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 "src/ftrace_reader/cpu_stats_parser.h"
18
19 #include "perfetto/base/string_splitter.h"
20 #include "perfetto/base/string_utils.h"
21 #include "perfetto/ftrace_reader/ftrace_controller.h"
22 #include "src/ftrace_reader/ftrace_procfs.h"
23
24 namespace perfetto {
25 namespace {
26
ExtractInt(const char * s)27 uint32_t ExtractInt(const char* s) {
28 for (; *s != '\0'; s++) {
29 if (*s == ':') {
30 return static_cast<uint32_t>(atoi(s + 1));
31 }
32 }
33 return 0;
34 }
35
ExtractDouble(const char * s)36 double ExtractDouble(const char* s) {
37 for (; *s != '\0'; s++) {
38 if (*s == ':') {
39 return strtod(s + 1, nullptr);
40 }
41 }
42 return 0;
43 }
44
45 } // namespace
46
DumpCpuStats(std::string text,FtraceCpuStats * stats)47 bool DumpCpuStats(std::string text, FtraceCpuStats* stats) {
48 if (text.empty())
49 return false;
50
51 base::StringSplitter splitter(std::move(text), '\n');
52 while (splitter.Next()) {
53 if (base::StartsWith(splitter.cur_token(), "entries")) {
54 stats->entries = ExtractInt(splitter.cur_token());
55 } else if (base::StartsWith(splitter.cur_token(), "overrun")) {
56 stats->overrun = ExtractInt(splitter.cur_token());
57 } else if (base::StartsWith(splitter.cur_token(), "commit overrun")) {
58 stats->commit_overrun = ExtractInt(splitter.cur_token());
59 } else if (base::StartsWith(splitter.cur_token(), "bytes")) {
60 stats->bytes_read = ExtractInt(splitter.cur_token());
61 } else if (base::StartsWith(splitter.cur_token(), "oldest event ts")) {
62 stats->oldest_event_ts = ExtractDouble(splitter.cur_token());
63 } else if (base::StartsWith(splitter.cur_token(), "now ts")) {
64 stats->now_ts = ExtractDouble(splitter.cur_token());
65 } else if (base::StartsWith(splitter.cur_token(), "dropped events")) {
66 stats->dropped_events = ExtractInt(splitter.cur_token());
67 } else if (base::StartsWith(splitter.cur_token(), "read events")) {
68 stats->read_events = ExtractInt(splitter.cur_token());
69 }
70 }
71
72 return true;
73 }
74
DumpAllCpuStats(FtraceProcfs * ftrace,FtraceStats * stats)75 bool DumpAllCpuStats(FtraceProcfs* ftrace, FtraceStats* stats) {
76 stats->cpu_stats.resize(ftrace->NumberOfCpus(), {});
77 for (size_t cpu = 0; cpu < ftrace->NumberOfCpus(); cpu++) {
78 stats->cpu_stats[cpu].cpu = cpu;
79 if (!DumpCpuStats(ftrace->ReadCpuStats(cpu), &stats->cpu_stats[cpu]))
80 return false;
81 }
82 return true;
83 }
84
85 } // namespace perfetto
86