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hwdb.d	-	Open
rules.d	-	Open
ata_id	19.27 MB	View DL Edit
cdrom_id	31.42 MB	View DL Edit
dmi_memory_id	27.36 MB	View DL Edit
fido_id	23.27 MB	View DL Edit
kdump-udev-throttler	1.41 MB	View DL Edit
kpartx_id	2.33 MB	View DL Edit
mtd_probe	15.23 MB	View DL Edit
prefixdevname	1.45 GB	View DL Edit
rename_device	15.17 MB	View DL Edit
scsi_id	35.95 MB	View DL Edit
v4l_id	15.23 MB	View DL Edit

Edit file: /usr/lib/udev/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

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