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Example usage:
```zig
const std = @import("std");
const PERF = std.os.linux.PERF;
const assert = std.debug.assert;
test "perf" {
var attr: std.os.linux.perf_event_attr = .{
.type = PERF.TYPE.HARDWARE,
.config = @enumToInt(PERF.COUNT.HW.INSTRUCTIONS),
.flags = .{
.disabled = true,
.exclude_kernel = true,
.exclude_hv = true,
},
};
const fd = try std.os.perf_event_open(&attr, 0, -1, -1, PERF.FLAG.FD_CLOEXEC);
defer std.os.close(fd);
_ = std.os.linux.ioctl(fd, PERF.EVENT_IOC.RESET, 0);
_ = std.os.linux.ioctl(fd, PERF.EVENT_IOC.ENABLE, 0);
long();
_ = std.os.linux.ioctl(fd, PERF.EVENT_IOC.DISABLE, 0);
var result: usize = 0;
assert((try std.os.read(fd, std.mem.asBytes(&result))) == @sizeOf(usize));
std.debug.print("instruction count: {d}\n", .{result});
}
fn long() void {
var i: usize = 0;
while (i < 100000) : (i += 1) {}
}
```