fcb8d040e8
Instead of lengthy blurbs, switch to single-line, machine-readable standardized (https://spdx.dev) license identifiers. The Linux kernel switched long ago, so there is strong precedent. Three cases are handled: AGPL-only, Apache-only, and dual licensed. For the latter case, I chose (AGPL-3.0-or-later and Apache-2.0), reasoning that our changes are extensive enough to apply our license. The changes we applied mechanically with a script, except to licenses/README.md. Closes #9937
78 lines
1.6 KiB
C++
78 lines
1.6 KiB
C++
/*
|
|
* Copyright (C) 2021-present ScyllaDB
|
|
*/
|
|
|
|
/*
|
|
* SPDX-License-Identifier: AGPL-3.0-or-later
|
|
*/
|
|
|
|
|
|
#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);
|
|
}
|