# HG changeset patch
# User tschatzl
# Date 1434706027 -7200
# Node ID e27de74354530a3c8be513d9cd8211b24767409e
# Parent  0c3dcc865a1c887830dc6eddf92a6f71ca2cbe81
8078669: G1 applies SurvivorAlignmentInBytes to both survivor and old gen
Summary: After refactoring of the relevant code in JDK-8060025 the survivor alignment had been applied to any allocation within PLABs. Only do that for survivor allocations again. Improve the related tests to have less variance.
Reviewed-by: jmasa, fzhinkin

diff -r 0c3dcc865a1c -r e27de7435453 hotspot/src/share/vm/gc/g1/g1Allocator.hpp
--- a/hotspot/src/share/vm/gc/g1/g1Allocator.hpp	Fri Jun 19 09:41:50 2015 +0200
+++ b/hotspot/src/share/vm/gc/g1/g1Allocator.hpp	Fri Jun 19 11:27:07 2015 +0200
@@ -227,7 +227,7 @@
                           size_t word_sz,
                           AllocationContext_t context) {
     G1PLAB* buffer = alloc_buffer(dest, context);
-    if (_survivor_alignment_bytes == 0) {
+    if (_survivor_alignment_bytes == 0 || !dest.is_young()) {
       return buffer->allocate(word_sz);
     } else {
       return buffer->allocate_aligned(word_sz, _survivor_alignment_bytes);
diff -r 0c3dcc865a1c -r e27de7435453 hotspot/test/gc/survivorAlignment/TestAllocationInEden.java
--- a/hotspot/test/gc/survivorAlignment/TestAllocationInEden.java	Fri Jun 19 09:41:50 2015 +0200
+++ b/hotspot/test/gc/survivorAlignment/TestAllocationInEden.java	Fri Jun 19 11:27:07 2015 +0200
@@ -35,42 +35,42 @@
  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  *                   -XX:+WhiteBoxAPI -XX:NewSize=64m -XX:MaxNewSize=64m
  *                   -XX:SurvivorRatio=1 -XX:+UnlockExperimentalVMOptions
- *                   -XX:SurvivorAlignmentInBytes=32 -XX:-UseTLAB
+ *                   -XX:SurvivorAlignmentInBytes=32 -XX:-UseTLAB -XX:-ResizePLAB
  *                   -XX:OldSize=128m -XX:MaxHeapSize=192m
  *                   -XX:-ExplicitGCInvokesConcurrent
  *                   TestAllocationInEden 10m 9 EDEN
  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  *                   -XX:+WhiteBoxAPI -XX:NewSize=64m -XX:MaxNewSize=64m
  *                   -XX:SurvivorRatio=1 -XX:+UnlockExperimentalVMOptions
- *                   -XX:SurvivorAlignmentInBytes=32 -XX:-UseTLAB
+ *                   -XX:SurvivorAlignmentInBytes=32 -XX:-UseTLAB -XX:-ResizePLAB
  *                   -XX:OldSize=128m -XX:MaxHeapSize=192m
  *                   -XX:-ExplicitGCInvokesConcurrent
  *                   TestAllocationInEden 10m 47 EDEN
  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  *                   -XX:+WhiteBoxAPI -XX:NewSize=64m -XX:MaxNewSize=64m
  *                   -XX:SurvivorRatio=1 -XX:+UnlockExperimentalVMOptions
- *                   -XX:SurvivorAlignmentInBytes=64 -XX:-UseTLAB
+ *                   -XX:SurvivorAlignmentInBytes=64 -XX:-UseTLAB -XX:-ResizePLAB
  *                   -XX:OldSize=128m  -XX:MaxHeapSize=192m
  *                   -XX:-ExplicitGCInvokesConcurrent
  *                   TestAllocationInEden 10m 9 EDEN
  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  *                   -XX:+WhiteBoxAPI -XX:NewSize=64m -XX:MaxNewSize=64m
  *                   -XX:SurvivorRatio=1 -XX:+UnlockExperimentalVMOptions
- *                   -XX:SurvivorAlignmentInBytes=64 -XX:-UseTLAB
+ *                   -XX:SurvivorAlignmentInBytes=64 -XX:-UseTLAB -XX:-ResizePLAB
  *                   -XX:OldSize=128m  -XX:MaxHeapSize=192m
  *                   -XX:-ExplicitGCInvokesConcurrent
  *                   TestAllocationInEden 10m 87 EDEN
  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  *                   -XX:+WhiteBoxAPI -XX:NewSize=64m -XX:MaxNewSize=64m
