Messages in this thread | | | Date | Fri, 11 Mar 2016 14:33:57 -0800 | From | "Luck, Tony" <> | Subject | Re: [PATCH] x86/irq: Cure live lock in irq_force_complete_move() |
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With this patch applied my system survives me doing several rounds of:
# echo 0 | tee /sys/devices/system/cpu/cpu*/online # echo 1 | tee /sys/devices/system/cpu/cpu*/online
whereas without the patch the first of those went to
[152455.129604] NMI watchdog: Watchdog detected hard LOCKUP on cpu 96 [152455.136943] Kernel panic - not syncing: Hard LOCKUP
I'm not sure we care to optimize the cpu offline path, but I'll note here that taking all (but one) cpus offline took 52 seconds (for a hundred and mumble logical cpus). Bringing them all back is just 4 seconds.
Tested-by: Tony Luck <tony.luck@intel.com>
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