On 2019/3/12 上午11:50, Michael S. Tsirkin wrote:
Using direct mapping (I
guess kernel will always try hugepage for that?) should be better and we can
even use it for the data transfer not only for the metadata.
Thanks
We can't really. The big issue is get user pages. Doing that on data
path will be slower than copyXuser.
I meant if we can find a way to avoid doing gup in datapath. E.g vhost
maintain a range tree and add or remove ranges through MMU notifier. Then in
datapath, if we find the range, then use direct mapping otherwise
copy_to_user().
Thanks
We can try. But I'm not sure there's any reason to think there's any
locality there.
Ok, but what kind of locality do you mean here?
Thanks
