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8245707: Increase Metaspace reserve alignment

Reviewed-by: iklam, coleenp
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Thomas Stuefe
Thomas Stuefe committed Jun 2, 2020
1 parent 334df28 commit 5ce3d0d8e57c90f51090a052390765d76c844d6f
Showing with 7 additions and 0 deletions.
  1. +7 −0 src/hotspot/share/memory/metaspace.cpp
@@ -1077,6 +1077,13 @@ void Metaspace::ergo_initialize() {
_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

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