linux-kernel - Re: [PATCH v2] docs: sysctl/kernel: document BPF entries

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Date:   Tue, 10 Mar 2020 22:57:02 +0100
From:   Stephen Kitt <steve@....org>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>, bpf <bpf@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] docs: sysctl/kernel: document BPF entries

On Tue, 10 Mar 2020 10:47:15 -0700, Alexei Starovoitov
<alexei.starovoitov@...il.com> wrote:

> On Mon, Mar 9, 2020 at 11:05 AM Stephen Kitt <steve@....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@....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.

Oh dear, sorry about that, v3 is on its way :-(.

Regards,

Stephen

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