54d8721374
The library is expected to be a unified place for all components to read both global and per-process memory accounting form kernel including getting the working set. This change adds the PageInfo, MemInfo and ProcMemInfo classes and verifies the implementation against libpagemap for correctness. Adds a procmem2 tool show the usage. TODO: Plumbing in os_debug, add vmastats, zoneinfo etc parsing. Test: libmeminfo_test 1 Test: procmem2 1 Test: procmem2 -h -W 1 Test: procmem2 -h -w 1 Test: libmeminfo_benchmark Bug: 111694435 Bug: 114325007 Change-Id: I280440b1dc26a498170686d10fcf63f953a0dcbd Signed-off-by: Sandeep Patil <sspatil@google.com>
129 lines
3.8 KiB
C++
129 lines
3.8 KiB
C++
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <cctype>
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#include <fstream>
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#include <string>
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#include <utility>
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#include <vector>
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#include <android-base/file.h>
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#include <android-base/logging.h>
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#include <android-base/parseint.h>
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#include <android-base/strings.h>
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#include "meminfo_private.h"
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namespace android {
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namespace meminfo {
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const std::vector<std::string> SysMemInfo::kDefaultSysMemInfoTags = {
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"MemTotal:", "MemFree:", "Buffers:", "Cached:", "Shmem:",
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"Slab:", "SReclaimable:", "SUnreclaim:", "SwapTotal:", "SwapFree:",
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"ZRam:", "Mapped:", "VmallocUsed:", "PageTables:", "KernelStack:",
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};
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bool SysMemInfo::ReadMemInfo(const std::string& path) {
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return ReadMemInfo(SysMemInfo::kDefaultSysMemInfoTags, path);
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}
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// TODO: Delete this function if it can't match up with the c-like implementation below.
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// Currently, this added about 50 % extra overhead on hikey.
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#if 0
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bool SysMemInfo::ReadMemInfo(const std::vector<std::string>& tags, const std::string& path) {
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std::string buffer;
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if (!::android::base::ReadFileToString(path, &buffer)) {
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PLOG(ERROR) << "Failed to read : " << path;
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return false;
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}
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uint32_t total_found = 0;
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for (auto s = buffer.begin(); s < buffer.end() && total_found < tags.size();) {
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for (auto& tag : tags) {
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if (tag == std::string(s, s + tag.size())) {
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s += tag.size();
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while (isspace(*s)) s++;
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auto num_start = s;
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while (std::isdigit(*s)) s++;
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std::string number(num_start, num_start + (s - num_start));
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if (!::android::base::ParseUint(number, &mem_in_kb_[tag])) {
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LOG(ERROR) << "Failed to parse uint";
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return false;
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}
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total_found++;
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break;
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}
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}
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while (s < buffer.end() && *s != '\n') s++;
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if (s < buffer.end()) s++;
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}
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return true;
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}
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#else
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bool SysMemInfo::ReadMemInfo(const std::vector<std::string>& tags, const std::string& path) {
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char buffer[4096];
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int fd = open(path.c_str(), O_RDONLY | O_CLOEXEC);
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if (fd < 0) {
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PLOG(ERROR) << "Failed to open file :" << path;
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return false;
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}
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const int len = read(fd, buffer, sizeof(buffer) - 1);
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close(fd);
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if (len < 0) {
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return false;
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}
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buffer[len] = '\0';
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char* p = buffer;
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uint32_t found = 0;
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while (*p && found < tags.size()) {
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for (auto& tag : tags) {
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if (strncmp(p, tag.c_str(), tag.size()) == 0) {
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p += tag.size();
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while (*p == ' ') p++;
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char* endptr = nullptr;
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mem_in_kb_[tag] = strtoull(p, &endptr, 10);
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if (p == endptr) {
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PLOG(ERROR) << "Failed to parse line in file: " << path;
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return false;
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}
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p = endptr;
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found++;
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break;
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}
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}
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while (*p && *p != '\n') {
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p++;
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}
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if (*p) p++;
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}
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return true;
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}
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#endif
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} // namespace meminfo
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} // namespace android
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