boottime_tools/bootio/bootio_collector.cpp - platform/system/extras - Git at Google

 /*
  * Copyright (C) 2016 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 "bootio_collector.h"

 #include <android-base/file.h>
 #include <android-base/logging.h>
 #include <dirent.h>
 #include <inttypes.h>
 #include <log/log.h>

 #include <map>
 #include <memory>
 #include <string>
 #include <unordered_map>

 #include "protos.pb.h"
 #include "time.h"

 namespace android {

 #define CPU_STAT_FILE "/proc/stat"
 #define SAMPLES_FILE "/samples"
 #define PID_STAT_FILE "/proc/%d/stat"
 #define PID_CMDLINE_FILE "/proc/%d/cmdline"
 #define PID_IO_FILE "/proc/%d/io"
 #define PROC_DIR "/proc"

 static const int MAX_LINE = 256;

 #define die(...) { LOG(ERROR) << (__VA_ARGS__); exit(EXIT_FAILURE); }

 void PopulateCpu(CpuData& cpu) {
     long unsigned utime, ntime, stime, itime;
     long unsigned iowtime, irqtime, sirqtime;
     FILE *file;
     file = fopen(CPU_STAT_FILE, "r");
     if (!file) die("Could not open /proc/stat.\n");
     fscanf(file, "cpu  %lu %lu %lu %lu %lu %lu %lu", &utime, &ntime, &stime,
            &itime, &iowtime, &irqtime, &sirqtime);
     fclose(file);
     cpu.set_utime(utime);
     cpu.set_ntime(ntime);
     cpu.set_stime(stime);
     cpu.set_itime(itime);
     cpu.set_iowtime(iowtime);
     cpu.set_irqtime(irqtime);
     cpu.set_sirqtime(sirqtime);
 }

 void ClearPreviousResults(std::string path) {
     std::string err;
     if (!android::base::RemoveFileIfExists(path, &err)) {
         LOG(ERROR) << "failed to remove the file " << path << " " << err;
         return;
     }
 }

 int ReadIo(char *filename, AppSample *sample) {
     FILE *file;
     char line[MAX_LINE];
     unsigned int rchar = 0;
     unsigned int wchar = 0;
     unsigned int syscr = 0;
     unsigned int syscw = 0;
     unsigned int readbytes = 0;
     unsigned int writebytes = 0;

     file = fopen(filename, "r");
     if (!file) return 1;
     while (fgets(line, MAX_LINE, file)) {
         sscanf(line, "rchar: %u", &rchar);
         sscanf(line, "wchar: %u", &wchar);
         sscanf(line, "syscr: %u", &syscr);
         sscanf(line, "syscw: %u", &syscw);
         sscanf(line, "read_bytes: %u", &readbytes);
         sscanf(line, "write_bytes: %u", &writebytes);
     }
     fclose(file);
     sample->set_rchar(rchar);
     sample->set_wchar(wchar);
     sample->set_syscr(syscr);
     sample->set_syscw(syscw);
     sample->set_readbytes(readbytes);
     sample->set_writebytes(writebytes);
     return 0;
 }

 int ReadStatForName(char *filename, AppData *app) {
     FILE *file;
     char buf[MAX_LINE], *open_paren, *close_paren;

     file = fopen(filename, "r");
     if (!file) return 1;
     fgets(buf, MAX_LINE, file);
     fclose(file);

     /* Split at first '(' and last ')' to get process name. */
     open_paren = strchr(buf, '(');
     close_paren = strrchr(buf, ')');
     if (!open_paren || !close_paren) return 1;

     *open_paren = *close_paren = '\0';
     if (!app->has_tname()) {
         app->set_tname(open_paren + 1, close_paren - open_paren - 1);
     }
     return 0;
 }

 int ReadStat(char *filename, AppSample *sample) {
     FILE *file;
     char buf[MAX_LINE], *open_paren, *close_paren;

     file = fopen(filename, "r");
     if (!file) return 1;
     fgets(buf, MAX_LINE, file);
     fclose(file);

