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name	type	size	perms	modified	actions
[parent directory]
hwdb.d/	dir	-	0755	2026-08-18 11:43:16
rules.d/	dir	-	0755	2026-08-19 08:37:53
ata_id	file	20,072 B	0755	2026-06-03 00:00:00	edit
cdrom_id	file	32,512 B	0755	2026-06-03 00:00:00	edit
dmi_memory_id	file	24,240 B	0755	2026-06-03 00:00:00	edit
fc_wwpn_id	file	1,134 B	0755	2021-01-04 06:17:04	edit
fido_id	file	24,152 B	0755	2026-06-03 00:00:00	edit
iocost	file	28,520 B	0755	2026-06-03 00:00:00	edit
iocost.conf	file	865 B	0644	2024-12-10 19:23:45	edit
kdump-udev-throttler	file	1,664 B	0755	2026-02-02 00:00:00	edit
kpartx_id	file	2,395 B	0755	2026-02-19 00:00:00	edit
mtd_probe	file	15,936 B	0755	2026-06-03 00:00:00	edit
prefixdevname	file	2,086,872 B	0755	2024-10-29 00:00:00	edit
rename_device	file	15,848 B	0755	2024-10-29 00:00:00	edit
scsi_id	file	37,184 B	0755	2026-06-03 00:00:00	edit
udev.conf	file	305 B	0644	2024-12-10 19:23:45	edit
v4l_id	file	15,928 B	0755	2026-06-03 00:00:00	edit

editing: 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"

LUKS_CONFIGFS_REUSE=/sys/kernel/config/crash_dm_crypt_keys/reuse
reuse_luks_keys()
{
	[[ -f $LUKS_CONFIGFS_REUSE ]] || echo 1 > $LUKS_CONFIGFS_REUSE
}

unuse_luks_keys()
{

[[ -f $LUKS_CONFIGFS_REUSE ]] || echo 0 > $LUKS_CONFIGFS_REUSE
}

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

if ! flock -n 9; 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>&-

reuse_luks_keys
/bin/kdumpctl reload
unuse_luks_keys

exit 0

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