1#@!#!123s

: / proc / self / root / sbin /
Filename : swapin.bt
back
#!/usr/bin/env bpftrace
// swapin - Show swapins by process.
//
// See BPF Performance Tools, Chapter 7, for an explanation of this tool.
//
// Example of usage:
//
// # ./swapin.bt
// Attaching 2 probes...
// 13:36:59
//
// 13:37:00
// @[chrome, 4536]: 10809
// @[gnome-shell, 2239]: 12410
//
// 13:37:01
// @[chrome, 4536]: 3826
//
// 13:37:02
// @[cron, 1180]: 23
// @[gnome-shell, 2239]: 2462
//
// 13:37:03
// @[gnome-shell, 1444]: 4
// @[gnome-shell, 2239]: 3420
//
// 13:37:04
//
// 13:37:05
// [...]
//
// While tracing, this showed that PID 2239 (gnome-shell) and PID 4536 (chrome)
// suffered over ten thousand swapins.
//
// Copyright (c) 2019 Brendan Gregg.
// This was originally created for the BPF Performance Tools book
// published by Addison Wesley. ISBN-13: 9780136554820
// When copying or porting, include this comment.
//
// 26-Jan-2019  Brendan Gregg   Created this.
// 31-May-2024  Rong Tao        Add folio support.

config = {
  missing_probes = ignore;
}

// kernel commit c9bdf768dd93("mm: convert swap_readpage() to swap_read_folio()")
// convert swap_readpage() to swap_read_folio(), try attaching two kprobes,
// only one will succeed and the other will be silently ignored.
kprobe:swap_readpage,
kprobe:swap_read_folio
{
  @[comm,pid] = count();
}

interval:1s
{
  time();
  print(@);
  clear(@);
}