     /* Split at first '(' and last ')' to get process name. */
     open_paren = strchr(buf, '(');
     close_paren = strrchr(buf, ')');
     if (!open_paren || !close_paren) return 1;

     uint64_t utime;
     uint64_t stime;
     uint64_t rss;

     /* Scan rest of string. */
     sscanf(close_paren + 1,
            " %*c " "%*d %*d %*d %*d %*d %*d %*d %*d %*d %*d "
                    "%" PRIu64 /*SCNu64*/
                    "%" PRIu64 /*SCNu64*/ "%*d %*d %*d %*d %*d %*d %*d %*d "
                    "%" PRIu64 /*SCNu64*/ "%*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d",
            &utime,
            &stime,
            &rss);
     sample->set_utime(utime);
     sample->set_stime(stime);
     sample->set_rss(rss);

     return 0;
 }

 int ReadCmdline(char *filename, AppData *app) {
     FILE *file;
     char line[MAX_LINE];

     line[0] = '\0';
     file = fopen(filename, "r");
     if (!file) return 1;
     fgets(line, MAX_LINE, file);
     fclose(file);
     if (strlen(line) > 0) {
         app->set_name(line, strlen(line));
     } else {
         app->set_name("N/A");
     }
     return 0;
 };

 void ReadProcData(std::unordered_map<int, AppData*>& pidDataMap, DataContainer& dataContainer,
                   time_t currentTimeUtc, time_t currentUptime) {
     DIR *procDir;
     struct dirent *pidDir;
     pid_t pid;
     char filename[64];
     procDir = opendir(PROC_DIR);
     if (!procDir) die("Could not open /proc.\n");
     while ((pidDir = readdir(procDir))) {
         if (!isdigit(pidDir->d_name[0])) {
             continue;
         }
         pid = atoi(pidDir->d_name);
         AppData *data;

         // TODO: in theory same pid can be shared for multiple processes,
         // might need add extra check.
         if (pidDataMap.count(pid) == 0) {
             data = dataContainer.add_app();
             data->set_pid(pid);
             sprintf(filename, PID_STAT_FILE, pid);
             ReadStatForName(filename, data);
             sprintf(filename, PID_CMDLINE_FILE, pid);
             ReadCmdline(filename, data);
             pidDataMap[pid] = data;
         } else {
             data = pidDataMap[pid];
         }
         AppSample *sample = data->add_samples();
         sample->set_timestamp(currentTimeUtc);
         sample->set_uptime(currentUptime);

         sprintf(filename, PID_STAT_FILE, pid);
         ReadStat(filename, sample);

         sprintf(filename, PID_IO_FILE, pid);
         ReadIo(filename, sample);
     }
 }

 uint64_t SumCpuValues(CpuData& cpu) {
     return cpu.utime() + cpu.ntime() + cpu.stime() + cpu.itime() + cpu.iowtime() +
            cpu.irqtime() + cpu.sirqtime();
 }

 time_t GetUptime() {
     std::string uptime_str;
     if (!android::base::ReadFileToString("/proc/uptime", &uptime_str)) {
         LOG(ERROR) << "Failed to read /proc/uptime";
         return -1;
     }

     // Cast intentionally rounds down.
     return static_cast<time_t>(strtod(uptime_str.c_str(), NULL));
 }

 struct Stats {
     int uptime;
     float cpu;
     uint64_t rbytes;
     uint64_t wbytes;
 };

 void PrintPids(DataContainer& data, std::unordered_map<int, uint64_t>& cpuDataMap) {
     printf("rchar: number of bytes the process read, using any read-like system call "
                    "(from files, pipes, tty...).\n");
     printf("wchar: number of bytes the process wrote using any write-like system call.\n");
     printf("wchar: number of bytes the process wrote using any write-like system call.\n");
     printf("syscr: number of write-like system call invocations that the process performed.\n");
     printf("rbytes: number of bytes the process directly read from disk.\n");
     printf("wbytes: number of bytes the process originally dirtied in the page-cache "
                    "(assuming they will go to disk later).\n\n");

