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8210857: Allow retiring TLABs and collecting statistics in parallel
Reviewed-by: sjohanss, eosterlund
This commit is contained in:
Per Lidén
parent
92575fc3f0
commit
c0d0cbc4f1
5 changed files with 236 additions and 283 deletions
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@ -32,18 +32,9 @@
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#include "runtime/threadSMR.hpp"
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#include "utilities/copy.hpp"
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// Thread-Local Edens support
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// static member initialization
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size_t ThreadLocalAllocBuffer::_max_size = 0;
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int ThreadLocalAllocBuffer::_reserve_for_allocation_prefetch = 0;
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unsigned ThreadLocalAllocBuffer::_target_refills = 0;
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GlobalTLABStats* ThreadLocalAllocBuffer::_global_stats = NULL;
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void ThreadLocalAllocBuffer::clear_before_allocation() {
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_slow_refill_waste += (unsigned)remaining();
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make_parsable(true); // also retire the TLAB
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}
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size_t ThreadLocalAllocBuffer::_max_size = 0;
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int ThreadLocalAllocBuffer::_reserve_for_allocation_prefetch = 0;
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unsigned int ThreadLocalAllocBuffer::_target_refills = 0;
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size_t ThreadLocalAllocBuffer::remaining() {
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if (end() == NULL) {
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@ -53,22 +44,7 @@ size_t ThreadLocalAllocBuffer::remaining() {
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return pointer_delta(hard_end(), top());
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}
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void ThreadLocalAllocBuffer::accumulate_statistics_before_gc() {
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global_stats()->initialize();
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for (JavaThreadIteratorWithHandle jtiwh; JavaThread *thread = jtiwh.next(); ) {
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thread->tlab().accumulate_statistics();
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thread->tlab().initialize_statistics();
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}
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// Publish new stats if some allocation occurred.
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if (global_stats()->allocation() != 0) {
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global_stats()->publish();
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global_stats()->print();
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}
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}
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void ThreadLocalAllocBuffer::accumulate_statistics() {
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void ThreadLocalAllocBuffer::accumulate_and_reset_statistics(ThreadLocalAllocStats* stats) {
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Thread* thr = thread();
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size_t capacity = Universe::heap()->tlab_capacity(thr);
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size_t used = Universe::heap()->tlab_used(thr);
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@ -95,47 +71,55 @@ void ThreadLocalAllocBuffer::accumulate_statistics() {
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double alloc_frac = MIN2(1.0, (double) allocated_since_last_gc / used);
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_allocation_fraction.sample(alloc_frac);
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}
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global_stats()->update_allocating_threads();
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global_stats()->update_number_of_refills(_number_of_refills);
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global_stats()->update_allocation(_allocated_size);
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global_stats()->update_gc_waste(_gc_waste);
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global_stats()->update_slow_refill_waste(_slow_refill_waste);
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global_stats()->update_fast_refill_waste(_fast_refill_waste);
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stats->update_fast_allocations(_number_of_refills,
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_allocated_size,
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_gc_waste,
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_fast_refill_waste,
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_slow_refill_waste);
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} else {
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assert(_number_of_refills == 0 && _fast_refill_waste == 0 &&
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_slow_refill_waste == 0 && _gc_waste == 0,
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"tlab stats == 0");
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}
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global_stats()->update_slow_allocations(_slow_allocations);
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stats->update_slow_allocations(_slow_allocations);
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reset_statistics();
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}
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// Fills the current tlab with a dummy filler array to create
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// an illusion of a contiguous Eden and optionally retires the tlab.
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// Waste accounting should be done in caller as appropriate; see,
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// for example, clear_before_allocation().
