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236bdb881d
This commit converts extract-stall.sh script's header comment to a usage() function, and adds an argument check. While in the area, make this script be executable. [ paulmck: Strength argument check, remove extraneous comment. ] Signed-off-by: Bhaskar Chowdhury <unixbhaskar@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
48 lines
1 KiB
Bash
Executable file
48 lines
1 KiB
Bash
Executable file
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0+
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usage() {
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echo Extract any RCU CPU stall warnings present in specified file.
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echo Filter out clocksource lines. Note that preceding-lines excludes the
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echo initial line of the stall warning but trailing-lines includes it.
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echo
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echo Usage: $(basename $0) dmesg-file [ preceding-lines [ trailing-lines ] ]
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echo
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echo Error: $1
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}
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# Terminate the script, if the argument is missing
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if test -f "$1" && test -r "$1"
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then
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:
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else
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usage "Console log file \"$1\" missing or unreadable."
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exit 1
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fi
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echo $1
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preceding_lines="${2-3}"
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trailing_lines="${3-10}"
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awk -v preceding_lines="$preceding_lines" -v trailing_lines="$trailing_lines" '
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suffix <= 0 {
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for (i = preceding_lines; i > 0; i--)
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last[i] = last[i - 1];
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last[0] = $0;
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}
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suffix > 0 {
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print $0;
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suffix--;
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if (suffix <= 0)
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print "";
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}
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suffix <= 0 && /detected stall/ {
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for (i = preceding_lines; i >= 0; i--)
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if (last[i] != "")
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print last[i];
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suffix = trailing_lines;
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}' < "$1" | tr -d '\015' | grep -v clocksource
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