decd0fed78
I changed the implementation of a queue between the VM and processor thread to be unbounded and lock-free, using Herb Sutter's example from DDJ article: http://www.ddj.com/high-performance-computing/210604448 This had brought back profiling overhead to a minimum for the page from Chromium's issue 16184. BUG=714 Review URL: http://codereview.chromium.org/2091019 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4706 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
54 lines
2.1 KiB
C++
54 lines
2.1 KiB
C++
// Copyright 2010 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.
|
|
|
|
#ifndef V8_CIRCULAR_BUFFER_INL_H_
|
|
#define V8_CIRCULAR_BUFFER_INL_H_
|
|
|
|
#include "circular-queue.h"
|
|
|
|
namespace v8 {
|
|
namespace internal {
|
|
|
|
|
|
void* SamplingCircularQueue::Enqueue() {
|
|
WrapPositionIfNeeded(&producer_pos_->enqueue_pos);
|
|
void* result = producer_pos_->enqueue_pos;
|
|
producer_pos_->enqueue_pos += record_size_;
|
|
return result;
|
|
}
|
|
|
|
|
|
void SamplingCircularQueue::WrapPositionIfNeeded(
|
|
SamplingCircularQueue::Cell** pos) {
|
|
if (**pos == kEnd) *pos = buffer_;
|
|
}
|
|
|
|
|
|
} } // namespace v8::internal
|
|
|
|
#endif // V8_CIRCULAR_BUFFER_INL_H_
|