zAddressSpaceLimit.cpp

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#include "precompiled.hpp"
#include "gc/shared/gc_globals.hpp"
#include "gc/z/zAddressSpaceLimit.hpp"
#include "gc/z/zGlobals.hpp"
#include "runtime/globals.hpp"
#include "runtime/os.hpp"
#include "utilities/align.hpp"

static size_t address_space_limit() {
  size_t limit = 0;

  if (os::has_allocatable_memory_limit(&limit)) {
    return limit;
  }

  // No limit
  return SIZE_MAX;
}

size_t ZAddressSpaceLimit::mark_stack() {
  // Allow mark stacks to occupy 10% of the address space
  const size_t limit = address_space_limit() / 10;
  return align_up(limit, ZMarkStackSpaceExpandSize);
}

size_t ZAddressSpaceLimit::heap_view() {
  // Allow all heap views to occupy 50% of the address space
  const size_t limit = address_space_limit() / MaxVirtMemFraction / ZHeapViews;
  return align_up(limit, ZGranuleSize);
}