| /* |
| * Copyright (c) 2017, 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/shared/genCollectedHeap.hpp" |
| #include "memory/allocation.hpp" |
| #include "memory/allocation.inline.hpp" |
| #include "memory/metaspaceShared.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "memory/universe.hpp" |
| #include "runtime/atomic.hpp" |
| #include "runtime/os.hpp" |
| #include "runtime/task.hpp" |
| #include "runtime/threadCritical.hpp" |
| #include "services/memTracker.hpp" |
| #include "utilities/ostream.hpp" |
| |
| //-------------------------------------------------------------------------------------- |
| // ChunkPool implementation |
| |
| // MT-safe pool of chunks to reduce malloc/free thrashing |
| // NB: not using Mutex because pools are used before Threads are initialized |
| class ChunkPool: public CHeapObj<mtInternal> { |
| Chunk* _first; // first cached Chunk; its first word points to next chunk |
| size_t _num_chunks; // number of unused chunks in pool |
| size_t _num_used; // number of chunks currently checked out |
| const size_t _size; // size of each chunk (must be uniform) |
| |
| // Our four static pools |
| static ChunkPool* _large_pool; |
| static ChunkPool* _medium_pool; |
| static ChunkPool* _small_pool; |
| static ChunkPool* _tiny_pool; |
| |
| // return first element or null |
| void* get_first() { |
| Chunk* c = _first; |
| if (_first) { |
| _first = _first->next(); |
| _num_chunks--; |
| } |
| return c; |
| } |
| |
| public: |
| // All chunks in a ChunkPool has the same size |
| ChunkPool(size_t size) : _size(size) { _first = NULL; _num_chunks = _num_used = 0; } |
| |
| // Allocate a new chunk from the pool (might expand the pool) |
| NOINLINE void* allocate(size_t bytes, AllocFailType alloc_failmode) { |
| assert(bytes == _size, "bad size"); |
| void* p = NULL; |
| // No VM lock can be taken inside ThreadCritical lock, so os::malloc |
| // should be done outside ThreadCritical lock due to NMT |
| { ThreadCritical tc; |
| _num_used++; |
| p = get_first(); |
| } |
| if (p == NULL) p = os::malloc(bytes, mtChunk, CURRENT_PC); |
| if (p == NULL && alloc_failmode == AllocFailStrategy::EXIT_OOM) { |
| vm_exit_out_of_memory(bytes, OOM_MALLOC_ERROR, "ChunkPool::allocate"); |
| } |
| return p; |
| } |
| |
| // Return a chunk to the pool |
| void free(Chunk* chunk) { |
| assert(chunk->length() + Chunk::aligned_overhead_size() == _size, "bad size"); |
| ThreadCritical tc; |
| _num_used--; |
| |
| // Add chunk to list |
| chunk->set_next(_first); |
| _first = chunk; |
| _num_chunks++; |
| } |
| |
| // Prune the pool |
| void free_all_but(size_t n) { |
| Chunk* cur = NULL; |
| Chunk* next; |
| { |
| // if we have more than n chunks, free all of them |
| ThreadCritical tc; |
| if (_num_chunks > n) { |
| // free chunks at end of queue, for better locality |
| cur = _first; |
| for (size_t i = 0; i < (n - 1) && cur != NULL; i++) cur = cur->next(); |
| |
| if (cur != NULL) { |
| next = cur->next(); |
| cur->set_next(NULL); |
| cur = next; |
| |
| // Free all remaining chunks while in ThreadCritical lock |
| // so NMT adjustment is stable. |
| while(cur != NULL) { |
| next = cur->next(); |
| os::free(cur); |
| _num_chunks--; |
| cur = next; |
| } |
| } |
| } |
| } |
| } |
| |
| // Accessors to preallocated pool's |
| static ChunkPool* large_pool() { assert(_large_pool != NULL, "must be initialized"); return _large_pool; } |
