From 2010776f8ccb68b85efbade3f19a11b17fb33d74 Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Mon, 19 Jul 2021 10:08:12 -0700 Subject: [PATCH] tools/rcu: Add an extract-stall script 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 --- tools/rcu/extract-stall.sh | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 tools/rcu/extract-stall.sh diff --git a/tools/rcu/extract-stall.sh b/tools/rcu/extract-stall.sh new file mode 100644 index 000000000000..e565697c9f90 --- /dev/null +++ b/tools/rcu/extract-stall.sh @@ -0,0 +1,34 @@ +#!/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 +