Messages in this thread | | | Date | Wed, 12 Jul 2017 09:49:11 -0500 (CDT) | From | Christopher Lameter <> | Subject | Re: [RFC][PATCH] slub: Introduce 'alternate' per cpu partial lists |
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On Wed, 14 Jun 2017, Joonsoo Kim wrote:
> > - Some of this code is redundant and can probably be combined. > > - The fast path is very sensitive and it was suggested I leave it alone. The > > approach I took means the fastpath cmpxchg always fails before trying the > > alternate cmpxchg. From some of my profiling, the cmpxchg seemed to be fairly > > expensive. > > It looks better to modify the fastpath for non-debuging poisoning. If > we use the jump label, it doesn't cause any overhead to the fastpath > for the user who doesn't use this feature. It really makes thing > simpler. Only a few more lines will be needed in the fastpath. > > Christoph, any opinion?
Just looked through it. Sorry was on vacation in Europe for awhile.
The duplication in kmem_cache_cpu is not good performance wise. Maybe just keep the single per cpu partial list and depending on a kmem_cache flag change the locking semantics in order to allow for faster debugging?
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