src/hotspot/share/memory/metaspace.cpp

rev 50191 : [mq]: 8203262-capacity-until-gc2

*** 2415,2444 ****
  }
  
  bool MetaspaceGC::inc_capacity_until_GC(size_t v, size_t* new_cap_until_GC, size_t* old_cap_until_GC) {
    assert_is_aligned(v, Metaspace::commit_alignment());
  
!   size_t capacity_until_GC = _capacity_until_GC;
!   size_t new_value = capacity_until_GC + v;
  
!   if (new_value < capacity_until_GC) {
      // The addition wrapped around, set new_value to aligned max value.
      new_value = align_down(max_uintx, Metaspace::commit_alignment());
    }
  
!   size_t expected = _capacity_until_GC;
!   size_t actual = Atomic::cmpxchg(new_value, &_capacity_until_GC, expected);
  
!   if (expected != actual) {
      return false;
    }
  
    if (new_cap_until_GC != NULL) {
      *new_cap_until_GC = new_value;
    }
    if (old_cap_until_GC != NULL) {
!     *old_cap_until_GC = capacity_until_GC;
    }
    return true;
  }
  
  size_t MetaspaceGC::dec_capacity_until_GC(size_t v) {
--- 2415,2443 ----
  }
  
  bool MetaspaceGC::inc_capacity_until_GC(size_t v, size_t* new_cap_until_GC, size_t* old_cap_until_GC) {
    assert_is_aligned(v, Metaspace::commit_alignment());
  
!   size_t old_value = _capacity_until_GC;
!   size_t new_value = old_value + v;
  
!   if (new_value < old_value) {
      // The addition wrapped around, set new_value to aligned max value.
      new_value = align_down(max_uintx, Metaspace::commit_alignment());
    }
  
!   size_t res = Atomic::cmpxchg(new_value, &_capacity_until_GC, old_value);
  
!   if (old_value != res) {
      return false;
    }
  
    if (new_cap_until_GC != NULL) {
      *new_cap_until_GC = new_value;
    }
    if (old_cap_until_GC != NULL) {
!     *old_cap_until_GC = old_value;
    }
    return true;
  }
  
  size_t MetaspaceGC::dec_capacity_until_GC(size_t v) {