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8159056: [aix] Compressed class space not allocated in lower regions

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Reviewed-by: dholmes, enevill
This commit is contained in:
Goetz Lindenmaier 2016-06-08 16:07:49 +02:00
parent 84cab6c56f
commit 59e5844219
1 changed files with 15 additions and 8 deletions

23
hotspot/src/share/vm/memory/metaspace.cpp

@ -2933,7 +2933,7 @@ void Metaspace::allocate_metaspace_compressed_klass_ptrs(char* requested_addr, a
// Don't use large pages for the class space.
bool large_pages = false;
#ifndef AARCH64
#if !(defined(AARCH64) || defined(AIX))
ReservedSpace metaspace_rs = ReservedSpace(compressed_class_space_size(),
_reserve_alignment,
large_pages,
@ -2945,18 +2945,25 @@ void Metaspace::allocate_metaspace_compressed_klass_ptrs(char* requested_addr, a
// bits.
if ((uint64_t)requested_addr + compressed_class_space_size() < 4*G) {
metaspace_rs = ReservedSpace(compressed_class_space_size(),
_reserve_alignment,
large_pages,
requested_addr);
_reserve_alignment,
large_pages,
requested_addr);
}
if (! metaspace_rs.is_reserved()) {
// Try to align metaspace so that we can decode a compressed klass
// with a single MOVK instruction. We can do this iff the
// Aarch64: Try to align metaspace so that we can decode a compressed
// klass with a single MOVK instruction. We can do this iff the
// compressed class base is a multiple of 4G.
for (char *a = (char*)align_ptr_up(requested_addr, 4*G);
// Aix: Search for a place where we can find memory. If we need to load
// the base, 4G alignment is helpful, too.
size_t increment = AARCH64_ONLY(4*)G;
for (char *a = (char*)align_ptr_up(requested_addr, increment);
a < (char*)(1024*G);
a += 4*G) {
a += increment) {
if (a == (char *)(32*G)) {
// Go faster from here on. Zero-based is no longer possible.
increment = 4*G;
}
#if INCLUDE_CDS
if (UseSharedSpaces