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insns_for_pid/
insns-for-pid.rs

1use libc::pid_t;
2use perf_event::events::Hardware;
3use perf_event::Builder;
4use std::thread::sleep;
5use std::time::Duration;
6
7fn main() -> std::io::Result<()> {
8    let pid: pid_t = std::env::args()
9        .nth(1)
10        .expect("Usage: insns-for-pid PID")
11        .parse()
12        .expect("Usage: insns-for-pid PID");
13
14    let mut insns = Builder::new()
15        .observe_pid(pid)
16        .kind(Hardware::BRANCH_INSTRUCTIONS)
17        .build()?;
18
19    // Count instructions in PID for five seconds.
20    insns.enable()?;
21    sleep(Duration::from_secs(5));
22    insns.disable()?;
23
24    println!("instructions in last five seconds: {}", insns.read()?);
25
26    Ok(())
27}