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    Subject[PATCH 33/44] perf annotate: Add function header to --stdio2
    Date
    From: Arnaldo Carvalho de Melo <acme@redhat.com>

    # perf annotate --stdio2 _raw_spin_lock_irqsave
    _raw_spin_lock_irqsave() /lib/modules/4.16.0-rc4/build/vmlinux
    Event: anon group { cycles, instructions }

    0.00 3.17 → callq __fentry__
    0.00 7.94 push %rbx
    7.69 36.51 → callq __page_file_index
    mov %rax,%rbx
    7.69 3.17 → callq *ffffffff82225cd0
    xor %eax,%eax
    mov $0x1,%edx
    80.77 49.21 lock cmpxchg %edx,(%rdi)
    test %eax,%eax
    ↓ jne 2b
    3.85 0.00 mov %rbx,%rax
    pop %rbx
    ← retq
    2b: mov %eax,%esi
    → callq queued_spin_lock_slowpath
    mov %rbx,%rax
    pop %rbx
    ← retq
    #

    Cc: Adrian Hunter <adrian.hunter@intel.com>
    Cc: Andi Kleen <ak@linux.intel.com>
    Cc: David Ahern <dsahern@gmail.com>
    Cc: Jin Yao <yao.jin@linux.intel.com>
    Cc: Jiri Olsa <jolsa@kernel.org>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Cc: Wang Nan <wangnan0@huawei.com>
    Link: https://lkml.kernel.org/n/tip-i86yfyzl8m194ioxgj1jo32f@git.kernel.org
    Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
    ---
    tools/perf/util/annotate.c | 8 ++++++++
    1 file changed, 8 insertions(+)

    diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
    index ea83b9754ab0..7a6a85f9fea6 100644
    --- a/tools/perf/util/annotate.c
    +++ b/tools/perf/util/annotate.c
    @@ -2244,6 +2244,8 @@ int symbol__tty_annotate2(struct symbol *sym, struct map *map,
    struct dso *dso = map->dso;
    struct rb_root source_line = RB_ROOT;
    struct annotation_options opts = annotation__default_options;
    + const char *ev_name = perf_evsel__name(evsel);
    + char buf[1024];

    if (symbol__annotate2(sym, map, evsel, &opts, NULL) < 0)
    return -1;
    @@ -2254,6 +2256,12 @@ int symbol__tty_annotate2(struct symbol *sym, struct map *map,
    print_summary(&source_line, dso->long_name);
    }

    + if (perf_evsel__is_group_event(evsel)) {
    + perf_evsel__group_desc(evsel, buf, sizeof(buf));
    + ev_name = buf;
    + }
    +
    + fprintf(stdout, "%s() %s\nEvent: %s\n\n", sym->name, dso->long_name, ev_name);
    symbol__annotate_fprintf2(sym, stdout);

    annotated_source__purge(symbol__annotation(sym)->src);
    --
    2.14.3
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