tools/rcu/extract-stall.sh

0001 #!/bin/sh
0002 # SPDX-License-Identifier: GPL-2.0+
0003 #
0004 # Extract any RCU CPU stall warnings present in specified file.
0005 # Filter out clocksource lines.  Note that preceding-lines excludes the
0006 # initial line of the stall warning but trailing-lines includes it.
0007 #
0008 # Usage: extract-stall.sh dmesg-file [ preceding-lines [ trailing-lines ] ]
0009
0010 echo $1
0011 preceding_lines="${2-3}"
0012 trailing_lines="${3-10}"
0013
0014 awk -v preceding_lines="$preceding_lines" -v trailing_lines="$trailing_lines" '
0015 suffix <= 0 {
0016         for (i = preceding_lines; i > 0; i--)
0017                 last[i] = last[i - 1];
0018         last[0] = $0;
0019 }
0020
0021 suffix > 0 {
0022         print $0;
0023         suffix--;
0024         if (suffix <= 0)
0025                 print "";
0026 }
0027
0028 suffix <= 0 && /detected stall/ {
0029         for (i = preceding_lines; i >= 0; i--)
0030                 if (last[i] != "")
0031                         print last[i];
0032         suffix = trailing_lines;
0033 }' < "$1" | tr -d '\015' | grep -v clocksource
0034