swapin.bt

#!/usr/bin/env bpftrace
/*
 * swapin - Show swapins by process.
 *
 * See BPF Performance Tools, Chapter 7, for an explanation of this tool.
 *
 * Copyright (c) 2019 Brendan Gregg.
 * Licensed under the Apache License, Version 2.0 (the "License").
 * 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.
 */

/**
 * kernel commit c9bdf768dd93("mm: convert swap_readpage() to swap_read_folio()")
 * convert swap_readpage() to swap_read_folio(), try attaching two kprobes, one
 * will trigger a warning and the other will be attached successfully.
 */
kprobe:swap_readpage,
kprobe:swap_read_folio
{
        @[comm, pid] = count();
}

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