     std::unique_ptr<AppSample> bootZeroSample(new AppSample());
     std::map<int, Stats> statsMap;
     // Init stats map
     Stats emptyStat {0, 0., 0, 0};
     for (auto it = cpuDataMap.begin(); it != cpuDataMap.end(); it++) {
         statsMap[it->first] = emptyStat;
     }
     for (int i = 0; i < data.app_size(); i++) {
         const AppData appData = data.app(i);
         printf("\n-----------------------------------------------------------------------------\n");
         printf("PID:\t%u\n", appData.pid());
         printf("Name:\t%s\n", appData.name().c_str());
         printf("ThName:\t%s\n", appData.tname().c_str());
         printf("%-15s%-13s%-13s%-13s%-13s%-13s%-13s%-13s\n", "Uptime inter.", "rchar", "wchar",
                "syscr", "syscw", "rbytes", "wbytes", "cpu%");
         const AppSample *olderSample = NULL;
         const AppSample *newerSample = NULL;
         bool isFirstSample = true;
         for (int j = 0; j < appData.samples_size(); j++) {
             olderSample = newerSample;
             newerSample = &(appData.samples(j));
             if (olderSample == NULL) {
                 olderSample = bootZeroSample.get();
             }
             float cpuLoad = 0.;
             uint64_t cpuDelta;
             if (isFirstSample) {
                 cpuDelta = cpuDataMap[newerSample->timestamp()];
             } else {
                 cpuDelta = cpuDataMap[newerSample->timestamp()] -
                         cpuDataMap[olderSample->timestamp()];
             }
             if (cpuDelta != 0) {
                 cpuLoad = (newerSample->utime() - olderSample->utime() +
                            newerSample->stime() - olderSample->stime()) * 100. / cpuDelta;
             }
             Stats& stats = statsMap[newerSample->timestamp()];
             stats.uptime = newerSample->uptime();
             stats.cpu += cpuLoad;
             stats.rbytes += (newerSample->readbytes() - olderSample->readbytes());
             stats.wbytes += (newerSample->writebytes() - olderSample->writebytes());

 #define NUMBER "%-13" PRId64
             printf("%5" PRId64 " - %-5" PRId64 "  " NUMBER NUMBER NUMBER NUMBER NUMBER NUMBER "%-9.2f\n",
 #undef NUMBER
                    olderSample->uptime(),
                    newerSample->uptime(),
                    newerSample->rchar() - olderSample->rchar(),
                    newerSample->wchar() - olderSample->wchar(),
                    newerSample->syscr() - olderSample->syscr(),
                    newerSample->syscw() - olderSample->syscw(),
                    newerSample->readbytes() - olderSample->readbytes(),
                    newerSample->writebytes() - olderSample->writebytes(),
                    cpuLoad);
             isFirstSample = false;
         }
         if (!newerSample) {
             LOG(ERROR) << "newerSample is null";
         } else {
             printf("-----------------------------------------------------------------------------"
                    "\n");
 #define NUMBER "%-13" PRId64
             printf("%-15s" NUMBER NUMBER NUMBER NUMBER NUMBER NUMBER "\n",
 #undef NUMBER
                    "Total", newerSample->rchar(), newerSample->wchar(), newerSample->syscr(),
                    newerSample->syscw(), newerSample->readbytes(), newerSample->writebytes());
         }
     }
     printf("\nAggregations\n%-10s%-13s%-13s%-13s\n",
            "Total",
            "rbytes",
            "wbytes",
            "cpu%");

     for (auto it = statsMap.begin(); it != statsMap.end(); it++) {
         printf("%-10u%-13" PRIu64 "%-13" PRIu64 "%-9.2f\n",
                it->second.uptime,
                it->second.rbytes,
                it->second.wbytes,
                it->second.cpu);
     }
 }

