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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

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.	dir	-	root/root	0755	2024-09-26 06:31:52
..	dir	-	root/root	0555	2024-11-13 07:31:48
hwdb.d	dir	-	root/root	0755	2024-09-26 06:31:52
rules.d	dir	-	root/root	0755	2024-11-07 07:44:01
ata_id	application/x-pie-executable	40.73 KB	root/root	0755	2024-09-24 02:25:21
cdrom_id	application/x-pie-executable	32.51 KB	root/root	0755	2024-09-24 02:25:21
collect	application/x-pie-executable	20.57 KB	root/root	0755	2024-09-24 02:25:21
fc_wwpn_id	text/x-shellscript	1.1 KB	root/root	0755	2022-10-08 11:49:23
fido_id	application/x-pie-executable	16.43 KB	root/root	0755	2024-09-24 02:25:21
kdump-udev-throttler	text/x-shellscript	1.41 KB	root/root	0755	2024-09-24 08:36:00
kpartx_id	text/x-shellscript	2.33 KB	root/root	0755	2024-04-06 01:01:35
libinput-device-group	application/x-pie-executable	16.29 KB	root/root	0755	2022-06-29 09:12:12
libinput-fuzz-extract	application/x-pie-executable	20.66 KB	root/root	0755	2022-06-29 09:12:12
libinput-fuzz-to-zero	application/x-pie-executable	11.88 KB	root/root	0755	2022-06-29 09:12:12
mtd_probe	application/x-pie-executable	12.41 KB	root/root	0755	2024-09-24 02:25:21
prefixdevname	application/x-pie-executable	1.46 MB	root/root	0755	2019-12-16 07:52:38
rename_device	application/x-pie-executable	16.46 KB	root/root	0755	2022-11-10 08:01:00
scsi_id	application/x-pie-executable	53.69 KB	root/root	0755	2024-09-24 02:25:21
v4l_id	application/x-pie-executable	12 KB	root/root	0755	2024-09-24 02:25:21