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authorMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>2011-08-11 20:02:59 +0900
committerArnaldo Carvalho de Melo <acme@redhat.com>2011-08-12 09:28:45 -0300
commit221d061182b8ff5507d5768aeeecbc74f01c5dfa (patch)
tree79cd224ca76fd520e089860a3a0482ed2b718b0d /tools/perf/util/dwarf-aux.c
parent13e27d7686c457c625242fc2c20be30eef942408 (diff)
perf probe: Fix to search local variables in appropriate scope
Fix perf probe to search local variables in appropriate local inlined function scope. For example, pre_schedule() has only 2 local variables, as below; $ perf probe -L pre_schedule <pre_schedule@/home/mhiramat/ksrc/linux-2.6/kernel/sched.c:0> 0 static inline void pre_schedule(struct rq *rq, struct task_struct *prev) { 2 if (prev->sched_class->pre_schedule) 3 prev->sched_class->pre_schedule(rq, prev); } However, current perf probe shows 4 local variables on pre_schedule(), because it searches variables in the caller(schedule()) scope. $ perf probe -V pre_schedule Available variables at pre_schedule @<schedule+445> int cpu long unsigned int* switch_count struct rq* rq struct task_struct* prev This patch fixes this issue by searching variables in the local scope of the instance of inlined function. Here is the result. $ perf probe -V pre_schedule Available variables at pre_schedule @<schedule+445> struct rq* rq struct task_struct* prev Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Paul Mackerras <paulus@samba.org> Cc: Pekka Enberg <penberg@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: yrl.pp-manager.tt@hitachi.com Link: http://lkml.kernel.org/r/20110811110259.19900.85664.stgit@fedora15 Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/dwarf-aux.c')
-rw-r--r--tools/perf/util/dwarf-aux.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c
index d9b8ad098498..425703a58638 100644
--- a/tools/perf/util/dwarf-aux.c
+++ b/tools/perf/util/dwarf-aux.c
@@ -96,6 +96,39 @@ int cu_find_lineinfo(Dwarf_Die *cu_die, unsigned long addr,
return *lineno ?: -ENOENT;
}
+static int __die_find_inline_cb(Dwarf_Die *die_mem, void *data);
+
+/**
+ * cu_walk_functions_at - Walk on function DIEs at given address
+ * @cu_die: A CU DIE
+ * @addr: An address
+ * @callback: A callback which called with found DIEs
+ * @data: A user data
+ *
+ * Walk on function DIEs at given @addr in @cu_die. Passed DIEs
+ * should be subprogram or inlined-subroutines.
+ */
+int cu_walk_functions_at(Dwarf_Die *cu_die, Dwarf_Addr addr,
+ int (*callback)(Dwarf_Die *, void *), void *data)
+{
+ Dwarf_Die die_mem;
+ Dwarf_Die *sc_die;
+ int ret = -ENOENT;
+
+ /* Inlined function could be recursive. Trace it until fail */
+ for (sc_die = die_find_realfunc(cu_die, addr, &die_mem);
+ sc_die != NULL;
+ sc_die = die_find_child(sc_die, __die_find_inline_cb, &addr,
+ &die_mem)) {
+ ret = callback(sc_die, data);
+ if (ret)
+ break;
+ }
+
+ return ret;
+
+}
+
/**
* die_compare_name - Compare diename and tname
* @dw_die: a DIE