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Name	Size	Permission
hwdb.d	[ DIR ]	drwxr-xr-x
rules.d	[ DIR ]	drwxr-xr-x
ata_id	19.45 KB	-rwxr-xr-x
cdrom_id	31.59 KB	-rwxr-xr-x
dmi_memory_id	27.54 KB	-rwxr-xr-x
fc_wwpn_id	1.11 KB	-rwxr-xr-x
fido_id	23.44 KB	-rwxr-xr-x
kdump-udev-throttler	1.41 KB	-rwxr-xr-x
kpartx_id	2.33 KB	-rwxr-xr-x
mtd_probe	15.41 KB	-rwxr-xr-x
prefixdevname	1.45 MB	-rwxr-xr-x
rename_device	15.35 KB	-rwxr-xr-x
scsi_id	36.14 KB	-rwxr-xr-x
v4l_id	15.41 KB	-rwxr-xr-x

Code Editor : kdump-udev-throttler

#!/usr/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

${this.title}

Code Editor : kdump-udev-throttler