8386323: Remove unused MemoryPool allocation availability state

Reviewed-by: stefank, tschatzl, jsikstro

src/hotspot/share/gc/parallel/psMemoryPool.cpp

@@ -32,7 +32,7 @@ PSOldGenerationPool::PSOldGenerationPool(PSOldGen* old_gen,
 }
 
 MemoryUsage PSOldGenerationPool::get_memory_usage() {
-  size_t maxSize   = (available_for_allocation() ? max_size() : 0);
+  size_t maxSize   = max_size();
   size_t used      = used_in_bytes();
   size_t committed = _old_gen->capacity_in_bytes();
 
@@ -59,7 +59,7 @@ PSEdenSpacePool::PSEdenSpacePool(PSYoungGen* young_gen,
 }
 
 MemoryUsage PSEdenSpacePool::get_memory_usage() {
-  size_t maxSize   = (available_for_allocation() ? max_size() : 0);
+  size_t maxSize   = max_size();
   size_t used = used_in_bytes();
   size_t committed = _space->capacity_in_bytes();
 
@@ -80,7 +80,7 @@ PSSurvivorSpacePool::PSSurvivorSpacePool(PSYoungGen* young_gen,
 }
 
 MemoryUsage PSSurvivorSpacePool::get_memory_usage() {
-  size_t maxSize = (available_for_allocation() ? max_size() : 0);
+  size_t maxSize = max_size();
   size_t used    = used_in_bytes();
   size_t committed = committed_in_bytes();
   return MemoryUsage(initial_size(), used, committed, maxSize);

src/hotspot/share/gc/serial/serialMemoryPools.cpp

@@ -40,7 +40,7 @@ size_t ContiguousSpacePool::used_in_bytes() {
 }
 
 MemoryUsage ContiguousSpacePool::get_memory_usage() {
-  size_t maxSize   = (available_for_allocation() ? max_size() : 0);
+  size_t maxSize   = max_size();
   size_t used      = used_in_bytes();
   size_t committed = _space->capacity();
 
@@ -64,7 +64,7 @@ size_t SurvivorContiguousSpacePool::committed_in_bytes() {
 }
 
 MemoryUsage SurvivorContiguousSpacePool::get_memory_usage() {
-  size_t maxSize = (available_for_allocation() ? max_size() : 0);
+  size_t maxSize = max_size();
   size_t used    = used_in_bytes();
   size_t committed = committed_in_bytes();
 
@@ -85,7 +85,7 @@ size_t TenuredGenerationPool::used_in_bytes() {
 MemoryUsage TenuredGenerationPool::get_memory_usage() {
   size_t used      = used_in_bytes();
   size_t committed = _gen->capacity();
-  size_t maxSize   = (available_for_allocation() ? max_size() : 0);
+  size_t maxSize   = max_size();
 
   return MemoryUsage(initial_size(), used, committed, maxSize);
 }

src/hotspot/share/services/memoryPool.cpp

@@ -51,7 +51,6 @@ MemoryPool::MemoryPool(const char* name,
   _type(type),
   _initial_size(init_size),
   _max_size(max_size),
-  _available_for_allocation(true),
   _managers(),
   _num_managers(0),
   _peak_usage(),
@@ -188,7 +187,7 @@ MemoryUsage CodeHeapPool::get_memory_usage() {
   size_t used      = used_in_bytes();
   OrderAccess::acquire(); // ensure possible cache expansion in CodeCache::allocate is seen
   size_t committed = _codeHeap->capacity();
-  size_t maxSize   = (available_for_allocation() ? max_size() : 0);
+  size_t maxSize   = max_size();
 
   return MemoryUsage(initial_size(), used, committed, maxSize);
 }

src/hotspot/share/services/memoryPool.hpp

@@ -61,7 +61,6 @@ class MemoryPool : public CHeapObj<mtInternal> {
   PoolType         _type;
   size_t           _initial_size;
   size_t           _max_size;
-  bool             _available_for_allocation; // Default is true
   MemoryManager*   _managers[max_num_managers];
   int              _num_managers;
   MemoryUsage      _peak_usage;               // Peak memory usage
@@ -98,13 +97,6 @@ class MemoryPool : public CHeapObj<mtInternal> {
 
   bool is_pool(instanceHandle pool) const;
 
-  bool available_for_allocation()   { return _available_for_allocation; }
-  bool set_available_for_allocation(bool value) {
-    bool prev = _available_for_allocation;
-    _available_for_allocation = value;
-    return prev;
-  }
-
   MemoryManager* get_memory_manager(int index) {
     assert(index >= 0 && index < _num_managers, "Invalid index");
     return _managers[index];