perf tests: Adjust some message log levels to help diagnosing problems in attr tests

Now we'll see the command being run and if it fails, the fields that had
unexpected values and the expected values, example testing a problem in the
next patch:

  # perf test -v 13
  13: struct perf_event_attr setup                           :
  --- start ---
  SNIP
    running 'PERF_TEST_ATTR=/tmp/tmpDNIE6M /home/acme/bin/perf record -o /tmp/tmpDNIE6M/perf.data --group -e cycles,instructions kill >/dev/null 2>&1' ret 0
    running 'PERF_TEST_ATTR=/tmp/tmpV5lKro /home/acme/bin/perf stat -o /tmp/tmpV5lKro/perf.data -dd kill >/dev/null 2>&1' ret 1
  expected config=3, got 65540
  expected exclude_guest=1, got 0
  FAILED '/home/acme/libexec/perf-core/tests/attr/test-stat-detailed-2' - match failure
  ---- end ----
  struct perf_event_attr setup: FAILED!
  #

While in the past we would see at the '-v' level many more messages for the
fields that matched, something we may want to see only in the '-vv' log level.

Keeping the 'running' messages so that we can see the tools tests that
succeeded so that we can compare it to the one that failed, helping pinpointing
the command line switch combo that leads to the problem.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-9avmwxv5ipxyafwqxbk52ylg@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/attr.py

@@ -68,7 +68,7 @@ class Event(dict):
             self[key] = val
 
     def __init__(self, name, data, base):
-        log.info("    Event %s" % name);
+        log.debug("    Event %s" % name);
         self.name  = name;
         self.group = ''
         self.add(base)
@@ -97,6 +97,14 @@ class Event(dict):
                 return False
         return True
 
+    def diff(self, other):
+        for t in Event.terms:
+            if not self.has_key(t) or not other.has_key(t):
+                continue
+            if not self.compare_data(self[t], other[t]):
+		log.warning("expected %s=%s, got %s" % (t, self[t], other[t]))
+                
+
 # Test file description needs to have following sections:
 # [config]
 #   - just single instance in file
@@ -113,7 +121,7 @@ class Test(object):
         parser = ConfigParser.SafeConfigParser()
         parser.read(path)
 
-        log.warning("running '%s'" % path)
+        log.debug("running '%s'" % path)
 
         self.path     = path
         self.test_dir = options.test_dir
@@ -128,7 +136,7 @@ class Test(object):
 
         self.expect   = {}
         self.result   = {}
-        log.info("  loading expected events");
+        log.debug("  loading expected events");
         self.load_events(path, self.expect)
 
     def is_event(self, name):
@@ -164,7 +172,7 @@ class Test(object):
               self.perf, self.command, tempdir, self.args)
         ret = os.WEXITSTATUS(os.system(cmd))
 
-        log.info("  running '%s' ret %d " % (cmd, ret))
+        log.warning("  running '%s' ret %d " % (cmd, ret))
 
         if ret != int(self.ret):
             raise Unsup(self)
@@ -172,7 +180,7 @@ class Test(object):
     def compare(self, expect, result):
         match = {}
 
-        log.info("  compare");
+        log.debug("  compare");
 
         # For each expected event find all matching
         # events in result. Fail if there's not any.
@@ -187,10 +195,11 @@ class Test(object):
                 else:
                     log.debug("    ->FAIL");
 
-            log.info("    match: [%s] matches %s" % (exp_name, str(exp_list)))
+            log.debug("    match: [%s] matches %s" % (exp_name, str(exp_list)))
 
             # we did not any matching event - fail
             if (not exp_list):
+		exp_event.diff(res_event)
                 raise Fail(self, 'match failure');
 
             match[exp_name] = exp_list
@@ -208,10 +217,10 @@ class Test(object):
                 if res_group not in match[group]:
                     raise Fail(self, 'group failure')
 
-                log.info("    group: [%s] matches group leader %s" %
+                log.debug("    group: [%s] matches group leader %s" %
                          (exp_name, str(match[group])))
 
-        log.info("  matched")
+        log.debug("  matched")
 
     def resolve_groups(self, events):
         for name, event in events.items():
@@ -233,7 +242,7 @@ class Test(object):
             self.run_cmd(tempdir);
 
             # load events expectation for the test
-            log.info("  loading result events");
+            log.debug("  loading result events");
             for f in glob.glob(tempdir + '/event*'):
                 self.load_events(f, self.result);