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8003705: CDS failed on Windows: can not map in the CDS

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Map memory only once to prevent 'already mapped' failures.

Reviewed-by: acorn, zgu
This commit is contained in:
Harold Seigel 2013-01-07 15:32:51 -05:00
parent 64499d9494
commit 89e575df23
2 changed files with 20 additions and 4 deletions
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12
hotspot/src/share/vm/memory/filemap.cpp
View file

@ -211,7 +211,11 @@ void FileMapInfo::open_for_write() {
// Remove the existing file in case another process has it open.
remove(_full_path);
#ifdef _WINDOWS // if 0444 is used on Windows, then remove() will fail.
int fd = open(_full_path, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0744);
#else
int fd = open(_full_path, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0444);
#endif
if (fd < 0) {
fail_stop("Unable to create shared archive file %s.", _full_path);
}
@ -370,9 +374,8 @@ ReservedSpace FileMapInfo::reserve_shared_memory() {
return rs;
}
// the reserved virtual memory is for mapping class data sharing archive
if (MemTracker::is_on()) {
MemTracker::record_virtual_memory_type((address)rs.base(), mtClassShared);
}
return rs;
}
@ -394,6 +397,11 @@ char* FileMapInfo::map_region(int i) {
fail_continue(err_msg("Unable to map %s shared space at required address.", shared_region_name[i]));
return NULL;
}
#ifdef _WINDOWS
// This call is Windows-only because the memory_type gets recorded for the other platforms
// in method FileMapInfo::reserve_shared_memory(), which is not called on Windows.
MemTracker::record_virtual_memory_type((address)base, mtClassShared);
#endif
return base;
}

10
hotspot/src/share/vm/memory/metaspaceShared.cpp
View file

@ -689,9 +689,15 @@ void MetaspaceShared::print_shared_spaces() {
bool MetaspaceShared::map_shared_spaces(FileMapInfo* mapinfo) {
size_t image_alignment = mapinfo->alignment();
// Map in the shared memory and then map the regions on top of it
#ifndef _WINDOWS
// Map in the shared memory and then map the regions on top of it.
// On Windows, don't map the memory here because it will cause the
// mappings of the regions to fail.
ReservedSpace shared_rs = mapinfo->reserve_shared_memory();
if (!shared_rs.is_reserved()) return false;
#endif
assert(!DumpSharedSpaces, "Should not be called with DumpSharedSpaces");
// Map each shared region
if ((_ro_base = mapinfo->map_region(ro)) != NULL &&
@ -708,8 +714,10 @@ bool MetaspaceShared::map_shared_spaces(FileMapInfo* mapinfo) {
if (_rw_base != NULL) mapinfo->unmap_region(rw);
if (_md_base != NULL) mapinfo->unmap_region(md);
if (_mc_base != NULL) mapinfo->unmap_region(mc);
#ifndef _WINDOWS
// Release the entire mapped region
shared_rs.release();
#endif
// If -Xshare:on is specified, print out the error message and exit VM,
// otherwise, set UseSharedSpaces to false and continue.
if (RequireSharedSpaces) {