/* * 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. ``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 * 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 <algorithm> #include <sys/sysctl.h> #include <sys/types.h> namespace WebCore { void VNodeTracker::platformInitialize() { unsigned systemMaxVNodes = 0; size_t len = sizeof(systemMaxVNodes); // Query the maximum number of vnodes on the system and use 15% of that value as soft limit for this process, // and 20% of that value as hard limit. if (sysctlbyname("kern.maxvnodes", &systemMaxVNodes, &len, nullptr, 0)) return; LOG(MemoryPressure, "System vnode limit is %u", systemMaxVNodes); m_softVNodeLimit = std::max(m_softVNodeLimit, static_cast<unsigned>(systemMaxVNodes * 0.15)); m_hardVNodeLimit = std::max(m_hardVNodeLimit, static_cast<unsigned>(systemMaxVNodes * 0.2)); } } // namespace WebCore