perf tools: Configurable per thread proc map processing time out

The time out to limit the individual proc map processing was hard code
to 500ms. This patch introduce a new option --proc-map-timeout to make
the time limit configurable.

Signed-off-by: Kan Liang <kan.liang@intel.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ying Huang <ying.huang@intel.com>
Link: http://lkml.kernel.org/r/1434549071-25611-2-git-send-email-kan.liang@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/session.c

@@ -1368,7 +1368,9 @@ static void perf_session__warn_about_errors(const struct perf_session *session)
 			    "not processed, if there are samples for addresses they\n"
 			    "will not be resolved, you may find out which are these\n"
 			    "threads by running with -v and redirecting the output\n"
-			    "to a file.\n",
+			    "to a file.\n"
+			    "The time limit to process proc map is too short?\n"
+			    "Increase it by --proc-map-timeout\n",
 			    stats->nr_proc_map_timeout);
 	}
 }