[heap] Switch to 500k pages

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/snapshot/snapshot.h"
 
 #include "src/api.h"
 #include "src/base/platform/platform.h"
@@ skipping 13 matching lines @@
 
 bool Snapshot::HasContextSnapshot(Isolate* isolate, size_t index) {
   // Do not use snapshots if the isolate is used to create snapshots.
   const v8::StartupData* blob = isolate->snapshot_blob();
   if (blob == nullptr) return false;
   if (blob->data == nullptr) return false;
   size_t num_contexts = static_cast<size_t>(ExtractNumContexts(blob));
   return index < num_contexts;
 }
 
-
-uint32_t Snapshot::SizeOfFirstPage(Isolate* isolate, AllocationSpace space) {
+uint32_t Snapshot::SizeOfSnapshot(Isolate* isolate, AllocationSpace space) {
   DCHECK(space >= FIRST_PAGED_SPACE && space <= LAST_PAGED_SPACE);
   if (!isolate->snapshot_available()) {
-    return static_cast<uint32_t>(MemoryAllocator::PageAreaSize(space));
+    return 0;
   }
   uint32_t size;
   int offset = kFirstPageSizesOffset + (space - FIRST_PAGED_SPACE) * kInt32Size;
   memcpy(&size, isolate->snapshot_blob()->data + offset, kInt32Size);
   return size;
 }
 
 
 bool Snapshot::Initialize(Isolate* isolate) {
   if (!isolate->snapshot_available()) return false;
@@ skipping 90 matching lines @@
   }
 
   for (int space = 0; space < i::Serializer::kNumberOfSpaces; space++) {
     // If the space requirement for a page is less than a page size, we consider
     // limiting the size of the first page in order to save memory on startup.
     uint32_t required = startup_requirements[space] +
                         2 * context_requirements[space] +
                         Page::kObjectStartOffset;
     // Add a small allowance to the code space for small scripts.
     if (space == CODE_SPACE) required += 32 * KB;
+    // And some allowance for regular objects.
+    if (space == OLD_SPACE) required += 4 * KB;
 
     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] = std::min(required, max_size);
+      sizes_out[space - FIRST_PAGED_SPACE] = required;
     }
   }
 }
 
 v8::StartupData Snapshot::CreateSnapshotBlob(
     const SnapshotData* startup_snapshot,
     const List<SnapshotData*>* context_snapshots) {
   int num_contexts = context_snapshots->length();
   int startup_snapshot_offset = StartupSnapshotOffset(num_contexts);
   int total_length = startup_snapshot_offset;
@@ skipping 120 matching lines @@
 Vector<const byte> SnapshotData::Payload() const {
   int reservations_size = GetHeaderValue(kNumReservationsOffset) * kInt32Size;
   const byte* payload = data_ + kHeaderSize + reservations_size;
   int length = GetHeaderValue(kPayloadLengthOffset);
   DCHECK_EQ(data_ + size_, payload + length);
   return Vector<const byte>(payload, length);
 }
 
 }  // namespace internal
 }  // namespace v8