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void ThreadLocalAllocBuffer::make_parsable(bool retire, bool zap) {
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void ThreadLocalAllocBuffer::insert_filler() {
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assert(end() != NULL, "Must not be retired");
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Universe::heap()->fill_with_dummy_object(top(), hard_end(), true);
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}
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void ThreadLocalAllocBuffer::make_parsable() {
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if (end() != NULL) {
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invariants();
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if (retire) {
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thread()->incr_allocated_bytes(used_bytes());
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}
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Universe::heap()->fill_with_dummy_object(top(), hard_end(), retire && zap);
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if (retire || ZeroTLAB) { // "Reset" the TLAB
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set_start(NULL);
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set_top(NULL);
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set_pf_top(NULL);
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set_end(NULL);
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set_allocation_end(NULL);
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if (ZeroTLAB) {
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retire();
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} else {
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insert_filler();
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}
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}
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assert(!(retire || ZeroTLAB) ||
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(start() == NULL && end() == NULL && top() == NULL &&
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_allocation_end == NULL),
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"TLAB must be reset");
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}
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void ThreadLocalAllocBuffer::retire(ThreadLocalAllocStats* stats) {
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if (stats != NULL) {
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accumulate_and_reset_statistics(stats);
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}
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if (end() != NULL) {
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invariants();
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thread()->incr_allocated_bytes(used_bytes());
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insert_filler();
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initialize(NULL, NULL, NULL);
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}
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}
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void ThreadLocalAllocBuffer::retire_before_allocation() {
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_slow_refill_waste += (unsigned int)remaining();
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retire();
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}
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void ThreadLocalAllocBuffer::resize() {
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@ -158,7 +142,7 @@ void ThreadLocalAllocBuffer::resize() {
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set_refill_waste_limit(initial_refill_waste_limit());
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}
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void ThreadLocalAllocBuffer::initialize_statistics() {
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void ThreadLocalAllocBuffer::reset_statistics() {
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_number_of_refills = 0;
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_fast_refill_waste = 0;
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_slow_refill_waste = 0;
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@ -199,21 +183,17 @@ void ThreadLocalAllocBuffer::initialize() {
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set_desired_size(initial_desired_size());
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// Following check is needed because at startup the main
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// thread is initialized before the heap is. The initialization for
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// this thread is redone in startup_initialization below.
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if (Universe::heap() != NULL) {
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size_t capacity = Universe::heap()->tlab_capacity(thread()) / HeapWordSize;
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double alloc_frac = desired_size() * target_refills() / (double) capacity;
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_allocation_fraction.sample(alloc_frac);
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}
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size_t capacity = Universe::heap()->tlab_capacity(thread()) / HeapWordSize;
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double alloc_frac = desired_size() * target_refills() / (double) capacity;
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_allocation_fraction.sample(alloc_frac);
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set_refill_waste_limit(initial_refill_waste_limit());
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initialize_statistics();
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reset_statistics();
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}
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void ThreadLocalAllocBuffer::startup_initialization() {
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ThreadLocalAllocStats::initialize();
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// Assuming each thread's active tlab is, on average,
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// 1/2 full at a GC
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@ -222,8 +202,6 @@ void ThreadLocalAllocBuffer::startup_initialization() {
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// abort during VM initialization.
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_target_refills = MAX2(_target_refills, 2U);
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_global_stats = new GlobalTLABStats();
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#ifdef COMPILER2
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// If the C2 compiler is present, extra space is needed at the end of
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// TLABs, otherwise prefetching instructions generated by the C2
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@ -262,9 +240,9 @@ size_t ThreadLocalAllocBuffer::initial_desired_size() {
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if (TLABSize > 0) {
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init_sz = TLABSize / HeapWordSize;
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} else if (global_stats() != NULL) {
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} else {
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// Initial size is a function of the average number of allocating threads.
