Enable support for ref-cycles perf counter in QtTestLib.

The ref-cycles counter corresponds to the monotonic timestamp counter
that can be read using the RDTSC assembler instruction. Using it
instead of the default cycles counter is useful as it removes the
effect of dynamic frequency scaling on the measurement.

[ChangeLog][QtTest] The ref-cycles perf counter can now be used.

Change-Id: Id7d56576db362706c20f9a399e5acea35ee799f2
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/testlib/qbenchmarkmetric.h b/src/testlib/qbenchmarkmetric.h
index 44bf14b9b6..6e423473b1 100644
--- a/src/testlib/qbenchmarkmetric.h
+++ b/src/testlib/qbenchmarkmetric.h
@@ -78,7 +78,8 @@ enum QBenchmarkMetric {
     MinorPageFaults,
     MajorPageFaults,
     AlignmentFaults,
-    EmulationFaults
+    EmulationFaults,
+    RefCPUCycles,
 };
 
 }