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perf probe: Fix to show ranges of variables in functions without entry_pc

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Fix to show ranges of variables (--range and --vars option) in functions
which DIE has only ranges but no entry_pc attribute.

Without this fix:

  # perf probe --range -V clear_tasks_mm_cpumask
  Available variables at clear_tasks_mm_cpumask
  	@<clear_tasks_mm_cpumask+0>
  		(No matched variables)

With this fix:

  # perf probe --range -V clear_tasks_mm_cpumask
  Available variables at clear_tasks_mm_cpumask
	@<clear_tasks_mm_cpumask+0>
		[VAL]	int	cpu	@<clear_tasks_mm_cpumask+[0-35,317-317,2052-2059]>

Committer testing:

Before:

  [root@quaco ~]# perf probe --range -V clear_tasks_mm_cpumask
  Available variables at clear_tasks_mm_cpumask
          @<clear_tasks_mm_cpumask+0>
                  (No matched variables)
  [root@quaco ~]#

After:

  [root@quaco ~]# perf probe --range -V clear_tasks_mm_cpumask
  Available variables at clear_tasks_mm_cpumask
          @<clear_tasks_mm_cpumask+0>
                  [VAL]   int     cpu     @<clear_tasks_mm_cpumask+[0-23,23-105,105-106,106-106,1843-1850,1850-1862]>
  [root@quaco ~]#

Using it:

  [root@quaco ~]# perf probe clear_tasks_mm_cpumask cpu
  Added new event:
    probe:clear_tasks_mm_cpumask (on clear_tasks_mm_cpumask with cpu)

  You can now use it in all perf tools, such as:

  	perf record -e probe:clear_tasks_mm_cpumask -aR sleep 1

  [root@quaco ~]# perf probe -l
    probe:clear_tasks_mm_cpumask (on clear_tasks_mm_cpumask@kernel/cpu.c with cpu)
  [root@quaco ~]#
  [root@quaco ~]# perf trace -e probe:*cpumask
  ^C[root@quaco ~]#

Fixes: 349e8d2611 ("perf probe: Add --range option to show a variable's location range")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lore.kernel.org/lkml/157199323018.8075.8179744380479673672.stgit@devnote2
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Masami Hiramatsu 2019-10-25 17:47:10 +09:00 committed by Arnaldo Carvalho de Melo
parent 18e21eb671
commit af04dd2f8e
1 changed files with 2 additions and 2 deletions
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4
tools/perf/util/dwarf-aux.c
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@ -1019,7 +1019,7 @@ static int die_get_var_innermost_scope(Dwarf_Die *sp_die, Dwarf_Die *vr_die,
bool first = true;
const char *name;
ret = dwarf_entrypc(sp_die, &entry);
ret = die_entrypc(sp_die, &entry);
if (ret)
return ret;
@ -1082,7 +1082,7 @@ int die_get_var_range(Dwarf_Die *sp_die, Dwarf_Die *vr_die, struct strbuf *buf)
bool first = true;
const char *name;
ret = dwarf_entrypc(sp_die, &entry);
ret = die_entrypc(sp_die, &entry);
if (ret)
return ret;