  *                   -XX:SurvivorRatio=1 -XX:+UnlockExperimentalVMOptions
- *                   -XX:SurvivorAlignmentInBytes=128 -XX:-UseTLAB
+ *                   -XX:SurvivorAlignmentInBytes=128 -XX:-UseTLAB -XX:-ResizePLAB
  *                   -XX:OldSize=128m -XX:MaxHeapSize=192m
  *                   -XX:-ExplicitGCInvokesConcurrent
  *                   TestAllocationInEden 10m 9 EDEN
  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  *                   -XX:+WhiteBoxAPI -XX:NewSize=64m -XX:MaxNewSize=64m
  *                   -XX:SurvivorRatio=1 -XX:+UnlockExperimentalVMOptions
- *                   -XX:SurvivorAlignmentInBytes=128 -XX:-UseTLAB
+ *                   -XX:SurvivorAlignmentInBytes=128 -XX:-UseTLAB -XX:-ResizePLAB
  *                   -XX:OldSize=128m -XX:MaxHeapSize=192m
  *                   -XX:-ExplicitGCInvokesConcurrent
  *                   TestAllocationInEden 10m 147 EDEN
diff -r 0c3dcc865a1c -r e27de7435453 hotspot/test/gc/survivorAlignment/TestPromotionFromEdenToTenured.java
--- a/hotspot/test/gc/survivorAlignment/TestPromotionFromEdenToTenured.java	Fri Jun 19 09:41:50 2015 +0200
+++ b/hotspot/test/gc/survivorAlignment/TestPromotionFromEdenToTenured.java	Fri Jun 19 11:27:07 2015 +0200
@@ -36,42 +36,42 @@
  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  *                   -XX:+WhiteBoxAPI -XX:NewSize=64m -XX:MaxNewSize=64m
  *                   -XX:OldSize=32m -XX:MaxHeapSize=96m -XX:SurvivorRatio=1
- *                   -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:-ExplicitGCInvokesConcurrent -XX:-ResizePLAB
  *                   -XX:+UnlockExperimentalVMOptions
  *                   -XX:SurvivorAlignmentInBytes=32
  *                   TestPromotionFromEdenToTenured 10m 9 TENURED
  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  *                   -XX:+WhiteBoxAPI -XX:NewSize=64m -XX:MaxNewSize=64m
  *                   -XX:OldSize=32m -XX:MaxHeapSize=96m -XX:SurvivorRatio=1
- *                   -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:-ExplicitGCInvokesConcurrent -XX:-ResizePLAB
  *                   -XX:+UnlockExperimentalVMOptions
  *                   -XX:SurvivorAlignmentInBytes=32
  *                   TestPromotionFromEdenToTenured 10m 47 TENURED
  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  *                   -XX:+WhiteBoxAPI -XX:NewSize=64m -XX:MaxNewSize=64m
  *                   -XX:OldSize=32m  -XX:MaxHeapSize=96m
- *                   -XX:SurvivorRatio=1 -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:SurvivorRatio=1 -XX:-ExplicitGCInvokesConcurrent -XX:-ResizePLAB
  *                   -XX:+UnlockExperimentalVMOptions
  *                   -XX:SurvivorAlignmentInBytes=64
  *                   TestPromotionFromEdenToTenured 10m 9 TENURED
  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  *                   -XX:+WhiteBoxAPI -XX:NewSize=64m -XX:MaxNewSize=64m
  *                   -XX:OldSize=32m -XX:MaxHeapSize=128m
- *                   -XX:SurvivorRatio=1 -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:SurvivorRatio=1 -XX:-ExplicitGCInvokesConcurrent -XX:-ResizePLAB
  *                   -XX:+UnlockExperimentalVMOptions
  *                   -XX:SurvivorAlignmentInBytes=64
  *                   TestPromotionFromEdenToTenured 10m 87 TENURED
  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  *                   -XX:+WhiteBoxAPI -XX:NewSize=64m -XX:MaxNewSize=64m
  *                   -XX:OldSize=32M -XX:MaxHeapSize=96m -XX:SurvivorRatio=1
- *                   -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:-ExplicitGCInvokesConcurrent -XX:-ResizePLAB
  *                   -XX:+UnlockExperimentalVMOptions
