On Wed, Jan 11, 2017 at 03:19:37PM -0800, Andi Kleen wrote: > > Switching from a single radix-tree to an array of radix-trees to reduce > > contention seems a bit hacky. That we can do this and have everything > > continue to work tells me that we're simply using an inappropriate data > > structure to hold this info. > > What would you use instead?
I agree that this approach is a bit hacky. However, it is pretty effective and simple. If later on we come up with a better solution to scale modfication of the radix tree, we can collapse the radix trees. I think developing a scalable radix tree with write modifications will take quite a while and is a non-trivial effort. With almost memory speed SSDs coming on the market soon, I think having a workable solution now and optimizing it for long term is reasonabale. Tim
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