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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 "src/traced/probes/ftrace/cpu_stats_parser.h"
#include "perfetto/base/string_splitter.h"
#include "perfetto/base/string_utils.h"
#include "src/traced/probes/ftrace/ftrace_controller.h"
#include "src/traced/probes/ftrace/ftrace_procfs.h"
#include "src/traced/probes/ftrace/ftrace_stats.h"
namespace perfetto {
namespace {
uint32_t ExtractInt(const char* s) {
for (; *s != '\0'; s++) {
if (*s == ':') {
return static_cast<uint32_t>(atoi(s + 1));
}
}
return 0;
}
double ExtractDouble(const char* s) {
for (; *s != '\0'; s++) {
if (*s == ':') {
return strtod(s + 1, nullptr);
}
}
return 0;
}
} // namespace
bool DumpCpuStats(std::string text, FtraceCpuStats* stats) {
if (text.empty())
return false;
base::StringSplitter splitter(std::move(text), '\n');
while (splitter.Next()) {
if (base::StartsWith(splitter.cur_token(), "entries")) {
stats->entries = ExtractInt(splitter.cur_token());
} else if (base::StartsWith(splitter.cur_token(), "overrun")) {
stats->overrun = ExtractInt(splitter.cur_token());
} else if (base::StartsWith(splitter.cur_token(), "commit overrun")) {
stats->commit_overrun = ExtractInt(splitter.cur_token());
} else if (base::StartsWith(splitter.cur_token(), "bytes")) {
stats->bytes_read = ExtractInt(splitter.cur_token());
} else if (base::StartsWith(splitter.cur_token(), "oldest event ts")) {
stats->oldest_event_ts = ExtractDouble(splitter.cur_token());
} else if (base::StartsWith(splitter.cur_token(), "now ts")) {
stats->now_ts = ExtractDouble(splitter.cur_token());
} else if (base::StartsWith(splitter.cur_token(), "dropped events")) {
stats->dropped_events = ExtractInt(splitter.cur_token());
} else if (base::StartsWith(splitter.cur_token(), "read events")) {
stats->read_events = ExtractInt(splitter.cur_token());
}
}
return true;
}
bool DumpAllCpuStats(FtraceProcfs* ftrace, FtraceStats* stats) {
stats->cpu_stats.resize(ftrace->NumberOfCpus(), {});
for (size_t cpu = 0; cpu < ftrace->NumberOfCpus(); cpu++) {
stats->cpu_stats[cpu].cpu = cpu;
if (!DumpCpuStats(ftrace->ReadCpuStats(cpu), &stats->cpu_stats[cpu]))
return false;
}
return true;
}
} // namespace perfetto
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