| static ChunkPool* medium_pool() { assert(_medium_pool != NULL, "must be initialized"); return _medium_pool; } |
| static ChunkPool* small_pool() { assert(_small_pool != NULL, "must be initialized"); return _small_pool; } |
| static ChunkPool* tiny_pool() { assert(_tiny_pool != NULL, "must be initialized"); return _tiny_pool; } |
| |
| static void initialize() { |
| _large_pool = new ChunkPool(Chunk::size + Chunk::aligned_overhead_size()); |
| _medium_pool = new ChunkPool(Chunk::medium_size + Chunk::aligned_overhead_size()); |
| _small_pool = new ChunkPool(Chunk::init_size + Chunk::aligned_overhead_size()); |
| _tiny_pool = new ChunkPool(Chunk::tiny_size + Chunk::aligned_overhead_size()); |
| } |
| |
| static void clean() { |
| enum { BlocksToKeep = 5 }; |
| _tiny_pool->free_all_but(BlocksToKeep); |
| _small_pool->free_all_but(BlocksToKeep); |
| _medium_pool->free_all_but(BlocksToKeep); |
| _large_pool->free_all_but(BlocksToKeep); |
| } |
| }; |
| |
| ChunkPool* ChunkPool::_large_pool = NULL; |
| ChunkPool* ChunkPool::_medium_pool = NULL; |
| ChunkPool* ChunkPool::_small_pool = NULL; |
| ChunkPool* ChunkPool::_tiny_pool = NULL; |
| |
| void chunkpool_init() { |
| ChunkPool::initialize(); |
| } |
| |
| void |
| Chunk::clean_chunk_pool() { |
| ChunkPool::clean(); |
| } |
| |
| |
| //-------------------------------------------------------------------------------------- |
| // ChunkPoolCleaner implementation |
| // |
| |
| class ChunkPoolCleaner : public PeriodicTask { |
| enum { CleaningInterval = 5000 }; // cleaning interval in ms |
| |
| public: |
| ChunkPoolCleaner() : PeriodicTask(CleaningInterval) {} |
| void task() { |
| ChunkPool::clean(); |
| } |
| }; |
| |
| //-------------------------------------------------------------------------------------- |
| // Chunk implementation |
| |
| void* Chunk::operator new (size_t requested_size, AllocFailType alloc_failmode, size_t length) throw() { |
| // requested_size is equal to sizeof(Chunk) but in order for the arena |
| // allocations to come out aligned as expected the size must be aligned |
| // to expected arena alignment. |
| // expect requested_size but if sizeof(Chunk) doesn't match isn't proper size we must align it. |
| assert(ARENA_ALIGN(requested_size) == aligned_overhead_size(), "Bad alignment"); |
| size_t bytes = ARENA_ALIGN(requested_size) + length; |
| switch (length) { |
| case Chunk::size: return ChunkPool::large_pool()->allocate(bytes, alloc_failmode); |
| case Chunk::medium_size: return ChunkPool::medium_pool()->allocate(bytes, alloc_failmode); |
| case Chunk::init_size: return ChunkPool::small_pool()->allocate(bytes, alloc_failmode); |
| case Chunk::tiny_size: return ChunkPool::tiny_pool()->allocate(bytes, alloc_failmode); |
| default: { |
| void* p = os::malloc(bytes, mtChunk, CALLER_PC); |
| if (p == NULL && alloc_failmode == AllocFailStrategy::EXIT_OOM) { |
| vm_exit_out_of_memory(bytes, OOM_MALLOC_ERROR, "Chunk::new"); |
| } |
| return p; |
| } |
| } |
| } |
| |
| void Chunk::operator delete(void* p) { |
| Chunk* c = (Chunk*)p; |
| switch (c->length()) { |
| case Chunk::size: ChunkPool::large_pool()->free(c); break; |
| case Chunk::medium_size: ChunkPool::medium_pool()->free(c); break; |
| case Chunk::init_size: ChunkPool::small_pool()->free(c); break; |
| case Chunk::tiny_size: ChunkPool::tiny_pool()->free(c); break; |