  *                   -XX:SurvivorAlignmentInBytes=128
  *                   TestPromotionFromEdenToTenured 10m 9 TENURED
  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  *                   -XX:+WhiteBoxAPI -XX:NewSize=64m -XX:MaxNewSize=64m
  *                   -XX:OldSize=32m -XX:MaxHeapSize=96m -XX:SurvivorRatio=1
- *                   -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:-ExplicitGCInvokesConcurrent -XX:-ResizePLAB
  *                   -XX:+UnlockExperimentalVMOptions
  *                   -XX:SurvivorAlignmentInBytes=128
  *                   TestPromotionFromEdenToTenured 10m 147 TENURED
diff -r 0c3dcc865a1c -r e27de7435453 hotspot/test/gc/survivorAlignment/TestPromotionFromSurvivorToTenuredAfterFullGC.java
--- a/hotspot/test/gc/survivorAlignment/TestPromotionFromSurvivorToTenuredAfterFullGC.java	Fri Jun 19 09:41:50 2015 +0200
+++ b/hotspot/test/gc/survivorAlignment/TestPromotionFromSurvivorToTenuredAfterFullGC.java	Fri Jun 19 11:27:07 2015 +0200
@@ -36,13 +36,13 @@
  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  *                   -XX:+WhiteBoxAPI -XX:NewSize=128m -XX:MaxNewSize=128m
  *                   -XX:OldSize=32m -XX:MaxHeapSize=160m
- *                   -XX:SurvivorRatio=1 -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:SurvivorRatio=1 -XX:-ExplicitGCInvokesConcurrent -XX:-ResizePLAB
  *                   -XX:+UnlockExperimentalVMOptions
  *                   -XX:SurvivorAlignmentInBytes=32
  *                   TestPromotionFromSurvivorToTenuredAfterFullGC 10m 9 TENURED
  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  *                   -XX:+WhiteBoxAPI -XX:NewSize=128m -XX:MaxNewSize=128m
- *                   -XX:OldSize=32m -XX:MaxHeapSize=160m
+ *                   -XX:OldSize=32m -XX:MaxHeapSize=160m -XX:-ResizePLAB
  *                   -XX:SurvivorRatio=1 -XX:-ExplicitGCInvokesConcurrent
  *                   -XX:+UnlockExperimentalVMOptions
  *                   -XX:SurvivorAlignmentInBytes=32
@@ -51,14 +51,14 @@
  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  *                   -XX:+WhiteBoxAPI -XX:NewSize=200m -XX:MaxNewSize=200m
  *                   -XX:OldSize=32m -XX:MaxHeapSize=232m
- *                   -XX:SurvivorRatio=1 -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:SurvivorRatio=1 -XX:-ExplicitGCInvokesConcurrent -XX:-ResizePLAB
  *                   -XX:+UnlockExperimentalVMOptions
  *                   -XX:SurvivorAlignmentInBytes=64
  *                   TestPromotionFromSurvivorToTenuredAfterFullGC 10m 9 TENURED
  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  *                   -XX:+WhiteBoxAPI -XX:NewSize=128m -XX:MaxNewSize=128m
  *                   -XX:OldSize=32m -XX:MaxHeapSize=160m
- *                   -XX:SurvivorRatio=1 -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:SurvivorRatio=1 -XX:-ExplicitGCInvokesConcurrent -XX:-ResizePLAB
  *                   -XX:+UnlockExperimentalVMOptions
  *                   -XX:SurvivorAlignmentInBytes=64
  *                   TestPromotionFromSurvivorToTenuredAfterFullGC 20m 87
@@ -66,7 +66,7 @@
  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  *                   -XX:+WhiteBoxAPI -XX:NewSize=256m -XX:MaxNewSize=256m
  *                   -XX:OldSize=32M -XX:MaxHeapSize=288m
- *                   -XX:SurvivorRatio=1 -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:SurvivorRatio=1 -XX:-ExplicitGCInvokesConcurrent -XX:-ResizePLAB
  *                   -XX:+UnlockExperimentalVMOptions
  *                   -XX:SurvivorAlignmentInBytes=128
  *                    TestPromotionFromSurvivorToTenuredAfterFullGC 10m 9
@@ -74,7 +74,7 @@
