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/*
* Copyright (C) 2015 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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 "config.h"
#include "VNodeTracker.h"
#include "Logging.h"
#include <wtf/NeverDestroyed.h>
#include <wtf/RunLoop.h>
namespace WebCore {
VNodeTracker& VNodeTracker::singleton()
{
static NeverDestroyed<VNodeTracker> vnodeTracker;
return vnodeTracker;
}
VNodeTracker::VNodeTracker()
: m_pressureWarningTimer(*this, &VNodeTracker::pressureWarningTimerFired)
, m_lastWarningTime(std::chrono::steady_clock::now())
{
platformInitialize();
LOG(MemoryPressure, "Using following vnode limits for this process: soft=%u, hard=%u", m_softVNodeLimit, m_hardVNodeLimit);
}
void VNodeTracker::checkPressureState()
{
ASSERT(m_pressureHandler);
if (m_vnodeCounter.value() <= m_softVNodeLimit)
return;
if (!m_pressureWarningTimer.isActive())
m_pressureWarningTimer.startOneShot(nextPressureWarningInterval());
}
void VNodeTracker::pressureWarningTimerFired()
{
if (m_vnodeCounter.value() <= m_softVNodeLimit)
return;
m_lastWarningTime = std::chrono::steady_clock::now();
unsigned vnodeCount = m_vnodeCounter.value();
auto critical = vnodeCount > m_hardVNodeLimit ? Critical::Yes : Critical::No;
m_pressureHandler(critical);
LOG(MemoryPressure, "vnode pressure handler freed %d vnodes out of %u (critical pressure: %s)", vnodeCount - m_vnodeCounter.value(), vnodeCount, critical == Critical::Yes ? "Yes" : "No");
}
std::chrono::milliseconds VNodeTracker::nextPressureWarningInterval() const
{
// We run the vnode pressure handler every 30 seconds at most.
static const auto minimumWarningInterval = std::chrono::seconds { 30 };
auto timeSinceLastWarning = std::chrono::steady_clock::now() - m_lastWarningTime;
if (timeSinceLastWarning < minimumWarningInterval)
return std::chrono::duration_cast<std::chrono::milliseconds>(minimumWarningInterval - timeSinceLastWarning);
return std::chrono::milliseconds { 0 };
}
#if !PLATFORM(COCOA)
void VNodeTracker::platformInitialize()
{
}
#endif
} // namespace WebCore
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