author | dtitov |
Wed, 25 Sep 2019 11:10:05 -0700 | |
changeset 58340 | f4abe950c3b0 |
child 58504 | 94dd00d2da29 |
permissions | -rw-r--r-- |
58340
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/* |
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* Copyright (c) 2019, 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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#include "precompiled.hpp" |
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#include "runtime/interfaceSupport.inline.hpp" |
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#include "runtime/thread.hpp" |
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#include "runtime/threadSMR.hpp" |
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#include "runtime/timerTrace.hpp" |
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#include "services/threadIdTable.hpp" |
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#include "utilities/concurrentHashTable.inline.hpp" |
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#include "utilities/concurrentHashTableTasks.inline.hpp" |
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typedef ConcurrentHashTable<ThreadIdTableConfig, mtInternal> ThreadIdTableHash; |
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// 2^24 is max size |
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static const size_t END_SIZE = 24; |
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// Default initial size 256 |
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static const size_t DEFAULT_TABLE_SIZE_LOG = 8; |
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// Prefer short chains of avg 2 |
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static const double PREF_AVG_LIST_LEN = 2.0; |
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static ThreadIdTableHash* volatile _local_table = NULL; |
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static volatile size_t _current_size = 0; |
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static volatile size_t _items_count = 0; |
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volatile bool ThreadIdTable::_is_initialized = false; |
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class ThreadIdTableEntry : public CHeapObj<mtInternal> { |
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private: |
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jlong _tid; |
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JavaThread* _java_thread; |
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public: |
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ThreadIdTableEntry(jlong tid, JavaThread* java_thread) : |
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_tid(tid), _java_thread(java_thread) {} |
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jlong tid() const { return _tid; } |
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JavaThread* thread() const { return _java_thread; } |
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}; |
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class ThreadIdTableConfig : public AllStatic { |
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public: |
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typedef ThreadIdTableEntry* Value; |
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static uintx get_hash(Value const& value, bool* is_dead) { |
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jlong tid = value->tid(); |
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return primitive_hash(tid); |
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} |
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static void* allocate_node(size_t size, Value const& value) { |
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ThreadIdTable::item_added(); |
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return AllocateHeap(size, mtInternal); |
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} |
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static void free_node(void* memory, Value const& value) { |
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delete value; |
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FreeHeap(memory); |
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ThreadIdTable::item_removed(); |
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} |
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}; |
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static size_t ceil_log2(size_t val) { |
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size_t ret; |
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for (ret = 1; ((size_t)1 << ret) < val; ++ret); |
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return ret; |
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} |
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// Lazily creates the table and populates it with the given |
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// thread list |
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void ThreadIdTable::lazy_initialize(const ThreadsList *threads) { |
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if (!_is_initialized) { |
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{ |
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// There is no obvious benefits in allowing the thread table |
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// to be concurently populated during the initalization. |
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MutexLocker ml(ThreadIdTableCreate_lock); |
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if (_is_initialized) { |
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return; |
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} |
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create_table(threads->length()); |
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_is_initialized = true; |
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} |
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for (uint i = 0; i < threads->length(); i++) { |
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JavaThread* thread = threads->thread_at(i); |
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oop tobj = thread->threadObj(); |
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if (tobj != NULL) { |
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jlong java_tid = java_lang_Thread::thread_id(tobj); |
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MutexLocker ml(Threads_lock); |
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if (!thread->is_exiting()) { |
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// Must be inside the lock to ensure that we don't add a thread to the table |
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// that has just passed the removal point in ThreadsSMRSupport::remove_thread() |
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add_thread(java_tid, thread); |
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} |
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} |
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} |
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} |
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} |
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void ThreadIdTable::create_table(size_t size) { |
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assert(_local_table == NULL, "Thread table is already created"); |
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size_t size_log = ceil_log2(size); |
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size_t start_size_log = |
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size_log > DEFAULT_TABLE_SIZE_LOG ? size_log : DEFAULT_TABLE_SIZE_LOG; |
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_current_size = (size_t)1 << start_size_log; |
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_local_table = new ThreadIdTableHash(start_size_log, END_SIZE); |
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} |
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|
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void ThreadIdTable::item_added() { |
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Atomic::inc(&_items_count); |
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log_trace(thread, table) ("Thread entry added"); |
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} |
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|
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void ThreadIdTable::item_removed() { |
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Atomic::dec(&_items_count); |
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log_trace(thread, table) ("Thread entry removed"); |
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} |
