mirror of
https://github.com/scylladb/scylladb.git
synced 2026-04-23 01:50:35 +00:00
91 lines
2.2 KiB
C++
91 lines
2.2 KiB
C++
/*
|
|
* Copyright (C) 2021-present ScyllaDB
|
|
*/
|
|
|
|
/*
|
|
* This file is part of Scylla.
|
|
*
|
|
* Scylla is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU Affero General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* Scylla is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
|
|
#include "linux-perf-event.hh"
|
|
|
|
#include <linux/perf_event.h>
|
|
#include <linux/hw_breakpoint.h>
|
|
#include <sys/ioctl.h>
|
|
#include <asm/unistd.h>
|
|
|
|
linux_perf_event::linux_perf_event(const struct ::perf_event_attr& attr, pid_t pid, int cpu, int group_fd, unsigned long flags) {
|
|
int ret = syscall(__NR_perf_event_open, &attr, pid, cpu, group_fd, flags);
|
|
if (ret != -1) {
|
|
_fd = ret; // ignore failures, can happen in constrained environments such as containers
|
|
}
|
|
}
|
|
|
|
linux_perf_event::~linux_perf_event() {
|
|
if (_fd != -1) {
|
|
::close(_fd);
|
|
}
|
|
}
|
|
|
|
linux_perf_event&
|
|
linux_perf_event::operator=(linux_perf_event&& x) noexcept {
|
|
if (this != &x) {
|
|
if (_fd != -1) {
|
|
::close(_fd);
|
|
}
|
|
_fd = std::exchange(x._fd, -1);
|
|
}
|
|
return *this;
|
|
}
|
|
|
|
uint64_t
|
|
linux_perf_event::read() {
|
|
if (_fd == -1) {
|
|
return 0;
|
|
}
|
|
uint64_t ret;
|
|
::read(_fd, &ret, sizeof(ret));
|
|
return ret;
|
|
}
|
|
|
|
void
|
|
linux_perf_event::enable() {
|
|
if (_fd == -1) {
|
|
return;
|
|
}
|
|
::ioctl(_fd, PERF_EVENT_IOC_ENABLE, 0);
|
|
}
|
|
|
|
void
|
|
linux_perf_event::disable() {
|
|
if (_fd == -1) {
|
|
return;
|
|
}
|
|
::ioctl(_fd, PERF_EVENT_IOC_DISABLE, 0);
|
|
}
|
|
|
|
linux_perf_event
|
|
linux_perf_event::user_instructions_retired() {
|
|
return linux_perf_event(perf_event_attr{
|
|
.type = PERF_TYPE_HARDWARE,
|
|
.size = sizeof(struct perf_event_attr),
|
|
.config = PERF_COUNT_HW_INSTRUCTIONS,
|
|
.disabled = 1,
|
|
.exclude_kernel = 1,
|
|
.exclude_hv = 1,
|
|
}, 0, -1, -1, 0);
|
|
}
|