 }

 BootioCollector::BootioCollector(std::string path) {
     DCHECK_EQ('/', path.back());
     path_ = path;
 }

 void BootioCollector::StartDataCollection(int timeout, int samples) {
     android::ClearPreviousResults(getStoragePath());
     int remaining = samples + 1;
     int delayS = timeout / samples;

     std::unordered_map < int, AppData * > pidDataMap;
     std::unique_ptr <DataContainer> data(new DataContainer());
     while (remaining > 0) {
         time_t currentTimeUtc = time(nullptr);
         time_t currentUptime = android::GetUptime();
         CpuData *cpu = data->add_cpu();
         cpu->set_timestamp(currentTimeUtc);
         cpu->set_uptime(currentUptime);
         android::PopulateCpu(*cpu);
         android::ReadProcData(pidDataMap, *data.get(), currentTimeUtc, currentUptime);
         remaining--;
         if (remaining == 0) {
             continue;
         }
         sleep(delayS);
     }
     std::string file_data;
     if (!data->SerializeToString(&file_data)) {
         LOG(ERROR) << "Failed to serialize";
         return;
     }
     if (!android::base::WriteStringToFile(file_data, getStoragePath())) {
         LOG(ERROR) << "Failed to write samples";
     }
 }

 void BootioCollector::Print() {
     std::string file_data;
     if (!android::base::ReadFileToString(getStoragePath(), &file_data)) {
         printf("Failed to read data from file.\n");
         return;
     }
     std::unique_ptr <DataContainer> data(new DataContainer());
     if (!data->ParsePartialFromString(file_data)) {
         printf("Failed to parse data.\n");
         return;
     }
     std::unordered_map<int, uint64_t> cpuDataMap;
     for (int i = 0; i < data->cpu_size(); i++) {
         CpuData cpu_data = data->cpu(i);
         cpuDataMap[cpu_data.timestamp()] = android::SumCpuValues(cpu_data);
     }
     android::PrintPids(*data.get(), cpuDataMap);
 }


 std::string BootioCollector::getStoragePath() {
     return path_ + SAMPLES_FILE;
 }
	/*
	* Copyright (C) 2016 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 "bootio_collector.h"

	#include <android-base/file.h>
	#include <android-base/logging.h>
	#include <dirent.h>
	#include <inttypes.h>
	#include <log/log.h>

	#include <map>
	#include <memory>
	#include <string>
	#include <unordered_map>

	#include "protos.pb.h"
	#include "time.h"

	namespace android {

	#define CPU_STAT_FILE "/proc/stat"
	#define SAMPLES_FILE "/samples"
	#define PID_STAT_FILE "/proc/%d/stat"
	#define PID_CMDLINE_FILE "/proc/%d/cmdline"
	#define PID_IO_FILE "/proc/%d/io"
	#define PROC_DIR "/proc"

	static const int MAX_LINE = 256;

	#define die(...) { LOG(ERROR) << (__VA_ARGS__); exit(EXIT_FAILURE); }

	void PopulateCpu(CpuData& cpu) {
	long unsigned utime, ntime, stime, itime;
	long unsigned iowtime, irqtime, sirqtime;
	FILE *file;
	file = fopen(CPU_STAT_FILE, "r");
	if (!file) die("Could not open /proc/stat.\n");
	fscanf(file, "cpu %lu %lu %lu %lu %lu %lu %lu", &utime, &ntime, &stime,
	&itime, &iowtime, &irqtime, &sirqtime);
	fclose(file);
	cpu.set_utime(utime);
	cpu.set_ntime(ntime);
	cpu.set_stime(stime);
	cpu.set_itime(itime);
	cpu.set_iowtime(iowtime);
	cpu.set_irqtime(irqtime);
	cpu.set_sirqtime(sirqtime);
	}

	void ClearPreviousResults(std::string path) {
	std::string err;
	if (!android::base::RemoveFileIfExists(path, &err)) {
	LOG(ERROR) << "failed to remove the file " << path << " " << err;
	return;
	}
	}