| default: |
| ThreadCritical tc; // Free chunks under TC lock so that NMT adjustment is stable. |
| os::free(c); |
| } |
| } |
| |
| Chunk::Chunk(size_t length) : _len(length) { |
| _next = NULL; // Chain on the linked list |
| } |
| |
| void Chunk::chop() { |
| Chunk *k = this; |
| while( k ) { |
| Chunk *tmp = k->next(); |
| // clear out this chunk (to detect allocation bugs) |
| if (ZapResourceArea) memset(k->bottom(), badResourceValue, k->length()); |
| delete k; // Free chunk (was malloc'd) |
| k = tmp; |
| } |
| } |
| |
| void Chunk::next_chop() { |
| _next->chop(); |
| _next = NULL; |
| } |
| |
| void Chunk::start_chunk_pool_cleaner_task() { |
| #ifdef ASSERT |
| static bool task_created = false; |
| assert(!task_created, "should not start chuck pool cleaner twice"); |
| task_created = true; |
| #endif |
| ChunkPoolCleaner* cleaner = new ChunkPoolCleaner(); |
| cleaner->enroll(); |
| } |
| |
| //------------------------------Arena------------------------------------------ |
| |
| Arena::Arena(MEMFLAGS flag, size_t init_size) : _flags(flag), _size_in_bytes(0) { |
| size_t round_size = (sizeof (char *)) - 1; |
| init_size = (init_size+round_size) & ~round_size; |
| _first = _chunk = new (AllocFailStrategy::EXIT_OOM, init_size) Chunk(init_size); |
| _hwm = _chunk->bottom(); // Save the cached hwm, max |
| _max = _chunk->top(); |
| MemTracker::record_new_arena(flag); |
| set_size_in_bytes(init_size); |
| } |
| |
| Arena::Arena(MEMFLAGS flag) : _flags(flag), _size_in_bytes(0) { |
| _first = _chunk = new (AllocFailStrategy::EXIT_OOM, Chunk::init_size) Chunk(Chunk::init_size); |
| _hwm = _chunk->bottom(); // Save the cached hwm, max |
| _max = _chunk->top(); |
| MemTracker::record_new_arena(flag); |
| set_size_in_bytes(Chunk::init_size); |
| } |
| |
| Arena *Arena::move_contents(Arena *copy) { |
| copy->destruct_contents(); |
| copy->_chunk = _chunk; |
| copy->_hwm = _hwm; |
| copy->_max = _max; |
| copy->_first = _first; |
| |
| // workaround rare racing condition, which could double count |
| // the arena size by native memory tracking |
| size_t size = size_in_bytes(); |
| set_size_in_bytes(0); |
| copy->set_size_in_bytes(size); |
| // Destroy original arena |
| reset(); |
| return copy; // Return Arena with contents |
| } |
| |
| Arena::~Arena() { |
| destruct_contents(); |
| MemTracker::record_arena_free(_flags); |
| } |
| |
| void* Arena::operator new(size_t size) throw() { |
| assert(false, "Use dynamic memory type binding"); |
| return NULL; |
| } |
| |
| void* Arena::operator new (size_t size, const std::nothrow_t& nothrow_constant) throw() { |
| assert(false, "Use dynamic memory type binding"); |
| return NULL; |
| } |
| |
| // dynamic memory type binding |
| void* Arena::operator new(size_t size, MEMFLAGS flags) throw() { |
| #ifdef ASSERT |
| void* p = (void*)AllocateHeap(size, flags, CALLER_PC); |
| if (PrintMallocFree) trace_heap_malloc(size, "Arena-new", p); |
| return p; |
| #else |
| return (void *) AllocateHeap(size, flags, CALLER_PC); |
| #endif |
| } |
| |
| void* Arena::operator new(size_t size, const std::nothrow_t& nothrow_constant, MEMFLAGS flags) throw() { |
| #ifdef ASSERT |
| void* p = os::malloc(size, flags, CALLER_PC); |
| if (PrintMallocFree) trace_heap_malloc(size, "Arena-new", p); |
| return p; |
| #else |
| return os::malloc(size, flags, CALLER_PC); |
| #endif |
| } |
| |
