[PATCH v14 4/6] locking/qspinlock: Introduce starvation avoidance into CNA
Andi Kleen
ak at linux.intel.com
Tue Apr 13 07:03:12 BST 2021
Alex Kogan <alex.kogan at oracle.com> writes:
>
> + numa_spinlock_threshold= [NUMA, PV_OPS]
> + Set the time threshold in milliseconds for the
> + number of intra-node lock hand-offs before the
> + NUMA-aware spinlock is forced to be passed to
> + a thread on another NUMA node. Valid values
> + are in the [1..100] range. Smaller values result
> + in a more fair, but less performant spinlock,
> + and vice versa. The default value is 10.
ms granularity seems very coarse grained for this. Surely
at some point of spinning you can afford a ktime_get? But ok.
Could you turn that into a moduleparm which can be changed at runtime?
Would be strange to have to reboot just to play with this parameter
This would also make the code a lot shorter I guess.
-Andi
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