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Improve 'cpu add' udev rules 

Currently kdump service is restarted even when any new file is added in cpu
subsystem. So, it can be restarted multiple times in the cases like loading
of acpi_cpufreq module or online/offline of any cpu.

However, we should see kdump service restart only once in case a new CPU
is added or removed. cpu crash notes buffer is created when a new CPU is
added. It's location does not change when a CPU is onlined/offlined or
acpi_cpufreq driver is loaded. Therefore, no need to restart kdump
service in such cases.

Thus, we need to introduce an extra filter for the kernel name of the
directory created by cpu_add which is KERNEL=="cpu[0-9]*". This will ensure
that kdump service is not restarted when any new file is added in /removed
from cpu subsystem.

Signed-off-by: Pratyush Anand <panand@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>
This commit is contained in:
Pratyush Anand 2017-07-28 09:39:26 +05:30 committed by Dave Young
parent 38e6b41c0c
commit 65d37d19c7
1 changed files with 2 additions and 2 deletions
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4
98-kexec.rules
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@ -1,4 +1,4 @@
SUBSYSTEM=="cpu", ACTION=="add", PROGRAM="/bin/systemctl try-restart kdump.service"
SUBSYSTEM=="cpu", ACTION=="remove", PROGRAM="/bin/systemctl try-restart kdump.service"
SUBSYSTEM=="cpu", ACTION=="add", KERNEL=="cpu[0-9]*", PROGRAM="/bin/systemctl try-restart kdump.service"
SUBSYSTEM=="cpu", ACTION=="remove", KERNEL=="cpu[0-9]*", PROGRAM="/bin/systemctl try-restart kdump.service"
SUBSYSTEM=="memory", ACTION=="online", PROGRAM="/bin/systemctl try-restart kdump.service"
SUBSYSTEM=="memory", ACTION=="offline", PROGRAM="/bin/systemctl try-restart kdump.service"