| /* |
| * Copyright (C) 2018 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <meminfo/sysmeminfo.h> |
| |
| #include <fcntl.h> |
| #include <inttypes.h> |
| #include <stdio.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| |
| #include <string> |
| |
| #include <android-base/file.h> |
| #include <android-base/logging.h> |
| |
| #include <benchmark/benchmark.h> |
| |
| enum { |
| MEMINFO_TOTAL, |
| MEMINFO_FREE, |
| MEMINFO_BUFFERS, |
| MEMINFO_CACHED, |
| MEMINFO_SHMEM, |
| MEMINFO_SLAB, |
| MEMINFO_SLAB_RECLAIMABLE, |
| MEMINFO_SLAB_UNRECLAIMABLE, |
| MEMINFO_SWAP_TOTAL, |
| MEMINFO_SWAP_FREE, |
| MEMINFO_ZRAM_TOTAL, |
| MEMINFO_MAPPED, |
| MEMINFO_VMALLOC_USED, |
| MEMINFO_PAGE_TABLES, |
| MEMINFO_KERNEL_STACK, |
| MEMINFO_COUNT |
| }; |
| |
| static void get_mem_info(uint64_t mem[], const char* file) { |
| char buffer[4096]; |
| unsigned int numFound = 0; |
| |
| int fd = open(file, O_RDONLY); |
| |
| if (fd < 0) { |
| printf("Unable to open %s: %s\n", file, strerror(errno)); |
| return; |
| } |
| |
| const int len = read(fd, buffer, sizeof(buffer) - 1); |
| close(fd); |
| |
| if (len < 0) { |
| printf("Empty %s\n", file); |
| return; |
| } |
| buffer[len] = 0; |
| |
| static const char* const tags[] = { |
| "MemTotal:", "MemFree:", "Buffers:", "Cached:", "Shmem:", "Slab:", |
| "SReclaimable:", "SUnreclaim:", "SwapTotal:", "SwapFree:", "ZRam:", "Mapped:", |
| "VmallocUsed:", "PageTables:", "KernelStack:", NULL |
| }; |
| |
| static const int tagsLen[] = {9, 8, 8, 7, 6, 5, 13, 11, 10, 9, 5, 7, 12, 11, 12, 0}; |
| |
| memset(mem, 0, sizeof(uint64_t) * 15); |
| char* p = buffer; |
| while (*p && (numFound < (sizeof(tagsLen) / sizeof(tagsLen[0])))) { |
| int i = 0; |
| while (tags[i]) { |
| // std::cout << "tag =" << tags[i] << " p = " << std::string(p, tagsLen[i]) << |
| // std::endl; |
| if (strncmp(p, tags[i], tagsLen[i]) == 0) { |
| p += tagsLen[i]; |
| while (*p == ' ') p++; |
| char* num = p; |
| while (*p >= '0' && *p <= '9') p++; |
| if (*p != 0) { |
| *p = 0; |
| p++; |
| } |
| mem[i] = atoll(num); |
| numFound++; |
| break; |
| } |
| i++; |
| } |
| while (*p && *p != '\n') { |
| p++; |
| } |
| if (*p) p++; |
| } |
| } |
| |
| static void BM_ParseSysMemInfo(benchmark::State& state) { |
| std::string meminfo = R"meminfo(MemTotal: 3019740 kB |
| MemFree: 1809728 kB |
| MemAvailable: 2546560 kB |
| Buffers: 54736 kB |
| Cached: 776052 kB |
| SwapCached: 0 kB |
| Active: 445856 kB |
| Inactive: 459092 kB |
| Active(anon): 78492 kB |
| Inactive(anon): 2240 kB |
| Active(file): 367364 kB |
| Inactive(file): 456852 kB |
| Unevictable: 3096 kB |
| Mlocked: 3096 kB |
| SwapTotal: 0 kB |
| SwapFree: 0 kB |
| Dirty: 32 kB |
| Writeback: 0 kB |
| AnonPages: 74988 kB |
| Mapped: 62624 kB |
| Shmem: 4020 kB |
| Slab: 86464 kB |
| SReclaimable: 44432 kB |
| SUnreclaim: 42032 kB |
| KernelStack: 4880 kB |
| PageTables: 2900 kB |
| NFS_Unstable: 0 kB |
| Bounce: 0 kB |
| WritebackTmp: 0 kB |
| CommitLimit: 1509868 kB |
| Committed_AS: 80296 kB |
| VmallocTotal: 263061440 kB |
| VmallocUsed: 0 kB |
| VmallocChunk: 0 kB |
| AnonHugePages: 6144 kB |
| ShmemHugePages: 0 kB |
| ShmemPmdMapped: 0 kB |
| CmaTotal: 131072 kB |
| CmaFree: 130380 kB |
| HugePages_Total: 0 |
| HugePages_Free: 0 |
| HugePages_Rsvd: 0 |