	int ReadIo(char filename, AppSample sample) {
	FILE *file;
	char line[MAX_LINE];
	unsigned int rchar = 0;
	unsigned int wchar = 0;
	unsigned int syscr = 0;
	unsigned int syscw = 0;
	unsigned int readbytes = 0;
	unsigned int writebytes = 0;

	file = fopen(filename, "r");
	if (!file) return 1;
	while (fgets(line, MAX_LINE, file)) {
	sscanf(line, "rchar: %u", &rchar);
	sscanf(line, "wchar: %u", &wchar);
	sscanf(line, "syscr: %u", &syscr);
	sscanf(line, "syscw: %u", &syscw);
	sscanf(line, "read_bytes: %u", &readbytes);
	sscanf(line, "write_bytes: %u", &writebytes);
	}
	fclose(file);
	sample->set_rchar(rchar);
	sample->set_wchar(wchar);
	sample->set_syscr(syscr);
	sample->set_syscw(syscw);
	sample->set_readbytes(readbytes);
	sample->set_writebytes(writebytes);
	return 0;
	}

	int ReadStatForName(char filename, AppData app) {
	FILE *file;
	char buf[MAX_LINE], open_paren, close_paren;

	file = fopen(filename, "r");
	if (!file) return 1;
	fgets(buf, MAX_LINE, file);
	fclose(file);

	/* Split at first '(' and last ')' to get process name. */
	open_paren = strchr(buf, '(');
	close_paren = strrchr(buf, ')');
	if (!open_paren \|\| !close_paren) return 1;

	open_paren = close_paren = '\0';
	if (!app->has_tname()) {
	app->set_tname(open_paren + 1, close_paren - open_paren - 1);
	}
	return 0;
	}

	int ReadStat(char filename, AppSample sample) {
	FILE *file;
	char buf[MAX_LINE], open_paren, close_paren;

	file = fopen(filename, "r");
	if (!file) return 1;
	fgets(buf, MAX_LINE, file);
	fclose(file);

	/* Split at first '(' and last ')' to get process name. */
	open_paren = strchr(buf, '(');
	close_paren = strrchr(buf, ')');
	if (!open_paren \|\| !close_paren) return 1;

	uint64_t utime;
	uint64_t stime;
	uint64_t rss;

	/* Scan rest of string. */
	sscanf(close_paren + 1,
	" %c " "%d %d %d %d %d %d %d %d %d %*d "
	"%" PRIu64 /SCNu64/
	"%" PRIu64 /SCNu64/ "%d %d %d %d %d %d %d %d "
	"%" PRIu64 /SCNu64/ "%d %d %d %d %d %d %d %d %d %d %d %d %d %d %*d",
	&utime,
	&stime,
	&rss);
	sample->set_utime(utime);
	sample->set_stime(stime);
	sample->set_rss(rss);

	return 0;
	}

	int ReadCmdline(char filename, AppData app) {
	FILE *file;
	char line[MAX_LINE];

	line[0] = '\0';
	file = fopen(filename, "r");
	if (!file) return 1;
	fgets(line, MAX_LINE, file);
	fclose(file);
	if (strlen(line) > 0) {
	app->set_name(line, strlen(line));
	} else {
	app->set_name("N/A");
	}
	return 0;
	};

	void ReadProcData(std::unordered_map<int, AppData*>& pidDataMap, DataContainer& dataContainer,
	time_t currentTimeUtc, time_t currentUptime) {
	DIR *procDir;
	struct dirent *pidDir;
	pid_t pid;
	char filename[64];
	procDir = opendir(PROC_DIR);
	if (!procDir) die("Could not open /proc.\n");
	while ((pidDir = readdir(procDir))) {
	if (!isdigit(pidDir->d_name[0])) {
	continue;
	}
	pid = atoi(pidDir->d_name);
	AppData *data;

