Mercurial > hg > truffle

diff src/share/vm/gc_implementation/g1/g1_globals.hpp @ 4912:a9647476d1a4

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
7132029: G1: mixed GC phase lasts for longer than it should Summary: Revamp of the mechanism that chooses old regions for inclusion in the CSet. It simplifies the code and introduces min and max bounds on the number of old regions added to the CSet at each mixed GC to avoid pathological cases. It also ensures that when we do a mixed GC we'll always find old regions to add to the CSet (i.e., it eliminates the case where a mixed GC will collect no old regions which can happen today). Reviewed-by: johnc, brutisso
author tonyp
date Wed, 15 Feb 2012 13:06:53 -0500
parents 1d6185f732aa
children 21595f05bc93
line wrap: on
line diff
--- a/src/share/vm/gc_implementation/g1/g1_globals.hpp	Wed Jan 18 09:50:16 2012 -0800
+++ b/src/share/vm/gc_implementation/g1/g1_globals.hpp	Wed Feb 15 13:06:53 2012 -0500
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -297,7 +297,23 @@
                                                                             \
   develop(uintx, G1DefaultMaxNewGenPercent, 80,                             \
           "Percentage (0-100) of the heap size to use as maximum "          \
-          "young gen size.")
+          "young gen size.")                                                \
+                                                                            \
+  develop(uintx, G1OldCSetRegionLiveThresholdPercent, 95,                   \
+          "Threshold for regions to be added to the collection set. "       \
+          "Regions with more live bytes that this will not be collected.")  \
+                                                                            \
+  develop(uintx, G1OldReclaimableThresholdPercent, 1,                       \
+          "Threshold for the remaining old reclaimable bytes, expressed "   \
+          "as a percentage of the heap size. If the old reclaimable bytes " \
+          "are under this we will not collect them with more mixed GCs.")   \
+                                                                            \
+  develop(uintx, G1MaxMixedGCNum, 4,                                        \
+          "The maximum desired number of mixed GCs after a marking cycle.") \
+                                                                            \
+  develop(uintx, G1OldCSetRegionThresholdPercent, 10,                       \
+          "An upper bound for the number of old CSet regions expressed "    \
+          "as a percentage of the heap size.")
 
 G1_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG, DECLARE_MANAGEABLE_FLAG, DECLARE_PRODUCT_RW_FLAG)