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Date: Tue, 19 Mar 2019 06:10:42 +0000
From: Song Liu <songliubraving@...com>
To: Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
CC: "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
Networking <netdev@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"ast@...nel.org" <ast@...nel.org>,
"daniel@...earbox.net" <daniel@...earbox.net>,
Kernel Team <Kernel-team@...com>,
"peterz@...radead.org" <peterz@...radead.org>,
"acme@...hat.com" <acme@...hat.com>,
"jolsa@...nel.org" <jolsa@...nel.org>,
"namhyung@...nel.org" <namhyung@...nel.org>,
"sdf@...ichev.me" <sdf@...ichev.me>
Subject: Re: [PATCH v9 perf,bpf 12/15] perf, bpf: enable annotation of bpf
program
> On Mar 18, 2019, at 9:43 AM, Arnaldo Carvalho de Melo <arnaldo.melo@...il.com> wrote:
>
> Em Mon, Mar 18, 2019 at 01:38:48PM -0300, Arnaldo Carvalho de Melo escreveu:
>> Em Mon, Mar 11, 2019 at 10:30:48PM -0700, Song Liu escreveu:
>>> This patch enables the annotation of bpf program.
>>>
>>> A new dso type DSO_BINARY_TYPE__BPF_PROG_INFO is introduced to for BPF
>>> programs. In symbol__disassemble(), DSO_BINARY_TYPE__BPF_PROG_INFO dso
>>> calls into a new function symbol__disassemble_bpf(), where annotation
>>> line information is filled based bpf_prog_info and btf saved in given
>>> perf_env.
>>>
>>> symbol__disassemble_bpf() uses libbfd to disassemble bpf programs.
>>>
>>> Signed-off-by: Song Liu <songliubraving@...com>
>>> ---
>>> tools/build/Makefile.feature | 6 +-
>>> tools/perf/Makefile.config | 4 +
>>
>> I see the changes to these two files, but I can't see the feature test
>> that it triggers, forgot to do a git-add? Or is it in an upcoming patch
>> in this series?
>>
>> After applying this test it "works":
>>
>> make: Entering directory '/home/acme/git/perf/tools/perf'
>> BUILD: Doing 'make -j8' parallel build
>>
>> Auto-detecting system features:
>> ... dwarf: [ on ]
>> ... dwarf_getlocations: [ on ]
>> <SNIP>
>> ... bpf: [ on ]
>> ... libaio: [ on ]
>> ... disassembler-four-args: [ on ]
>>
>> Because you added it to FEATURE_TESTS_BASIC, and this means that if
>> tools/build/feature/test-all.c builds, then what is in
>> FEATURE_TESTS_BASIC is set to 'on', but you didn't add anything to
>> tools/build/feature/test-all.c, so it works because all the other
>> features are present.
>>
>> Take a look at:
>>
>> 2a07d814747b ("tools build feature: Check if libaio is available")
>>
>> To see what needs to be done.
>>
>> Either way, its interesting to break this patch in two, one adding the
>> feature test and another to use it, i.e. the second patch out of this
>> should have the commit log message in this patch.
>>
>> I've applied the patches up to before this one and will continue
>> processing other patches while you address this.
>
> Ok, to continue processing the other patches I chunked out the part
> below into a 3rd patch from the above one and have it applied already.
Could you please push applied patches to the tmp.perf/bpf-annotation
branch?
Thanks,
Song
>
> commit f326de312abc3657b0397817c66cd7e1540655f7
> Author: Song Liu <songliubraving@...com>
> Date: Mon Mar 11 22:30:48 2019 -0700
>
> perf symbols: Introduce DSO_BINARY_TYPE__BPF_PROG_INFO
>
> Introduce a new dso type DSO_BINARY_TYPE__BPF_PROG_INFO for BPF programs. In
> symbol__disassemble(), DSO_BINARY_TYPE__BPF_PROG_INFO dso will call into a new
> function symbol__disassemble_bpf() in an upcoming patch, where annotation line
> information is filled based bpf_prog_info and btf saved in given perf_env.
>
> Signed-off-by: Song Liu <songliubraving@...com>
> Reviewed-by: Jiri Olsa <jolsa@...nel.org>
> Cc: Alexei Starovoitov <ast@...nel.org>
> Cc: Daniel Borkmann <daniel@...earbox.net>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Stanislav Fomichev <sdf@...gle.com>
> Cc: kernel-team@...com
> Link: http://lkml.kernel.org/r/20190312053051.2690567-13-songliubraving@fb.com
> [ split from a larger patch ]
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
>
> diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
> index ba58ba603b69..58547c468c65 100644
> --- a/tools/perf/util/dso.c
> +++ b/tools/perf/util/dso.c
> @@ -184,6 +184,7 @@ int dso__read_binary_type_filename(const struct dso *dso,
> case DSO_BINARY_TYPE__KALLSYMS:
> case DSO_BINARY_TYPE__GUEST_KALLSYMS:
> case DSO_BINARY_TYPE__JAVA_JIT:
> + case DSO_BINARY_TYPE__BPF_PROG_INFO:
> case DSO_BINARY_TYPE__NOT_FOUND:
> ret = -1;
> break;
> diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h
> index bb417c54c25a..c274b5aa839d 100644
> --- a/tools/perf/util/dso.h
> +++ b/tools/perf/util/dso.h
> @@ -14,6 +14,7 @@
>
> struct machine;
> struct map;
> +struct perf_env;
>
> enum dso_binary_type {
> DSO_BINARY_TYPE__KALLSYMS = 0,
> @@ -35,6 +36,7 @@ enum dso_binary_type {
> DSO_BINARY_TYPE__KCORE,
> DSO_BINARY_TYPE__GUEST_KCORE,
> DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
> + DSO_BINARY_TYPE__BPF_PROG_INFO,
> DSO_BINARY_TYPE__NOT_FOUND,
> };
>
> @@ -178,17 +180,25 @@ struct dso {
> struct auxtrace_cache *auxtrace_cache;
> int comp;
>
> - /* dso data file */
> - struct {
> - struct rb_root cache;
> - int fd;
> - int status;
> - u32 status_seen;
> - size_t file_size;
> - struct list_head open_entry;
> - u64 debug_frame_offset;
> - u64 eh_frame_hdr_offset;
> - } data;
> + union {
> + /* dso data file */
> + struct {
> + struct rb_root cache;
> + int fd;
> + int status;
> + u32 status_seen;
> + size_t file_size;
> + struct list_head open_entry;
> + u64 debug_frame_offset;
> + u64 eh_frame_hdr_offset;
> + } data;
> + /* bpf prog information */
> + struct {
> + u32 id;
> + u32 sub_id;
> + struct perf_env *env;
> + } bpf_prog;
> + };
>
> union { /* Tool specific area */
> void *priv;
> diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
> index 58442ca5e3c4..5cbad55cd99d 100644
> --- a/tools/perf/util/symbol.c
> +++ b/tools/perf/util/symbol.c
> @@ -1455,6 +1455,7 @@ static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
> case DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO:
> return true;
>
> + case DSO_BINARY_TYPE__BPF_PROG_INFO:
> case DSO_BINARY_TYPE__NOT_FOUND:
> default:
> return false;
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