; // Total number of bytes flushed from the code cache
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Tickspan NMethodSweeper::_total_time_sweeping; // Accumulated time sweeping
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Tickspan NMethodSweeper::_total_time_this_sweep; // Total time this sweep
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Tickspan NMethodSweeper::_peak_sweep_time; // Peak time for a full sweep
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Tickspan NMethodSweeper::_peak_sweep_fraction_time; // Peak time sweeping one fraction
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int NMethodSweeper::_hotness_counter_reset_val = 0;
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class MarkActivationClosure: public CodeBlobClosure {
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@ -292,6 +296,7 @@ void NMethodSweeper::possibly_sweep() {
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// We are done with sweeping the code cache once.
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if (_sweep_fractions_left == 0) {
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_total_nof_code_cache_sweeps++;
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_last_sweep = _time_counter;
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// Reset flag; temporarily disables sweeper
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_should_sweep = false;
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@ -378,6 +383,7 @@ void NMethodSweeper::sweep_code_cache() {
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_total_time_sweeping += sweep_time;
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_total_time_this_sweep += sweep_time;
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_peak_sweep_fraction_time = MAX2(sweep_time, _peak_sweep_fraction_time);
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_total_flushed_size += freed_memory;
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_total_nof_methods_reclaimed += _flushed_count;
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EventSweepCodeCache event(UNTIMED);
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@ -509,6 +515,9 @@ int NMethodSweeper::process_nmethod(nmethod *nm) {
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tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (marked for reclamation) being flushed", nm->compile_id(), nm);
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}
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freed_memory = nm->total_size();
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if (nm->is_compiled_by_c2()) {
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_total_nof_c2_methods_reclaimed++;
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}
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release_nmethod(nm);
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_flushed_count++;
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} else {
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@ -547,6 +556,9 @@ int NMethodSweeper::process_nmethod(nmethod *nm) {
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SWEEP(nm);
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// No inline caches will ever point to osr methods, so we can just remove it
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freed_memory = nm->total_size();
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if (nm->is_compiled_by_c2()) {
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_total_nof_c2_methods_reclaimed++;
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}
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release_nmethod(nm);
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_flushed_count++;
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} else {
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@ -634,3 +646,13 @@ void NMethodSweeper::log_sweep(const char* msg, const char* format, ...) {
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xtty->end_elem();
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}
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}
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void NMethodSweeper::print() {
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ttyLocker ttyl;
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tty->print_cr("Code cache sweeper statistics:");
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tty->print_cr(" Total sweep time: %1.0lfms", (double)_total_time_sweeping.value()/1000000);
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tty->print_cr(" Total number of full sweeps: %ld", _total_nof_code_cache_sweeps);
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tty->print_cr(" Total number of flushed methods: %ld(%ld C2 methods)", _total_nof_methods_reclaimed,
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_total_nof_c2_methods_reclaimed);
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tty->print_cr(" Total size of flushed methods: " SIZE_FORMAT "kB", _total_flushed_size/K);
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}
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@ -55,6 +55,7 @@
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class NMethodSweeper : public AllStatic {
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static long _traversals; // Stack scan count, also sweep ID.
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static long _total_nof_code_cache_sweeps; // Total number of full sweeps of the code cache
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static long _time_counter; // Virtual time used to periodically invoke sweeper
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static long _last_sweep; // Value of _time_counter when the last sweep happened
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static nmethod* _current; // Current nmethod
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@ -71,7 +72,11 @@ class NMethodSweeper : public AllStatic {
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// 2) not_entrant -> zombie
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// 3) zombie -> marked_for_reclamation
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// Stat counters
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static int _total_nof_methods_reclaimed; // Accumulated nof methods flushed
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static long _total_nof_methods_reclaimed; // Accumulated nof methods flushed
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static long _total_nof_c2_methods_reclaimed; // Accumulated nof C2-compiled methods flushed
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static size_t _total_flushed_size; // Total size of flushed methods
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static int _hotness_counter_reset_val;
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static Tickspan _total_time_sweeping; // Accumulated time sweeping
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static Tickspan _total_time_this_sweep; // Total time this sweep
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static Tickspan _peak_sweep_time; // Peak time for a full sweep
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@ -83,8 +88,6 @@ class NMethodSweeper : public AllStatic {
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static bool sweep_in_progress();
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static void sweep_code_cache();
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static int _hotness_counter_reset_val;
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public:
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static long traversal_count() { return _traversals; }
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static int total_nof_methods_reclaimed() { return _total_nof_methods_reclaimed; }
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@ -105,10 +108,10 @@ class NMethodSweeper : public AllStatic {
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static void mark_active_nmethods(); // Invoked at the end of each safepoint
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static void possibly_sweep(); // Compiler threads call this to sweep
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static int sort_nmethods_by_hotness(nmethod** nm1, nmethod** nm2);
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static int hotness_counter_reset_val();
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static void report_state_change(nmethod* nm);
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static void possibly_enable_sweeper();
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static void print(); // Printing/debugging
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};
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#endif // SHARE_VM_RUNTIME_SWEEPER_HPP
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