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Subject[PATCH 3/3] perf test: Add callchain order setup for DWARF unwinder test
Date
Adding callchain order setup for DWARF unwinder test. The test
now runs unwinder for both callee and caller orders.

Link: http://lkml.kernel.org/n/tip-zz3q3vrre3re8efdw3c89aef@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/tests/dwarf-unwind.c | 22 +++++++++++++++++++---
1 file changed, 19 insertions(+), 3 deletions(-)

diff --git a/tools/perf/tests/dwarf-unwind.c b/tools/perf/tests/dwarf-unwind.c
index 07221793a3ac..05d9ba387c43 100644
--- a/tools/perf/tests/dwarf-unwind.c
+++ b/tools/perf/tests/dwarf-unwind.c
@@ -51,6 +51,12 @@ static int unwind_entry(struct unwind_entry *entry, void *arg)
"krava_1",
"test__dwarf_unwind"
};
+ /*
+ * The funcs[MAX_STACK] array index, based on the
+ * callchain order setup.
+ */
+ int idx = callchain_param.order == ORDER_CALLER ?
+ MAX_STACK - *cnt - 1 : *cnt;

if (*cnt >= MAX_STACK) {
pr_debug("failed: crossed the max stack value %d\n", MAX_STACK);
@@ -63,8 +69,10 @@ static int unwind_entry(struct unwind_entry *entry, void *arg)
return -1;
}

- pr_debug("got: %s 0x%" PRIx64 "\n", symbol, entry->ip);
- return strcmp((const char *) symbol, funcs[(*cnt)++]);
+ (*cnt)++;
+ pr_debug("got: %s 0x%" PRIx64 ", expecting %s\n",
+ symbol, entry->ip, funcs[idx]);
+ return strcmp((const char *) symbol, funcs[idx]);
}

__attribute__ ((noinline))
@@ -105,8 +113,16 @@ static int compare(void *p1, void *p2)
/* Any possible value should be 'thread' */
struct thread *thread = *(struct thread **)p1;

- if (global_unwind_retval == -INT_MAX)
+ if (global_unwind_retval == -INT_MAX) {
+ /* Call unwinder twice for both callchain orders. */
+ callchain_param.order = ORDER_CALLER;
+
global_unwind_retval = unwind_thread(thread);
+ if (!global_unwind_retval) {
+ callchain_param.order = ORDER_CALLEE;
+ global_unwind_retval = unwind_thread(thread);
+ }
+ }

return p1 - p2;
}
--
2.4.3


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