--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/g1/g1MonitoringSupport.cpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,274 @@
+/*
+ * Copyright (c) 2011, 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "gc/g1/g1CollectedHeap.inline.hpp"
+#include "gc/g1/g1MonitoringSupport.hpp"
+#include "gc/g1/g1Policy.hpp"
+
+G1GenerationCounters::G1GenerationCounters(G1MonitoringSupport* g1mm,
+ const char* name,
+ int ordinal, int spaces,
+ size_t min_capacity,
+ size_t max_capacity,
+ size_t curr_capacity)
+ : GenerationCounters(name, ordinal, spaces, min_capacity,
+ max_capacity, curr_capacity), _g1mm(g1mm) { }
+
+// We pad the capacity three times given that the young generation
+// contains three spaces (eden and two survivors).
+G1YoungGenerationCounters::G1YoungGenerationCounters(G1MonitoringSupport* g1mm,
+ const char* name)
+ : G1GenerationCounters(g1mm, name, 0 /* ordinal */, 3 /* spaces */,
+ G1MonitoringSupport::pad_capacity(0, 3) /* min_capacity */,
+ G1MonitoringSupport::pad_capacity(g1mm->young_gen_max(), 3),
+ G1MonitoringSupport::pad_capacity(0, 3) /* curr_capacity */) {
+ if (UsePerfData) {
+ update_all();
+ }
+}
+
+G1OldGenerationCounters::G1OldGenerationCounters(G1MonitoringSupport* g1mm,
+ const char* name)
+ : G1GenerationCounters(g1mm, name, 1 /* ordinal */, 1 /* spaces */,
+ G1MonitoringSupport::pad_capacity(0) /* min_capacity */,
+ G1MonitoringSupport::pad_capacity(g1mm->old_gen_max()),
+ G1MonitoringSupport::pad_capacity(0) /* curr_capacity */) {
+ if (UsePerfData) {
+ update_all();
+ }
+}
+
+void G1YoungGenerationCounters::update_all() {
+ size_t committed =
+ G1MonitoringSupport::pad_capacity(_g1mm->young_gen_committed(), 3);
+ _current_size->set_value(committed);
+}
+
+void G1OldGenerationCounters::update_all() {
+ size_t committed =
+ G1MonitoringSupport::pad_capacity(_g1mm->old_gen_committed());
+ _current_size->set_value(committed);
+}
+
+G1MonitoringSupport::G1MonitoringSupport(G1CollectedHeap* g1h) :
+ _g1h(g1h),
+ _incremental_collection_counters(NULL),
+ _full_collection_counters(NULL),
+ _old_collection_counters(NULL),
+ _old_space_counters(NULL),
+ _young_collection_counters(NULL),
+ _eden_counters(NULL),
+ _from_counters(NULL),
+ _to_counters(NULL),
+
+ _overall_reserved(0),
+ _overall_committed(0), _overall_used(0),
+ _young_region_num(0),
+ _young_gen_committed(0),
+ _eden_committed(0), _eden_used(0),
+ _survivor_committed(0), _survivor_used(0),
+ _old_committed(0), _old_used(0) {
+
+ _overall_reserved = g1h->max_capacity();
+ recalculate_sizes();
+
+ // Counters for GC collections
+ //
+ // name "collector.0". In a generational collector this would be the
+ // young generation collection.
+ _incremental_collection_counters =
+ new CollectorCounters("G1 incremental collections", 0);
+ // name "collector.1". In a generational collector this would be the
+ // old generation collection.
+ _full_collection_counters =
+ new CollectorCounters("G1 stop-the-world full collections", 1);
+
+ // timer sampling for all counters supporting sampling only update the
+ // used value. See the take_sample() method. G1 requires both used and
+ // capacity updated so sampling is not currently used. It might
+ // be sufficient to update all counters in take_sample() even though
+ // take_sample() only returns "used". When sampling was used, there
+ // were some anomolous values emitted which may have been the consequence
+ // of not updating all values simultaneously (i.e., see the calculation done
+ // in eden_space_used(), is it possible that the values used to
+ // calculate either eden_used or survivor_used are being updated by
+ // the collector when the sample is being done?).
+ const bool sampled = false;
+
+ // "Generation" and "Space" counters.
+ //
+ // name "generation.1" This is logically the old generation in
+ // generational GC terms. The "1, 1" parameters are for
+ // the n-th generation (=1) with 1 space.
+ // Counters are created from minCapacity, maxCapacity, and capacity
+ _old_collection_counters = new G1OldGenerationCounters(this, "old");
+
+ // name "generation.1.space.0"
+ // Counters are created from maxCapacity, capacity, initCapacity,
+ // and used.
+ _old_space_counters = new HSpaceCounters("space", 0 /* ordinal */,
+ pad_capacity(overall_reserved()) /* max_capacity */,
+ pad_capacity(old_space_committed()) /* init_capacity */,
+ _old_collection_counters);
+
+ // Young collection set
+ // name "generation.0". This is logically the young generation.
+ // The "0, 3" are parameters for the n-th generation (=0) with 3 spaces.
+ // See _old_collection_counters for additional counters
+ _young_collection_counters = new G1YoungGenerationCounters(this, "young");
+
+ // name "generation.0.space.0"
+ // See _old_space_counters for additional counters
+ _eden_counters = new HSpaceCounters("eden", 0 /* ordinal */,
+ pad_capacity(overall_reserved()) /* max_capacity */,
+ pad_capacity(eden_space_committed()) /* init_capacity */,
+ _young_collection_counters);
+
+ // name "generation.0.space.1"
+ // See _old_space_counters for additional counters
+ // Set the arguments to indicate that this survivor space is not used.
