164 lines
5.2 KiB
C++
164 lines
5.2 KiB
C++
/*
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* Copyright (C) 2011, 2012 Apple Inc. All Rights Reserved.
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* Copyright (C) 2014 Raspberry Pi Foundation. All Rights Reserved.
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* Copyright (C) 2018 Igalia S.L.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include <wtf/MemoryPressureHandler.h>
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#include <malloc.h>
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#include <unistd.h>
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#include <wtf/Logging.h>
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#include <wtf/MainThread.h>
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#include <wtf/MemoryFootprint.h>
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#include <wtf/text/WTFString.h>
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#if OS(LINUX)
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#include <wtf/linux/CurrentProcessMemoryStatus.h>
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#elif OS(HAIKU)
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#include <wtf/haiku/CurrentProcessMemoryStatus.h>
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#elif OS(FREEBSD)
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#include <sys/sysctl.h>
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#include <sys/types.h>
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#include <sys/user.h>
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#endif
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namespace WTF {
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// Disable memory event reception for a minimum of s_minimumHoldOffTime
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// seconds after receiving an event. Don't let events fire any sooner than
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// s_holdOffMultiplier times the last cleanup processing time. Effectively
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// this is 1 / s_holdOffMultiplier percent of the time.
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// If after releasing the memory we don't free at least s_minimumBytesFreedToUseMinimumHoldOffTime,
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// we wait longer to try again (s_maximumHoldOffTime).
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// These value seems reasonable and testing verifies that it throttles frequent
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// low memory events, greatly reducing CPU usage.
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static const Seconds s_minimumHoldOffTime { 5_s };
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static const Seconds s_maximumHoldOffTime { 30_s };
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static const size_t s_minimumBytesFreedToUseMinimumHoldOffTime = 1 * MB;
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static const unsigned s_holdOffMultiplier = 20;
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void MemoryPressureHandler::triggerMemoryPressureEvent(bool isCritical)
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{
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if (!m_installed)
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return;
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if (ReliefLogger::loggingEnabled())
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LOG(MemoryPressure, "Got memory pressure notification (%s)", isCritical ? "critical" : "non-critical");
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setUnderMemoryPressure(true);
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ensureOnMainThread([this, isCritical] {
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respondToMemoryPressure(isCritical ? Critical::Yes : Critical::No);
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});
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if (ReliefLogger::loggingEnabled() && isUnderMemoryPressure())
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LOG(MemoryPressure, "System is no longer under memory pressure.");
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setUnderMemoryPressure(false);
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}
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void MemoryPressureHandler::install()
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{
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if (m_installed || m_holdOffTimer.isActive())
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return;
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m_installed = true;
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}
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void MemoryPressureHandler::uninstall()
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{
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if (!m_installed)
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return;
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m_holdOffTimer.stop();
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m_installed = false;
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}
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void MemoryPressureHandler::holdOffTimerFired()
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{
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install();
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}
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void MemoryPressureHandler::holdOff(Seconds seconds)
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{
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m_holdOffTimer.startOneShot(seconds);
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}
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static size_t processMemoryUsage()
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{
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#if OS(LINUX) || OS(HAIKU)
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ProcessMemoryStatus memoryStatus;
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currentProcessMemoryStatus(memoryStatus);
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return (memoryStatus.resident - memoryStatus.shared);
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#elif OS(FREEBSD)
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static size_t pageSize = sysconf(_SC_PAGE_SIZE);
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struct kinfo_proc info;
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size_t infolen = sizeof(info);
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int mib[4];
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mib[0] = CTL_KERN;
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mib[1] = KERN_PROC;
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mib[2] = KERN_PROC_PID;
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mib[3] = getpid();
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if (sysctl(mib, 4, &info, &infolen, nullptr, 0))
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return 0;
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return static_cast<size_t>(info.ki_rssize - info.ki_tsize) * pageSize;
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#else
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#error "Missing a platform specific way of determining the memory usage"
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#endif
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}
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void MemoryPressureHandler::respondToMemoryPressure(Critical critical, Synchronous synchronous)
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{
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uninstall();
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MonotonicTime startTime = MonotonicTime::now();
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int64_t processMemory = processMemoryUsage();
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releaseMemory(critical, synchronous);
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int64_t bytesFreed = processMemory - processMemoryUsage();
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Seconds holdOffTime = s_maximumHoldOffTime;
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if (bytesFreed > 0 && static_cast<size_t>(bytesFreed) >= s_minimumBytesFreedToUseMinimumHoldOffTime)
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holdOffTime = (MonotonicTime::now() - startTime) * s_holdOffMultiplier;
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holdOff(std::max(holdOffTime, s_minimumHoldOffTime));
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}
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void MemoryPressureHandler::platformReleaseMemory(Critical)
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{
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#if HAVE(MALLOC_TRIM)
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malloc_trim(0);
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#endif
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}
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std::optional<MemoryPressureHandler::ReliefLogger::MemoryUsage> MemoryPressureHandler::ReliefLogger::platformMemoryUsage()
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{
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return MemoryUsage {processMemoryUsage(), memoryFootprint()};
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}
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} // namespace WTF
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