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Linux/tools/rcu/extract-stall.sh

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  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 

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