tools/gator/daemon/PerfDriver.cpp - kernel/linux-linaro-stable.git - Linaro Git Browser

 /**
  * Copyright (C) ARM Limited 2013-2015. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */

 #include "PerfDriver.h"

 #include <dirent.h>
 #include <sys/utsname.h>
 #include <time.h>
 #include <unistd.h>

 #include "Buffer.h"
 #include "Config.h"
 #include "ConfigurationXML.h"
 #include "Counter.h"
 #include "DriverSource.h"
 #include "DynBuf.h"
 #include "Logging.h"
 #include "PerfGroup.h"
 #include "SessionData.h"
 #include "Setup.h"

 #define PERF_DEVICES "/sys/bus/event_source/devices"

 #define TYPE_DERIVED ~0U

 // From gator.h
 struct gator_cpu {
 	const int cpuid;
 	// Human readable name
 	const char *const core_name;
 	// gatorfs event and Perf PMU name
 	const char *const pmnc_name;
 	const int pmnc_counters;
 };

 // From gator_main.c
 static const struct gator_cpu gator_cpus[] = {
 	{ 0x41b36, "ARM1136",      "ARM_ARM11",        3 },
 	{ 0x41b56, "ARM1156",      "ARM_ARM11",        3 },
 	{ 0x41b76, "ARM1176",      "ARM_ARM11",        3 },
 	{ 0x41b02, "ARM11MPCore",  "ARM_ARM11MPCore",  3 },
 	{ 0x41c05, "Cortex-A5",    "ARMv7_Cortex_A5",  2 },
 	{ 0x41c07, "Cortex-A7",    "ARMv7_Cortex_A7",  4 },
 	{ 0x41c08, "Cortex-A8",    "ARMv7_Cortex_A8",  4 },
 	{ 0x41c09, "Cortex-A9",    "ARMv7_Cortex_A9",  6 },
 	{ 0x41c0f, "Cortex-A15",   "ARMv7_Cortex_A15", 6 },
 	{ 0x41c0d, "Cortex-A17",   "ARMv7_Cortex_A17", 6 },
 	{ 0x41c0e, "Cortex-A17",   "ARMv7_Cortex_A17", 6 },
 	{ 0x5100f, "Scorpion",     "Scorpion",         4 },
 	{ 0x5102d, "ScorpionMP",   "ScorpionMP",       4 },
 	{ 0x51049, "KraitSIM",     "Krait",            4 },
 	{ 0x5104d, "Krait",        "Krait",            4 },
 	{ 0x5106f, "Krait S4 Pro", "Krait",            4 },
 	{ 0x41d03, "Cortex-A53",   "ARM_Cortex-A53",   6 },
 	{ 0x41d07, "Cortex-A57",   "ARM_Cortex-A57",   6 },
 	{ 0x41d08, "Cortex-A72",   "ARM_Cortex-A72",   6 },
 };

 static const char OLD_PMU_PREFIX[] = "ARMv7 Cortex-";
 static const char NEW_PMU_PREFIX[] = "ARMv7_Cortex_";

 struct uncore_counter {
 	// Perf PMU name
 	const char *const perfName;
 	// gatorfs event name
 	const char *const gatorName;
 	const int count;
 	const bool hasCyclesCounter;
 };

 static const struct uncore_counter uncore_counters[] = {
 	{ "CCI_400",    "CCI_400",     4, true },
 	{ "CCI_400-r1", "CCI_400-r1",  4, true },
 	{ "CCI_500",    "CCI_500",     8, false },
 	{ "ccn",        "ARM_CCN_5XX", 8, true },
 };

 class PerfCounter : public DriverCounter {
 public:
 	PerfCounter(DriverCounter *next, const char *name, uint32_t type, uint64_t config, uint64_t sampleType, uint64_t flags) : DriverCounter(next, name), mType(type), mConfig(config), mSampleType(sampleType), mFlags(flags), mCount(0) {}

 	~PerfCounter() {
 	}

 	uint32_t getType() const { return mType; }
 	int getCount() const { return mCount; }
 	void setCount(const int count) { mCount = count; }
 	uint64_t getConfig() const { return mConfig; }
 	void setConfig(const uint64_t config) { mConfig = config; }
 	uint64_t getSampleType() const { return mSampleType; }
 	uint64_t getFlags() const { return mFlags; }
 	virtual void read(Buffer *const, const int) {}

 private:
 	const uint32_t mType;
 	uint64_t mConfig;
 	const uint64_t mSampleType;
 	const uint64_t mFlags;
 	int mCount;

