Mercurial > hg > truffle
view src/share/vm/runtime/handles.cpp @ 10246:194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
Summary: Refactor G1's hot card cache and card counts table into their own files. Simplify the card counts table, including removing the encoding of the card index in each entry. The card counts table now has a 1:1 correspondence with the cards spanned by heap. Space for the card counts table is reserved from virtual memory (rather than C heap) during JVM startup and is committed/expanded when the heap is expanded. Changes were also reviewed-by Vitaly Davidovich.
Reviewed-by: tschatzl, jmasa
author | johnc |
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date | Thu, 09 May 2013 11:16:39 -0700 |
parents | f34d701e952e |
children | f9be75d21404 |
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/* * Copyright (c) 1997, 2012, 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 "memory/allocation.inline.hpp" #include "oops/constantPool.hpp" #include "oops/oop.inline.hpp" #include "runtime/handles.inline.hpp" #include "runtime/thread.inline.hpp" #ifdef TARGET_OS_FAMILY_linux # include "os_linux.inline.hpp" #endif #ifdef TARGET_OS_FAMILY_solaris # include "os_solaris.inline.hpp" #endif #ifdef TARGET_OS_FAMILY_windows # include "os_windows.inline.hpp" #endif #ifdef TARGET_OS_FAMILY_bsd # include "os_bsd.inline.hpp" #endif #ifdef ASSERT oop* HandleArea::allocate_handle(oop obj) { assert(_handle_mark_nesting > 1, "memory leak: allocating handle outside HandleMark"); assert(_no_handle_mark_nesting == 0, "allocating handle inside NoHandleMark"); assert(obj->is_oop(), "sanity check"); return real_allocate_handle(obj); } Handle::Handle(Thread* thread, oop obj) { assert(thread == Thread::current(), "sanity check"); if (obj == NULL) { _handle = NULL; } else { _handle = thread->handle_area()->allocate_handle(obj); } } #endif static uintx chunk_oops_do(OopClosure* f, Chunk* chunk, char* chunk_top) { oop* bottom = (oop*) chunk->bottom(); oop* top = (oop*) chunk_top; uintx handles_visited = top - bottom; assert(top >= bottom && top <= (oop*) chunk->top(), "just checking"); // during GC phase 3, a handle may be a forward pointer that // is not yet valid, so loosen the assertion while (bottom < top) { // This test can be moved up but for now check every oop. assert((*bottom)->is_oop(), "handle should point to oop"); f->do_oop(bottom++); } return handles_visited; } // Used for debugging handle allocation. NOT_PRODUCT(jint _nof_handlemarks = 0;) void HandleArea::oops_do(OopClosure* f) { uintx handles_visited = 0; // First handle the current chunk. It is filled to the high water mark. handles_visited += chunk_oops_do(f, _chunk, _hwm); // Then handle all previous chunks. They are completely filled. Chunk* k = _first; while(k != _chunk) { handles_visited += chunk_oops_do(f, k, k->top()); k = k->next(); } // The thread local handle areas should not get very large if (TraceHandleAllocation && handles_visited > TotalHandleAllocationLimit) { #ifdef ASSERT warning("%d: Visited in HandleMark : %d", _nof_handlemarks, handles_visited); #else warning("Visited in HandleMark : %d", handles_visited); #endif } if (_prev != NULL) _prev->oops_do(f); } void HandleMark::initialize(Thread* thread) { _thread = thread; // Save area _area = thread->handle_area(); // Save current top _chunk = _area->_chunk; _hwm = _area->_hwm; _max = _area->_max; _size_in_bytes = _area->_size_in_bytes; debug_only(_area->_handle_mark_nesting++); assert(_area->_handle_mark_nesting > 0, "must stack allocate HandleMarks"); debug_only(Atomic::inc(&_nof_handlemarks);) // Link this in the thread set_previous_handle_mark(thread->last_handle_mark()); thread->set_last_handle_mark(this); } HandleMark::~HandleMark() { HandleArea* area = _area; // help compilers with poor alias analysis assert(area == _thread->handle_area(), "sanity check"); assert(area->_handle_mark_nesting > 0, "must stack allocate HandleMarks" ); debug_only(area->_handle_mark_nesting--); // Debug code to trace the number of handles allocated per mark/ #ifdef ASSERT if (TraceHandleAllocation) { size_t handles = 0; Chunk *c = _chunk->next(); if (c == NULL) { handles = area->_hwm - _hwm; // no new chunk allocated } else { handles = _max - _hwm; // add rest in first chunk while(c != NULL) { handles += c->length(); c = c->next(); } handles -= area->_max - area->_hwm; // adjust for last trunk not full } handles /= sizeof(void *); // Adjust for size of a handle if (handles > HandleAllocationLimit) { // Note: _nof_handlemarks is only set in debug mode warning("%d: Allocated in HandleMark : %d", _nof_handlemarks, handles); } tty->print_cr("Handles %d", handles); } #endif // Delete later chunks if( _chunk->next() ) { // reset arena size before delete chunks. Otherwise, the total // arena size could exceed total chunk size assert(area->size_in_bytes() > size_in_bytes(), "Sanity check"); area->set_size_in_bytes(size_in_bytes()); _chunk->next_chop(); } else { assert(area->size_in_bytes() == size_in_bytes(), "Sanity check"); } // Roll back arena to saved top markers area->_chunk = _chunk; area->_hwm = _hwm; area->_max = _max; #ifdef ASSERT // clear out first chunk (to detect allocation bugs) if (ZapVMHandleArea) { memset(_hwm, badHandleValue, _max - _hwm); } Atomic::dec(&_nof_handlemarks); #endif // Unlink this from the thread _thread->set_last_handle_mark(previous_handle_mark()); } #ifdef ASSERT NoHandleMark::NoHandleMark() { HandleArea* area = Thread::current()->handle_area(); area->_no_handle_mark_nesting++; assert(area->_no_handle_mark_nesting > 0, "must stack allocate NoHandleMark" ); } NoHandleMark::~NoHandleMark() { HandleArea* area = Thread::current()->handle_area(); assert(area->_no_handle_mark_nesting > 0, "must stack allocate NoHandleMark" ); area->_no_handle_mark_nesting--; } ResetNoHandleMark::ResetNoHandleMark() { HandleArea* area = Thread::current()->handle_area(); _no_handle_mark_nesting = area->_no_handle_mark_nesting; area->_no_handle_mark_nesting = 0; } ResetNoHandleMark::~ResetNoHandleMark() { HandleArea* area = Thread::current()->handle_area(); area->_no_handle_mark_nesting = _no_handle_mark_nesting; } #endif