  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  *                   -XX:+WhiteBoxAPI -XX:NewSize=128m -XX:MaxNewSize=128m
  *                   -XX:OldSize=32m -XX:MaxHeapSize=160m
- *                   -XX:SurvivorRatio=1 -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:SurvivorRatio=1 -XX:-ExplicitGCInvokesConcurrent -XX:-ResizePLAB
  *                   -XX:+UnlockExperimentalVMOptions
  *                   -XX:SurvivorAlignmentInBytes=128
  *                   TestPromotionFromSurvivorToTenuredAfterFullGC 20m 147
diff -r 0c3dcc865a1c -r e27de7435453 hotspot/test/gc/survivorAlignment/TestPromotionFromSurvivorToTenuredAfterMinorGC.java
--- a/hotspot/test/gc/survivorAlignment/TestPromotionFromSurvivorToTenuredAfterMinorGC.java	Fri Jun 19 09:41:50 2015 +0200
+++ b/hotspot/test/gc/survivorAlignment/TestPromotionFromSurvivorToTenuredAfterMinorGC.java	Fri Jun 19 11:27:07 2015 +0200
@@ -36,7 +36,7 @@
  *                              sun.hotspot.WhiteBox$WhiteBoxPermission
  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  *                   -XX:+WhiteBoxAPI -XX:NewSize=128m -XX:MaxNewSize=128m
- *                   -XX:OldSize=32M -XX:MaxHeapSize=160m -XX:SurvivorRatio=1
+ *                   -XX:OldSize=32M -XX:MaxHeapSize=160m -XX:SurvivorRatio=1 -XX:-ResizePLAB
  *                   -XX:-ExplicitGCInvokesConcurrent
  *                   -XX:+UnlockExperimentalVMOptions
  *                   -XX:SurvivorAlignmentInBytes=32
@@ -44,7 +44,7 @@
  *                   TENURED
  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  *                   -XX:+WhiteBoxAPI -XX:NewSize=128m -XX:MaxNewSize=128m
- *                   -XX:OldSize=32M -XX:MaxHeapSize=160m -XX:SurvivorRatio=1
+ *                   -XX:OldSize=32M -XX:MaxHeapSize=160m -XX:SurvivorRatio=1 -XX:-ResizePLAB
  *                   -XX:-ExplicitGCInvokesConcurrent
  *                   -XX:+UnlockExperimentalVMOptions
  *                   -XX:SurvivorAlignmentInBytes=32
@@ -52,7 +52,7 @@
  *                   TENURED
  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  *                   -XX:+WhiteBoxAPI -XX:NewSize=200m -XX:MaxNewSize=200m
- *                   -XX:OldSize=32M -XX:MaxHeapSize=232m -XX:SurvivorRatio=1
+ *                   -XX:OldSize=32M -XX:MaxHeapSize=232m -XX:SurvivorRatio=1 -XX:-ResizePLAB
  *                   -XX:-ExplicitGCInvokesConcurrent
  *                   -XX:+UnlockExperimentalVMOptions
  *                   -XX:SurvivorAlignmentInBytes=64
@@ -60,7 +60,7 @@
  *                   TENURED
  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  *                   -XX:+WhiteBoxAPI -XX:NewSize=128m -XX:MaxNewSize=128m
- *                   -XX:OldSize=32M -XX:MaxHeapSize=160m -XX:SurvivorRatio=1
+ *                   -XX:OldSize=32M -XX:MaxHeapSize=160m -XX:SurvivorRatio=1 -XX:-ResizePLAB
  *                   -XX:-ExplicitGCInvokesConcurrent
  *                   -XX:+UnlockExperimentalVMOptions
  *                   -XX:SurvivorAlignmentInBytes=64
@@ -68,7 +68,7 @@
  *                   TENURED
  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  *                   -XX:+WhiteBoxAPI -XX:NewSize=256m -XX:MaxNewSize=256m
- *                   -XX:OldSize=32M -XX:MaxHeapSize=288m -XX:SurvivorRatio=1
+ *                   -XX:OldSize=32M -XX:MaxHeapSize=288m -XX:SurvivorRatio=1 -XX:-ResizePLAB
  *                   -XX:-ExplicitGCInvokesConcurrent
  *                   -XX:+UnlockExperimentalVMOptions
  *                   -XX:SurvivorAlignmentInBytes=128
@@ -76,7 +76,7 @@
  *                    TENURED
  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  *                   -XX:+WhiteBoxAPI -XX:NewSize=128m -XX:MaxNewSize=128m