 	// Intentionally undefined
 	PerfCounter(const PerfCounter &);
 	PerfCounter &operator=(const PerfCounter &);
 };

 class CPUFreqDriver : public PerfCounter {
 public:
 	CPUFreqDriver(DriverCounter *next, uint64_t id) : PerfCounter(next, "Linux_power_cpu_freq", PERF_TYPE_TRACEPOINT, id, PERF_SAMPLE_RAW, PERF_GROUP_LEADER | PERF_GROUP_PER_CPU) {}

 	void read(Buffer *const buffer, const int cpu) {
 		char buf[64];

 		snprintf(buf, sizeof(buf), "/sys/devices/system/cpu/cpu%i/cpufreq/cpuinfo_cur_freq", cpu);
 		int64_t freq;
 		if (DriverSource::readInt64Driver(buf, &freq) != 0) {
 			freq = 0;
 		}
 		buffer->perfCounter(cpu, getKey(), 1000*freq);
 	}

 private:
 	// Intentionally undefined
 	CPUFreqDriver(const CPUFreqDriver &);
 	CPUFreqDriver &operator=(const CPUFreqDriver &);
 };

 PerfDriver::PerfDriver() : mIsSetup(false), mLegacySupport(false) {
 }

 PerfDriver::~PerfDriver() {
 }

 void PerfDriver::addCpuCounters(const char *const counterName, const int type, const int numCounters) {
 	int len = snprintf(NULL, 0, "%s_ccnt", counterName) + 1;
 	char *name = new char[len];
 	snprintf(name, len, "%s_ccnt", counterName);
 	setCounters(new PerfCounter(getCounters(), name, type, -1, PERF_SAMPLE_READ, PERF_GROUP_PER_CPU | PERF_GROUP_CPU));

 	for (int j = 0; j < numCounters; ++j) {
 		len = snprintf(NULL, 0, "%s_cnt%d", counterName, j) + 1;
 		name = new char[len];
 		snprintf(name, len, "%s_cnt%d", counterName, j);
 		setCounters(new PerfCounter(getCounters(), name, type, -1, PERF_SAMPLE_READ, PERF_GROUP_PER_CPU | PERF_GROUP_CPU));
 	}
 }

 void PerfDriver::addUncoreCounters(const char *const counterName, const int type, const int numCounters, const bool hasCyclesCounter) {
 	int len;
 	char *name;

 	if (hasCyclesCounter) {
 		len = snprintf(NULL, 0, "%s_ccnt", counterName) + 1;
 		name = new char[len];
 		snprintf(name, len, "%s_ccnt", counterName);
 		setCounters(new PerfCounter(getCounters(), name, type, -1, PERF_SAMPLE_READ, 0));
 	}

 	for (int j = 0; j < numCounters; ++j) {
 		len = snprintf(NULL, 0, "%s_cnt%d", counterName, j) + 1;
 		name = new char[len];
 		snprintf(name, len, "%s_cnt%d", counterName, j);
 		setCounters(new PerfCounter(getCounters(), name, type, -1, PERF_SAMPLE_READ, 0));
 	}
 }

 bool PerfDriver::setup() {
 	// Check the kernel version
 	int release[3];
 	if (!getLinuxVersion(release)) {
 		logg->logMessage("getLinuxVersion failed");
 		return false;
 	}

 	if (KERNEL_VERSION(release[0], release[1], release[2]) < KERNEL_VERSION(3, 4, 0)) {
 		logg->logMessage("Unsupported kernel version");
 		return false;
 	}
 	mLegacySupport = KERNEL_VERSION(release[0], release[1], release[2]) < KERNEL_VERSION(3, 12, 0);

 	if (access(EVENTS_PATH, R_OK) != 0) {
 		logg->logMessage(EVENTS_PATH " does not exist, is CONFIG_TRACING and CONFIG_CONTEXT_SWITCH_TRACER enabled?");
 		return false;
 	}

 	// Add supported PMUs
 	bool foundCpu = false;
 	DIR *dir = opendir(PERF_DEVICES);
 	if (dir == NULL) {
 		logg->logMessage("opendir failed");
 		return false;
 	}

 	struct dirent *dirent;
 	while ((dirent = readdir(dir)) != NULL) {
 		for (int i = 0; i < ARRAY_LENGTH(gator_cpus); ++i) {
 			const struct gator_cpu *const gator_cpu = &gator_cpus[i];

