testsuite/systemtap.examples/io/iotop.stp


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global reads, writes, total_io

probe kernel.function("vfs_read") {
    reads[execname()] += $count
}

probe kernel.function("vfs_write") {
    writes[execname()] += $count
}

# print top 10 IO processes every 5 seconds
probe timer.s(5) {
    foreach (name in writes)
        total_io[name] += writes[name]
    foreach (name in reads)
        total_io[name] += reads[name]
    printf ("%16s\t%10s\t%10s\n", "Process", "KB Read", "KB Written")
    foreach (name in total_io- limit 10)
        printf("%16s\t%10d\t%10d\n", name,
               reads[name]/1024, writes[name]/1024)
    delete reads
    delete writes
    delete total_io
    print("\n")
}