92 lines
2.8 KiB
C++
92 lines
2.8 KiB
C++
/* XMRig
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* Copyright (c) 2018-2021 SChernykh <https://github.com/SChernykh>
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* Copyright (c) 2016-2021 XMRig <https://github.com/xmrig>, <support@xmrig.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "crypto/common/LinuxMemory.h"
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#include "3rdparty/fmt/core.h"
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#include "crypto/common/VirtualMemory.h"
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#include <algorithm>
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#include <fstream>
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#include <mutex>
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#include <string>
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namespace xmrig {
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static std::mutex mutex;
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constexpr size_t twoMiB = 2U * 1024U * 1024U;
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constexpr size_t oneGiB = 1024U * 1024U * 1024U;
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static inline std::string sysfs_path(uint32_t node, size_t hugePageSize, bool nr)
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{
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return fmt::format("/sys/devices/system/node/node{}/hugepages/hugepages-{}kB/{}_hugepages", node, hugePageSize / 1024, nr ? "nr" : "free");
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}
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static inline bool write_nr_hugepages(uint32_t node, size_t hugePageSize, uint64_t count) { return LinuxMemory::write(sysfs_path(node, hugePageSize, true).c_str(), count); }
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static inline int64_t free_hugepages(uint32_t node, size_t hugePageSize) { return LinuxMemory::read(sysfs_path(node, hugePageSize, false).c_str()); }
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static inline int64_t nr_hugepages(uint32_t node, size_t hugePageSize) { return LinuxMemory::read(sysfs_path(node, hugePageSize, true).c_str()); }
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} // namespace xmrig
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bool xmrig::LinuxMemory::reserve(size_t size, uint32_t node, size_t hugePageSize)
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{
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std::lock_guard<std::mutex> lock(mutex);
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const size_t required = VirtualMemory::align(size, hugePageSize) / hugePageSize;
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const auto available = free_hugepages(node, hugePageSize);
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if (available < 0 || static_cast<size_t>(available) >= required) {
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return false;
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}
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return write_nr_hugepages(node, hugePageSize, std::max<size_t>(nr_hugepages(node, hugePageSize), 0) + (required - available));
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}
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bool xmrig::LinuxMemory::write(const char *path, uint64_t value)
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{
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std::ofstream file(path, std::ios::out | std::ios::binary | std::ios::trunc);
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if (!file.is_open()) {
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return false;
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}
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file << value;
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file.flush();
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return true;
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}
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int64_t xmrig::LinuxMemory::read(const char *path)
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{
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std::ifstream file(path);
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if (!file.is_open()) {
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return -1;
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}
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uint64_t value = 0;
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file >> value;
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return value;
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}
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