 			// Do the names match exactly?
 			if (strcasecmp(gator_cpu->pmnc_name, dirent->d_name) != 0 &&
 			    // Do these names match but have the old vs new prefix?
 			    ((strncasecmp(dirent->d_name, OLD_PMU_PREFIX, sizeof(OLD_PMU_PREFIX) - 1) != 0 ||
 			      strncasecmp(gator_cpu->pmnc_name, NEW_PMU_PREFIX, sizeof(NEW_PMU_PREFIX) - 1) != 0 ||
 			      strcasecmp(dirent->d_name + sizeof(OLD_PMU_PREFIX) - 1, gator_cpu->pmnc_name + sizeof(NEW_PMU_PREFIX) - 1) != 0))) {
 				continue;
 			}

 			int type;
 			char buf[256];
 			snprintf(buf, sizeof(buf), PERF_DEVICES "/%s/type", dirent->d_name);
 			if (DriverSource::readIntDriver(buf, &type) != 0) {
 				continue;
 			}

 			foundCpu = true;
 			logg->logMessage("Adding cpu counters for %s", gator_cpu->pmnc_name);
 			addCpuCounters(gator_cpu->pmnc_name, type, gator_cpu->pmnc_counters);
 		}

 		for (int i = 0; i < ARRAY_LENGTH(uncore_counters); ++i) {
 			if (strcmp(dirent->d_name, uncore_counters[i].perfName) != 0) {
 				continue;
 			}

 			int type;
 			char buf[256];
 			snprintf(buf, sizeof(buf), PERF_DEVICES "/%s/type", dirent->d_name);
 			if (DriverSource::readIntDriver(buf, &type) != 0) {
 				continue;
 			}

 			logg->logMessage("Adding uncore counters for %s", uncore_counters[i].gatorName);
 			addUncoreCounters(uncore_counters[i].gatorName, type, uncore_counters[i].count, uncore_counters[i].hasCyclesCounter);
 		}
 	}
 	closedir(dir);

 	if (!foundCpu) {
 		// If no cpu was found based on pmu names, try by cpuid
 		for (int i = 0; i < ARRAY_LENGTH(gator_cpus); ++i) {
 			if (gSessionData->mMaxCpuId != gator_cpus[i].cpuid) {
 				continue;
 			}

 			foundCpu = true;
 			logg->logMessage("Adding cpu counters (based on cpuid) for %s", gator_cpus[i].pmnc_name);
 			addCpuCounters(gator_cpus[i].pmnc_name, PERF_TYPE_RAW, gator_cpus[i].pmnc_counters);
 		}
 	}

 	if (!foundCpu) {
 		// If all else fails, use the ARM architected counters
 		logg->logMessage("Using Other cpu");
 		addCpuCounters("Other", PERF_TYPE_RAW, 6);
 	}

 	// Add supported software counters
 	long long id;
 	DynBuf printb;

 	id = getTracepointId("irq/softirq_exit", &printb);
 	if (id >= 0) {
 		setCounters(new PerfCounter(getCounters(), "Linux_irq_softirq", PERF_TYPE_TRACEPOINT, id, PERF_SAMPLE_READ, PERF_GROUP_PER_CPU | PERF_GROUP_CPU));
 	}

 	id = getTracepointId("irq/irq_handler_exit", &printb);
 	if (id >= 0) {
 		setCounters(new PerfCounter(getCounters(), "Linux_irq_irq", PERF_TYPE_TRACEPOINT, id, PERF_SAMPLE_READ, PERF_GROUP_PER_CPU | PERF_GROUP_CPU));
 	}

 	id = getTracepointId(SCHED_SWITCH, &printb);
 	if (id >= 0) {
 		setCounters(new PerfCounter(getCounters(), "Linux_sched_switch", PERF_TYPE_TRACEPOINT, id, PERF_SAMPLE_READ, PERF_GROUP_PER_CPU | PERF_GROUP_CPU));
 	}

 	id = getTracepointId(CPU_FREQUENCY, &printb);
 	if (id >= 0) {
 		setCounters(new CPUFreqDriver(getCounters(), id));
 	}

 	setCounters(new PerfCounter(getCounters(), "Linux_cpu_wait_contention", TYPE_DERIVED, -1, 0, 0));

