From: Jiri Olsa <jolsa@redhat.com>
To: "Björn Töpel" <bjorn.topel@gmail.com>
Cc: "Jiri Olsa" <jolsa@kernel.org>,
"Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
Netdev <netdev@vger.kernel.org>, bpf <bpf@vger.kernel.org>,
"Andrii Nakryiko" <andriin@fb.com>, "Yonghong Song" <yhs@fb.com>,
"Song Liu" <songliubraving@fb.com>,
"Martin KaFai Lau" <kafai@fb.com>,
"Jakub Kicinski" <kuba@kernel.org>,
"David Miller" <davem@redhat.com>,
"Björn Töpel" <bjorn.topel@intel.com>,
"John Fastabend" <john.fastabend@gmail.com>,
"Jesper Dangaard Brouer" <hawk@kernel.org>
Subject: Re: [PATCH 00/14] bpf: Add trampoline and dispatcher to /proc/kallsyms
Date: Mon, 10 Feb 2020 17:17:51 +0100 [thread overview]
Message-ID: <20200210161751.GC28110@krava> (raw)
In-Reply-To: <CAJ+HfNhBDU9c4-0D5RiHFZBq_LN7E=k8=rhL+VbmxJU7rdDBxQ@mail.gmail.com>
On Mon, Feb 10, 2020 at 04:51:08PM +0100, Björn Töpel wrote:
> On Sat, 8 Feb 2020 at 16:42, Jiri Olsa <jolsa@kernel.org> wrote:
> >
> > hi,
> > this patchset adds trampoline and dispatcher objects
> > to be visible in /proc/kallsyms. The last patch also
> > adds sorting for all bpf objects in /proc/kallsyms.
> >
>
> Thanks for working on this!
>
> I'm probably missing something with my perf setup; I've applied your
> patches, and everything seem to work fine from an kallsyms
> perspective:
>
> # grep bpf_dispatcher_xdp /proc/kallsyms
> ...
> ffffffffc0511000 t bpf_dispatcher_xdp [bpf]
>
> However, when I run
> # perf top
>
> I still see the undecorated one:
> 0.90% [unknown] [k] 0xffffffffc0511037
>
> Any ideas?
yea strange.. it should be picked up from /proc/kallsyms as
fallback if there's no other source, I'll check on that
(might be the problem with perf depending on address going
only higher in /proc/kallsyms, while bpf symbols are at the
end and start over from the lowest bpf address)
anyway, in perf we enumerate bpf_progs via the perf events
PERF_BPF_EVENT_PROG_LOAD,PERF_BPF_EVENT_PROG_UNLOAD interface
together with PERF_RECORD_KSYMBOL_TYPE_BPF events
we might need to add something like:
PERF_RECORD_KSYMBOL_TYPE_BPF_TRAMPOLINE
PERF_RECORD_KSYMBOL_TYPE_BPF_DISPATCHER
to notify about the area, I'll check on that
however the /proc/kallsyms fallback should work in any
case.. thanks for report ;-)
jirka
next prev parent reply other threads:[~2020-02-10 16:18 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-08 15:41 [PATCH 00/14] bpf: Add trampoline and dispatcher to /proc/kallsyms Jiri Olsa
2020-02-08 15:41 ` [PATCH 01/14] x86/mm: Rename is_kernel_text to __is_kernel_text Jiri Olsa
2020-02-08 15:41 ` [PATCH 02/14] bpf: Add bpf_trampoline_ name prefix for DECLARE_BPF_DISPATCHER Jiri Olsa
2020-02-08 15:41 ` [PATCH 03/14] bpf: Add struct bpf_ksym Jiri Olsa
2020-02-08 15:41 ` [PATCH 04/14] bpf: Add name to " Jiri Olsa
2020-02-08 15:42 ` [PATCH 05/14] bpf: Add lnode list node " Jiri Olsa
2020-02-08 15:42 ` [PATCH 06/14] bpf: Add bpf_kallsyms_tree tree Jiri Olsa
2020-02-11 18:21 ` Andrii Nakryiko
2020-02-12 10:49 ` Jiri Olsa
2020-02-08 15:42 ` [PATCH 07/14] bpf: Move bpf_tree add/del from bpf_prog_ksym_node_add/del Jiri Olsa
2020-02-08 15:42 ` [PATCH 08/14] bpf: Separate kallsyms add/del functions Jiri Olsa
2020-02-08 15:42 ` [PATCH 09/14] bpf: Add bpf_ksym_add/del functions Jiri Olsa
2020-02-08 15:42 ` [PATCH 10/14] bpf: Re-initialize lnode in bpf_ksym_del Jiri Olsa
2020-02-11 18:28 ` Andrii Nakryiko
2020-02-12 10:43 ` Jiri Olsa
2020-02-08 15:42 ` [PATCH 11/14] bpf: Rename bpf_tree to bpf_progs_tree Jiri Olsa
2020-02-08 15:42 ` [PATCH 12/14] bpf: Add trampolines to kallsyms Jiri Olsa
2020-02-11 18:51 ` Andrii Nakryiko
2020-02-12 11:10 ` Jiri Olsa
2020-02-12 16:33 ` Andrii Nakryiko
2020-02-12 22:58 ` Jiri Olsa
2020-02-12 23:02 ` Jiri Olsa
2020-02-08 15:42 ` [PATCH 13/14] bpf: Add dispatchers " Jiri Olsa
2020-02-11 19:03 ` Andrii Nakryiko
2020-02-12 10:52 ` Jiri Olsa
2020-02-08 15:42 ` [PATCH 14/14] bpf: Sort bpf kallsyms symbols Jiri Olsa
2020-02-11 19:12 ` Andrii Nakryiko
2020-02-10 15:51 ` [PATCH 00/14] bpf: Add trampoline and dispatcher to /proc/kallsyms Björn Töpel
2020-02-10 16:17 ` Jiri Olsa [this message]
2020-02-11 19:32 ` Arnaldo Carvalho de Melo
2020-02-12 11:13 ` Jiri Olsa
2020-02-12 13:31 ` Arnaldo Carvalho de Melo
2020-02-12 22:40 ` Jiri Olsa
2020-02-13 16:23 ` Jiri Olsa
2020-02-11 19:13 ` Arnaldo Carvalho de Melo
2020-02-12 10:46 ` Jiri Olsa
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