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✏️ /lib/udev/kdump-udev-throttler

✕ Tutup

#!/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

Batal

⬅ lib 14 item

Nama	Tipe	Ukuran	Diubah	Perm	Aksi
📁 hwdb.d	dir	—	26/06/26 03:11	0755	📂
📁 rules.d	dir	—	26/06/26 03:11	0755	📂
📄 ata_id	file	19.3 KB	25/06/26 07:28	0755	✏️ ⬇
📄 cdrom_id	file	31.4 KB	25/06/26 07:28	0755	✏️ ⬇
📄 dmi_memory_id	file	27.4 KB	25/06/26 07:28	0755	✏️ ⬇
📄 fc_wwpn_id	file	1.1 KB	04/01/21 13:17	0755	✏️ ⬇
📄 fido_id	file	23.3 KB	25/06/26 07:28	0755	✏️ ⬇
📄 kdump-udev-throttler	file	1.6 KB	09/04/26 01:11	0755	✏️ ⬇
📄 kpartx_id	file	2.3 KB	05/04/26 07:24	0755	✏️ ⬇
📄 mtd_probe	file	15.2 KB	25/06/26 07:28	0755	✏️ ⬇
📄 prefixdevname	file	1.5 MB	25/03/22 22:11	0755	✏️ ⬇
📄 rename_device	file	15.2 KB	14/05/25 21:50	0755	✏️ ⬇
📄 scsi_id	file	36 KB	25/06/26 07:28	0755	✏️ ⬇
📄 v4l_id	file	15.2 KB	25/06/26 07:28	0755	✏️ ⬇

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