 	//Linux_cpu_wait_io

 	mIsSetup = true;
 	return true;
 }

 bool PerfDriver::summary(Buffer *const buffer) {
 	struct utsname utsname;
 	if (uname(&utsname) != 0) {
 		logg->logMessage("uname failed");
 		return false;
 	}

 	char buf[512];
 	snprintf(buf, sizeof(buf), "%s %s %s %s %s GNU/Linux", utsname.sysname, utsname.nodename, utsname.release, utsname.version, utsname.machine);

 	struct timespec ts;
 	if (clock_gettime(CLOCK_REALTIME, &ts) != 0) {
 		logg->logMessage("clock_gettime failed");
 		return false;
 	}
 	const int64_t timestamp = (int64_t)ts.tv_sec * NS_PER_S + ts.tv_nsec;

 	const uint64_t monotonicStarted = getTime();
 	gSessionData->mMonotonicStarted = monotonicStarted;
 	const uint64_t currTime = 0;//getTime() - gSessionData->mMonotonicStarted;

 	buffer->summary(currTime, timestamp, monotonicStarted, monotonicStarted, buf);

 	for (int i = 0; i < gSessionData->mCores; ++i) {
 		coreName(currTime, buffer, i);
 	}
 	buffer->commit(currTime);

 	return true;
 }

 void PerfDriver::coreName(const uint64_t currTime, Buffer *const buffer, const int cpu) {
 	// Don't send information on a cpu we know nothing about
 	if (gSessionData->mCpuIds[cpu] == -1) {
 		return;
 	}

 	int j;
 	for (j = 0; j < ARRAY_LENGTH(gator_cpus); ++j) {
 		if (gator_cpus[j].cpuid == gSessionData->mCpuIds[cpu]) {
 			break;
 		}
 	}
 	if (j < ARRAY_LENGTH(gator_cpus) && gator_cpus[j].cpuid == gSessionData->mCpuIds[cpu]) {
 		buffer->coreName(currTime, cpu, gSessionData->mCpuIds[cpu], gator_cpus[j].core_name);
 	} else {
 		char buf[32];
 		if (gSessionData->mCpuIds[cpu] == -1) {
 			snprintf(buf, sizeof(buf), "Unknown");
 		} else {
 			snprintf(buf, sizeof(buf), "Unknown (0x%.3x)", gSessionData->mCpuIds[cpu]);
 		}
 		buffer->coreName(currTime, cpu, gSessionData->mCpuIds[cpu], buf);
 	}
 }

 void PerfDriver::setupCounter(Counter &counter) {
 	PerfCounter *const perfCounter = static_cast<PerfCounter *>(findCounter(counter));
 	if (perfCounter == NULL) {
 		counter.setEnabled(false);
 		return;
 	}

 	// Don't use the config from counters XML if it's not set, ex: software counters
 	if (counter.getEvent() != -1) {
 		perfCounter->setConfig(counter.getEvent());
 	}
 	perfCounter->setCount(counter.getCount());
 	perfCounter->setEnabled(true);
 	counter.setKey(perfCounter->getKey());
 }

 bool PerfDriver::enable(const uint64_t currTime, PerfGroup *const group, Buffer *const buffer) const {
 	for (PerfCounter *counter = static_cast<PerfCounter *>(getCounters()); counter != NULL; counter = static_cast<PerfCounter *>(counter->getNext())) {
 		if (counter->isEnabled() && (counter->getType() != TYPE_DERIVED)) {
 			int count = counter->getCount();
 			uint64_t sampleType = counter->getSampleType();
 			if (sampleType & PERF_SAMPLE_RAW) {
 				// If raw is enabled, every sample is needed
 				count = 1;
 			}
 			if (!group->add(currTime, buffer, counter->getKey(), counter->getType(), counter->getConfig(), count,
 					// use getCount instead of count as EBS counters need TID and IP but RAW tracepoints don't
 					(counter->getCount() > 0 ? PERF_SAMPLE_TID | PERF_SAMPLE_IP : 0) | sampleType,
 					counter->getFlags())) {
 				logg->logMessage("PerfGroup::add failed");
 				return false;
 			}
 		}
 	}

 	return true;
 }

 void PerfDriver::read(Buffer *const buffer, const int cpu) {
 	for (PerfCounter *counter = static_cast<PerfCounter *>(getCounters()); counter != NULL; counter = static_cast<PerfCounter *>(counter->getNext())) {
 		if (!counter->isEnabled()) {
 			continue;
 		}
 		counter->read(buffer, cpu);
 	}
 }

 long long PerfDriver::getTracepointId(const char *const name, DynBuf *const printb) {
 	if (!printb->printf(EVENTS_PATH "/%s/id", name)) {
 		logg->logMessage("DynBuf::printf failed");
 		return -1;
 	}

 	int64_t result;
 	if (DriverSource::readInt64Driver(printb->getBuf(), &result) != 0) {
 		logg->logMessage("DriverSource::readInt64Driver failed");
 		return -1;
 	}

 	return result;
 }
	/**
	* Copyright (C) ARM Limited 2013-2015. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/

