SapMachine SAP#2088: Failure in VitalsValuesSanityCheck

Author: schmelter-sap

test/hotspot/jtreg/runtime/Vitals/VitalsValuesSanityCheck.java

@@ -319,8 +319,12 @@ public void run(CommandExecutor executor) {
                 // we should not see mlc > rss
                 if (jvm_nmt_mlc != -1) {
                     if (Platform.isDebugBuild()) {
-                        if (proc_rss_all < jvm_nmt_mlc) {
-                            throw new RuntimeException("NMT mlc higher than RSS?");
+                        // Give a little slack for two reasons:
+                        // - Not all allocated memory has to be in RSS, since some could be swapped out.
+                        // - The peak RSS and peak malloc size are not taken at the exactly same time.
+                        // Both should not lead to a large difference, so we allow a 25 percent deviation.
+                        if (proc_rss_all * 1.25 <= jvm_nmt_mlc) {
+                            throw new RuntimeException("NMT mlc more than 25 percent higher than RSS?");
                         }
                     }
                 }