8220592: ZGC: Move destruction of detached ZPages into ZPageAllocator
Reviewed-by: stefank, eosterlund
/*
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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#include "precompiled.hpp"
#include "gc/z/zPage.inline.hpp"
#include "gc/z/zPhysicalMemory.inline.hpp"
#include "gc/z/zPreMappedMemory.inline.hpp"
#include "gc/z/zVirtualMemory.inline.hpp"
#include "logging/log.hpp"
ZPreMappedMemory::ZPreMappedMemory(ZVirtualMemoryManager &vmm, ZPhysicalMemoryManager &pmm, size_t size) :
_vmem(),
_pmem(),
_initialized(false) {
if (!vmm.is_initialized() || !pmm.is_initialized()) {
// Not initialized
return;
}
// Pre-mapping and pre-touching memory can take a long time. Log a message
// to help the user understand why the JVM might seem slow to start.
log_info(gc, init)("Pre-touching: %s", AlwaysPreTouch ? "Enabled" : "Disabled");
log_info(gc, init)("Pre-mapping: " SIZE_FORMAT "M", size / M);
if (size > 0) {
_pmem = pmm.alloc(size);
if (_pmem.is_null()) {
// Out of memory
log_error(gc, init)("Failed to pre-map Java heap (Cannot allocate physical memory)");
return;
}
_vmem = vmm.alloc(size, true /* alloc_from_front */);
if (_vmem.is_null()) {
// Out of address space
log_error(gc, init)("Failed to pre-map Java heap (Cannot allocate virtual memory)");
pmm.free(_pmem);
return;
}
// Map physical memory
pmm.map(_pmem, _vmem.start());
}
_initialized = true;
}
ZPage* ZPreMappedMemory::alloc_page(uint8_t type, size_t size) {
if (size > available()) {
// Not enough pre-mapped memory
return NULL;
}
// Take a chunk of the pre-mapped memory
const ZPhysicalMemory pmem = _pmem.split(size);
const ZVirtualMemory vmem = _vmem.split(size);
ZPage* const page = new ZPage(type, vmem, pmem);
page->set_pre_mapped();
return page;
}
void ZPreMappedMemory::clear() {
assert(_pmem.is_null(), "Should be detached");
_vmem.clear();
}