Reduce allowance in the first code page at start up.

src/snapshot/snapshot-common.cc

 // Copyright 2006-2008 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.
 
 // The common functionality when building with or without snapshots.
 
 #include "src/v8.h"
 
 #include "src/api.h"
 #include "src/base/platform/platform.h"
@@ skipping 119 matching lines @@
     uint32_t required = kMaxUInt32;
     if (single_chunk) {
       // If both the startup snapshot data and the context snapshot data on
       // this space fit in a single page, then we consider limiting the size
       // of the first page. For this, we add the chunk sizes and some extra
       // allowance. This way we achieve a smaller startup memory footprint.
       required = (startup_reservations[startup_index].chunk_size() +
                   2 * context_reservations[context_index].chunk_size()) +
                  Page::kObjectStartOffset;
       // Add a small allowance to the code space for small scripts.
-      if (space == CODE_SPACE) required += 64 * KB;
+      if (space == CODE_SPACE) required += 32 * KB;
     } else {
       // We expect the vanilla snapshot to only require on page per space.
       DCHECK(!is_default_snapshot);
     }
 
     if (space >= FIRST_PAGED_SPACE && space <= LAST_PAGED_SPACE) {
       uint32_t max_size =
           MemoryAllocator::PageAreaSize(static_cast<AllocationSpace>(space));
       sizes_out[space - FIRST_PAGED_SPACE] = Min(required, max_size);
     } else {
@@ skipping 71 matching lines @@
   memcpy(&startup_length, data->data + kStartupLengthOffset, kIntSize);
   int context_offset = ContextOffset(startup_length);
   const byte* context_data =
       reinterpret_cast<const byte*>(data->data + context_offset);
   DCHECK_LT(context_offset, data->raw_size);
   int context_length = data->raw_size - context_offset;
   return Vector<const byte>(context_data, context_length);
 }
 }  // namespace internal
 }  // namespace v8