	#include "PerfDriver.h"

	#include <dirent.h>
	#include <sys/utsname.h>
	#include <time.h>
	#include <unistd.h>

	#include "Buffer.h"
	#include "Config.h"
	#include "ConfigurationXML.h"
	#include "Counter.h"
	#include "DriverSource.h"
	#include "DynBuf.h"
	#include "Logging.h"
	#include "PerfGroup.h"
	#include "SessionData.h"
	#include "Setup.h"

	#define PERF_DEVICES "/sys/bus/event_source/devices"

	#define TYPE_DERIVED ~0U

	// From gator.h
	struct gator_cpu {
	const int cpuid;
	// Human readable name
	const char *const core_name;
	// gatorfs event and Perf PMU name
	const char *const pmnc_name;
	const int pmnc_counters;
	};

	// From gator_main.c
	static const struct gator_cpu gator_cpus[] = {
	{ 0x41b36, "ARM1136", "ARM_ARM11", 3 },
	{ 0x41b56, "ARM1156", "ARM_ARM11", 3 },
	{ 0x41b76, "ARM1176", "ARM_ARM11", 3 },
	{ 0x41b02, "ARM11MPCore", "ARM_ARM11MPCore", 3 },
	{ 0x41c05, "Cortex-A5", "ARMv7_Cortex_A5", 2 },
	{ 0x41c07, "Cortex-A7", "ARMv7_Cortex_A7", 4 },
	{ 0x41c08, "Cortex-A8", "ARMv7_Cortex_A8", 4 },
	{ 0x41c09, "Cortex-A9", "ARMv7_Cortex_A9", 6 },
	{ 0x41c0f, "Cortex-A15", "ARMv7_Cortex_A15", 6 },
	{ 0x41c0d, "Cortex-A17", "ARMv7_Cortex_A17", 6 },
	{ 0x41c0e, "Cortex-A17", "ARMv7_Cortex_A17", 6 },
	{ 0x5100f, "Scorpion", "Scorpion", 4 },
	{ 0x5102d, "ScorpionMP", "ScorpionMP", 4 },
	{ 0x51049, "KraitSIM", "Krait", 4 },
	{ 0x5104d, "Krait", "Krait", 4 },
	{ 0x5106f, "Krait S4 Pro", "Krait", 4 },
	{ 0x41d03, "Cortex-A53", "ARM_Cortex-A53", 6 },
	{ 0x41d07, "Cortex-A57", "ARM_Cortex-A57", 6 },
	{ 0x41d08, "Cortex-A72", "ARM_Cortex-A72", 6 },
	};

	static const char OLD_PMU_PREFIX[] = "ARMv7 Cortex-";
	static const char NEW_PMU_PREFIX[] = "ARMv7_Cortex_";

	struct uncore_counter {
	// Perf PMU name
	const char *const perfName;
	// gatorfs event name
	const char *const gatorName;
	const int count;
	const bool hasCyclesCounter;
	};

	static const struct uncore_counter uncore_counters[] = {
	{ "CCI_400", "CCI_400", 4, true },
	{ "CCI_400-r1", "CCI_400-r1", 4, true },
	{ "CCI_500", "CCI_500", 8, false },
	{ "ccn", "ARM_CCN_5XX", 8, true },
	};

	class PerfCounter : public DriverCounter {
	public:
	PerfCounter(DriverCounter next, const char name, uint32_t type, uint64_t config, uint64_t sampleType, uint64_t flags) : DriverCounter(next, name), mType(type), mConfig(config), mSampleType(sampleType), mFlags(flags), mCount(0) {}

	~PerfCounter() {
	}

	uint32_t getType() const { return mType; }
	int getCount() const { return mCount; }
	void setCount(const int count) { mCount = count; }
	uint64_t getConfig() const { return mConfig; }
	void setConfig(const uint64_t config) { mConfig = config; }
	uint64_t getSampleType() const { return mSampleType; }
	uint64_t getFlags() const { return mFlags; }
	virtual void read(Buffer *const, const int) {}

	private:
	const uint32_t mType;
	uint64_t mConfig;
	const uint64_t mSampleType;
	const uint64_t mFlags;
	int mCount;

