From: Masami Hiramatsu mhiramat@kernel.org
[ Upstream commit af04dd2f8ebaa8fbd46f698714acbf43da14da45 ]
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: 349e8d261131 ("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@devn... Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- tools/perf/util/dwarf-aux.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c index 7e7e572083230..574ba3ac4fbad 100644 --- a/tools/perf/util/dwarf-aux.c +++ b/tools/perf/util/dwarf-aux.c @@ -1007,7 +1007,7 @@ 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;
@@ -1070,7 +1070,7 @@ 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;