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diff src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 1991:016a3628c885

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6994056: G1: when GC locker is active, extend the Eden instead of allocating into the old gen Summary: Allow the eden to the expanded up to a point when the GC locker is active. Reviewed-by: jwilhelm, johnc, ysr, jcoomes
author tonyp
date Tue, 07 Dec 2010 16:47:42 -0500
parents 631f79e71e90
children 0fa27f37d4d4
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line diff
--- a/src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp	Thu Dec 02 13:20:39 2010 -0500
+++ b/src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp	Tue Dec 07 16:47:42 2010 -0500
@@ -479,6 +479,7 @@
   // region before we need to do a collection again.
   size_t min_length = _g1->young_list()->length() + 1;
   _young_list_target_length = MAX2(_young_list_target_length, min_length);
+  calculate_max_gc_locker_expansion();
   calculate_survivors_policy();
 }
 
@@ -2301,6 +2302,21 @@
   };
 }
 
+void G1CollectorPolicy::calculate_max_gc_locker_expansion() {
+  size_t expansion_region_num = 0;
+  if (GCLockerEdenExpansionPercent > 0) {
+    double perc = (double) GCLockerEdenExpansionPercent / 100.0;
+    double expansion_region_num_d = perc * (double) _young_list_target_length;
+    // We use ceiling so that if expansion_region_num_d is > 0.0 (but
+    // less than 1.0) we'll get 1.
+    expansion_region_num = (size_t) ceil(expansion_region_num_d);
+  } else {
+    assert(expansion_region_num == 0, "sanity");
+  }
+  _young_list_max_length = _young_list_target_length + expansion_region_num;
+  assert(_young_list_target_length <= _young_list_max_length, "post-condition");
+}
+
 // Calculates survivor space parameters.
 void G1CollectorPolicy::calculate_survivors_policy()
 {