author | jprovino |
Thu, 03 Mar 2016 12:20:22 -0500 | |
changeset 36402 | 7c20aae43c41 |
parent 36378 | d63bca5c1439 |
child 37039 | 79f62b89a7a6 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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|
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#include "precompiled.hpp" |
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#include "gc/g1/g1CollectedHeap.inline.hpp" |
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#include "gc/g1/g1CollectorPolicy.hpp" |
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#include "gc/g1/g1YoungRemSetSamplingThread.hpp" |
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#include "gc/g1/heapRegion.inline.hpp" |
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#include "gc/g1/heapRegionRemSet.hpp" |
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#include "gc/g1/suspendibleThreadSet.hpp" |
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#include "runtime/mutexLocker.hpp" |
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void G1YoungRemSetSamplingThread::run() { |
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initialize_in_thread(); |
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wait_for_universe_init(); |
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run_service(); |
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|
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terminate(); |
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} |
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void G1YoungRemSetSamplingThread::stop() { |
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// it is ok to take late safepoints here, if needed |
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{ |
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MutexLockerEx mu(Terminator_lock); |
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_should_terminate = true; |
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} |
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stop_service(); |
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{ |
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MutexLockerEx mu(Terminator_lock); |
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while (!_has_terminated) { |
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Terminator_lock->wait(); |
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} |
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} |
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} |
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G1YoungRemSetSamplingThread::G1YoungRemSetSamplingThread() : |
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ConcurrentGCThread(), |
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_monitor(Mutex::nonleaf, |
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"G1YoungRemSetSamplingThread monitor", |
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true, |
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Monitor::_safepoint_check_never) { |
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set_name("G1 Young RemSet Sampling"); |
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create_and_start(); |
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} |
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void G1YoungRemSetSamplingThread::sleep_before_next_cycle() { |
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MutexLockerEx x(&_monitor, Mutex::_no_safepoint_check_flag); |
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if (!_should_terminate) { |
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uintx waitms = G1ConcRefinementServiceIntervalMillis; // 300, really should be? |
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_monitor.wait(Mutex::_no_safepoint_check_flag, waitms); |
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} |
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} |
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void G1YoungRemSetSamplingThread::run_service() { |
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double vtime_start = os::elapsedVTime(); |
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while (!_should_terminate) { |
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sample_young_list_rs_lengths(); |
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if (os::supports_vtime()) { |
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_vtime_accum = (os::elapsedVTime() - vtime_start); |
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} else { |
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_vtime_accum = 0.0; |
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} |
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sleep_before_next_cycle(); |
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} |
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} |
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void G1YoungRemSetSamplingThread::stop_service() { |
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MutexLockerEx x(&_monitor, Mutex::_no_safepoint_check_flag); |
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_monitor.notify(); |
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} |
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void G1YoungRemSetSamplingThread::sample_young_list_rs_lengths() { |
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SuspendibleThreadSetJoiner sts; |
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G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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G1CollectorPolicy* g1p = g1h->g1_policy(); |
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if (g1p->adaptive_young_list_length()) { |
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int regions_visited = 0; |
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HeapRegion* hr = g1h->young_list()->first_region(); |
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size_t sampled_rs_lengths = 0; |
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|
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while (hr != NULL) { |
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size_t rs_length = hr->rem_set()->occupied(); |
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sampled_rs_lengths += rs_length; |
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// The current region may not yet have been added to the |
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// incremental collection set (it gets added when it is |
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// retired as the current allocation region). |
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if (hr->in_collection_set()) { |
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// Update the collection set policy information for this region |
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g1p->update_incremental_cset_info(hr, rs_length); |
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} |
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++regions_visited; |
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// we try to yield every time we visit 10 regions |
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if (regions_visited == 10) { |
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if (sts.should_yield()) { |
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sts.yield(); |
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// A gc may have occurred and our sampling data is stale and further |
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// traversal of the young list is unsafe |
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|
128 |
return; |
33608
7afc768e4d62
8138920: Refactor the sampling thread from ConcurrentG1RefineThread
drwhite
parents:
diff
changeset
|
129 |
} |
7afc768e4d62
8138920: Refactor the sampling thread from ConcurrentG1RefineThread
drwhite
parents:
diff
changeset
|
130 |
regions_visited = 0; |
7afc768e4d62
8138920: Refactor the sampling thread from ConcurrentG1RefineThread
drwhite
parents:
diff
changeset
|
131 |
} |
36365
bcc9c9afda49
8150390: Move rs length sampling data to the sampling thread
mgerdin
parents:
35916
diff
changeset
|
132 |
hr = hr->get_next_young_region(); |
33608
7afc768e4d62
8138920: Refactor the sampling thread from ConcurrentG1RefineThread
drwhite
parents:
diff
changeset
|
133 |
} |
36365
bcc9c9afda49
8150390: Move rs length sampling data to the sampling thread
mgerdin
parents:
35916
diff
changeset
|
134 |
g1p->revise_young_list_target_length_if_necessary(sampled_rs_lengths); |
33608
7afc768e4d62
8138920: Refactor the sampling thread from ConcurrentG1RefineThread
drwhite
parents:
diff
changeset
|
135 |
} |
7afc768e4d62
8138920: Refactor the sampling thread from ConcurrentG1RefineThread
drwhite
parents:
diff
changeset
|
136 |
} |