perf test: Add callchain order setup for DWARF unwinder test

Adding callchain order setup for DWARF unwinder test. The test now runs
unwinder for both callee and caller orders.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Milian Wolff <milian.wolff@kdab.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1447772739-18471-4-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 19 insertions, 3 deletions

diff --git a/tools/perf/tests/dwarf-unwind.c b/tools/perf/tests/dwarf-unwind.c
index 01f0b61de53d..b2357e8115a2 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;
 }