tools/rcu/extract-stall.sh

   1 #!/bin/sh
   2 # SPDX-License-Identifier: GPL-2.0+
   3
   4 usage() {
   5         echo Extract any RCU CPU stall warnings present in specified file.
   6         echo Filter out clocksource lines.  Note that preceding-lines excludes the
   7         echo initial line of the stall warning but trailing-lines includes it.
   8         echo
   9         echo Usage: $(basename $0) dmesg-file [ preceding-lines [ trailing-lines ] ]
  10         echo
  11         echo Error: $1
  12 }
  13
  14 # Terminate the script, if the argument is missing
  15
  16 if test -f "$1" && test -r "$1"
  17 then
  18         :
  19 else
  20         usage "Console log file \"$1\" missing or unreadable."
  21         exit 1
  22 fi
  23
  24 echo $1
  25 preceding_lines="${2-3}"
  26 trailing_lines="${3-10}"
  27
  28 awk -v preceding_lines="$preceding_lines" -v trailing_lines="$trailing_lines" '
  29 suffix <= 0 {
  30         for (i = preceding_lines; i > 0; i--)
  31                 last[i] = last[i - 1];
  32         last[0] = $0;
  33 }
  34
  35 suffix > 0 {
  36         print $0;
  37         suffix--;
  38         if (suffix <= 0)
  39                 print "";
  40 }
  41
  42 suffix <= 0 && /detected stall/ {
  43         for (i = preceding_lines; i >= 0; i--)
  44                 if (last[i] != "")
  45                         print last[i];
  46         suffix = trailing_lines;
  47 }' < "$1" | tr -d '\015' | grep -v clocksource
  48