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dri-devel@lists.freedesktop.org; Doug Led= ford ; Leon Romanovsky > ; Sumit Semwal ; Christian Koen= ig ; Vetter, Daniel > > Subject: Re: [PATCH v5 1/5] RDMA/umem: Support importing dma-buf as user = memory region >=20 > On Thu, Oct 15, 2020 at 03:02:45PM -0700, Jianxin Xiong wrote: >=20 > > +static void ib_umem_dmabuf_invalidate_cb(struct dma_buf_attachment > > +*attach) { > > + struct ib_umem_dmabuf *umem_dmabuf =3D attach->importer_priv; > > + > > + dma_resv_assert_held(umem_dmabuf->attach->dmabuf->resv); > > + > > + ib_umem_dmabuf_unmap_pages(&umem_dmabuf->umem, true); > > + queue_work(ib_wq, &umem_dmabuf->work); >=20 > Do we really want to queue remapping or should it wait until there is a p= age fault? Queuing remapping here has performance advantage because it reduces the cha= nce of getting the page fault. >=20 > What do GPUs do? >=20 > Jason