Public bug reported: 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.devol...@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. ** Affects: kexec-tools (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to kexec-tools in Ubuntu. https://bugs.launchpad.net/bugs/2034732 Title: The 98-kexec.rules file needs update for latest kernel 6.6 feature Status in kexec-tools package in Ubuntu: New Bug 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.devol...@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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/kexec-tools/+bug/2034732/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