+ _from_counters = new HSpaceCounters("s0", 1 /* ordinal */,
+ pad_capacity(0) /* max_capacity */,
+ pad_capacity(0) /* init_capacity */,
+ _young_collection_counters);
+
+ // name "generation.0.space.2"
+ // See _old_space_counters for additional counters
+ _to_counters = new HSpaceCounters("s1", 2 /* ordinal */,
+ pad_capacity(overall_reserved()) /* max_capacity */,
+ pad_capacity(survivor_space_committed()) /* init_capacity */,
+ _young_collection_counters);
+
+ if (UsePerfData) {
+ // Given that this survivor space is not used, we update it here
+ // once to reflect that its used space is 0 so that we don't have to
+ // worry about updating it again later.
+ _from_counters->update_used(0);
+ }
+}
+
+void G1MonitoringSupport::recalculate_sizes() {
+ G1CollectedHeap* g1 = g1h();
+
+ // Recalculate all the sizes from scratch. We assume that this is
+ // called at a point where no concurrent updates to the various
+ // values we read here are possible (i.e., at a STW phase at the end
+ // of a GC).
+
+ uint young_list_length = g1->young_regions_count();
+ uint survivor_list_length = g1->survivor_regions_count();
+ assert(young_list_length >= survivor_list_length, "invariant");
+ uint eden_list_length = young_list_length - survivor_list_length;
+ // Max length includes any potential extensions to the young gen
+ // we'll do when the GC locker is active.
+ uint young_list_max_length = g1->g1_policy()->young_list_max_length();
+ assert(young_list_max_length >= survivor_list_length, "invariant");
+ uint eden_list_max_length = young_list_max_length - survivor_list_length;
+
+ _overall_used = g1->used_unlocked();
+ _eden_used = (size_t) eden_list_length * HeapRegion::GrainBytes;
+ _survivor_used = (size_t) survivor_list_length * HeapRegion::GrainBytes;
+ _young_region_num = young_list_length;
+ _old_used = subtract_up_to_zero(_overall_used, _eden_used + _survivor_used);
+
+ // First calculate the committed sizes that can be calculated independently.
+ _survivor_committed = _survivor_used;
+ _old_committed = HeapRegion::align_up_to_region_byte_size(_old_used);
+
+ // Next, start with the overall committed size.
+ _overall_committed = g1->capacity();
+ size_t committed = _overall_committed;
+
+ // Remove the committed size we have calculated so far (for the
+ // survivor and old space).
+ assert(committed >= (_survivor_committed + _old_committed), "sanity");
+ committed -= _survivor_committed + _old_committed;
+
+ // Next, calculate and remove the committed size for the eden.
+ _eden_committed = (size_t) eden_list_max_length * HeapRegion::GrainBytes;
+ // Somewhat defensive: be robust in case there are inaccuracies in
+ // the calculations
+ _eden_committed = MIN2(_eden_committed, committed);
+ committed -= _eden_committed;
+
+ // Finally, give the rest to the old space...
+ _old_committed += committed;
+ // ..and calculate the young gen committed.
+ _young_gen_committed = _eden_committed + _survivor_committed;
+
+ assert(_overall_committed ==
+ (_eden_committed + _survivor_committed + _old_committed),
+ "the committed sizes should add up");
+ // Somewhat defensive: cap the eden used size to make sure it
+ // never exceeds the committed size.
+ _eden_used = MIN2(_eden_used, _eden_committed);
+ // _survivor_committed and _old_committed are calculated in terms of
+ // the corresponding _*_used value, so the next two conditions
+ // should hold.
+ assert(_survivor_used <= _survivor_committed, "post-condition");
+ assert(_old_used <= _old_committed, "post-condition");
+}
+
+void G1MonitoringSupport::recalculate_eden_size() {
+ G1CollectedHeap* g1 = g1h();
+
+ // When a new eden region is allocated, only the eden_used size is
+ // affected (since we have recalculated everything else at the last GC).
+
+ uint young_region_num = g1h()->young_regions_count();
+ if (young_region_num > _young_region_num) {
+ uint diff = young_region_num - _young_region_num;
+ _eden_used += (size_t) diff * HeapRegion::GrainBytes;
+ // Somewhat defensive: cap the eden used size to make sure it
+ // never exceeds the committed size.
+ _eden_used = MIN2(_eden_used, _eden_committed);
+ _young_region_num = young_region_num;
+ }
+}
+
+void G1MonitoringSupport::update_sizes() {
+ recalculate_sizes();
+ if (UsePerfData) {
+ eden_counters()->update_capacity(pad_capacity(eden_space_committed()));
+ eden_counters()->update_used(eden_space_used());
+ // only the to survivor space (s1) is active, so we don't need to
+ // update the counters for the from survivor space (s0)
+ to_counters()->update_capacity(pad_capacity(survivor_space_committed()));
+ to_counters()->update_used(survivor_space_used());
+ old_space_counters()->update_capacity(pad_capacity(old_space_committed()));
+ old_space_counters()->update_used(old_space_used());
+ old_collection_counters()->update_all();
+ young_collection_counters()->update_all();
+ MetaspaceCounters::update_performance_counters();
+ CompressedClassSpaceCounters::update_performance_counters();
+ }
+}
+
+void G1MonitoringSupport::update_eden_size() {
+ recalculate_eden_size();
+ if (UsePerfData) {
+ eden_counters()->update_used(eden_space_used());
+ }
+}