Messages in this thread | | | From | Chris Mason <> | Subject | Re: [PATCH] Enable remote RCU callback processing on SMP systems | Date | Wed, 22 Feb 2006 18:56:05 -0500 |
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On Wednesday 22 February 2006 17:00, Dimitri Sivanich wrote: > On Wed, Feb 22, 2006 at 03:23:22PM -0500, Chris Mason wrote: > > Aside from the possible race we talked about in __rcu_process_callbacks, > > I don't have huge objections here. But if the underlying problem is the > > cost of kmem_cache_free, would it be better to limit that instead of > > trying to push the latency around to specific cpus? > > The current problem is the cost of kmem_cache_free. What this > patch will do (versus limiting the cost of kmem_cache_free, if > that's at all possible) is to protect the cpus configured as > such against other costly sections of code that may be lurking > or that might be added in the future.
Right, but I'm suggesting that we might want to fix kmem_cache_free as well. I think your patch has value even with kmem_cache_free fixed. Given that the high cost parts of kmem_cache_free seem to be numa specific, fixing it seems like a good idea in general.
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