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|
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double ThreadIdTable::get_load_factor() { |
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return ((double)_items_count) / _current_size; |
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} |
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|
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size_t ThreadIdTable::table_size() { |
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return (size_t)1 << _local_table->get_size_log2(Thread::current()); |
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} |
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|
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void ThreadIdTable::grow(JavaThread* jt) { |
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ThreadIdTableHash::GrowTask gt(_local_table); |
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if (!gt.prepare(jt)) { |
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return; |
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} |
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log_trace(thread, table)("Started to grow"); |
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TraceTime timer("Grow", TRACETIME_LOG(Debug, membername, table, perf)); |
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while (gt.do_task(jt)) { |
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gt.pause(jt); |
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{ |
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ThreadBlockInVM tbivm(jt); |
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} |
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gt.cont(jt); |
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} |
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gt.done(jt); |
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_current_size = table_size(); |
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log_info(thread, table)("Grown to size:" SIZE_FORMAT, _current_size); |
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} |
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|
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class ThreadIdTableLookup : public StackObj { |
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private: |
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jlong _tid; |
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uintx _hash; |
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public: |
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ThreadIdTableLookup(jlong tid) |
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: _tid(tid), _hash(primitive_hash(tid)) {} |
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uintx get_hash() const { |
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return _hash; |
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} |
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bool equals(ThreadIdTableEntry** value, bool* is_dead) { |
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bool equals = primitive_equals(_tid, (*value)->tid()); |
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if (!equals) { |
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return false; |
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} |
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return true; |
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179 |
} |
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}; |
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|
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class ThreadGet : public StackObj { |
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private: |
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JavaThread* _return; |
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public: |
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ThreadGet(): _return(NULL) {} |
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void operator()(ThreadIdTableEntry** val) { |
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_return = (*val)->thread(); |
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} |
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JavaThread* get_res_thread() { |
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return _return; |
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192 |
} |
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193 |
}; |
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194 |
|
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195 |
void ThreadIdTable::grow_if_required() { |
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assert(Thread::current()->is_Java_thread(),"Must be Java thread"); |
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assert(_is_initialized, "Thread table is not initialized"); |
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double load_factor = get_load_factor(); |
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log_debug(thread, table)("Concurrent work, load factor: %g", load_factor); |
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if (load_factor > PREF_AVG_LIST_LEN && !_local_table->is_max_size_reached()) { |
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grow(JavaThread::current()); |
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} |
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203 |
} |
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204 |
|
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205 |
JavaThread* ThreadIdTable::add_thread(jlong tid, JavaThread* java_thread) { |
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assert(_is_initialized, "Thread table is not initialized"); |
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Thread* thread = Thread::current(); |
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ThreadIdTableLookup lookup(tid); |
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ThreadGet tg; |
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while (true) { |
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if (_local_table->get(thread, lookup, tg)) { |
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return tg.get_res_thread(); |
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} |
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ThreadIdTableEntry* entry = new ThreadIdTableEntry(tid, java_thread); |
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// The hash table takes ownership of the ThreadTableEntry, |
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// even if it's not inserted. |
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if (_local_table->insert(thread, lookup, entry)) { |
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grow_if_required(); |
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return java_thread; |
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} |
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} |
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} |
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|
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JavaThread* ThreadIdTable::find_thread_by_tid(jlong tid) { |
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assert(_is_initialized, "Thread table is not initialized"); |
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Thread* thread = Thread::current(); |
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ThreadIdTableLookup lookup(tid); |
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ThreadGet tg; |
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_local_table->get(thread, lookup, tg); |
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return tg.get_res_thread(); |
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} |
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|
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bool ThreadIdTable::remove_thread(jlong tid) { |
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assert(_is_initialized, "Thread table is not initialized"); |
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Thread* thread = Thread::current(); |
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8185005: Improve performance of ThreadMXBean.getThreadInfo(long ids[], int maxDepth)
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ThreadIdTableLookup lookup(tid); |
f4abe950c3b0
8185005: Improve performance of ThreadMXBean.getThreadInfo(long ids[], int maxDepth)
dtitov
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changeset
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237 |
return _local_table->remove(thread, lookup); |
f4abe950c3b0
8185005: Improve performance of ThreadMXBean.getThreadInfo(long ids[], int maxDepth)
dtitov
parents:
diff
changeset
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238 |
} |