Re: [PATCH] Enable remote RCU callback processing on SMP systems

[Chris Mason]

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.

-chris
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