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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: Thu, 13 Feb 2020 17:23:42 +0100
Message-ID: <20200213162342.GB296320@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?

heya,
the code is little rusty and needs some fixing :-\

with the patch below on top of Arnaldo's perf/urgent branch,
there's one workaround for now:

  # perf record --vmlinux /proc/kallsyms 
  ^C[ perf record: Woken up 0 times to write data ]
  [ perf record: Captured and wrote 18.954 MB perf.data (348693 samples) ]

  # perf report --kallsyms /proc/kallsyms | grep bpf_trampoline_13795
     0.01%  sched-messaging  kallsyms                                [k] bpf_trampoline_13795
     0.00%  perf             kallsyms                                [k] bpf_trampoline_13795
     0.00%  :47547           kallsyms                                [k] bpf_trampoline_13795
     0.00%  :47546           kallsyms                                [k] bpf_trampoline_13795
     0.00%  :47544           kallsyms                                [k] bpf_trampoline_13795

with recent kcore/vmlinux changes we neglected kallsyms fallback,
I'm preparing changes that will detect and use it automaticaly

jirka


---
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index fb5c2cd44d30..463ada5117f8 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -742,6 +742,7 @@ static int machine__process_ksymbol_register(struct machine *machine,
 		map->start = event->ksymbol.addr;
 		map->end = map->start + event->ksymbol.len;
 		maps__insert(&machine->kmaps, map);
+		dso__set_loaded(dso);
 	}
 
 	sym = symbol__new(map->map_ip(map, map->start),


  parent reply index

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-08 15:41 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
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 [this message]
2020-02-11 19:13 ` Arnaldo Carvalho de Melo
2020-02-12 10:46   ` Jiri Olsa

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