	// Intentionally undefined
	PerfCounter(const PerfCounter &);
	PerfCounter &operator=(const PerfCounter &);
	};

	class CPUFreqDriver : public PerfCounter {
	public:
	CPUFreqDriver(DriverCounter *next, uint64_t id) : PerfCounter(next, "Linux_power_cpu_freq", PERF_TYPE_TRACEPOINT, id, PERF_SAMPLE_RAW, PERF_GROUP_LEADER \| PERF_GROUP_PER_CPU) {}

	void read(Buffer *const buffer, const int cpu) {
	char buf[64];

	snprintf(buf, sizeof(buf), "/sys/devices/system/cpu/cpu%i/cpufreq/cpuinfo_cur_freq", cpu);
	int64_t freq;
	if (DriverSource::readInt64Driver(buf, &freq) != 0) {
	freq = 0;
	}
	buffer->perfCounter(cpu, getKey(), 1000*freq);
	}

	private:
	// Intentionally undefined
	CPUFreqDriver(const CPUFreqDriver &);
	CPUFreqDriver &operator=(const CPUFreqDriver &);
	};

	PerfDriver::PerfDriver() : mIsSetup(false), mLegacySupport(false) {
	}

	PerfDriver::~PerfDriver() {
	}

	void PerfDriver::addCpuCounters(const char *const counterName, const int type, const int numCounters) {
	int len = snprintf(NULL, 0, "%s_ccnt", counterName) + 1;
	char *name = new char[len];
	snprintf(name, len, "%s_ccnt", counterName);
	setCounters(new PerfCounter(getCounters(), name, type, -1, PERF_SAMPLE_READ, PERF_GROUP_PER_CPU \| PERF_GROUP_CPU));

	for (int j = 0; j < numCounters; ++j) {
	len = snprintf(NULL, 0, "%s_cnt%d", counterName, j) + 1;
	name = new char[len];
	snprintf(name, len, "%s_cnt%d", counterName, j);
	setCounters(new PerfCounter(getCounters(), name, type, -1, PERF_SAMPLE_READ, PERF_GROUP_PER_CPU \| PERF_GROUP_CPU));
	}
	}

	void PerfDriver::addUncoreCounters(const char *const counterName, const int type, const int numCounters, const bool hasCyclesCounter) {
	int len;
	char *name;

	if (hasCyclesCounter) {
	len = snprintf(NULL, 0, "%s_ccnt", counterName) + 1;
	name = new char[len];
	snprintf(name, len, "%s_ccnt", counterName);
	setCounters(new PerfCounter(getCounters(), name, type, -1, PERF_SAMPLE_READ, 0));
	}

	for (int j = 0; j < numCounters; ++j) {
	len = snprintf(NULL, 0, "%s_cnt%d", counterName, j) + 1;
	name = new char[len];
	snprintf(name, len, "%s_cnt%d", counterName, j);
	setCounters(new PerfCounter(getCounters(), name, type, -1, PERF_SAMPLE_READ, 0));
	}
	}

	bool PerfDriver::setup() {
	// Check the kernel version
	int release[3];
	if (!getLinuxVersion(release)) {
	logg->logMessage("getLinuxVersion failed");
	return false;
	}

	if (KERNEL_VERSION(release[0], release[1], release[2]) < KERNEL_VERSION(3, 4, 0)) {
	logg->logMessage("Unsupported kernel version");
	return false;
	}
	mLegacySupport = KERNEL_VERSION(release[0], release[1], release[2]) < KERNEL_VERSION(3, 12, 0);

	if (access(EVENTS_PATH, R_OK) != 0) {
	logg->logMessage(EVENTS_PATH " does not exist, is CONFIG_TRACING and CONFIG_CONTEXT_SWITCH_TRACER enabled?");
	return false;
	}

	// Add supported PMUs
	bool foundCpu = false;
	DIR *dir = opendir(PERF_DEVICES);
	if (dir == NULL) {
	logg->logMessage("opendir failed");
	return false;
	}

	struct dirent *dirent;
	while ((dirent = readdir(dir)) != NULL) {
	for (int i = 0; i < ARRAY_LENGTH(gator_cpus); ++i) {
	const struct gator_cpu *const gator_cpu = &gator_cpus[i];

