On 11/9/20 1:14 AM, Christoph Hellwig wrote:
On Fri, Nov 06, 2020 at 01:26:50PM -0800, Ralph Campbell wrote:
On 11/6/20 12:03 AM, Christoph Hellwig wrote:
I hate the extra pin count magic here. IMHO we really need to finish
off the series to get rid of the extra references on the ZONE_DEVICE
pages first.
First, thanks for the review comments.
I don't like the extra refcount either, that is why I tried to fix that up
before resending this series. However, you didn't like me just fixing the
refcount only for device private pages and I don't know the dax/pmem code
and peer-to-peer PCIe uses of ZONE_DEVICE pages well enough to say how
long it will take me to fix all the use cases.
So I wanted to make progress on the THP migration code in the mean time.
I think P2P is pretty trivial, given that ZONE_DEVICE pages are used like
a normal memory allocator. DAX is the interesting case, any specific
help that you need with that?
Thanks for the offer. I'm putting a list together... :-)
