[PATCH] buildstats.sh: add ELAPSED option

[liu.ming50@gmail.com]

From: Ming Liu <peter.x.liu@external.atlascopco.com>

This allows users to be able to get the elapsed time of specific
tasks from buildstats, sometimes could be useful.

Signed-off-by: Ming Liu <peter.x.liu@external.atlascopco.com>
---
 scripts/contrib/bb-perf/buildstats.sh | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/scripts/contrib/bb-perf/buildstats.sh b/scripts/contrib/bb-perf/buildstats.sh
index 8d7e248..caf34a6 100755
--- a/scripts/contrib/bb-perf/buildstats.sh
+++ b/scripts/contrib/bb-perf/buildstats.sh
@@ -40,6 +40,7 @@
 
 # Stats, by type
 TIME="utime:stime:cutime:cstime"
+ELAPSED="Started:Ended:Elapsed time"
 IO="IO wchar:IO write_bytes:IO syscr:IO read_bytes:IO rchar:IO syscw:IO cancelled_write_bytes"
 RUSAGE="rusage ru_utime:rusage ru_stime:rusage ru_maxrss:rusage ru_minflt:rusage ru_majflt:\
 rusage ru_inblock:rusage ru_oublock:rusage ru_nvcsw:rusage ru_nivcsw"
@@ -113,6 +114,9 @@ for stat in ${STATS}; do
 	    TIME)
 		stats="${stats}:${TIME}"
 		;;
+	    ELAPSED)
+		stats="${stats}:${ELAPSED}"
+		;;
 	    IO)
 		stats="${stats}:${IO}"
 		;;
-- 
2.7.4