Mercurial > hg > jdk9-shenandoah > hotspot

changeset 9439:399bc16a1b86

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Treat GC cycle after full GC and VM start specially in heuristics.
author rkennke
date Thu, 30 Jul 2015 15:51:44 +0200
parents fa747dd25e5b
children 4f82f2345042
files src/share/vm/gc_implementation/shenandoah/shenandoahCollectorPolicy.cpp src/share/vm/gc_implementation/shenandoah/shenandoahMarkCompact.cpp src/share/vm/runtime/globals.hpp
diffstat 3 files changed, 11 insertions(+), 3 deletions(-) [+]
line wrap: on
line diff
--- a/src/share/vm/gc_implementation/shenandoah/shenandoahCollectorPolicy.cpp	Thu Jul 30 15:51:43 2015 +0200
+++ b/src/share/vm/gc_implementation/shenandoah/shenandoahCollectorPolicy.cpp	Thu Jul 30 15:51:44 2015 +0200
@@ -257,8 +257,8 @@
 
     ShenandoahHeap* heap = ShenandoahHeap::heap();
     size_t available = heap->free_regions()->available();
-    double factor = heap->need_update_refs() ? _free_threshold_factor : 0.4;
-    size_t targetStartMarking = capacity * factor;
+    uintx factor = heap->need_update_refs() ? ShenandoahFreeThreshold : ShenandoahInitialFreeThreshold;
+    size_t targetStartMarking = (capacity * factor) / 100;
 
     size_t threshold_bytes_allocated = heap->capacity() * _allocation_threshold_factor;
     if (available < targetStartMarking &&
--- a/src/share/vm/gc_implementation/shenandoah/shenandoahMarkCompact.cpp	Thu Jul 30 15:51:43 2015 +0200
+++ b/src/share/vm/gc_implementation/shenandoah/shenandoahMarkCompact.cpp	Thu Jul 30 15:51:44 2015 +0200
@@ -145,6 +145,8 @@
 
   oopDesc::set_bs(_old_barrier_set); 
 
+  _heap->set_need_update_refs(false);
+
   _heap->shenandoahPolicy()->record_phase_end(ShenandoahCollectorPolicy::full_gc);
 }
  
--- a/src/share/vm/runtime/globals.hpp	Thu Jul 30 15:51:43 2015 +0200
+++ b/src/share/vm/runtime/globals.hpp	Thu Jul 30 15:51:44 2015 +0200
@@ -1629,7 +1629,13 @@
           "it can be marked for collection. Applies to "                    \
           "Shenandoah GC dynamic Heuristic mode only (ignored otherwise)")  \
                                                                             \
-  product(uintx, ShenandoahFreeThreshold, 10,                               \
+  product(uintx, ShenandoahFreeThreshold, 25,                               \
+          "Set the percentage of heap free in relation to the total "       \
+          "capacity before a region can enter the concurrent marking "      \
+          "phase. Applies to Shenandoah GC dynamic Heuristic mode only "    \
+          "(ignored otherwise)")                                            \
+                                                                            \
+  product(uintx, ShenandoahInitialFreeThreshold, 50,                        \
           "Set the percentage of heap free in relation to the total "       \
           "capacity before a region can enter the concurrent marking "      \
           "phase. Applies to Shenandoah GC dynamic Heuristic mode only "    \