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tools/rcu: Add an extract-stall script

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This commit adds a script that extracts RCU CPU stall warnings
from console output.  The user can optionally specify the number of
lines preceding the stall to output, and also the number of lines of
stall-warning text.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2021-07-19 10:08:12 -07:00
parent b380b10b84
commit 2010776f8c
1 changed files with 34 additions and 0 deletions
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34
tools/rcu/extract-stall.sh Normal file
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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0+
#
# Extract any RCU CPU stall warnings present in specified file.
# Filter out clocksource lines. Note that preceding-lines excludes the
# initial line of the stall warning but trailing-lines includes it.
#
# Usage: extract-stall.sh dmesg-file [ preceding-lines [ trailing-lines ] ]
echo $1
preceding_lines="${2-3}"
trailing_lines="${3-10}"
awk -v preceding_lines="$preceding_lines" -v trailing_lines="$trailing_lines" '
suffix <= 0 {
for (i = preceding_lines; i > 0; i--)
last[i] = last[i - 1];
last[0] = $0;
}
suffix > 0 {
print $0;
suffix--;
if (suffix <= 0)
print "";
}
suffix <= 0 && /detected stall/ {
for (i = preceding_lines; i >= 0; i--)
if (last[i] != "")
print last[i];
suffix = trailing_lines;
}' < "$1" | tr -d '\015' | grep -v clocksource