| // Copyright 2012 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include "sweeper-thread.h" |
| |
| #include "v8.h" |
| |
| #include "isolate.h" |
| #include "v8threads.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| static const int kSweeperThreadStackSize = 64 * KB; |
| |
| SweeperThread::SweeperThread(Isolate* isolate) |
| : Thread(Thread::Options("v8:SweeperThread", kSweeperThreadStackSize)), |
| isolate_(isolate), |
| heap_(isolate->heap()), |
| collector_(heap_->mark_compact_collector()), |
| start_sweeping_semaphore_(OS::CreateSemaphore(0)), |
| end_sweeping_semaphore_(OS::CreateSemaphore(0)), |
| stop_semaphore_(OS::CreateSemaphore(0)), |
| free_list_old_data_space_(heap_->paged_space(OLD_DATA_SPACE)), |
| free_list_old_pointer_space_(heap_->paged_space(OLD_POINTER_SPACE)), |
| private_free_list_old_data_space_(heap_->paged_space(OLD_DATA_SPACE)), |
| private_free_list_old_pointer_space_( |
| heap_->paged_space(OLD_POINTER_SPACE)) { |
| NoBarrier_Store(&stop_thread_, static_cast<AtomicWord>(false)); |
| } |
| |
| |
| void SweeperThread::Run() { |
| Isolate::SetIsolateThreadLocals(isolate_, NULL); |
| while (true) { |
| start_sweeping_semaphore_->Wait(); |
| |
| if (Acquire_Load(&stop_thread_)) { |
| stop_semaphore_->Signal(); |
| return; |
| } |
| |
| collector_->SweepInParallel(heap_->old_data_space(), |
| &private_free_list_old_data_space_, |
| &free_list_old_data_space_); |
| collector_->SweepInParallel(heap_->old_pointer_space(), |
| &private_free_list_old_pointer_space_, |
| &free_list_old_pointer_space_); |
| end_sweeping_semaphore_->Signal(); |
| } |
| } |
| |
| |
| intptr_t SweeperThread::StealMemory(PagedSpace* space) { |
| intptr_t free_bytes = 0; |
| if (space->identity() == OLD_POINTER_SPACE) { |
| free_bytes = space->free_list()->Concatenate(&free_list_old_pointer_space_); |
| space->AddToAccountingStats(free_bytes); |
| } else if (space->identity() == OLD_DATA_SPACE) { |
| free_bytes = space->free_list()->Concatenate(&free_list_old_data_space_); |
| space->AddToAccountingStats(free_bytes); |
| } |
| return free_bytes; |
| } |
| |
| void SweeperThread::Stop() { |
| Release_Store(&stop_thread_, static_cast<AtomicWord>(true)); |
| start_sweeping_semaphore_->Signal(); |
| stop_semaphore_->Wait(); |
| } |
| |
| |
| void SweeperThread::StartSweeping() { |
| start_sweeping_semaphore_->Signal(); |
| } |
| |
| |
| void SweeperThread::WaitForSweeperThread() { |
| end_sweeping_semaphore_->Wait(); |
| } |
| } } // namespace v8::internal |