linux-kernel - Re: [for-next PATCH 2/5] RDMA/rxe: use iova_to_vaddr to transform iova for rxe_mr

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Date:   Fri, 18 Nov 2022 12:41:26 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Li Zhijian <lizhijian@...itsu.com>
Cc:     Zhu Yanjun <zyjzyj2000@...il.com>,
        Leon Romanovsky <leon@...nel.org>, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [for-next PATCH 2/5] RDMA/rxe: use iova_to_vaddr to transform
 iova for rxe_mr_copy

On Fri, Nov 11, 2022 at 04:30:27AM +0000, Li Zhijian wrote:
> Make the code more friendly and readable by using iova_to_vaddr()

But the point of this is to be faster because it knows pages are in a
linear list

As with my previous suggestion, just convert this to an xarray and
then it is a trivial and fast xas_for_each_range() returning struct
pages.

Jason