Vendor perf event

1 files changed, 27 insertions, 0 deletions

diff --git a/perf-event/examples/insns-for-pid.rs b/perf-event/examples/insns-for-pid.rs
new file mode 100644
index 0000000..3fc73ae
--- /dev/null
+++ b/perf-event/examples/insns-for-pid.rs
@@ -0,0 +1,27 @@
+use libc::pid_t;
+use perf_event::events::Hardware;
+use perf_event::Builder;
+use std::thread::sleep;
+use std::time::Duration;
+
+fn main() -> std::io::Result<()> {
+    let pid: pid_t = std::env::args()
+        .nth(1)
+        .expect("Usage: insns-for-pid PID")
+        .parse()
+        .expect("Usage: insns-for-pid PID");
+
+    let mut insns = Builder::new()
+        .observe_pid(pid)
+        .kind(Hardware::BRANCH_INSTRUCTIONS)
+        .build()?;
+
+    // Count instructions in PID for five seconds.
+    insns.enable()?;
+    sleep(Duration::from_secs(5));
+    insns.disable()?;
+
+    println!("instructions in last five seconds: {}", insns.read()?);
+
+    Ok(())
+}