8270021: Incorrect log decorators in gc/g1/plab/TestPLABEvacuationFai…

…lure.java

Reviewed-by: tschatzl, iwalulya

test/hotspot/jtreg/gc/g1/plab/TestPLABEvacuationFailure.java

@@ -68,7 +68,7 @@
             "failure wasted"));
 
     private static final String[] COMMON_OPTIONS = {
-        "-Xlog:gc=debug,gc+phases=trace",
+        "-Xlog:gc,gc+plab=debug",
         "-XX:+UseG1GC",
         "-XX:InitiatingHeapOccupancyPercent=100",
         "-XX:-G1UseAdaptiveIHOP",

test/hotspot/jtreg/gc/g1/plab/lib/LogParser.java

@@ -190,13 +190,17 @@ public PlabInfo getSpecifiedStats(long specifiedGcId, LogParser.ReportType type,
     }
 
     private Map<Long, PlabInfo> getSpecifiedStats(List<Long> gcIds, LogParser.ReportType type, List<String> fieldNames, boolean extractId) {
-        return new HashMap<>(
-                getEntries().entryStream()
-                .filter(gcLogItem -> extractId == gcIds.contains(gcLogItem.getKey()))
-                .collect(Collectors.toMap(gcLogItem -> gcLogItem.getKey(),
-                                gcLogItem -> gcLogItem.getValue().get(type).filter(fieldNames)
+        var map = new HashMap<>(
+                        getEntries().entryStream()
+                        .filter(gcLogItem -> extractId == gcIds.contains(gcLogItem.getKey()))
+                        .collect(Collectors.toMap(gcLogItem -> gcLogItem.getKey(),
+                                        gcLogItem -> gcLogItem.getValue().get(type).filter(fieldNames)
+                                )
                         )
-                )
-        );
+                 );
+        if (map.isEmpty()) {
+            throw new RuntimeException("Cannot find relevant PLAB statistics in the log");
+        }
+        return map;
     }
 }