| void Arena::operator delete(void* p) { |
| FreeHeap(p); |
| } |
| |
| // Destroy this arenas contents and reset to empty |
| void Arena::destruct_contents() { |
| if (UseMallocOnly && _first != NULL) { |
| char* end = _first->next() ? _first->top() : _hwm; |
| free_malloced_objects(_first, _first->bottom(), end, _hwm); |
| } |
| // reset size before chop to avoid a rare racing condition |
| // that can have total arena memory exceed total chunk memory |
| set_size_in_bytes(0); |
| _first->chop(); |
| reset(); |
| } |
| |
| // This is high traffic method, but many calls actually don't |
| // change the size |
| void Arena::set_size_in_bytes(size_t size) { |
| if (_size_in_bytes != size) { |
| long delta = (long)(size - size_in_bytes()); |
| _size_in_bytes = size; |
| MemTracker::record_arena_size_change(delta, _flags); |
| } |
| } |
| |
| // Total of all Chunks in arena |
| size_t Arena::used() const { |
| size_t sum = _chunk->length() - (_max-_hwm); // Size leftover in this Chunk |
| register Chunk *k = _first; |
| while( k != _chunk) { // Whilst have Chunks in a row |
| sum += k->length(); // Total size of this Chunk |
| k = k->next(); // Bump along to next Chunk |
| } |
| return sum; // Return total consumed space. |
| } |
| |
| void Arena::signal_out_of_memory(size_t sz, const char* whence) const { |
| vm_exit_out_of_memory(sz, OOM_MALLOC_ERROR, "%s", whence); |
| } |
| |
| // Grow a new Chunk |
| void* Arena::grow(size_t x, AllocFailType alloc_failmode) { |
| // Get minimal required size. Either real big, or even bigger for giant objs |
| size_t len = MAX2(x, (size_t) Chunk::size); |
| |
| Chunk *k = _chunk; // Get filled-up chunk address |
| _chunk = new (alloc_failmode, len) Chunk(len); |
| |
| if (_chunk == NULL) { |
| _chunk = k; // restore the previous value of _chunk |
| return NULL; |
| } |
| if (k) k->set_next(_chunk); // Append new chunk to end of linked list |
| else _first = _chunk; |
| _hwm = _chunk->bottom(); // Save the cached hwm, max |
| _max = _chunk->top(); |
| set_size_in_bytes(size_in_bytes() + len); |
| void* result = _hwm; |
| _hwm += x; |
| return result; |
| } |
| |
| |
| |
| // Reallocate storage in Arena. |
| void *Arena::Arealloc(void* old_ptr, size_t old_size, size_t new_size, AllocFailType alloc_failmode) { |
| if (new_size == 0) return NULL; |
| #ifdef ASSERT |
| if (UseMallocOnly) { |
| // always allocate a new object (otherwise we'll free this one twice) |
| char* copy = (char*)Amalloc(new_size, alloc_failmode); |
| if (copy == NULL) { |
| return NULL; |
| } |
| size_t n = MIN2(old_size, new_size); |
| if (n > 0) memcpy(copy, old_ptr, n); |
| Afree(old_ptr,old_size); // Mostly done to keep stats accurate |
| return copy; |
| } |
| #endif |
| char *c_old = (char*)old_ptr; // Handy name |
| // Stupid fast special case |
| if( new_size <= old_size ) { // Shrink in-place |
| if( c_old+old_size == _hwm) // Attempt to free the excess bytes |
| _hwm = c_old+new_size; // Adjust hwm |
| return c_old; |
| } |
| |
| // make sure that new_size is legal |
| size_t corrected_new_size = ARENA_ALIGN(new_size); |
| |
| // See if we can resize in-place |
| if( (c_old+old_size == _hwm) && // Adjusting recent thing |
| (c_old+corrected_new_size <= _max) ) { // Still fits where it sits |
| _hwm = c_old+corrected_new_size; // Adjust hwm |
| return c_old; // Return old pointer |
| } |
| |
| // Oops, got to relocate guts |
