69d61bb3e3
In kernel, with the support of cpu/memory hotplug on crash, kdump reloading only needs to update the elfcorehdr. To realize the benefits, we need prevent udev from updating kdump kernel on hot un/plug changes when detecting that the crash_hotplug sysfs nodes are present. Link: https://lore.kernel.org/lkml/20230814214446.6659-1-eric.devolder@oracle.com/ Link: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d68b4b6f307d155475cce541f2aee938032ed22e Signed-off-by: Baoquan He <bhe@redhat.com>
27 lines
1.1 KiB
Plaintext
27 lines
1.1 KiB
Plaintext
# The kernel updates the crash elfcorehdr for CPU and memory changes
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SUBSYSTEM=="cpu", ATTRS{crash_hotplug}=="1", GOTO="kdump_reload_end"
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SUBSYSTEM=="memory", ATTRS{crash_hotplug}=="1", GOTO="kdump_reload_end"
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SUBSYSTEM=="cpu", ACTION=="online", GOTO="kdump_reload_cpu"
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SUBSYSTEM=="memory", ACTION=="online", GOTO="kdump_reload_mem"
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SUBSYSTEM=="memory", ACTION=="offline", GOTO="kdump_reload_mem"
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GOTO="kdump_reload_end"
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# If kdump is not loaded, calling kdump-udev-throttle will end up
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# doing nothing, but systemd-run will always generate extra logs for
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# each call, so trigger the kdump-udev-throttler only if kdump
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# service is active to avoid unnecessary logs
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LABEL="kdump_reload_mem"
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RUN+="/bin/sh -c '/usr/bin/systemctl is-active kdump.service || exit 0; /usr/bin/systemd-run --quiet --no-block /usr/lib/udev/kdump-udev-throttler'"
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GOTO="kdump_reload_end"
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LABEL="kdump_reload_cpu"
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RUN+="/bin/sh -c '/usr/bin/systemctl is-active kdump.service || exit 0; ! test -f /sys/kernel/fadump/enabled || cat /sys/kernel/fadump/enabled | grep 0 || exit 0; /usr/bin/systemd-run --quiet --no-block /usr/lib/udev/kdump-udev-throttler'"
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LABEL="kdump_reload_end"
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