From: Song Liu <songliubraving@fb.com>
To: Jiri Olsa <jolsa@redhat.com>
Cc: Networking <netdev@vger.kernel.org>, bpf <bpf@vger.kernel.org>,
"quentin@isovalent.com" <quentin@isovalent.com>,
Kernel Team <Kernel-team@fb.com>,
"ast@kernel.org" <ast@kernel.org>,
"daniel@iogearbox.net" <daniel@iogearbox.net>,
"arnaldo.melo@gmail.com" <arnaldo.melo@gmail.com>,
"jolsa@kernel.org" <jolsa@kernel.org>
Subject: Re: [PATCH v4 bpf-next 0/4] bpftool: introduce prog profile
Date: Wed, 4 Mar 2020 21:39:52 +0000 [thread overview]
Message-ID: <4C0824FE-37CB-4660-BAE0-0EAE8F6BF8A0@fb.com> (raw)
In-Reply-To: <20200304212931.GE168640@krava>
> On Mar 4, 2020, at 1:29 PM, Jiri Olsa <jolsa@redhat.com> wrote:
>
> On Wed, Mar 04, 2020 at 09:16:29PM +0000, Song Liu wrote:
>>
>>
>>> On Mar 4, 2020, at 12:41 PM, Jiri Olsa <jolsa@redhat.com> wrote:
>>>
>>> On Wed, Mar 04, 2020 at 08:08:07PM +0100, Jiri Olsa wrote:
>>>> On Wed, Mar 04, 2020 at 10:07:06AM -0800, Song Liu wrote:
>>>>> This set introduces bpftool prog profile command, which uses hardware
>>>>> counters to profile BPF programs.
>>>>>
>>>>> This command attaches fentry/fexit programs to a target program. These two
>>>>> programs read hardware counters before and after the target program and
>>>>> calculate the difference.
>>>>>
>>>>> Changes v3 => v4:
>>>>> 1. Simplify err handling in profile_open_perf_events() (Quentin);
>>>>> 2. Remove redundant p_err() (Quentin);
>>>>> 3. Replace tab with space in bash-completion; (Quentin);
>>>>> 4. Fix typo _bpftool_get_map_names => _bpftool_get_prog_names (Quentin).
>>>>
>>>> hum, I'm getting:
>>>>
>>>> [jolsa@dell-r440-01 bpftool]$ pwd
>>>> /home/jolsa/linux-perf/tools/bpf/bpftool
>>>> [jolsa@dell-r440-01 bpftool]$ make
>>>> ...
>>>> make[1]: Leaving directory '/home/jolsa/linux-perf/tools/lib/bpf'
>>>> LINK _bpftool
>>>> make: *** No rule to make target 'skeleton/profiler.bpf.c', needed by 'skeleton/profiler.bpf.o'. Stop.
>>>
>>> ok, I had to apply your patches by hand, because 'git am' refused to
>>> due to fuzz.. so some of you new files did not make it to my tree ;-)
>>>
>>> anyway I hit another error now:
>>>
>>> CC prog.o
>>> In file included from prog.c:1553:
>>> profiler.skel.h: In function ‘profiler_bpf__create_skeleton’:
>>> profiler.skel.h:136:35: error: ‘struct profiler_bpf’ has no member named ‘rodata’
>>> 136 | s->maps[4].mmaped = (void **)&obj->rodata;
>>> | ^~
>>> prog.c: In function ‘profile_read_values’:
>>> prog.c:1650:29: error: ‘struct profiler_bpf’ has no member named ‘rodata’
>>> 1650 | __u32 m, cpu, num_cpu = obj->rodata->num_cpu;
>>>
>>> I'll try to figure it out.. might be error on my end
>>>
>>> do you have git repo with these changes?