| void *new_ptr = Amalloc(new_size, alloc_failmode); |
| if (new_ptr == NULL) { |
| return NULL; |
| } |
| memcpy( new_ptr, c_old, old_size ); |
| Afree(c_old,old_size); // Mostly done to keep stats accurate |
| return new_ptr; |
| } |
| |
| |
| // Determine if pointer belongs to this Arena or not. |
| bool Arena::contains( const void *ptr ) const { |
| #ifdef ASSERT |
| if (UseMallocOnly) { |
| // really slow, but not easy to make fast |
| if (_chunk == NULL) return false; |
| char** bottom = (char**)_chunk->bottom(); |
| for (char** p = (char**)_hwm - 1; p >= bottom; p--) { |
| if (*p == ptr) return true; |
| } |
| for (Chunk *c = _first; c != NULL; c = c->next()) { |
| if (c == _chunk) continue; // current chunk has been processed |
| char** bottom = (char**)c->bottom(); |
| for (char** p = (char**)c->top() - 1; p >= bottom; p--) { |
| if (*p == ptr) return true; |
| } |
| } |
| return false; |
| } |
| #endif |
| if( (void*)_chunk->bottom() <= ptr && ptr < (void*)_hwm ) |
| return true; // Check for in this chunk |
| for (Chunk *c = _first; c; c = c->next()) { |
| if (c == _chunk) continue; // current chunk has been processed |
| if ((void*)c->bottom() <= ptr && ptr < (void*)c->top()) { |
| return true; // Check for every chunk in Arena |
| } |
| } |
| return false; // Not in any Chunk, so not in Arena |
| } |
| |
| |
| #ifdef ASSERT |
| void* Arena::malloc(size_t size) { |
| assert(UseMallocOnly, "shouldn't call"); |
| // use malloc, but save pointer in res. area for later freeing |
| char** save = (char**)internal_malloc_4(sizeof(char*)); |
| return (*save = (char*)os::malloc(size, mtChunk)); |
| } |
| |
| // for debugging with UseMallocOnly |
| void* Arena::internal_malloc_4(size_t x) { |
| assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" ); |
| check_for_overflow(x, "Arena::internal_malloc_4"); |
| if (_hwm + x > _max) { |
| return grow(x); |
| } else { |
| char *old = _hwm; |
| _hwm += x; |
| return old; |
| } |
| } |
| #endif |
| |
| |
| //-------------------------------------------------------------------------------------- |
| // Non-product code |
| |
| #ifndef PRODUCT |
| |
| julong Arena::_bytes_allocated = 0; |
| |
| void Arena::inc_bytes_allocated(size_t x) { inc_stat_counter(&_bytes_allocated, x); } |
| |
| // debugging code |
| inline void Arena::free_all(char** start, char** end) { |
| for (char** p = start; p < end; p++) if (*p) os::free(*p); |
| } |
| |
| void Arena::free_malloced_objects(Chunk* chunk, char* hwm, char* max, char* hwm2) { |
| assert(UseMallocOnly, "should not call"); |
| // free all objects malloced since resource mark was created; resource area |
| // contains their addresses |
| if (chunk->next()) { |
| // this chunk is full, and some others too |
| for (Chunk* c = chunk->next(); c != NULL; c = c->next()) { |
| char* top = c->top(); |
| if (c->next() == NULL) { |
| top = hwm2; // last junk is only used up to hwm2 |
| assert(c->contains(hwm2), "bad hwm2"); |
| } |
| free_all((char**)c->bottom(), (char**)top); |
| } |
| assert(chunk->contains(hwm), "bad hwm"); |
| assert(chunk->contains(max), "bad max"); |
| free_all((char**)hwm, (char**)max); |
| } else { |
| // this chunk was partially used |
| assert(chunk->contains(hwm), "bad hwm"); |
| assert(chunk->contains(hwm2), "bad hwm2"); |
| free_all((char**)hwm, (char**)hwm2); |
| } |
| } |
| |
| #endif // Non-product |