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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "gpu/command_buffer/client/mapped_memory.h"
#include <algorithm>
#include <functional>
#include "base/debug/trace_event.h"
#include "base/logging.h"
#include "gpu/command_buffer/client/cmd_buffer_helper.h"
namespace gpu {
MemoryChunk::MemoryChunk(int32 shm_id,
scoped_refptr<gpu::Buffer> shm,
CommandBufferHelper* helper,
const base::Closure& poll_callback)
: shm_id_(shm_id),
shm_(shm),
allocator_(shm->size(), helper, poll_callback, shm->memory()) {}
MemoryChunk::~MemoryChunk() {}
MappedMemoryManager::MappedMemoryManager(CommandBufferHelper* helper,
const base::Closure& poll_callback,
size_t unused_memory_reclaim_limit)
: chunk_size_multiple_(1),
helper_(helper),
poll_callback_(poll_callback),
allocated_memory_(0),
max_free_bytes_(unused_memory_reclaim_limit) {
}
MappedMemoryManager::~MappedMemoryManager() {
CommandBuffer* cmd_buf = helper_->command_buffer();
for (MemoryChunkVector::iterator iter = chunks_.begin();
iter != chunks_.end(); ++iter) {
MemoryChunk* chunk = *iter;
cmd_buf->DestroyTransferBuffer(chunk->shm_id());
}
}
void* MappedMemoryManager::Alloc(
unsigned int size, int32* shm_id, unsigned int* shm_offset) {
DCHECK(shm_id);
DCHECK(shm_offset);
if (size <= allocated_memory_) {
size_t total_bytes_in_use = 0;
// See if any of the chunks can satisfy this request.
for (size_t ii = 0; ii < chunks_.size(); ++ii) {
MemoryChunk* chunk = chunks_[ii];
chunk->FreeUnused();
total_bytes_in_use += chunk->bytes_in_use();
if (chunk->GetLargestFreeSizeWithoutWaiting() >= size) {
void* mem = chunk->Alloc(size);
DCHECK(mem);
*shm_id = chunk->shm_id();
*shm_offset = chunk->GetOffset(mem);
return mem;
}
}
// If there is a memory limit being enforced and total free
// memory (allocated_memory_ - total_bytes_in_use) is larger than
// the limit try waiting.
if (max_free_bytes_ != kNoLimit &&
(allocated_memory_ - total_bytes_in_use) >= max_free_bytes_) {
TRACE_EVENT0("gpu", "MappedMemoryManager::Alloc::wait");
for (size_t ii = 0; ii < chunks_.size(); ++ii) {
MemoryChunk* chunk = chunks_[ii];
if (chunk->GetLargestFreeSizeWithWaiting() >= size) {
void* mem = chunk->Alloc(size);
DCHECK(mem);
*shm_id = chunk->shm_id();
*shm_offset = chunk->GetOffset(mem);
return mem;
}
}
}
}
// Make a new chunk to satisfy the request.
CommandBuffer* cmd_buf = helper_->command_buffer();
unsigned int chunk_size =
((size + chunk_size_multiple_ - 1) / chunk_size_multiple_) *
chunk_size_multiple_;
int32 id = -1;
scoped_refptr<gpu::Buffer> shm =
cmd_buf->CreateTransferBuffer(chunk_size, &id);
if (id < 0)
return NULL;
DCHECK(shm);
MemoryChunk* mc = new MemoryChunk(id, shm, helper_, poll_callback_);
allocated_memory_ += mc->GetSize();
chunks_.push_back(mc);
void* mem = mc->Alloc(size);
DCHECK(mem);
*shm_id = mc->shm_id();
*shm_offset = mc->GetOffset(mem);
return mem;
}
void MappedMemoryManager::Free(void* pointer) {
for (size_t ii = 0; ii < chunks_.size(); ++ii) {
MemoryChunk* chunk = chunks_[ii];
if (chunk->IsInChunk(pointer)) {
chunk->Free(pointer);
return;
}
}
NOTREACHED();
}
void MappedMemoryManager::FreePendingToken(void* pointer, int32 token) {
for (size_t ii = 0; ii < chunks_.size(); ++ii) {
MemoryChunk* chunk = chunks_[ii];
if (chunk->IsInChunk(pointer)) {
chunk->FreePendingToken(pointer, token);
return;
}
}
NOTREACHED();
}
void MappedMemoryManager::FreeUnused() {
CommandBuffer* cmd_buf = helper_->command_buffer();
MemoryChunkVector::iterator iter = chunks_.begin();
while (iter != chunks_.end()) {
MemoryChunk* chunk = *iter;
chunk->FreeUnused();
if (!chunk->InUse()) {
cmd_buf->DestroyTransferBuffer(chunk->shm_id());
allocated_memory_ -= chunk->GetSize();
iter = chunks_.erase(iter);
} else {
++iter;
}
}
}
} // namespace gpu
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