2018-06-20 18:56:26 +03:00
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/*
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* Copyright (c) 2016-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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*/
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#include "eden/fs/utils/ProcUtil.h"
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2019-05-28 22:52:45 +03:00
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#include <array>
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2018-06-20 18:56:26 +03:00
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#include <fstream>
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#include <vector>
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2019-05-28 22:52:45 +03:00
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#include <folly/Conv.h>
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#include <folly/FileUtil.h>
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#include <folly/logging/xlog.h>
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#include <folly/portability/Unistd.h>
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using folly::StringPiece;
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using std::optional;
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2018-06-20 18:56:26 +03:00
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namespace facebook {
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namespace eden {
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namespace proc_util {
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2019-05-28 22:52:45 +03:00
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optional<MemoryStats> readMemoryStats() {
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return readStatmFile("/proc/self/statm");
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}
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optional<MemoryStats> readStatmFile(const char* filename) {
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std::string contents;
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if (!folly::readFile(filename, contents)) {
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return std::nullopt;
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}
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auto pageSize = sysconf(_SC_PAGESIZE);
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if (pageSize == -1) {
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return std::nullopt;
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}
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return parseStatmFile(contents, pageSize);
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}
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optional<MemoryStats> parseStatmFile(StringPiece data, size_t pageSize) {
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std::array<size_t, 7> values;
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for (size_t& value : values) {
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auto parseResult = folly::parseTo(data, value);
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if (parseResult.hasError()) {
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return std::nullopt;
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}
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data = parseResult.value();
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}
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MemoryStats stats{};
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stats.size = pageSize * values[0];
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stats.resident = pageSize * values[1];
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stats.shared = pageSize * values[2];
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stats.text = pageSize * values[3];
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// values[4] is always 0 since Linux 2.6
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stats.data = pageSize * values[5];
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// values[6] is always 0 since Linux 2.6
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return stats;
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}
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2018-06-20 18:56:26 +03:00
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std::string& trim(std::string& str, const std::string& delim) {
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str.erase(0, str.find_first_not_of(delim));
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str.erase(str.find_last_not_of(delim) + 1);
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return str;
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}
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std::pair<std::string, std::string> getKeyValuePair(
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const std::string& line,
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const std::string& delim) {
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std::vector<std::string> v;
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std::pair<std::string, std::string> result;
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folly::split(delim, line, v);
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if (v.size() == 2) {
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result.first = trim(v.front());
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result.second = trim(v.back());
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}
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return result;
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}
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std::vector<std::unordered_map<std::string, std::string>> parseProcSmaps(
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std::istream& input) {
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std::vector<std::unordered_map<std::string, std::string>> entryList;
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bool headerFound{false};
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std::unordered_map<std::string, std::string> currentMap;
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for (std::string line; getline(input, line);) {
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if (line.find("-") != std::string::npos) {
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if (!currentMap.empty()) {
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entryList.push_back(currentMap);
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currentMap.clear();
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}
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headerFound = true;
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} else {
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if (!headerFound) {
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XLOG(WARN) << "Failed to parse smaps file ";
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continue;
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}
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auto keyValue = getKeyValuePair(line, ":");
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if (!keyValue.first.empty()) {
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currentMap[keyValue.first] = keyValue.second;
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} else {
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XLOG(WARN) << "Failed to parse smaps field in smaps file ";
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}
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}
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}
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if (!currentMap.empty()) {
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entryList.push_back(currentMap);
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}
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return entryList;
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}
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std::vector<std::unordered_map<std::string, std::string>> loadProcSmaps() {
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return loadProcSmaps(kLinuxProcSmapsPath);
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}
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std::vector<std::unordered_map<std::string, std::string>> loadProcSmaps(
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folly::StringPiece procSmapsPath) {
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try {
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std::ifstream input(procSmapsPath.data());
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return parseProcSmaps(input);
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} catch (const std::exception& ex) {
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XLOG(WARN) << "Failed to parse memory usage: " << ex.what();
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}
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return std::vector<std::unordered_map<std::string, std::string>>();
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}
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2018-10-24 03:03:12 +03:00
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std::optional<uint64_t> calculatePrivateBytes(
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2018-06-20 18:56:26 +03:00
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std::vector<std::unordered_map<std::string, std::string>> smapsListOfMaps) {
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uint64_t count{0};
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for (auto currentMap : smapsListOfMaps) {
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auto iter = currentMap.find("Private_Dirty");
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if (iter != currentMap.end()) {
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auto& entry = iter->second;
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if (entry.rfind(" kB") != std::string::npos) {
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auto countString = entry.substr(0, entry.size() - 3);
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try {
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count += std::stoull(countString) * 1024;
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} catch (const std::invalid_argument& ex) {
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XLOG(WARN) << "Failed to extract long from /proc/smaps value ''"
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<< countString << "' error: " << ex.what();
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2018-10-24 03:03:12 +03:00
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return std::nullopt;
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2018-06-20 18:56:26 +03:00
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} catch (const std::out_of_range& ex) {
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XLOG(WARN) << "Failed to extract long from proc/status value ''"
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<< countString << "' error: " << ex.what();
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2018-10-24 03:03:12 +03:00
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return std::nullopt;
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2018-06-20 18:56:26 +03:00
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}
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} else {
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XLOG(WARN) << "Failed to find Private_Dirty units in: "
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<< kLinuxProcSmapsPath;
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2018-10-24 03:03:12 +03:00
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return std::nullopt;
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2018-06-20 18:56:26 +03:00
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}
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}
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}
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return count;
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}
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2018-10-24 03:03:12 +03:00
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std::optional<uint64_t> calculatePrivateBytes() {
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2018-06-20 18:56:26 +03:00
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try {
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std::ifstream input(kLinuxProcSmapsPath.data());
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return calculatePrivateBytes(parseProcSmaps(input));
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} catch (const std::exception& ex) {
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XLOG(WARN) << "Failed to parse file " << kLinuxProcSmapsPath << ex.what();
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2018-10-24 03:03:12 +03:00
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return std::nullopt;
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2018-06-20 18:56:26 +03:00
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}
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}
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} // namespace proc_util
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} // namespace eden
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} // namespace facebook
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