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7151089: PS NUMA: NUMA allocator should not attempt to free pages when using SHM large pages

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Don't attempt to uncommit SHM-based large pages

Reviewed-by: kvn
This commit is contained in:
Igor Veresov 2012-03-12 13:12:07 -07:00
parent db0efee3d4
commit 12b4b456cb
1 changed files with 8 additions and 1 deletions
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7
hotspot/src/os/linux/vm/os_linux.cpp
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@ -2547,7 +2547,14 @@ void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
}
void os::free_memory(char *addr, size_t bytes, size_t alignment_hint) {
// This method works by doing an mmap over an existing mmaping and effectively discarding
// the existing pages. However it won't work for SHM-based large pages that cannot be
// uncommitted at all. We don't do anything in this case to avoid creating a segment with
// small pages on top of the SHM segment. This method always works for small pages, so we
// allow that in any case.
if (alignment_hint <= (size_t)os::vm_page_size() || !UseSHM) {
commit_memory(addr, bytes, alignment_hint, false);
}
}
void os::numa_make_global(char *addr, size_t bytes) {