	// TODO: in theory same pid can be shared for multiple processes,
	// might need add extra check.
	if (pidDataMap.count(pid) == 0) {
	data = dataContainer.add_app();
	data->set_pid(pid);
	sprintf(filename, PID_STAT_FILE, pid);
	ReadStatForName(filename, data);
	sprintf(filename, PID_CMDLINE_FILE, pid);
	ReadCmdline(filename, data);
	pidDataMap[pid] = data;
	} else {
	data = pidDataMap[pid];
	}
	AppSample *sample = data->add_samples();
	sample->set_timestamp(currentTimeUtc);
	sample->set_uptime(currentUptime);

	sprintf(filename, PID_STAT_FILE, pid);
	ReadStat(filename, sample);

	sprintf(filename, PID_IO_FILE, pid);
	ReadIo(filename, sample);
	}
	}

	uint64_t SumCpuValues(CpuData& cpu) {
	return cpu.utime() + cpu.ntime() + cpu.stime() + cpu.itime() + cpu.iowtime() +
	cpu.irqtime() + cpu.sirqtime();
	}

	time_t GetUptime() {
	std::string uptime_str;
	if (!android::base::ReadFileToString("/proc/uptime", &uptime_str)) {
	LOG(ERROR) << "Failed to read /proc/uptime";
	return -1;
	}

	// Cast intentionally rounds down.
	return static_cast<time_t>(strtod(uptime_str.c_str(), NULL));
	}

	struct Stats {
	int uptime;
	float cpu;
	uint64_t rbytes;
	uint64_t wbytes;
	};

	void PrintPids(DataContainer& data, std::unordered_map<int, uint64_t>& cpuDataMap) {
	printf("rchar: number of bytes the process read, using any read-like system call "
	"(from files, pipes, tty...).\n");
	printf("wchar: number of bytes the process wrote using any write-like system call.\n");
	printf("wchar: number of bytes the process wrote using any write-like system call.\n");
	printf("syscr: number of write-like system call invocations that the process performed.\n");
	printf("rbytes: number of bytes the process directly read from disk.\n");
	printf("wbytes: number of bytes the process originally dirtied in the page-cache "
	"(assuming they will go to disk later).\n\n");

	std::unique_ptr<AppSample> bootZeroSample(new AppSample());
	std::map<int, Stats> statsMap;
	// Init stats map
	Stats emptyStat {0, 0., 0, 0};
	for (auto it = cpuDataMap.begin(); it != cpuDataMap.end(); it++) {
	statsMap[it->first] = emptyStat;
	}
	for (int i = 0; i < data.app_size(); i++) {
	const AppData appData = data.app(i);
	printf("\n-----------------------------------------------------------------------------\n");
	printf("PID:\t%u\n", appData.pid());
	printf("Name:\t%s\n", appData.name().c_str());
	printf("ThName:\t%s\n", appData.tname().c_str());
	printf("%-15s%-13s%-13s%-13s%-13s%-13s%-13s%-13s\n", "Uptime inter.", "rchar", "wchar",
	"syscr", "syscw", "rbytes", "wbytes", "cpu%");
	const AppSample *olderSample = NULL;
	const AppSample *newerSample = NULL;
	bool isFirstSample = true;
	for (int j = 0; j < appData.samples_size(); j++) {
	olderSample = newerSample;
	newerSample = &(appData.samples(j));
	if (olderSample == NULL) {
	olderSample = bootZeroSample.get();
	}
	float cpuLoad = 0.;
	uint64_t cpuDelta;
	if (isFirstSample) {
	cpuDelta = cpuDataMap[newerSample->timestamp()];
	} else {
	cpuDelta = cpuDataMap[newerSample->timestamp()] -
	cpuDataMap[olderSample->timestamp()];
	}
	if (cpuDelta != 0) {
	cpuLoad = (newerSample->utime() - olderSample->utime() +
	newerSample->stime() - olderSample->stime()) * 100. / cpuDelta;
	}
	Stats& stats = statsMap[newerSample->timestamp()];
	stats.uptime = newerSample->uptime();
	stats.cpu += cpuLoad;
	stats.rbytes += (newerSample->readbytes() - olderSample->readbytes());
	stats.wbytes += (newerSample->writebytes() - olderSample->writebytes());

