netdev - Re: [PATCH bpf-next 4/4] bpf: export bpf_jit

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Message-ID: <871r5aglsh.fsf@cloudflare.com>
Date:   Mon, 27 Sep 2021 16:01:18 +0200
From:   Jakub Sitnicki <jakub@...udflare.com>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     Lorenz Bauer <lmb@...udflare.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, kernel-team@...udflare.com,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next 4/4] bpf: export bpf_jit_current

On Mon, Sep 27, 2021 at 03:34 PM CEST, Daniel Borkmann wrote:
> On 9/24/21 11:55 AM, Lorenz Bauer wrote:
>> Expose bpf_jit_current as a read only value via sysctl.
>> Signed-off-by: Lorenz Bauer <lmb@...udflare.com>
>> ---

I find exposing stats via system configuration variables a bit
unexpected. Not sure if there is any example today that we're following.

Maybe an entry under /sys/kernel/debug would be a better fit?

That way we don't have to commit to a sysctl that might go away if we
start charging JIT allocs against memory cgroup quota.

Although that brings up question against which cgroup iptables xt_bpf
allocations should be charged? Root cgroup?