IP : 18.116.87.70 Hostname : host45.registrar-servers.com Kernel : Linux host45.registrar-servers.com 4.18.0-513.18.1.lve.2.el8.x86_64 #1 SMP Sat Mar 30 15:36:11 UTC 2024 x86_64 Disable Function : None :) OS : Linux PATH: / home/ ./ ../ lib/ dracut/ ../ ./ kdump/ ../ ./ environment.d/ ../ udev/ kdump-udev-throttler/ /

#!/bin/bash
# This util helps to reduce the workload of kdump service restarting
# on udev event. When hotplugging memory / CPU, multiple udev
# events may be triggered concurrently, and obviously, we don't want
# to restart kdump service for each event.

# This script will be called by udev, and make sure kdump service is
# restart after all events we are watching are settled.

# On each call, this script will update try to aquire the $throttle_lock
# The first instance acquired the file lock will keep waiting for events
# to settle and then reload kdump. Other instances will just exit
# In this way, we can make sure kdump service is restarted immediately
# and for exactly once after udev events are settled.

throttle_lock="/var/lock/kdump-udev-throttle"

exec 9>$throttle_lock
if [ $? -ne 0 ]; then
echo "Failed to create the lock file! Fallback to non-throttled kdump service restart"
/bin/kdumpctl reload
exit 1
fi

flock -n 9
if [ $? -ne 0 ]; then
echo "Throttling kdump restart for concurrent udev event"
exit 0
fi

# Wait for at least 1 second, at most 4 seconds for udev to settle
# Idealy we will have a less than 1 second lag between udev events settle
# and kdump reload
sleep 1 && udevadm settle --timeout 3

# Release the lock, /bin/kdumpctl will block and make the process
# holding two locks at the same time and we might miss some events
exec 9>&-

/bin/kdumpctl reload

exit 0