	#define NUMBER "%-13" PRId64
	printf("%5" PRId64 " - %-5" PRId64 " " NUMBER NUMBER NUMBER NUMBER NUMBER NUMBER "%-9.2f\n",
	#undef NUMBER
	olderSample->uptime(),
	newerSample->uptime(),
	newerSample->rchar() - olderSample->rchar(),
	newerSample->wchar() - olderSample->wchar(),
	newerSample->syscr() - olderSample->syscr(),
	newerSample->syscw() - olderSample->syscw(),
	newerSample->readbytes() - olderSample->readbytes(),
	newerSample->writebytes() - olderSample->writebytes(),
	cpuLoad);
	isFirstSample = false;
	}
	if (!newerSample) {
	LOG(ERROR) << "newerSample is null";
	} else {
	printf("-----------------------------------------------------------------------------"
	"\n");
	#define NUMBER "%-13" PRId64
	printf("%-15s" NUMBER NUMBER NUMBER NUMBER NUMBER NUMBER "\n",
	#undef NUMBER
	"Total", newerSample->rchar(), newerSample->wchar(), newerSample->syscr(),
	newerSample->syscw(), newerSample->readbytes(), newerSample->writebytes());
	}
	}
	printf("\nAggregations\n%-10s%-13s%-13s%-13s\n",
	"Total",
	"rbytes",
	"wbytes",
	"cpu%");

	for (auto it = statsMap.begin(); it != statsMap.end(); it++) {
	printf("%-10u%-13" PRIu64 "%-13" PRIu64 "%-9.2f\n",
	it->second.uptime,
	it->second.rbytes,
	it->second.wbytes,
	it->second.cpu);
	}
	}

	}

	BootioCollector::BootioCollector(std::string path) {
	DCHECK_EQ('/', path.back());
	path_ = path;
	}

	void BootioCollector::StartDataCollection(int timeout, int samples) {
	android::ClearPreviousResults(getStoragePath());
	int remaining = samples + 1;
	int delayS = timeout / samples;

	std::unordered_map < int, AppData * > pidDataMap;
	std::unique_ptr <DataContainer> data(new DataContainer());
	while (remaining > 0) {
	time_t currentTimeUtc = time(nullptr);
	time_t currentUptime = android::GetUptime();
	CpuData *cpu = data->add_cpu();
	cpu->set_timestamp(currentTimeUtc);
	cpu->set_uptime(currentUptime);
	android::PopulateCpu(*cpu);
	android::ReadProcData(pidDataMap, *data.get(), currentTimeUtc, currentUptime);
	remaining--;
	if (remaining == 0) {
	continue;
	}
	sleep(delayS);
	}
	std::string file_data;
	if (!data->SerializeToString(&file_data)) {
	LOG(ERROR) << "Failed to serialize";
	return;
	}
	if (!android::base::WriteStringToFile(file_data, getStoragePath())) {
	LOG(ERROR) << "Failed to write samples";
	}
	}

	void BootioCollector::Print() {
	std::string file_data;
	if (!android::base::ReadFileToString(getStoragePath(), &file_data)) {
	printf("Failed to read data from file.\n");
	return;
	}
	std::unique_ptr <DataContainer> data(new DataContainer());
	if (!data->ParsePartialFromString(file_data)) {
	printf("Failed to parse data.\n");
	return;
	}
	std::unordered_map<int, uint64_t> cpuDataMap;
	for (int i = 0; i < data->cpu_size(); i++) {
	CpuData cpu_data = data->cpu(i);
	cpuDataMap[cpu_data.timestamp()] = android::SumCpuValues(cpu_data);
	}
	android::PrintPids(*data.get(), cpuDataMap);
	}


	std::string BootioCollector::getStoragePath() {
	return path_ + SAMPLES_FILE;
	}