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>

diff --git a/tools/perf/tests/dwarf-unwind.c b/tools/perf/tests/dwarf-unwind.c
index 01f0b61..b2357e8 100644 (file)
--- 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;
 }