	// Do the names match exactly?
	if (strcasecmp(gator_cpu->pmnc_name, dirent->d_name) != 0 &&
	// Do these names match but have the old vs new prefix?
	((strncasecmp(dirent->d_name, OLD_PMU_PREFIX, sizeof(OLD_PMU_PREFIX) - 1) != 0 \|\|
	strncasecmp(gator_cpu->pmnc_name, NEW_PMU_PREFIX, sizeof(NEW_PMU_PREFIX) - 1) != 0 \|\|
	strcasecmp(dirent->d_name + sizeof(OLD_PMU_PREFIX) - 1, gator_cpu->pmnc_name + sizeof(NEW_PMU_PREFIX) - 1) != 0))) {
	continue;
	}

	int type;
	char buf[256];
	snprintf(buf, sizeof(buf), PERF_DEVICES "/%s/type", dirent->d_name);
	if (DriverSource::readIntDriver(buf, &type) != 0) {
	continue;
	}

	foundCpu = true;
	logg->logMessage("Adding cpu counters for %s", gator_cpu->pmnc_name);
	addCpuCounters(gator_cpu->pmnc_name, type, gator_cpu->pmnc_counters);
	}

	for (int i = 0; i < ARRAY_LENGTH(uncore_counters); ++i) {
	if (strcmp(dirent->d_name, uncore_counters[i].perfName) != 0) {
	continue;
	}

	int type;
	char buf[256];
	snprintf(buf, sizeof(buf), PERF_DEVICES "/%s/type", dirent->d_name);
	if (DriverSource::readIntDriver(buf, &type) != 0) {
	continue;
	}

	logg->logMessage("Adding uncore counters for %s", uncore_counters[i].gatorName);
	addUncoreCounters(uncore_counters[i].gatorName, type, uncore_counters[i].count, uncore_counters[i].hasCyclesCounter);
	}
	}
	closedir(dir);

	if (!foundCpu) {
	// If no cpu was found based on pmu names, try by cpuid
	for (int i = 0; i < ARRAY_LENGTH(gator_cpus); ++i) {
	if (gSessionData->mMaxCpuId != gator_cpus[i].cpuid) {
	continue;
	}

	foundCpu = true;
	logg->logMessage("Adding cpu counters (based on cpuid) for %s", gator_cpus[i].pmnc_name);
	addCpuCounters(gator_cpus[i].pmnc_name, PERF_TYPE_RAW, gator_cpus[i].pmnc_counters);
	}
	}

	if (!foundCpu) {
	// If all else fails, use the ARM architected counters
	logg->logMessage("Using Other cpu");
	addCpuCounters("Other", PERF_TYPE_RAW, 6);
	}

	// Add supported software counters
	long long id;
	DynBuf printb;

	id = getTracepointId("irq/softirq_exit", &printb);
	if (id >= 0) {
	setCounters(new PerfCounter(getCounters(), "Linux_irq_softirq", PERF_TYPE_TRACEPOINT, id, PERF_SAMPLE_READ, PERF_GROUP_PER_CPU \| PERF_GROUP_CPU));
	}

	id = getTracepointId("irq/irq_handler_exit", &printb);
	if (id >= 0) {
	setCounters(new PerfCounter(getCounters(), "Linux_irq_irq", PERF_TYPE_TRACEPOINT, id, PERF_SAMPLE_READ, PERF_GROUP_PER_CPU \| PERF_GROUP_CPU));
	}

	id = getTracepointId(SCHED_SWITCH, &printb);
	if (id >= 0) {
	setCounters(new PerfCounter(getCounters(), "Linux_sched_switch", PERF_TYPE_TRACEPOINT, id, PERF_SAMPLE_READ, PERF_GROUP_PER_CPU \| PERF_GROUP_CPU));
	}

	id = getTracepointId(CPU_FREQUENCY, &printb);
	if (id >= 0) {
	setCounters(new CPUFreqDriver(getCounters(), id));
	}

	setCounters(new PerfCounter(getCounters(), "Linux_cpu_wait_contention", TYPE_DERIVED, -1, 0, 0));

