# HG changeset patch
# User stuefe
# Date 1590558926 -7200
#      Wed May 27 07:55:26 2020 +0200
# Node ID e8a52daf510e76fc2dc943bdeae6080bc092cc7a
# Parent  ce51df3ee4223b2f6f6d180283de7e4e276a8cdc
[mq]: 8245707-Increase-Metaspace-reserve-alignment

diff -r ce51df3ee422 -r e8a52daf510e src/hotspot/share/memory/metaspace.cpp
--- a/src/hotspot/share/memory/metaspace.cpp	Wed May 27 03:21:15 2020 +0000
+++ b/src/hotspot/share/memory/metaspace.cpp	Wed May 27 07:55:26 2020 +0200
@@ -1077,6 +1077,13 @@
   _commit_alignment  = page_size;
   _reserve_alignment = MAX2(page_size, (size_t)os::vm_allocation_granularity());
 
+  // The upcoming Metaspace rewrite will impose a higher alignment granularity.
+  // To prepare for that and to catch/prevent any misuse of Metaspace alignment
+  // which may creep in, up the alignment a bit.
+  if (_reserve_alignment == 4 * K) {
+    _reserve_alignment *= 4;
+  }
+
   // Do not use FLAG_SET_ERGO to update MaxMetaspaceSize, since this will
   // override if MaxMetaspaceSize was set on the command line or not.
   // This information is needed later to conform to the specification of the