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8223446: Shenandoah breaks alignment with some HumongousThreshold values
authorshade
Tue, 07 May 2019 21:53:38 +0200
changeset 54748 b0e23da4c8e0
parent 54747 0082ede5dc53
child 54749 98558b7544c7
8223446: Shenandoah breaks alignment with some HumongousThreshold values Reviewed-by: rkennke
src/hotspot/share/gc/shenandoah/shenandoahHeapRegion.cpp file | annotate | diff | comparison | revisions
src/hotspot/share/gc/shenandoah/shenandoahHeapRegion.inline.hpp file | annotate | diff | comparison | revisions
test/hotspot/jtreg/gc/shenandoah/TestHumongousThreshold.java file | annotate | diff | comparison | revisions 
--- a/src/hotspot/share/gc/shenandoah/shenandoahHeapRegion.cpp	Tue May 07 12:32:19 2019 -0700
+++ b/src/hotspot/share/gc/shenandoah/shenandoahHeapRegion.cpp	Tue May 07 21:53:38 2019 +0200
@@ -619,6 +619,7 @@
 
   guarantee(HumongousThresholdWords == 0, "we should only set it once");
   HumongousThresholdWords = RegionSizeWords * ShenandoahHumongousThreshold / 100;
+  HumongousThresholdWords = align_down(HumongousThresholdWords, MinObjAlignment);
   assert (HumongousThresholdWords <= RegionSizeWords, "sanity");
 
   guarantee(HumongousThresholdBytes == 0, "we should only set it once");
@@ -643,13 +644,14 @@
   //
   // The whole thing is mitigated if Elastic TLABs are enabled.
   //
+  guarantee(MaxTLABSizeWords == 0, "we should only set it once");
+  MaxTLABSizeWords = MIN2(ShenandoahElasticTLAB ? RegionSizeWords : (RegionSizeWords / 8), HumongousThresholdWords);
+  MaxTLABSizeWords = align_down(MaxTLABSizeWords, MinObjAlignment);
+
   guarantee(MaxTLABSizeBytes == 0, "we should only set it once");
-  MaxTLABSizeBytes = MIN2(ShenandoahElasticTLAB ? RegionSizeBytes : (RegionSizeBytes / 8), HumongousThresholdBytes);
+  MaxTLABSizeBytes = MaxTLABSizeWords * HeapWordSize;
   assert (MaxTLABSizeBytes > MinTLABSize, "should be larger");
 
-  guarantee(MaxTLABSizeWords == 0, "we should only set it once");
-  MaxTLABSizeWords = MaxTLABSizeBytes / HeapWordSize;
-
   log_info(gc, init)("Regions: " SIZE_FORMAT " x " SIZE_FORMAT "%s",
                      RegionCount, byte_size_in_proper_unit(RegionSizeBytes), proper_unit_for_byte_size(RegionSizeBytes));
   log_info(gc, init)("Humongous object threshold: " SIZE_FORMAT "%s",
--- a/src/hotspot/share/gc/shenandoah/shenandoahHeapRegion.inline.hpp	Tue May 07 12:32:19 2019 -0700
+++ b/src/hotspot/share/gc/shenandoah/shenandoahHeapRegion.inline.hpp	Tue May 07 21:53:38 2019 +0200
@@ -32,6 +32,8 @@
 HeapWord* ShenandoahHeapRegion::allocate(size_t size, ShenandoahAllocRequest::Type type) {
   _heap->assert_heaplock_or_safepoint();
 
+  assert(is_object_aligned(size), "alloc size breaks alignment: " SIZE_FORMAT, size);
+
   HeapWord* obj = top();
   if (pointer_delta(end(), obj) >= size) {
     make_regular_allocation();
@@ -39,7 +41,9 @@
 
     HeapWord* new_top = obj + size;
     set_top(new_top);
-    assert(is_aligned(obj) && is_aligned(new_top), "checking alignment");
+
+    assert(is_object_aligned(new_top), "new top breaks alignment: " PTR_FORMAT, p2i(new_top));
+    assert(is_object_aligned(obj),     "obj is not aligned: "       PTR_FORMAT, p2i(obj));
 
