netdev - Re: [PATCH bpf-next] xsk: support allocations of large umems

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Date:   Wed, 15 Jan 2020 11:43:45 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Jonathan Lemon <jonathan.lemon@...il.com>
Cc:     Magnus Karlsson <magnus.karlsson@...el.com>,
        Björn Töpel <bjorn.topel@...el.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Network Development <netdev@...r.kernel.org>, rgoodfel@....edu,
        bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH bpf-next] xsk: support allocations of large umems

On Wed, Jan 15, 2020 at 11:10 AM Jonathan Lemon
<jonathan.lemon@...il.com> wrote:
>
>
>
> On 14 Jan 2020, at 1:49, Magnus Karlsson wrote:
>
> > When registering a umem area that is sufficiently large (>1G on an
> > x86), kmalloc cannot be used to allocate one of the internal data
> > structures, as the size requested gets too large. Use kvmalloc instead
> > that falls back on vmalloc if the allocation is too large for kmalloc.
> >
> > Also add accounting for this structure as it is triggered by a user
> > space action (the XDP_UMEM_REG setsockopt) and it is by far the
> > largest structure of kernel allocated memory in xsk.
> >
> > Signed-off-by: Magnus Karlsson <magnus.karlsson@...el.com>
> > Reported-by: Ryan Goodfellow <rgoodfel@....edu>
>
> Acked-by: Jonathan Lemon <jonathan.lemon@...il.com>

Applied. Thanks