[heap] Switch to 500k pages

src/globals.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_GLOBALS_H_
 #define V8_GLOBALS_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 183 matching lines @@
 #endif
 
 // Trigger an incremental GCs once the external memory reaches this limit.
 const int kExternalAllocationSoftLimit = 64 * MB;
 
 // Maximum object size that gets allocated into regular pages. Objects larger
 // than that size are allocated in large object space and are never moved in
 // memory. This also applies to new space allocation, since objects are never
 // migrated from new space to large object space. Takes double alignment into
 // account.
-const int kMaxRegularHeapObjectSize = 512 * KB - 512;
+//
+// Current value: Page::kAllocatableMemory (on 32-bit arch) - 512 (slack).
+const int kMaxRegularHeapObjectSize = 507136;
 
 STATIC_ASSERT(kPointerSize == (1 << kPointerSizeLog2));
 
 const int kBitsPerByte = 8;
 const int kBitsPerByteLog2 = 3;
 const int kBitsPerPointer = kPointerSize * kBitsPerByte;
 const int kBitsPerInt = kIntSize * kBitsPerByte;
 
 // IEEE 754 single precision floating point number bit layout.
 const uint32_t kBinary32SignMask = 0x80000000u;
@@ skipping 956 matching lines @@
   LIVE_EDIT_FRAME_DROPPED_IN_RETURN_CALL,
   LIVE_EDIT_CURRENTLY_SET_MODE
 };
 
 }  // namespace internal
 }  // namespace v8
 
 namespace i = v8::internal;
 
 #endif  // V8_GLOBALS_H_