MSRSensorGroup.cpp 4.36 KB
Newer Older
1
2
3
4
/*
 * MSRSensorGroup.cpp
 *
 *  Created on: 28.01.2019
5
 *      Author: Carla Guillen
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
 */

#include "MSRSensorGroup.h"

#include <boost/log/core/record.hpp>
#include <boost/log/sources/record_ostream.hpp>
#include <boost/log/trivial.hpp>
#include <boost/log/utility/formatting_ostream.hpp>
#include <boost/parameter/keyword.hpp>
#include <fcntl.h>
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <atomic>
#include <exception>
#include <utility>

#include "../../includes/Logging.h"
#include "../../includes/SensorBase.h"
#include "timestamp.h"
#include "Types.h"
#include <sstream>
#include <iomanip>


MSRSensorGroup::MSRSensorGroup(const std::string& name) :
	SensorGroupTemplate(name) {
}

MSRSensorGroup::~MSRSensorGroup() {
}

void MSRSensorGroup::start() {
	if (_keepRunning) {
		//we have been started already
		LOG(info) << "Sensorgroup " << _groupName << " already running.";
		return;
	}

	for (auto &kv : cpuToFd) {
		int cpu = kv.first;
		char * path = new char[200];
		snprintf(path, 200, "/dev/cpu/%d/msr", cpu);
		int handle = open(path, O_RDWR);
		if (handle < 0) {   // try msr_safe
			snprintf(path, 200, "/dev/cpu/%d/msr_safe", cpu);
			handle = open(path, O_RDWR);
		}
		if (handle < 0){
			LOG(error) << "Can't open msr device " << path;
			delete [] path; // TODO do this with RAII
			continue;
		}
		delete [] path; //TODO do this with RAII
		cpuToFd[cpu] = handle;
	}

	program_fixed();

	_keepRunning = 1;
	_pendingTasks++;
	_timer->async_wait(std::bind(&MSRSensorGroup::readAsync, this));
	LOG(info) << "Sensorgroup " << _groupName << " started.";
}

void MSRSensorGroup::stop() {
	_keepRunning = 0;
	
	for (auto &kv: cpuToFd) {
		close(kv.second);
		kv.second = -1;
	}
	 
	LOG(info) << "Sensorgroup " << _groupName << " stopped.";
}

void MSRSensorGroup::read() {
	ureading_t reading;
	reading.timestamp = getTimestamp();

	try {
		for(auto s : _sensors) {
			msr_read(s->getMetric(), &reading.value, s->getCpu());
			s->storeReading(reading);
#ifdef DEBUG
			LOG(debug) << _groupName << "::" << s->getName() << " raw reading: \"" << reading.value << "\"";
#endif
		}
	} catch (const std::exception& e) {
		LOG(error) << "Sensorgroup" << _groupName << " could not read value: " << e.what();
	}
}

void MSRSensorGroup::readAsync() {
	uint64_t now = getTimestamp();
	read();
	if (_timer && _keepRunning) {
		_timer->expires_at(timestamp2ptime(nextReadingTime()));
		_pendingTasks++;
		_timer->async_wait(std::bind(&MSRSensorGroup::readAsync, this));
	}
	_pendingTasks--;
}

int32_t MSRSensorGroup::msr_read(uint64_t msr_number, uint64_t * value, unsigned int cpu){
	return pread(cpuToFd[cpu], (void *) value, sizeof(uint64_t), msr_number);
}

int32_t MSRSensorGroup::msr_write(uint64_t msr_number, uint64_t value, unsigned int cpu){
	return pwrite(cpuToFd[cpu], (const void *) &value, sizeof(uint64_t), msr_number);
}

void MSRSensorGroup::program_fixed(){
	for (auto &kv : cpuToFd) {
		// program core counters

		struct FixedEventControlRegister ctrl_reg;
		// disable counters while programming
		msr_write(IA32_CR_PERF_GLOBAL_CTRL, 0, kv.first);
		msr_read(IA32_CR_FIXED_CTR_CTRL, &ctrl_reg.value, kv.first);

		ctrl_reg.fields.os0 = 1;
		ctrl_reg.fields.usr0 = 1;
		ctrl_reg.fields.any_thread0 = 0;
		ctrl_reg.fields.enable_pmi0 = 0;

		ctrl_reg.fields.os1 = 1;
		ctrl_reg.fields.usr1 = 1;
		ctrl_reg.fields.any_thread1 = 0;
		ctrl_reg.fields.enable_pmi1 = 0;

		ctrl_reg.fields.os2 = 1;
		ctrl_reg.fields.usr2 = 1;
		ctrl_reg.fields.any_thread2 = 0;
		ctrl_reg.fields.enable_pmi2 = 0;

		ctrl_reg.fields.reserved1 = 0;
143

144
145
146
147
148
149
150
151
152
153
154
155
156
		msr_write(IA32_CR_FIXED_CTR_CTRL, ctrl_reg.value, kv.first);

		// start counting, enable 3 fixed counters
		//uint64 value = (1ULL << 0) + (1ULL << 1) + (1ULL << 2) + (1ULL << 3) + (1ULL << 32) + (1ULL << 33) + (1ULL << 34);
		uint64_t value = (1ULL << 32) + (1ULL << 33) + (1ULL << 34);
		msr_write(IA32_CR_PERF_GLOBAL_CTRL, value, kv.first);
	}

}

void MSRSensorGroup::addCpu(unsigned int cpu){
	cpuToFd[cpu] = -1; /* -1 because no file descriptor has been assigned yet. */
}
157

158
159
160
161
162
163
164
165
std::vector<unsigned> MSRSensorGroup::getCpus() {
  std::vector<unsigned> cpus;
  for(auto kv : cpuToFd) {
    cpus.push_back(kv.first);
  }
  return cpus;
}

166
167
168
169
170
171
172
173
174
175
void MSRSensorGroup::printConfig(LOG_LEVEL ll) {
    std::stringstream ss;
    const char* separator = "";
    for (auto &kv : cpuToFd) {
      ss << separator << kv.first;
      separator = ", ";
    }

    LOG_VAR(ll) << "   CPUs:  " << ss.str();
}