| 2023-09-07 16:14:30 |
Eric DeVolder |
description |
The following series has landed in mainline, and will be present in 6.6.
"crash: Kernel handling of CPU and memory hot un/plug"
https://lore.kernel.org/lkml/20230814214446.6659-1-eric.devolder@oracle.com/
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d68b4b6f307d155475cce541f2aee938032ed22e
To take advantage of the performance benefits of that series, 98-kexec.rules
needs an update to optimize the handling of CPU and memory hotplug changes.
These lines need to be added to the top of 98-kexec.rules:
# The kernel updates the crash elfcorehdr for CPU and memory changes
SUBSYSTEM=="cpu", ATTRS{crash_hotplug}=="1", GOTO="kdump_reload_end"
SUBSYSTEM=="memory", ATTRS{crash_hotplug}=="1", GOTO="kdump_reload_end"
It is safe to deploy these rule updates now, ahead of distros/kernels
enabling the feature, since the crash_hotplug sysfs nodes would not be
present and thus the newly introduced rules in 98-kexec would act as a
nop-op and fall thru for legacy behavior. But when distros/kernels
enable the feature, then 98-kexec rules is ready and can properly take
advantage. |
The following series has landed in mainline, and will be present in 6.6.
"crash: Kernel handling of CPU and memory hot un/plug"
https://lore.kernel.org/lkml/20230814214446.6659-1-eric.devolder@oracle.com/
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d68b4b6f307d155475cce541f2aee938032ed22e
To take advantage of the performance benefits of that series, 50-kdump-tools.rules
needs an update to optimize the handling of CPU and memory hotplug changes.
It is safe to deploy these rule updates now, ahead of distros/kernels
enabling the feature, since the crash_hotplug sysfs nodes would not be
present and thus the newly introduced rules in 50-kdump-tools would act as a
nop-op and fall thru for legacy behavior. But when distros/kernels
enable the feature, then 50-kdump-tools rules is ready and can properly take
advantage. |
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