	//Linux_cpu_wait_io

	mIsSetup = true;
	return true;
	}

	bool PerfDriver::summary(Buffer *const buffer) {
	struct utsname utsname;
	if (uname(&utsname) != 0) {
	logg->logMessage("uname failed");
	return false;
	}

	char buf[512];
	snprintf(buf, sizeof(buf), "%s %s %s %s %s GNU/Linux", utsname.sysname, utsname.nodename, utsname.release, utsname.version, utsname.machine);

	struct timespec ts;
	if (clock_gettime(CLOCK_REALTIME, &ts) != 0) {
	logg->logMessage("clock_gettime failed");
	return false;
	}
	const int64_t timestamp = (int64_t)ts.tv_sec * NS_PER_S + ts.tv_nsec;

	const uint64_t monotonicStarted = getTime();
	gSessionData->mMonotonicStarted = monotonicStarted;
	const uint64_t currTime = 0;//getTime() - gSessionData->mMonotonicStarted;

	buffer->summary(currTime, timestamp, monotonicStarted, monotonicStarted, buf);

	for (int i = 0; i < gSessionData->mCores; ++i) {
	coreName(currTime, buffer, i);
	}
	buffer->commit(currTime);

	return true;
	}

	void PerfDriver::coreName(const uint64_t currTime, Buffer *const buffer, const int cpu) {
	// Don't send information on a cpu we know nothing about
	if (gSessionData->mCpuIds[cpu] == -1) {
	return;
	}

	int j;
	for (j = 0; j < ARRAY_LENGTH(gator_cpus); ++j) {
	if (gator_cpus[j].cpuid == gSessionData->mCpuIds[cpu]) {
	break;
	}
	}
	if (j < ARRAY_LENGTH(gator_cpus) && gator_cpus[j].cpuid == gSessionData->mCpuIds[cpu]) {
	buffer->coreName(currTime, cpu, gSessionData->mCpuIds[cpu], gator_cpus[j].core_name);
	} else {
	char buf[32];
	if (gSessionData->mCpuIds[cpu] == -1) {
	snprintf(buf, sizeof(buf), "Unknown");
	} else {
	snprintf(buf, sizeof(buf), "Unknown (0x%.3x)", gSessionData->mCpuIds[cpu]);
	}
	buffer->coreName(currTime, cpu, gSessionData->mCpuIds[cpu], buf);
	}
	}

	void PerfDriver::setupCounter(Counter &counter) {
	PerfCounter const perfCounter = static_cast<PerfCounter >(findCounter(counter));
	if (perfCounter == NULL) {
	counter.setEnabled(false);
	return;
	}

	// Don't use the config from counters XML if it's not set, ex: software counters
	if (counter.getEvent() != -1) {
	perfCounter->setConfig(counter.getEvent());
	}
	perfCounter->setCount(counter.getCount());
	perfCounter->setEnabled(true);
	counter.setKey(perfCounter->getKey());
	}

	bool PerfDriver::enable(const uint64_t currTime, PerfGroup const group, Buffer const buffer) const {
	for (PerfCounter counter = static_cast<PerfCounter >(getCounters()); counter != NULL; counter = static_cast<PerfCounter *>(counter->getNext())) {
	if (counter->isEnabled() && (counter->getType() != TYPE_DERIVED)) {
	int count = counter->getCount();
	uint64_t sampleType = counter->getSampleType();
	if (sampleType & PERF_SAMPLE_RAW) {
	// If raw is enabled, every sample is needed
	count = 1;
	}
	if (!group->add(currTime, buffer, counter->getKey(), counter->getType(), counter->getConfig(), count,
	// use getCount instead of count as EBS counters need TID and IP but RAW tracepoints don't
	(counter->getCount() > 0 ? PERF_SAMPLE_TID \| PERF_SAMPLE_IP : 0) \| sampleType,
	counter->getFlags())) {
	logg->logMessage("PerfGroup::add failed");
	return false;
	}
	}
	}

	return true;
	}

	void PerfDriver::read(Buffer *const buffer, const int cpu) {
	for (PerfCounter counter = static_cast<PerfCounter >(getCounters()); counter != NULL; counter = static_cast<PerfCounter *>(counter->getNext())) {
	if (!counter->isEnabled()) {
	continue;
	}
	counter->read(buffer, cpu);
	}
	}

	long long PerfDriver::getTracepointId(const char const name, DynBuf const printb) {
	if (!printb->printf(EVENTS_PATH "/%s/id", name)) {
	logg->logMessage("DynBuf::printf failed");
	return -1;
	}

	int64_t result;
	if (DriverSource::readInt64Driver(printb->getBuf(), &result) != 0) {
	logg->logMessage("DriverSource::readInt64Driver failed");
	return -1;
	}

	return result;
	}