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unsigned nof_threads = global_stats()->allocating_threads_avg();
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unsigned int nof_threads = ThreadLocalAllocStats::allocating_threads_avg();
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init_sz = (Universe::heap()->tlab_capacity(thread()) / HeapWordSize) /
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(nof_threads * target_refills());
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@ -338,123 +316,148 @@ HeapWord* ThreadLocalAllocBuffer::hard_end() {
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return _allocation_end + alignment_reserve();
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}
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GlobalTLABStats::GlobalTLABStats() :
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_allocating_threads_avg(TLABAllocationWeight) {
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PerfVariable* ThreadLocalAllocStats::_perf_allocating_threads;
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PerfVariable* ThreadLocalAllocStats::_perf_total_refills;
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PerfVariable* ThreadLocalAllocStats::_perf_max_refills;
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PerfVariable* ThreadLocalAllocStats::_perf_total_allocations;
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PerfVariable* ThreadLocalAllocStats::_perf_total_gc_waste;
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PerfVariable* ThreadLocalAllocStats::_perf_max_gc_waste;
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PerfVariable* ThreadLocalAllocStats::_perf_total_slow_refill_waste;
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PerfVariable* ThreadLocalAllocStats::_perf_max_slow_refill_waste;
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PerfVariable* ThreadLocalAllocStats::_perf_total_fast_refill_waste;
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PerfVariable* ThreadLocalAllocStats::_perf_max_fast_refill_waste;
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PerfVariable* ThreadLocalAllocStats::_perf_total_slow_allocations;
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PerfVariable* ThreadLocalAllocStats::_perf_max_slow_allocations;
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AdaptiveWeightedAverage ThreadLocalAllocStats::_allocating_threads_avg(0);
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initialize();
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static PerfVariable* create_perf_variable(const char* name, PerfData::Units unit, TRAPS) {
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ResourceMark rm;
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return PerfDataManager::create_variable(SUN_GC, PerfDataManager::counter_name("tlab", name), unit, THREAD);
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}
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void ThreadLocalAllocStats::initialize() {
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_allocating_threads_avg = AdaptiveWeightedAverage(TLABAllocationWeight);
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_allocating_threads_avg.sample(1); // One allocating thread at startup
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if (UsePerfData) {
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EXCEPTION_MARK;
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ResourceMark rm;
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char* cname = PerfDataManager::counter_name("tlab", "allocThreads");
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_perf_allocating_threads =
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PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK);
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cname = PerfDataManager::counter_name("tlab", "fills");
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_perf_total_refills =
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PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK);
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cname = PerfDataManager::counter_name("tlab", "maxFills");
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_perf_max_refills =
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PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK);
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cname = PerfDataManager::counter_name("tlab", "alloc");
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_perf_allocation =
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PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
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cname = PerfDataManager::counter_name("tlab", "gcWaste");
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_perf_gc_waste =
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PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
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cname = PerfDataManager::counter_name("tlab", "maxGcWaste");
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_perf_max_gc_waste =
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PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
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cname = PerfDataManager::counter_name("tlab", "slowWaste");
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_perf_slow_refill_waste =
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PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
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cname = PerfDataManager::counter_name("tlab", "maxSlowWaste");
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_perf_max_slow_refill_waste =
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PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
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cname = PerfDataManager::counter_name("tlab", "fastWaste");
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_perf_fast_refill_waste =
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PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
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cname = PerfDataManager::counter_name("tlab", "maxFastWaste");
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_perf_max_fast_refill_waste =
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PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
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cname = PerfDataManager::counter_name("tlab", "slowAlloc");
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_perf_slow_allocations =
