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perf annotate browser: Add 'P' hotkey to dump annotation to file

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Just like we have in the histograms browser used as the main screen for
'perf top --tui' and 'perf report --tui', to print the current
annotation to a file with a named composed by the symbol name and the
".annotation" suffix.

Here is one example of pressing 'A' on 'perf top' to live annotate a
kernel function and then press 'P' to dump that annotation, the
resulting file:

  # cat _raw_spin_lock_irqsave.annotation
  _raw_spin_lock_irqsave() /proc/kcore
  Event: cycles:ppp

    7.14        nop
   21.43        push   %rbx
    7.14        pushfq
                pop    %rax
                nop
                mov    %rax,%rbx
                cli
                nop
                xor    %eax,%eax
                mov    $0x1,%edx
   64.29        lock   cmpxchg %edx,(%rdi)
                test   %eax,%eax
              ↓ jne    2b
                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-zzmnrwugb5vtk7bvg0rbx150@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo
2018-03-16 16:57:47 -03:00
parent 91340c5184
commit d9bd766584
3 changed files with 37 additions and 0 deletions
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31
tools/perf/util/annotate.c
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@@ -2037,6 +2037,37 @@ int symbol__annotate_fprintf2(struct symbol *sym, FILE *fp)
return 0;
}
int map_symbol__annotation_dump(struct map_symbol *ms, struct perf_evsel *evsel)
{
const char *ev_name = perf_evsel__name(evsel);
char buf[1024];
char *filename;
int err = -1;
FILE *fp;
if (asprintf(&filename, "%s.annotation", ms->sym->name) < 0)
return -1;
fp = fopen(filename, "w");
if (fp == NULL)
goto out_free_filename;
if (perf_evsel__is_group_event(evsel)) {
perf_evsel__group_desc(evsel, buf, sizeof(buf));
ev_name = buf;
}
fprintf(fp, "%s() %s\nEvent: %s\n\n",
ms->sym->name, ms->map->dso->long_name, ev_name);
symbol__annotate_fprintf2(ms->sym, fp);
fclose(fp);
err = 0;
out_free_filename:
free(filename);
return err;
}
void symbol__annotate_zero_histogram(struct symbol *sym, int evidx)
{
struct annotation *notes = symbol__annotation(sym);