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Current Path: /lib/udev

ðŸ“ ..
ðŸ“„ ata_id(40.73 KB)
ðŸ“„ cdrom_id(32.51 KB)
ðŸ“„ collect(20.57 KB)
ðŸ“„ fc_wwpn_id(1.1 KB)
ðŸ“„ fido_id(16.43 KB)
ðŸ“ hwdb.d
ðŸ“„ kdump-udev-throttler(1.41 KB)
ðŸ“„ kpartx_id(2.33 KB)
ðŸ“„ libinput-device-group(16.29 KB)
ðŸ“„ libinput-fuzz-extract(20.66 KB)
ðŸ“„ libinput-fuzz-to-zero(11.88 KB)
ðŸ“„ mtd_probe(12.41 KB)
ðŸ“„ prefixdevname(1.46 MB)
ðŸ“„ rename_device(16.46 KB)
ðŸ“ rules.d
ðŸ“„ scsi_id(53.7 KB)
ðŸ“„ v4l_id(11.99 KB)

Editing: 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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Editing: kdump-udev-throttler

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