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PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK);
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cname = PerfDataManager::counter_name("tlab", "maxSlowAlloc");
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_perf_max_slow_allocations =
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PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK);
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_perf_allocating_threads = create_perf_variable("allocThreads", PerfData::U_None, CHECK);
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_perf_total_refills = create_perf_variable("fills", PerfData::U_None, CHECK);
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_perf_max_refills = create_perf_variable("maxFills", PerfData::U_None, CHECK);
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_perf_total_allocations = create_perf_variable("alloc", PerfData::U_Bytes, CHECK);
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_perf_total_gc_waste = create_perf_variable("gcWaste", PerfData::U_Bytes, CHECK);
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_perf_max_gc_waste = create_perf_variable("maxGcWaste", PerfData::U_Bytes, CHECK);
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_perf_total_slow_refill_waste = create_perf_variable("slowWaste", PerfData::U_Bytes, CHECK);
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_perf_max_slow_refill_waste = create_perf_variable("maxSlowWaste", PerfData::U_Bytes, CHECK);
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_perf_total_fast_refill_waste = create_perf_variable("fastWaste", PerfData::U_Bytes, CHECK);
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_perf_max_fast_refill_waste = create_perf_variable("maxFastWaste", PerfData::U_Bytes, CHECK);
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_perf_total_slow_allocations = create_perf_variable("slowAlloc", PerfData::U_None, CHECK);
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_perf_max_slow_allocations = create_perf_variable("maxSlowAlloc", PerfData::U_None, CHECK);
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}
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}
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void GlobalTLABStats::initialize() {
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// Clear counters summarizing info from all threads
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ThreadLocalAllocStats::ThreadLocalAllocStats() :
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_allocating_threads(0),
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_total_refills(0),
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_max_refills(0),
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_total_allocations(0),
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_total_gc_waste(0),
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_max_gc_waste(0),
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_total_fast_refill_waste(0),
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_max_fast_refill_waste(0),
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_total_slow_refill_waste(0),
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_max_slow_refill_waste(0),
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_total_slow_allocations(0),
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_max_slow_allocations(0) {}
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unsigned int ThreadLocalAllocStats::allocating_threads_avg() {
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return MAX2((unsigned int)(_allocating_threads_avg.average() + 0.5), 1U);
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}
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void ThreadLocalAllocStats::update_fast_allocations(unsigned int refills,
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size_t allocations,
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size_t gc_waste,
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size_t fast_refill_waste,
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size_t slow_refill_waste) {
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_allocating_threads += 1;
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_total_refills += refills;
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_max_refills = MAX2(_max_refills, refills);
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_total_allocations += allocations;
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_total_gc_waste += gc_waste;
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_max_gc_waste = MAX2(_max_gc_waste, gc_waste);
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_total_fast_refill_waste += fast_refill_waste;
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_max_fast_refill_waste = MAX2(_max_fast_refill_waste, fast_refill_waste);
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_total_slow_refill_waste += slow_refill_waste;
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_max_slow_refill_waste = MAX2(_max_slow_refill_waste, slow_refill_waste);
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}
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void ThreadLocalAllocStats::update_slow_allocations(unsigned int allocations) {
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_total_slow_allocations += allocations;
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_max_slow_allocations = MAX2(_max_slow_allocations, allocations);
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}
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void ThreadLocalAllocStats::update(const ThreadLocalAllocStats& other) {
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_allocating_threads += other._allocating_threads;
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_total_refills += other._total_refills;
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_max_refills = MAX2(_max_refills, other._max_refills);
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_total_allocations += other._total_allocations;
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_total_gc_waste += other._total_gc_waste;
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_max_gc_waste = MAX2(_max_gc_waste, other._max_gc_waste);
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_total_fast_refill_waste += other._total_fast_refill_waste;
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_max_fast_refill_waste = MAX2(_max_fast_refill_waste, other._max_fast_refill_waste);
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_total_slow_refill_waste += other._total_slow_refill_waste;
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_max_slow_refill_waste = MAX2(_max_slow_refill_waste, other._max_slow_refill_waste);
