On Tue, Jul 28, 2020 at 06:28:25PM +0200, Greg KH wrote: > On Mon, Jul 27, 2020 at 03:44:34PM -0700, Jonathan Lemon wrote: > > From: Jonathan Lemon <b...@fb.com> > > > > netgpu pages will always have a refcount of at least one (held by > > the netgpu module). If the skb is marked as containing netgpu ZC > > pages, recycle them back to netgpu. > > What???
Yes, this is page refcount elevation. ZONE_DEVICE pages do this also, which is hidden in put_devmap_managed_page(). I would really like to find a generic solution for this, as it has come up in other cases as well (page recycling for page_pool, for example). Some way to say "this page is different", and a separate routine to release refcounts. Can we have a discussion on this possibility? -- Jonathan
