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AvailableMemory.cpp
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224 lines (198 loc) · 6.92 KB
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/*
* Copyright (C) 2012-2017 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 "AvailableMemory.h"
#include "Environment.h"
#if BPLATFORM(IOS_FAMILY)
#include "MemoryStatusSPI.h"
#endif
#include "PerProcess.h"
#include "Scavenger.h"
#include "Sizes.h"
#include <array>
#include <mutex>
#if BOS(DARWIN)
#if BPLATFORM(IOS_FAMILY)
#import <algorithm>
#endif
#import <dispatch/dispatch.h>
#import <mach/host_info.h>
#import <mach/mach.h>
#import <mach/mach_error.h>
#import <math.h>
#elif BOS(UNIX)
#if BOS(FREEBSD) || BOS(LINUX)
#include <sys/sysinfo.h>
#endif
#if BOS(LINUX)
#include <algorithm>
#include <fcntl.h>
#elif BOS(FREEBSD)
#include "VMAllocate.h"
#include <sys/sysctl.h>
#include <sys/types.h>
#include <sys/user.h>
#endif
#include <unistd.h>
#endif
namespace bmalloc {
static constexpr size_t availableMemoryGuess = 512 * bmalloc::MB;
#if BOS(DARWIN)
static size_t memorySizeAccordingToKernel()
{
#if BPLATFORM(IOS_FAMILY_SIMULATOR)
BUNUSED_PARAM(availableMemoryGuess);
// Pretend we have 1024MB of memory to make cache sizes behave like on device.
return 1024 * bmalloc::MB;
#else
host_basic_info_data_t hostInfo;
mach_port_t host = mach_host_self();
mach_msg_type_number_t count = HOST_BASIC_INFO_COUNT;
kern_return_t r = host_info(host, HOST_BASIC_INFO, (host_info_t)&hostInfo, &count);
mach_port_deallocate(mach_task_self(), host);
if (r != KERN_SUCCESS)
return availableMemoryGuess;
if (hostInfo.max_mem > std::numeric_limits<size_t>::max())
return std::numeric_limits<size_t>::max();
return static_cast<size_t>(hostInfo.max_mem);
#endif
}
#endif
#if BPLATFORM(IOS_FAMILY)
static size_t jetsamLimit()
{
memorystatus_memlimit_properties_t properties;
pid_t pid = getpid();
if (memorystatus_control(MEMORYSTATUS_CMD_GET_MEMLIMIT_PROPERTIES, pid, 0, &properties, sizeof(properties)))
return 840 * bmalloc::MB;
if (properties.memlimit_active < 0)
return std::numeric_limits<size_t>::max();
return static_cast<size_t>(properties.memlimit_active) * bmalloc::MB;
}
#endif
#if BOS(LINUX)
struct LinuxMemory {
static const LinuxMemory& singleton()
{
static LinuxMemory s_singleton;
static std::once_flag s_onceFlag;
std::call_once(s_onceFlag,
[] {
s_singleton.pageSize = sysconf(_SC_PAGE_SIZE);
s_singleton.statmFd = open("/proc/self/statm", O_RDONLY | O_CLOEXEC);
});
return s_singleton;
}
size_t footprint() const
{
if (statmFd == -1)
return 0;
std::array<char, 256> statmBuffer;
ssize_t numBytes = pread(statmFd, statmBuffer.data(), statmBuffer.size(), 0);
if (numBytes <= 0)
return 0;
std::array<char, 32> rssBuffer;
{
auto begin = std::find(statmBuffer.begin(), statmBuffer.end(), ' ');
if (begin == statmBuffer.end())
return 0;
std::advance(begin, 1);
auto end = std::find(begin, statmBuffer.end(), ' ');
if (end == statmBuffer.end())
return 0;
auto last = std::copy_n(begin, std::min<size_t>(31, std::distance(begin, end)), rssBuffer.begin());
*last = '\0';
}
unsigned long dirtyPages = strtoul(rssBuffer.data(), nullptr, 10);
return dirtyPages * pageSize;
}
long pageSize { 0 };
int statmFd { -1 };
};
#endif
static size_t computeAvailableMemory()
{
#if BOS(DARWIN)
size_t sizeAccordingToKernel = memorySizeAccordingToKernel();
#if BPLATFORM(IOS_FAMILY)
sizeAccordingToKernel = std::min(sizeAccordingToKernel, jetsamLimit());
#endif
size_t multiple = 128 * bmalloc::MB;
// Round up the memory size to a multiple of 128MB because max_mem may not be exactly 512MB
// (for example) and we have code that depends on those boundaries.
return ((sizeAccordingToKernel + multiple - 1) / multiple) * multiple;
#elif BOS(FREEBSD) || BOS(LINUX)
struct sysinfo info;
if (!sysinfo(&info))
return info.totalram * info.mem_unit;
return availableMemoryGuess;
#elif BOS(UNIX)
long pages = sysconf(_SC_PHYS_PAGES);
long pageSize = sysconf(_SC_PAGE_SIZE);
if (pages == -1 || pageSize == -1)
return availableMemoryGuess;
return pages * pageSize;
#else
return availableMemoryGuess;
#endif
}
size_t availableMemory()
{
static size_t availableMemory;
static std::once_flag onceFlag;
std::call_once(onceFlag, [] {
availableMemory = computeAvailableMemory();
});
return availableMemory;
}
#if BPLATFORM(IOS_FAMILY) || BOS(LINUX) || BOS(FREEBSD)
MemoryStatus memoryStatus()
{
#if BPLATFORM(IOS_FAMILY)
task_vm_info_data_t vmInfo;
mach_msg_type_number_t vmSize = TASK_VM_INFO_COUNT;
size_t memoryFootprint = 0;
if (KERN_SUCCESS == task_info(mach_task_self(), TASK_VM_INFO, (task_info_t)(&vmInfo), &vmSize))
memoryFootprint = static_cast<size_t>(vmInfo.phys_footprint);
#elif BOS(LINUX)
auto& memory = LinuxMemory::singleton();
size_t memoryFootprint = memory.footprint();
#elif BOS(FREEBSD)
struct kinfo_proc info;
size_t infolen = sizeof(info);
int mib[4];
mib[0] = CTL_KERN;
mib[1] = KERN_PROC;
mib[2] = KERN_PROC_PID;
mib[3] = getpid();
size_t memoryFootprint = 0;
if (!sysctl(mib, 4, &info, &infolen, nullptr, 0))
memoryFootprint = static_cast<size_t>(info.ki_rssize) * vmPageSize();
#endif
double percentInUse = static_cast<double>(memoryFootprint) / static_cast<double>(availableMemory());
double percentAvailableMemoryInUse = std::min(percentInUse, 1.0);
return MemoryStatus(memoryFootprint, percentAvailableMemoryInUse);
}
#endif
} // namespace bmalloc