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_total_slow_allocations += other._total_slow_allocations;
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_max_slow_allocations = MAX2(_max_slow_allocations, other._max_slow_allocations);
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}
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void ThreadLocalAllocStats::reset() {
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_allocating_threads = 0;
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_total_refills = 0;
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_max_refills = 0;
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_total_allocation = 0;
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_total_allocations = 0;
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_total_gc_waste = 0;
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_max_gc_waste = 0;
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_total_slow_refill_waste = 0;
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_max_slow_refill_waste = 0;
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_total_fast_refill_waste = 0;
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_max_fast_refill_waste = 0;
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_total_slow_refill_waste = 0;
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_max_slow_refill_waste = 0;
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_total_slow_allocations = 0;
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_max_slow_allocations = 0;
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}
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void GlobalTLABStats::publish() {
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_allocating_threads_avg.sample(_allocating_threads);
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if (UsePerfData) {
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_perf_allocating_threads ->set_value(_allocating_threads);
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_perf_total_refills ->set_value(_total_refills);
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_perf_max_refills ->set_value(_max_refills);
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_perf_allocation ->set_value(_total_allocation);
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_perf_gc_waste ->set_value(_total_gc_waste);
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_perf_max_gc_waste ->set_value(_max_gc_waste);
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_perf_slow_refill_waste ->set_value(_total_slow_refill_waste);
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_perf_max_slow_refill_waste->set_value(_max_slow_refill_waste);
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_perf_fast_refill_waste ->set_value(_total_fast_refill_waste);
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_perf_max_fast_refill_waste->set_value(_max_fast_refill_waste);
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_perf_slow_allocations ->set_value(_total_slow_allocations);
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_perf_max_slow_allocations ->set_value(_max_slow_allocations);
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}
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}
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void GlobalTLABStats::print() {
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Log(gc, tlab) log;
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if (!log.is_debug()) {
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void ThreadLocalAllocStats::publish() {
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if (_total_allocations == 0) {
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return;
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}
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size_t waste = _total_gc_waste + _total_slow_refill_waste + _total_fast_refill_waste;
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double waste_percent = percent_of(waste, _total_allocation);
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log.debug("TLAB totals: thrds: %d refills: %d max: %d"
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" slow allocs: %d max %d waste: %4.1f%%"
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||||
" gc: " SIZE_FORMAT "B max: " SIZE_FORMAT "B"
|
||||
" slow: " SIZE_FORMAT "B max: " SIZE_FORMAT "B"
|
||||
" fast: " SIZE_FORMAT "B max: " SIZE_FORMAT "B",
|
||||
_allocating_threads,
|
||||
_total_refills, _max_refills,
|
||||
_total_slow_allocations, _max_slow_allocations,
|
||||
waste_percent,
|
||||
_total_gc_waste * HeapWordSize,
|
||||
_max_gc_waste * HeapWordSize,
|
||||
_total_slow_refill_waste * HeapWordSize,
|
||||
_max_slow_refill_waste * HeapWordSize,
|
||||
_total_fast_refill_waste * HeapWordSize,
|
||||
_max_fast_refill_waste * HeapWordSize);
|
||||
_allocating_threads_avg.sample(_allocating_threads);
|
||||
|
||||
const size_t waste = _total_gc_waste + _total_slow_refill_waste + _total_fast_refill_waste;
|
||||
const double waste_percent = percent_of(waste, _total_allocations);
|
||||
log_debug(gc, tlab)("TLAB totals: thrds: %d refills: %d max: %d"
|
||||
" slow allocs: %d max %d waste: %4.1f%%"
|
||||
" gc: " SIZE_FORMAT "B max: " SIZE_FORMAT "B"
|
||||
" slow: " SIZE_FORMAT "B max: " SIZE_FORMAT "B"
|
||||
" fast: " SIZE_FORMAT "B max: " SIZE_FORMAT "B",
|
||||
_allocating_threads, _total_refills, _max_refills,
|
||||
_total_slow_allocations, _max_slow_allocations, waste_percent,
|
||||
_total_gc_waste * HeapWordSize, _max_gc_waste * HeapWordSize,
|
||||
_total_slow_refill_waste * HeapWordSize, _max_slow_refill_waste * HeapWordSize,
|
||||
_total_fast_refill_waste * HeapWordSize, _max_fast_refill_waste * HeapWordSize);
|
||||
|
||||
if (UsePerfData) {
|
||||
_perf_allocating_threads ->set_value(_allocating_threads);
|
||||
_perf_total_refills ->set_value(_total_refills);
|
||||
_perf_max_refills ->set_value(_max_refills);
|
||||
_perf_total_allocations ->set_value(_total_allocations);
|
||||
_perf_total_gc_waste ->set_value(_total_gc_waste);
|
||||
_perf_max_gc_waste ->set_value(_max_gc_waste);
|
||||
_perf_total_slow_refill_waste ->set_value(_total_slow_refill_waste);
|
||||
_perf_max_slow_refill_waste ->set_value(_max_slow_refill_waste);
|
||||
_perf_total_fast_refill_waste ->set_value(_total_fast_refill_waste);
|
||||
_perf_max_fast_refill_waste ->set_value(_max_fast_refill_waste);
|
||||
_perf_total_slow_allocations ->set_value(_total_slow_allocations);
|
||||
_perf_max_slow_allocations ->set_value(_max_slow_allocations);
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue