From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Stephen Kitt <steve@sk2.org>
Cc: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>, Andrii Nakryiko <andriin@fb.com>,
bpf <bpf@vger.kernel.org>,
"open list:DOCUMENTATION" <linux-doc@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2] docs: sysctl/kernel: document BPF entries
Date: Tue, 10 Mar 2020 10:47:15 -0700 [thread overview]
Message-ID: <CAADnVQJ0EephJiY8F5KJFbYPBg2=hTHOi3WOUtVFE=qgoVbSuA@mail.gmail.com> (raw)
In-Reply-To: <20200309180350.21075-1-steve@sk2.org>
On Mon, Mar 9, 2020 at 11:05 AM Stephen Kitt <steve@sk2.org> wrote:
>
> Based on the implementation in kernel/bpf/syscall.c,
> kernel/bpf/trampoline.c, include/linux/filter.h, and the documentation
> in bpftool-prog.rst.
>
> The section style doesn't match the surrounding sections; it matches
> the style of the reworked kernel.rst queued up in docs-next.
>
> Signed-off-by: Stephen Kitt <steve@sk2.org>
> ---
>
> Notes:
> Changes since v1:
> - rebased on bpf-next instead of docs-next.
>
> Documentation/admin-guide/sysctl/kernel.rst | 24 +++++++++++++++++++++
> 1 file changed, 24 insertions(+)
>
> diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst
> index def074807cee..eea7afd509ac 100644
> --- a/Documentation/admin-guide/sysctl/kernel.rst
> +++ b/Documentation/admin-guide/sysctl/kernel.rst
> @@ -174,6 +174,20 @@ See the type_of_loader and ext_loader_ver fields in
> Documentation/x86/boot.rst for additional information.
>
>
> +bpf_stats_enabled
> +=================
> +
> +Controls whether the kernel should collect statistics on BPF programs
> +(total time spent running, number of times run...). Enabling
> +statistics causes a slight reduction in performance on each program
> +run. The statistics can be seen using ``bpftool``.
> +
> += ===================================
> +0 Don't collect statistics (default).
> +1 Collect statistics.
> += ===================================
> +
> +
> cap_last_cap:
> =============
>
> @@ -1123,6 +1137,16 @@ NMI switch that most IA32 servers have fires unknown NMI up, for
> example. If a system hangs up, try pressing the NMI switch.
>
>
> +unprivileged_bpf_disabled
> +=========================
> +
> +Writing 1 to this entry will disabled unprivileged calls to ``bpf()``;
same typo as was pointed out earlier.
next prev parent reply other threads:[~2020-03-10 17:47 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-09 18:03 [PATCH v2] docs: sysctl/kernel: document BPF entries Stephen Kitt
2020-03-10 17:47 ` Alexei Starovoitov [this message]
2020-03-10 21:57 ` Stephen Kitt
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