     return obj;
   } else {
--- a/test/hotspot/jtreg/gc/shenandoah/TestHumongousThreshold.java	Tue May 07 12:32:19 2019 -0700
+++ b/test/hotspot/jtreg/gc/shenandoah/TestHumongousThreshold.java	Tue May 07 21:53:38 2019 +0200
@@ -26,13 +26,76 @@
  * @key gc
  * @requires vm.gc.Shenandoah
  *
- * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g                                      -XX:+ShenandoahVerify TestHumongousThreshold
- * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -XX:ShenandoahHumongousThreshold=50  -XX:+ShenandoahVerify TestHumongousThreshold
- * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -XX:ShenandoahHumongousThreshold=90  -XX:+ShenandoahVerify TestHumongousThreshold
- * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -XX:ShenandoahHumongousThreshold=99  -XX:+ShenandoahVerify TestHumongousThreshold
- * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -XX:ShenandoahHumongousThreshold=100 -XX:+ShenandoahVerify TestHumongousThreshold
+ * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g
+ *                   -XX:+ShenandoahVerify
+ *                   TestHumongousThreshold
+ * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g
+ *                   -XX:+ShenandoahVerify -XX:ShenandoahHumongousThreshold=50
+ *                   TestHumongousThreshold
+ * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g
+ *                   -XX:+ShenandoahVerify -XX:ShenandoahHumongousThreshold=90
+ *                   TestHumongousThreshold
+ * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g
+ *                   -XX:+ShenandoahVerify -XX:ShenandoahHumongousThreshold=99
+ *                   TestHumongousThreshold
+ * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g
+ *                   -XX:+ShenandoahVerify -XX:ShenandoahHumongousThreshold=100
+ *                   TestHumongousThreshold
+ *
+ * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g
+ *                   -XX:-UseTLAB -XX:+ShenandoahVerify
+ *                   TestHumongousThreshold
+ * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g
+ *                   -XX:-UseTLAB -XX:+ShenandoahVerify -XX:ShenandoahHumongousThreshold=50
+ *                   TestHumongousThreshold
+ * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g
+ *                   -XX:-UseTLAB -XX:+ShenandoahVerify -XX:ShenandoahHumongousThreshold=90
+ *                   TestHumongousThreshold
+ * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g
+ *                   -XX:-UseTLAB -XX:+ShenandoahVerify -XX:ShenandoahHumongousThreshold=99
+ *                   TestHumongousThreshold
+ * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g
+ *                   -XX:-UseTLAB -XX:+ShenandoahVerify -XX:ShenandoahHumongousThreshold=100
+ *                   TestHumongousThreshold
  *
- * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -XX:ShenandoahHumongousThreshold=90  -XX:ShenandoahGCHeuristics=aggressive TestHumongousThreshold
+ * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g
+ *                   -XX:ObjectAlignmentInBytes=16 -XX:+ShenandoahVerify
+ *                   TestHumongousThreshold
+ * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g
+ *                   -XX:ObjectAlignmentInBytes=16 -XX:+ShenandoahVerify -XX:ShenandoahHumongousThreshold=50
+ *                   TestHumongousThreshold
+ * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g
+ *                   -XX:ObjectAlignmentInBytes=16 -XX:+ShenandoahVerify -XX:ShenandoahHumongousThreshold=90
+ *                   TestHumongousThreshold
+ * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g
+ *                   -XX:ObjectAlignmentInBytes=16 -XX:+ShenandoahVerify -XX:ShenandoahHumongousThreshold=99
+ *                   TestHumongousThreshold
+ * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g
+ *                   -XX:ObjectAlignmentInBytes=16 -XX:+ShenandoahVerify -XX:ShenandoahHumongousThreshold=100
+ *                   TestHumongousThreshold
+ *
+ * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g
+ *                   -XX:-UseTLAB -XX:ObjectAlignmentInBytes=16 -XX:+ShenandoahVerify
+ *                   TestHumongousThreshold
+ * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g
+ *                   -XX:-UseTLAB -XX:ObjectAlignmentInBytes=16 -XX:+ShenandoahVerify -XX:ShenandoahHumongousThreshold=50
+ *                   TestHumongousThreshold
+ * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g
+ *                   -XX:-UseTLAB -XX:ObjectAlignmentInBytes=16 -XX:+ShenandoahVerify -XX:ShenandoahHumongousThreshold=90
+ *                   TestHumongousThreshold
+ * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g
+ *                   -XX:-UseTLAB -XX:ObjectAlignmentInBytes=16 -XX:+ShenandoahVerify -XX:ShenandoahHumongousThreshold=99
+ *                   TestHumongousThreshold
+ * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g
+ *                   -XX:-UseTLAB -XX:ObjectAlignmentInBytes=16 -XX:+ShenandoahVerify -XX:ShenandoahHumongousThreshold=100
+ *                   TestHumongousThreshold
+ *
+ * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g
+ *                   -XX:ShenandoahHumongousThreshold=90 -XX:ShenandoahGCHeuristics=aggressive
+ *                   TestHumongousThreshold
+ * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g
+ *                   -XX:-UseTLAB -XX:ShenandoahHumongousThreshold=90 -XX:ShenandoahGCHeuristics=aggressive
+ *                   TestHumongousThreshold
  */
 
 import java.util.Random;
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