From: Jiri Olsa <jolsa@redhat.com>
To: Song Liu <songliubraving@fb.com>
Cc: Networking <netdev@vger.kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
"ast@kernel.org" <ast@kernel.org>,
"daniel@iogearbox.net" <daniel@iogearbox.net>,
Kernel Team <Kernel-team@fb.com>,
"peterz@infradead.org" <peterz@infradead.org>,
"acme@redhat.com" <acme@redhat.com>,
"jolsa@kernel.org" <jolsa@kernel.org>,
"namhyung@kernel.org" <namhyung@kernel.org>
Subject: Re: [PATCH v5 perf,bpf 12/15] perf, bpf: enable annotation of bpf program
Date: Mon, 4 Mar 2019 21:37:13 +0100 [thread overview]
Message-ID: <20190304203713.GC2563@krava> (raw)
In-Reply-To: <01714139-9FE5-4DFF-A299-D758D1871BA0@fb.com>
On Mon, Mar 04, 2019 at 07:45:00PM +0000, Song Liu wrote:
>
>
> > On Mar 4, 2019, at 5:53 AM, Jiri Olsa <jolsa@redhat.com> wrote:
> >
> > On Wed, Feb 27, 2019 at 09:06:40PM -0800, Song Liu wrote:
> >
> > SNIP
> >
> >> + fflush(s);
> >> + do {
> >> + const struct bpf_line_info *linfo = NULL;
> >> + struct disasm_line *dl;
> >> + size_t prev_buf_size;
> >> + const char *srcline;
> >> + u64 addr;
> >> +
> >> + addr = pc + ((u64 *)(info_linear->info.jited_ksyms))[sub_id];
> >> + count = disassemble(pc, &info);
> >> +
> >> + if (prog_linfo)
> >> + linfo = bpf_prog_linfo__lfind_addr_func(prog_linfo,
> >> + addr, sub_id,
> >> + nr_skip);
> >> +
> >> + if (linfo && btf) {
> >> + srcline = btf__name_by_offset(btf, linfo->line_off);
> >> + nr_skip++;
> >> + } else
> >> + srcline = NULL;
> >> +
> >> + fprintf(s, "\n");
> >> + prev_buf_size = buf_size;
> >> + fflush(s);
> >> +
> >> + if (!opts->hide_src_code && srcline) {
> >> + args->offset = -1;
> >
> > why's the offset not needed in here?
>
> This is the source code line. Based on my understanding of annotation
> code, we put -1 for source code line. Did I misunderstand something?
please double check, IIRC annotation_line__print will print
just more info if offset is present, together with the source,
but I haven't checked that code for some time, so I might be wrong
jirka
next prev parent reply other threads:[~2019-03-04 20:37 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-28 5:06 [PATCH v5 perf,bpf 00/15] perf annotation of BPF programs Song Liu
2019-02-28 5:06 ` [PATCH v5 perf,bpf 01/15] perf, bpf: consider events with attr.bpf_event as side-band events Song Liu
2019-02-28 5:06 ` [PATCH v5 perf,bpf 02/15] bpf: libbpf: introduce bpf_program__get_prog_info_linear() Song Liu
2019-02-28 5:06 ` [PATCH v5 perf,bpf 03/15] bpf: bpftool: use bpf_program__get_prog_info_linear() in prog.c:do_dump() Song Liu
2019-02-28 5:06 ` [PATCH v5 perf,bpf 04/15] perf, bpf: synthesize bpf events with bpf_program__get_prog_info_linear() Song Liu
2019-02-28 5:06 ` [PATCH v5 perf,bpf 05/15] perf: change prototype of perf_event__synthesize_bpf_events() Song Liu
2019-02-28 5:06 ` [PATCH v5 perf,bpf 06/15] perf, bpf: save bpf_prog_info in a rbtree in perf_env Song Liu
2019-02-28 5:06 ` [PATCH v5 perf,bpf 07/15] perf, bpf: save bpf_prog_info information as headers to perf.data Song Liu
2019-03-04 13:52 ` Jiri Olsa
2019-03-04 19:36 ` Song Liu
2019-03-04 20:23 ` Jiri Olsa
2019-03-04 20:31 ` Song Liu
2019-03-04 13:52 ` Jiri Olsa
2019-03-04 13:52 ` Jiri Olsa
2019-03-04 19:41 ` Song Liu
2019-03-04 20:37 ` Jiri Olsa
2019-03-04 13:52 ` Jiri Olsa
2019-02-28 5:06 ` [PATCH v5 perf,bpf 08/15] perf, bpf: save btf in a rbtree in perf_env Song Liu
2019-03-04 13:52 ` Jiri Olsa
2019-03-04 19:43 ` Song Liu
2019-03-04 20:31 ` Jiri Olsa
2019-03-04 13:53 ` Jiri Olsa
2019-02-28 5:06 ` [PATCH v5 perf,bpf 09/15] perf, bpf: save btf information as headers to perf.data Song Liu
2019-03-04 13:52 ` Jiri Olsa
2019-02-28 5:06 ` [PATCH v5 perf,bpf 10/15] perf-top: add option --no-bpf-event Song Liu
2019-02-28 5:06 ` [PATCH v5 perf,bpf 11/15] perf: add -lopcodes to feature-libbfd Song Liu
2019-02-28 5:06 ` [PATCH v5 perf,bpf 12/15] perf, bpf: enable annotation of bpf program Song Liu
2019-03-04 13:52 ` Jiri Olsa
2019-03-04 13:53 ` Jiri Olsa
2019-03-04 20:52 ` Song Liu
2019-03-04 13:53 ` Jiri Olsa
2019-03-04 19:45 ` Song Liu
2019-03-04 20:37 ` Jiri Olsa [this message]
2019-03-04 20:43 ` Song Liu
2019-02-28 5:06 ` [PATCH v5 perf,bpf 13/15] perf, bpf: process PERF_BPF_EVENT_PROG_LOAD for annotation Song Liu
2019-03-04 13:53 ` Jiri Olsa
2019-02-28 5:06 ` [PATCH v5 perf,bpf 14/15] perf: introduce side band thread Song Liu
2019-02-28 5:06 ` [PATCH v5 perf,bpf 15/15] perf, bpf: save bpf_prog_info and btf of short living bpf programs Song Liu
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