LXR linux/tools/rcu/extract-stall.sh

   1#!/bin/sh
   2# SPDX-License-Identifier: GPL-2.0+
   3#
   4# Extract any RCU CPU stall warnings present in specified file.
   5# Filter out clocksource lines.  Note that preceding-lines excludes the
   6# initial line of the stall warning but trailing-lines includes it.
   7#
   8# Usage: extract-stall.sh dmesg-file [ preceding-lines [ trailing-lines ] ]
   9
  10echo $1
  11preceding_lines="${2-3}"
  12trailing_lines="${3-10}"
  13
  14awk -v preceding_lines="$preceding_lines" -v trailing_lines="$trailing_lines" '
  15suffix <= 0 {
  16        for (i = preceding_lines; i > 0; i--)
  17                last[i] = last[i - 1];
  18        last[0] = $0;
  19}
  20
  21suffix > 0 {
  22        print $0;
  23        suffix--;
  24        if (suffix <= 0)
  25                print "";
  26}
  27
  28suffix <= 0 && /detected stall/ {
  29        for (i = preceding_lines; i >= 0; i--)
  30                if (last[i] != "")
  31                        print last[i];
  32        suffix = trailing_lines;
  33}' < "$1" | tr -d '\015' | grep -v clocksource
  34
  35