| HugePages_Surp: 0 |
| Hugepagesize: 2048 kB)meminfo"; |
| |
| TemporaryFile tf; |
| ::android::base::WriteStringToFd(meminfo, tf.fd); |
| |
| uint64_t mem[MEMINFO_COUNT]; |
| for (auto _ : state) { |
| get_mem_info(mem, tf.path); |
| } |
| } |
| BENCHMARK(BM_ParseSysMemInfo); |
| |
| static void BM_ReadMemInfo(benchmark::State& state) { |
| std::string meminfo = R"meminfo(MemTotal: 3019740 kB |
| MemFree: 1809728 kB |
| MemAvailable: 2546560 kB |
| Buffers: 54736 kB |
| Cached: 776052 kB |
| SwapCached: 0 kB |
| Active: 445856 kB |
| Inactive: 459092 kB |
| Active(anon): 78492 kB |
| Inactive(anon): 2240 kB |
| Active(file): 367364 kB |
| Inactive(file): 456852 kB |
| Unevictable: 3096 kB |
| Mlocked: 3096 kB |
| SwapTotal: 0 kB |
| SwapFree: 0 kB |
| Dirty: 32 kB |
| Writeback: 0 kB |
| AnonPages: 74988 kB |
| Mapped: 62624 kB |
| Shmem: 4020 kB |
| Slab: 86464 kB |
| SReclaimable: 44432 kB |
| SUnreclaim: 42032 kB |
| KernelStack: 4880 kB |
| PageTables: 2900 kB |
| NFS_Unstable: 0 kB |
| Bounce: 0 kB |
| WritebackTmp: 0 kB |
| CommitLimit: 1509868 kB |
| Committed_AS: 80296 kB |
| VmallocTotal: 263061440 kB |
| VmallocUsed: 0 kB |
| VmallocChunk: 0 kB |
| AnonHugePages: 6144 kB |
| ShmemHugePages: 0 kB |
| ShmemPmdMapped: 0 kB |
| CmaTotal: 131072 kB |
| CmaFree: 130380 kB |
| HugePages_Total: 0 |
| HugePages_Free: 0 |
| HugePages_Rsvd: 0 |
| HugePages_Surp: 0 |
| Hugepagesize: 2048 kB)meminfo"; |
| |
| TemporaryFile tf; |
| android::base::WriteStringToFd(meminfo, tf.fd); |
| |
| std::string file = std::string(tf.path); |
| ::android::meminfo::SysMemInfo mi; |
| for (auto _ : state) { |
| mi.ReadMemInfo(file); |
| } |
| } |
| BENCHMARK(BM_ReadMemInfo); |
| |
| static uint64_t get_zram_mem_used(const std::string& zram_dir) { |
| FILE* f = fopen((zram_dir + "mm_stat").c_str(), "r"); |
| if (f) { |
| uint64_t mem_used_total = 0; |
| |
| int matched = fscanf(f, "%*d %*d %" SCNu64 " %*d %*d %*d %*d", &mem_used_total); |
| if (matched != 1) |
| fprintf(stderr, "warning: failed to parse %s\n", (zram_dir + "mm_stat").c_str()); |
| |
| fclose(f); |
| return mem_used_total; |
| } |
| |
| f = fopen((zram_dir + "mem_used_total").c_str(), "r"); |
| if (f) { |
| uint64_t mem_used_total = 0; |
| |
| int matched = fscanf(f, "%" SCNu64, &mem_used_total); |
| if (matched != 1) |
| fprintf(stderr, "warning: failed to parse %s\n", (zram_dir + "mem_used_total").c_str()); |
| |
| fclose(f); |
| return mem_used_total; |
| } |
| |
| return 0; |
| } |
| |
| static void BM_OldReadZramTotal(benchmark::State& state) { |
| std::string exec_dir = ::android::base::GetExecutableDirectory(); |
| std::string zram_mmstat_dir = exec_dir + "/testdata1/"; |
| for (auto _ : state) { |
| uint64_t zram_total __attribute__((unused)) = get_zram_mem_used(zram_mmstat_dir) / 1024; |
| } |
| } |
| BENCHMARK(BM_OldReadZramTotal); |
| |
| static void BM_NewReadZramTotal(benchmark::State& state) { |
| std::string exec_dir = ::android::base::GetExecutableDirectory(); |
| std::string zram_mmstat_dir = exec_dir + "/testdata1/"; |
| ::android::meminfo::SysMemInfo mi; |
| for (auto _ : state) { |
| uint64_t zram_total __attribute__((unused)) = mi.mem_zram_kb(zram_mmstat_dir); |
| } |
| } |
| BENCHMARK(BM_NewReadZramTotal); |
| |
| BENCHMARK_MAIN(); |