Oilpan: Remove a redundant loop from NormalPageHeap::allocatePage()

Source/platform/heap/HeapPage.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 503 matching lines @@
     for (size_t i = 0; i < blinkPageSizeLog2; ++i)
         json.pushInteger(bucketStats[i].freeSize);
     json.endArray();
 }
 #endif
 
 void NormalPageHeap::allocatePage()
 {
     threadState()->shouldFlushHeapDoesNotContainCache();
     PageMemory* pageMemory = Heap::freePagePool()->takeFreePage(heapIndex());
-    // We continue allocating page memory until we succeed in committing one.
-    size_t numberOfTrials = 0;
-    while (!pageMemory) {
+
+    if (!pageMemory) {
         // Allocate a memory region for blinkPagesPerRegion pages that
         // will each have the following layout.
         //
         //    [ guard os page | ... payload ... | guard os page ]
         //    ^---{ aligned to blink page size }
         PageMemoryRegion* region = PageMemoryRegion::allocateNormalPages();
 
         // Setup the PageMemory object for each of the pages in the region.
         for (size_t i = 0; i < blinkPagesPerRegion; ++i) {
             PageMemory* memory = PageMemory::setupPageMemoryInRegion(region, i * blinkPageSize, blinkPagePayloadSize());
             // Take the first possible page ensuring that this thread actually
             // gets a page and add the rest to the page pool.
             if (!pageMemory) {
-                if (memory->commit())
-                    pageMemory = memory;
-                else
-                    delete memory;
+                bool result = memory->commit();
+                // If you hit the ASSERT, it will mean that you're hitting
+                // the limit of the number of mmapped regions OS can support
+                // (e.g., /proc/sys/vm/max_map_count in Linux).
+                RELEASE_ASSERT(result);
+                pageMemory = memory;
             } else {
                 Heap::freePagePool()->addFreePage(heapIndex(), memory);
             }
         }
-        ++numberOfTrials;
-        // If you hit the ASSERT, it means that you're hitting the limit of
-        // the number of mmapped regions OS can support
-        // (e.g., /proc/sys/vm/max_map_count in Linux).
-        RELEASE_ASSERT(numberOfTrials < 64);
     }
+
     NormalPage* page = new (pageMemory->writableStart()) NormalPage(pageMemory, this);
     page->link(&m_firstPage);
 
     Heap::increaseAllocatedSpace(page->size());
 #if ENABLE(ASSERT) || defined(LEAK_SANITIZER) || defined(ADDRESS_SANITIZER)
     // Allow the following addToFreeList() to add the newly allocated memory
     // to the free list.
     ASAN_UNPOISON_MEMORY_REGION(page->payload(), page->payloadSize());
     Address address = page->payload();
     for (size_t i = 0; i < page->payloadSize(); i++)
@@ skipping 1258 matching lines @@
 
     m_hasEntries = true;
     size_t index = hash(address);
     ASSERT(!(index & 1));
     Address cachePage = roundToBlinkPageStart(address);
     m_entries[index + 1] = m_entries[index];
     m_entries[index] = cachePage;
 }
 
 } // namespace blink