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hotspot/src/share/vm/memory/threadLocalAllocBuffer.inline.hpp

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+/*
+ * Copyright 1999-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+inline HeapWord* ThreadLocalAllocBuffer::allocate(size_t size) {
+  invariants();
+  HeapWord* obj = top();
+  if (pointer_delta(end(), obj) >= size) {
+    // successful thread-local allocation
+
+    DEBUG_ONLY(Copy::fill_to_words(obj, size, badHeapWordVal));
+    // This addition is safe because we know that top is
+    // at least size below end, so the add can't wrap.
+    set_top(obj + size);
+
+    invariants();
+    return obj;
+  }
+  return NULL;
+}
+
+inline size_t ThreadLocalAllocBuffer::compute_size(size_t obj_size) {
+  const size_t aligned_obj_size = align_object_size(obj_size);
+
+  // Compute the size for the new TLAB.
+  // The "last" tlab may be smaller to reduce fragmentation.
+  // unsafe_max_tlab_alloc is just a hint.
+  const size_t available_size = Universe::heap()->unsafe_max_tlab_alloc(myThread()) /
+                                                  HeapWordSize;
+  size_t new_tlab_size = MIN2(available_size, desired_size() + aligned_obj_size);
+
+  // Make sure there's enough room for object and filler int[].
+  const size_t obj_plus_filler_size = aligned_obj_size + alignment_reserve();
+  if (new_tlab_size < obj_plus_filler_size) {
+    // If there isn't enough room for the allocation, return failure.
+    if (PrintTLAB && Verbose) {
+      gclog_or_tty->print_cr("ThreadLocalAllocBuffer::compute_size(" SIZE_FORMAT ")"
+                    " returns failure",
+                    obj_size);
+    }
+    return 0;
+  }
+  if (PrintTLAB && Verbose) {
+    gclog_or_tty->print_cr("ThreadLocalAllocBuffer::compute_size(" SIZE_FORMAT ")"
+                  " returns " SIZE_FORMAT,
+                  obj_size, new_tlab_size);
+  }
+  return new_tlab_size;
+}
+
+
+void ThreadLocalAllocBuffer::record_slow_allocation(size_t obj_size) {
+  // Raise size required to bypass TLAB next time. Why? Else there's
+  // a risk that a thread that repeatedly allocates objects of one
+  // size will get stuck on this slow path.
+
+  set_refill_waste_limit(refill_waste_limit() + refill_waste_limit_increment());
+
+  _slow_allocations++;
+
+  if (PrintTLAB && Verbose) {
+    Thread* thrd = myThread();
+    gclog_or_tty->print("TLAB: %s thread: "INTPTR_FORMAT" [id: %2d]"
+                        " obj: "SIZE_FORMAT
+                        " free: "SIZE_FORMAT
+                        " waste: "SIZE_FORMAT"\n",
+                        "slow", thrd, thrd->osthread()->thread_id(),
+                        obj_size, free(), refill_waste_limit());
+  }
+}