author | jwilhelm |
Thu, 03 Oct 2013 21:36:29 +0200 | |
changeset 20398 | b206c580c45f |
parent 12381 | 1438e0fbfa27 |
child 21119 | ca1c9dd0e277 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2011, 2012, 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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#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCREGION_HPP |
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#define SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCREGION_HPP |
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#include "gc_implementation/g1/heapRegion.hpp" |
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class G1CollectedHeap; |
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// 0 -> no tracing, 1 -> basic tracing, 2 -> basic + allocation tracing |
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#define G1_ALLOC_REGION_TRACING 0 |
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class ar_ext_msg; |
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// A class that holds a region that is active in satisfying allocation |
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// requests, potentially issued in parallel. When the active region is |
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// full it will be retired and replaced with a new one. The |
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// implementation assumes that fast-path allocations will be lock-free |
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// and a lock will need to be taken when the active region needs to be |
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// replaced. |
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class G1AllocRegion VALUE_OBJ_CLASS_SPEC { |
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friend class ar_ext_msg; |
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|
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private: |
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// The active allocating region we are currently allocating out |
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// of. The invariant is that if this object is initialized (i.e., |
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// init() has been called and release() has not) then _alloc_region |
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// is either an active allocating region or the dummy region (i.e., |
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// it can never be NULL) and this object can be used to satisfy |
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// allocation requests. If this object is not initialized |
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// (i.e. init() has not been called or release() has been called) |
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// then _alloc_region is NULL and this object should not be used to |
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// satisfy allocation requests (it was done this way to force the |
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// correct use of init() and release()). |
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HeapRegion* _alloc_region; |
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// It keeps track of the distinct number of regions that are used |
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// for allocation in the active interval of this object, i.e., |
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// between a call to init() and a call to release(). The count |
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// mostly includes regions that are freshly allocated, as well as |
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// the region that is re-used using the set() method. This count can |
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// be used in any heuristics that might want to bound how many |
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// distinct regions this object can used during an active interval. |
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uint _count; |
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// When we set up a new active region we save its used bytes in this |
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// field so that, when we retire it, we can calculate how much space |
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// we allocated in it. |
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size_t _used_bytes_before; |
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// When true, indicates that allocate calls should do BOT updates. |
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const bool _bot_updates; |
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// Useful for debugging and tracing. |
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const char* _name; |
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// A dummy region (i.e., it's been allocated specially for this |
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// purpose and it is not part of the heap) that is full (i.e., top() |
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// == end()). When we don't have a valid active region we make |
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// _alloc_region point to this. This allows us to skip checking |
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// whether the _alloc_region is NULL or not. |
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static HeapRegion* _dummy_region; |
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// Some of the methods below take a bot_updates parameter. Its value |
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// should be the same as the _bot_updates field. The idea is that |
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// the parameter will be a constant for a particular alloc region |
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// and, given that these methods will be hopefully inlined, the |
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// compiler should compile out the test. |
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// Perform a non-MT-safe allocation out of the given region. |
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static inline HeapWord* allocate(HeapRegion* alloc_region, |
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size_t word_size, |
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bool bot_updates); |
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// Perform a MT-safe allocation out of the given region. |
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static inline HeapWord* par_allocate(HeapRegion* alloc_region, |
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size_t word_size, |
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bool bot_updates); |
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// Ensure that the region passed as a parameter has been filled up |
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// so that noone else can allocate out of it any more. |
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static void fill_up_remaining_space(HeapRegion* alloc_region, |
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bool bot_updates); |
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// Retire the active allocating region. If fill_up is true then make |
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// sure that the region is full before we retire it so that noone |
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// else can allocate out of it. |
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void retire(bool fill_up); |
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// Allocate a new active region and use it to perform a word_size |
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// allocation. The force parameter will be passed on to |
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// G1CollectedHeap::allocate_new_alloc_region() and tells it to try |
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// to allocate a new region even if the max has been reached. |
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HeapWord* new_alloc_region_and_allocate(size_t word_size, bool force); |
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void fill_in_ext_msg(ar_ext_msg* msg, const char* message); |
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protected: |
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// For convenience as subclasses use it. |
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static G1CollectedHeap* _g1h; |
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virtual HeapRegion* allocate_new_region(size_t word_size, bool force) = 0; |
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virtual void retire_region(HeapRegion* alloc_region, |
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size_t allocated_bytes) = 0; |
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G1AllocRegion(const char* name, bool bot_updates); |
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public: |
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static void setup(G1CollectedHeap* g1h, HeapRegion* dummy_region); |
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HeapRegion* get() const { |
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// Make sure that the dummy region does not escape this class. |
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return (_alloc_region == _dummy_region) ? NULL : _alloc_region; |
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} |
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uint count() { return _count; } |
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// The following two are the building blocks for the allocation method. |
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// First-level allocation: Should be called without holding a |
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// lock. It will try to allocate lock-free out of the active region, |
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// or return NULL if it was unable to. |
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inline HeapWord* attempt_allocation(size_t word_size, bool bot_updates); |
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// Second-level allocation: Should be called while holding a |
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// lock. It will try to first allocate lock-free out of the active |
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// region or, if it's unable to, it will try to replace the active |
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// alloc region with a new one. We require that the caller takes the |
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// appropriate lock before calling this so that it is easier to make |
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// it conform to its locking protocol. |
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inline HeapWord* attempt_allocation_locked(size_t word_size, |
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bool bot_updates); |
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// Should be called to allocate a new region even if the max of this |
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// type of regions has been reached. Should only be called if other |
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// allocation attempts have failed and we are not holding a valid |
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// active region. |
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inline HeapWord* attempt_allocation_force(size_t word_size, |
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bool bot_updates); |
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// Should be called before we start using this object. |
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void init(); |
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// This can be used to set the active region to a specific |
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// region. (Use Example: we try to retain the last old GC alloc |
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// region that we've used during a GC and we can use set() to |
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// re-instate it at the beginning of the next GC.) |
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void set(HeapRegion* alloc_region); |
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// Should be called when we want to release the active region which |
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// is returned after it's been retired. |
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HeapRegion* release(); |
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#if G1_ALLOC_REGION_TRACING |
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void trace(const char* str, size_t word_size = 0, HeapWord* result = NULL); |
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#else // G1_ALLOC_REGION_TRACING |
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void trace(const char* str, size_t word_size = 0, HeapWord* result = NULL) { } |
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#endif // G1_ALLOC_REGION_TRACING |
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}; |
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class ar_ext_msg : public err_msg { |
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public: |
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ar_ext_msg(G1AllocRegion* alloc_region, const char *message) : err_msg("") { |
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alloc_region->fill_in_ext_msg(this, message); |
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} |
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}; |
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#endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCREGION_HPP |