- *                   -XX:OldSize=32M -XX:MaxHeapSize=160m -XX:SurvivorRatio=1
+ *                   -XX:OldSize=32M -XX:MaxHeapSize=160m -XX:SurvivorRatio=1 -XX:-ResizePLAB
  *                   -XX:-ExplicitGCInvokesConcurrent
  *                   -XX:+UnlockExperimentalVMOptions
  *                   -XX:SurvivorAlignmentInBytes=128
diff -r 0c3dcc865a1c -r e27de7435453 hotspot/test/gc/survivorAlignment/TestPromotionToSurvivor.java
--- a/hotspot/test/gc/survivorAlignment/TestPromotionToSurvivor.java	Fri Jun 19 09:41:50 2015 +0200
+++ b/hotspot/test/gc/survivorAlignment/TestPromotionToSurvivor.java	Fri Jun 19 11:27:07 2015 +0200
@@ -37,37 +37,37 @@
  *                   -XX:+WhiteBoxAPI -XX:NewSize=128m -XX:MaxNewSize=128m
  *                   -XX:SurvivorRatio=1 -XX:+UnlockExperimentalVMOptions
  *                   -XX:SurvivorAlignmentInBytes=32 -XX:OldSize=128m
- *                   -XX:MaxHeapSize=256m -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:MaxHeapSize=256m -XX:-ExplicitGCInvokesConcurrent -XX:-ResizePLAB
  *                   TestPromotionToSurvivor 10m 9 SURVIVOR
  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  *                   -XX:+WhiteBoxAPI -XX:NewSize=128m -XX:MaxNewSize=128m
  *                   -XX:SurvivorRatio=1 -XX:+UnlockExperimentalVMOptions
  *                   -XX:SurvivorAlignmentInBytes=32 -XX:OldSize=128m
- *                   -XX:MaxHeapSize=256m -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:MaxHeapSize=256m -XX:-ExplicitGCInvokesConcurrent -XX:-ResizePLAB
  *                   TestPromotionToSurvivor 20m 47 SURVIVOR
  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  *                   -XX:+WhiteBoxAPI -XX:NewSize=128m -XX:MaxNewSize=128m
  *                   -XX:SurvivorRatio=1 -XX:+UnlockExperimentalVMOptions
  *                   -XX:SurvivorAlignmentInBytes=64 -XX:OldSize=128m
- *                   -XX:MaxHeapSize=256m -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:MaxHeapSize=256m -XX:-ExplicitGCInvokesConcurrent -XX:-ResizePLAB
  *                   TestPromotionToSurvivor 8m 9 SURVIVOR
  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  *                   -XX:+WhiteBoxAPI -XX:NewSize=128m -XX:MaxNewSize=128m
  *                   -XX:SurvivorRatio=1 -XX:+UnlockExperimentalVMOptions
  *                   -XX:SurvivorAlignmentInBytes=64 -XX:OldSize=128m
- *                   -XX:MaxHeapSize=256m -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:MaxHeapSize=256m -XX:-ExplicitGCInvokesConcurrent -XX:-ResizePLAB
  *                   TestPromotionToSurvivor 20m 87 SURVIVOR
  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  *                   -XX:+WhiteBoxAPI -XX:NewSize=256m -XX:MaxNewSize=256m
  *                   -XX:SurvivorRatio=1 -XX:+UnlockExperimentalVMOptions
  *                   -XX:SurvivorAlignmentInBytes=128 -XX:OldSize=128m
- *                   -XX:MaxHeapSize=384m  -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:MaxHeapSize=384m  -XX:-ExplicitGCInvokesConcurrent -XX:-ResizePLAB
  *                   TestPromotionToSurvivor 10m 9 SURVIVOR
  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
  *                   -XX:+WhiteBoxAPI -XX:NewSize=128m -XX:MaxNewSize=128m
  *                   -XX:SurvivorRatio=1 -XX:+UnlockExperimentalVMOptions
  *                   -XX:SurvivorAlignmentInBytes=128 -XX:OldSize=128m
- *                   -XX:MaxHeapSize=256m -XX:-ExplicitGCInvokesConcurrent
+ *                   -XX:MaxHeapSize=256m -XX:-ExplicitGCInvokesConcurrent -XX:-ResizePLAB
  *                   TestPromotionToSurvivor 20m 147 SURVIVOR
  */
 public class TestPromotionToSurvivor {