linux-kernel - Re: [PATCH bpf-next v2 2/3] xdp: xdp_umem: replace kmap on vmap for umem map

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Date:   Thu, 15 Aug 2019 12:33:44 -0700
From:   "Jonathan Lemon" <jlemon@...gsvamp.com>
To:     "Ivan Khoronzhuk" <ivan.khoronzhuk@...aro.org>
Cc:     magnus.karlsson@...el.com, bjorn.topel@...el.com,
        davem@...emloft.net, hawk@...nel.org, john.fastabend@...il.com,
        jakub.kicinski@...ronome.com, daniel@...earbox.net,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        xdp-newbies@...r.kernel.org, linux-kernel@...r.kernel.org,
        yhs@...com, andrii.nakryiko@...il.com
Subject: Re: [PATCH bpf-next v2 2/3] xdp: xdp_umem: replace kmap on vmap for
 umem map



On 15 Aug 2019, at 5:13, Ivan Khoronzhuk wrote:

> For 64-bit there is no reason to use vmap/vunmap, so use page_address
> as it was initially. For 32 bits, in some apps, like in samples
> xdpsock_user.c when number of pgs in use is quite big, the kmap
> memory can be not enough, despite on this, kmap looks like is
> deprecated in such cases as it can block and should be used rather
> for dynamic mm.
>
> Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>

Acked-by: Jonathan Lemon <jonathan.lemon@...il.com>