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platform_system_core/libmeminfo/libmeminfo_benchmark.cpp
Sandeep Patil 2f0b6ebfbe libmeminfo: Add ReadSysMemInfo variants 
The new variant is primarily used in framework. See: go/ag/5780400
for usage. Also add tests, benchmarks and fix several issues found in SysMemInfo
class.

New benchmark results are:
--------------------------------------------------------------
Benchmark                       Time           CPU Iterations
--------------------------------------------------------------
BM_ReadMemInfo_old           7726 ns       7696 ns      90201
BM_ReadMemInfo_new           7554 ns       7525 ns      90358
BM_ZramTotal_old             6446 ns       6406 ns     108361
BM_ZramTotal_new             6529 ns       6488 ns     106545
BM_MemInfoWithZram_old      14485 ns      14412 ns      48492
BM_MemInfoWithZram_new      20572 ns      20459 ns      33438
--------------------------------------------------------------

The reason for BM_MemInfoWithZram_new shows worse numbers is because
the new API also tries to find more than 1 zram device (if it exists).
The old implementation hard coded everything to "/sys/block/zram0/"

Test: libmeminfo_test 1
Bug: 114325007
Bug: 111694435

Change-Id: I246d9e9a54986ee9b2542d1eaac79ecf7310b23a
Signed-off-by: Sandeep Patil <sspatil@google.com>
2018-12-11 10:38:33 -08:00

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/*
* 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>
using ::android::meminfo::SysMemInfo;
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_ReadMemInfo_old(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_ReadMemInfo_old);
static void BM_ReadMemInfo_new(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);
std::vector<uint64_t> mem(MEMINFO_COUNT);
const std::vector<std::string> tags = {
SysMemInfo::kMemTotal, SysMemInfo::kMemFree, SysMemInfo::kMemBuffers,
SysMemInfo::kMemCached, SysMemInfo::kMemShmem, SysMemInfo::kMemSlab,
SysMemInfo::kMemSReclaim, SysMemInfo::kMemSUnreclaim, SysMemInfo::kMemSwapTotal,
SysMemInfo::kMemSwapFree, SysMemInfo::kMemMapped, SysMemInfo::kMemVmallocUsed,
SysMemInfo::kMemPageTables, SysMemInfo::kMemKernelStack,
};
SysMemInfo smi;
for (auto _ : state) {
smi.ReadMemInfo(tags, &mem, file);
}
}
BENCHMARK(BM_ReadMemInfo_new);
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_ZramTotal_old(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_ZramTotal_old);
static void BM_ZramTotal_new(benchmark::State& state) {
std::string exec_dir = ::android::base::GetExecutableDirectory();
std::string zram_mmstat_dir = exec_dir + "/testdata1/";
SysMemInfo smi;
for (auto _ : state) {
uint64_t zram_total __attribute__((unused)) = smi.mem_zram_kb(zram_mmstat_dir);
}
}
BENCHMARK(BM_ZramTotal_new);
static void BM_MemInfoWithZram_old(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 exec_dir = ::android::base::GetExecutableDirectory();
std::string zram_mmstat_dir = exec_dir + "/testdata1/";
uint64_t mem[MEMINFO_COUNT];
for (auto _ : state) {
get_mem_info(mem, tf.path);
mem[MEMINFO_ZRAM_TOTAL] = get_zram_mem_used("/sys/block/zram0/") / 1024;
CHECK_EQ(mem[MEMINFO_KERNEL_STACK], 4880u);
}
}
BENCHMARK(BM_MemInfoWithZram_old);
static void BM_MemInfoWithZram_new(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);
std::vector<uint64_t> mem(MEMINFO_COUNT);
std::vector<std::string> tags(SysMemInfo::kDefaultSysMemInfoTags);
auto it = tags.begin();
tags.insert(it + MEMINFO_ZRAM_TOTAL, "Zram:");
SysMemInfo smi;
for (auto _ : state) {
smi.ReadMemInfo(tags, &mem, file);
CHECK_EQ(mem[MEMINFO_KERNEL_STACK], 4880u);
}
}
BENCHMARK(BM_MemInfoWithZram_new);
BENCHMARK_MAIN();
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