Sandeep Patil | 54d8721 | 2018-08-29 17:10:47 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2018 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include <errno.h> |
| 18 | #include <fcntl.h> |
| 19 | #include <inttypes.h> |
| 20 | #include <linux/kernel-page-flags.h> |
| 21 | #include <stdio.h> |
| 22 | #include <unistd.h> |
| 23 | |
| 24 | #include <fstream> |
| 25 | #include <iostream> |
| 26 | #include <memory> |
| 27 | #include <string> |
| 28 | #include <utility> |
| 29 | |
| 30 | #include <android-base/file.h> |
| 31 | #include <android-base/logging.h> |
| 32 | #include <android-base/stringprintf.h> |
| 33 | #include <android-base/unique_fd.h> |
| 34 | #include <procinfo/process_map.h> |
| 35 | |
| 36 | #include "meminfo_private.h" |
| 37 | |
| 38 | namespace android { |
| 39 | namespace meminfo { |
| 40 | |
| 41 | static void add_mem_usage(MemUsage* to, const MemUsage& from) { |
| 42 | to->vss += from.vss; |
| 43 | to->rss += from.rss; |
| 44 | to->pss += from.pss; |
| 45 | to->uss += from.uss; |
| 46 | |
| 47 | to->private_clean += from.private_clean; |
| 48 | to->private_dirty += from.private_dirty; |
| 49 | |
| 50 | to->shared_clean += from.shared_clean; |
| 51 | to->shared_dirty += from.shared_dirty; |
| 52 | } |
| 53 | |
| 54 | ProcMemInfo::ProcMemInfo(pid_t pid, bool get_wss) : pid_(pid), get_wss_(get_wss) { |
| 55 | if (!ReadMaps(get_wss_)) { |
| 56 | LOG(ERROR) << "Failed to read maps for Process " << pid_; |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | const std::vector<Vma>& ProcMemInfo::Maps() { |
| 61 | return maps_; |
| 62 | } |
| 63 | |
| 64 | const MemUsage& ProcMemInfo::Usage() { |
| 65 | if (get_wss_) { |
| 66 | LOG(WARNING) << "Trying to read memory usage from working set object"; |
| 67 | } |
| 68 | return usage_; |
| 69 | } |
| 70 | |
| 71 | const MemUsage& ProcMemInfo::Wss() { |
| 72 | if (!get_wss_) { |
| 73 | LOG(WARNING) << "Trying to read working set when there is none"; |
| 74 | } |
| 75 | |
| 76 | return wss_; |
| 77 | } |
| 78 | |
| 79 | bool ProcMemInfo::WssReset() { |
| 80 | if (!get_wss_) { |
| 81 | LOG(ERROR) << "Trying to reset working set from a memory usage counting object"; |
| 82 | return false; |
| 83 | } |
| 84 | |
| 85 | std::string clear_refs_path = ::android::base::StringPrintf("/proc/%d/clear_refs", pid_); |
| 86 | if (!::android::base::WriteStringToFile("1\n", clear_refs_path)) { |
| 87 | PLOG(ERROR) << "Failed to write to " << clear_refs_path; |
| 88 | return false; |
| 89 | } |
| 90 | |
| 91 | wss_.clear(); |
| 92 | return true; |
| 93 | } |
| 94 | |
| 95 | bool ProcMemInfo::ReadMaps(bool get_wss) { |
| 96 | // parse and read /proc/<pid>/maps |
| 97 | std::string maps_file = ::android::base::StringPrintf("/proc/%d/maps", pid_); |
| 98 | if (!::android::procinfo::ReadMapFile( |
| 99 | maps_file, [&](uint64_t start, uint64_t end, uint16_t flags, uint64_t pgoff, |
| 100 | const char* name) { |
| 101 | maps_.emplace_back(Vma(start, end, pgoff, flags, name)); |
| 102 | })) { |
| 103 | LOG(ERROR) << "Failed to parse " << maps_file; |
| 104 | maps_.clear(); |
| 105 | return false; |
| 106 | } |
| 107 | |
| 108 | std::string pagemap_file = ::android::base::StringPrintf("/proc/%d/pagemap", pid_); |
| 109 | ::android::base::unique_fd pagemap_fd( |
| 110 | TEMP_FAILURE_RETRY(open(pagemap_file.c_str(), O_RDONLY | O_CLOEXEC))); |
| 111 | if (pagemap_fd < 0) { |
| 112 | PLOG(ERROR) << "Failed to open " << pagemap_file; |
| 113 | return false; |
| 114 | } |
| 115 | |
| 116 | for (auto& vma : maps_) { |
| 117 | if (!ReadVmaStats(pagemap_fd.get(), vma, get_wss)) { |
| 118 | LOG(ERROR) << "Failed to read page map for vma " << vma.name << "[" << vma.start |