>>
>> I pushed it to
>>
>> https://git.kernel.org/pub/scm/linux/kernel/git/song/linux.git/tree/?h=bpf-per-prog-stats
>
> still the same:
>
> [jolsa@dell-r440-01 bpftool]$ git show --oneline HEAD | head -1
> 7bbda5cca00a bpftool: fix typo in bash-completion
> [jolsa@dell-r440-01 bpftool]$ make
> make[1]: Entering directory '/home/jolsa/linux-perf/tools/lib/bpf'
> make[1]: Leaving directory '/home/jolsa/linux-perf/tools/lib/bpf'
> CC prog.o
> In file included from prog.c:1553:
> profiler.skel.h: In function ‘profiler_bpf__create_skeleton’:
> profiler.skel.h:136:35: error: ‘struct profiler_bpf’ has no member named ‘rodata’
> 136 | s->maps[4].mmaped = (void **)&obj->rodata;
> | ^~
> prog.c: In function ‘profile_read_values’:
> prog.c:1650:29: error: ‘struct profiler_bpf’ has no member named ‘rodata’
> 1650 | __u32 m, cpu, num_cpu = obj->rodata->num_cpu;
> | ^~
> prog.c: In function ‘profile_open_perf_events’:
> prog.c:1810:19: error: ‘struct profiler_bpf’ has no member named ‘rodata’
> 1810 | sizeof(int), obj->rodata->num_cpu * obj->rodata->num_metric);
> | ^~
> prog.c:1810:42: error: ‘struct profiler_bpf’ has no member named ‘rodata’
> 1810 | sizeof(int), obj->rodata->num_cpu * obj->rodata->num_metric);
> | ^~
> prog.c:1825:26: error: ‘struct profiler_bpf’ has no member named ‘rodata’
> 1825 | for (cpu = 0; cpu < obj->rodata->num_cpu; cpu++) {
> | ^~
> prog.c: In function ‘do_profile’:
> prog.c:1904:13: error: ‘struct profiler_bpf’ has no member named ‘rodata’
> 1904 | profile_obj->rodata->num_cpu = num_cpu;
> | ^~
> prog.c:1905:13: error: ‘struct profiler_bpf’ has no member named ‘rodata’
> 1905 | profile_obj->rodata->num_metric = num_metric;
> | ^~
> make: *** [Makefile:129: prog.o] Error 1
I guess you need a newer version of clang that supports global data in BPF programs.
Thanks,
Song
next prev parent reply other threads:[~2020-03-04 21:40 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-04 18:07 [PATCH v4 bpf-next 0/4] bpftool: introduce prog profile Song Liu
2020-03-04 18:07 ` [PATCH v4 bpf-next 1/4] bpftool: introduce "prog profile" command Song Liu
2020-03-04 19:21 ` Jiri Olsa
2020-03-04 21:17 ` Song Liu
2020-03-04 20:38 ` Jiri Olsa
2020-03-05 20:03 ` Song Liu
2020-03-04 18:07 ` [PATCH v4 bpf-next 2/4] bpftool: Documentation for bpftool prog profile Song Liu
2020-03-04 18:07 ` [PATCH v4 bpf-next 3/4] bpftool: bash completion for "bpftool prog profile" Song Liu
2020-03-04 18:07 ` [PATCH v4 bpf-next 4/4] bpftool: fix typo in bash-completion Song Liu
2020-03-04 19:08 ` [PATCH v4 bpf-next 0/4] bpftool: introduce prog profile Jiri Olsa
2020-03-04 20:41 ` Jiri Olsa
2020-03-04 21:16 ` Song Liu
2020-03-04 21:29 ` Jiri Olsa
2020-03-04 21:39 ` Song Liu [this message]
2020-03-05 20:03 ` Song Liu
2020-03-06 8:51 ` Jiri Olsa
2020-03-09 18:04 ` Quentin Monnet
2020-03-09 18:24 ` Song Liu
2020-03-09 19:30 ` Jiri Olsa
2020-03-04 19:13 ` Quentin Monnet
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