| 119 | << "-" << vma.end << "]"; |
| 120 | maps_.clear(); |
| 121 | return false; |
| 122 | } |
| 123 | if (get_wss) { |
| 124 | add_mem_usage(&wss_, vma.wss); |
| 125 | } else { |
| 126 | add_mem_usage(&usage_, vma.usage); |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | return true; |
| 131 | } |
| 132 | |
| 133 | bool ProcMemInfo::ReadVmaStats(int pagemap_fd, Vma& vma, bool get_wss) { |
| 134 | PageAcct& pinfo = PageAcct::Instance(); |
| 135 | uint64_t pagesz = getpagesize(); |
| 136 | uint64_t num_pages = (vma.end - vma.start) / pagesz; |
| 137 | |
| 138 | std::unique_ptr<uint64_t[]> pg_frames(new uint64_t[num_pages]); |
| 139 | uint64_t first = vma.start / pagesz; |
| 140 | if (pread64(pagemap_fd, pg_frames.get(), num_pages * sizeof(uint64_t), |
| 141 | first * sizeof(uint64_t)) < 0) { |
| 142 | PLOG(ERROR) << "Failed to read page frames from page map for pid: " << pid_; |
| 143 | return false; |
| 144 | } |
| 145 | |
| 146 | std::unique_ptr<uint64_t[]> pg_flags(new uint64_t[num_pages]); |
| 147 | std::unique_ptr<uint64_t[]> pg_counts(new uint64_t[num_pages]); |
| 148 | for (uint64_t i = 0; i < num_pages; ++i) { |
| 149 | if (!get_wss) { |
| 150 | vma.usage.vss += pagesz; |
| 151 | } |
| 152 | uint64_t p = pg_frames[i]; |
| 153 | if (!PAGE_PRESENT(p) && !PAGE_SWAPPED(p)) continue; |
| 154 | |
| 155 | if (PAGE_SWAPPED(p)) { |
| 156 | // TODO: do what's needed for swapped pages |
| 157 | continue; |
| 158 | } |
| 159 | |
| 160 | uint64_t page_frame = PAGE_PFN(p); |
| 161 | if (!pinfo.PageFlags(page_frame, &pg_flags[i])) { |
| 162 | LOG(ERROR) << "Failed to get page flags for " << page_frame << " in process " << pid_; |
| 163 | return false; |
| 164 | } |
| 165 | |
| 166 | if (!pinfo.PageMapCount(page_frame, &pg_counts[i])) { |
| 167 | LOG(ERROR) << "Failed to get page count for " << page_frame << " in process " << pid_; |
| 168 | return false; |
| 169 | } |
| 170 | |
| 171 | // Page was unmapped between the presence check at the beginning of the loop and here. |
| 172 | if (pg_counts[i] == 0) { |
| 173 | pg_frames[i] = 0; |
| 174 | pg_flags[i] = 0; |
| 175 | continue; |
| 176 | } |
| 177 | |
| 178 | bool is_dirty = !!(pg_flags[i] & (1 << KPF_DIRTY)); |
| 179 | bool is_private = (pg_counts[i] == 1); |
| 180 | // Working set |
| 181 | if (get_wss) { |
| 182 | bool is_referenced = !!(pg_flags[i] & (1 << KPF_REFERENCED)); |
| 183 | if (!is_referenced) { |
| 184 | continue; |
| 185 | } |
| 186 | // This effectively makes vss = rss for the working set is requested. |
| 187 | // The libpagemap implementation returns vss > rss for |
| 188 | // working set, which doesn't make sense. |
| 189 | vma.wss.vss += pagesz; |
| 190 | vma.wss.rss += pagesz; |
| 191 | vma.wss.uss += is_private ? pagesz : 0; |
| 192 | vma.wss.pss += pagesz / pg_counts[i]; |
| 193 | if (is_private) { |
| 194 | vma.wss.private_dirty += is_dirty ? pagesz : 0; |
| 195 | vma.wss.private_clean += is_dirty ? 0 : pagesz; |
| 196 | } else { |
| 197 | vma.wss.shared_dirty += is_dirty ? pagesz : 0; |
| 198 | vma.wss.shared_clean += is_dirty ? 0 : pagesz; |
| 199 | } |
| 200 | } else { |
| 201 | vma.usage.rss += pagesz; |
| 202 | vma.usage.uss += is_private ? pagesz : 0; |
| 203 | vma.usage.pss += pagesz / pg_counts[i]; |
| 204 | if (is_private) { |
| 205 | vma.usage.private_dirty += is_dirty ? pagesz : 0; |
| 206 | vma.usage.private_clean += is_dirty ? 0 : pagesz; |
| 207 | } else { |
| 208 | vma.usage.shared_dirty += is_dirty ? pagesz : 0; |
| 209 | vma.usage.shared_clean += is_dirty ? 0 : pagesz; |
| 210 | } |
| 211 | } |
| 212 | } |
| 213 | |
| 214 | return true; |
| 215 | } |
| 216 | |
| 217 | } // namespace meminfo |
| 218 | } // namespace android |