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Unified Diff: src/spaces.h

Issue 11066118: Implement committed physical memory stats for Linux. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Created 8 years, 2 months ago
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Index: src/spaces.h
diff --git a/src/spaces.h b/src/spaces.h
index 2062f5fea5788131ca68585271c27424395ec71c..001bedb93d1cdf8018f9a4f3416e9922f8c22e87 100644
--- a/src/spaces.h
+++ b/src/spaces.h
@@ -489,7 +489,7 @@ class MemoryChunk {
static const size_t kSlotsBufferOffset = kLiveBytesOffset + kIntSize;
static const size_t kHeaderSize =
- kSlotsBufferOffset + kPointerSize + kPointerSize;
+ kSlotsBufferOffset + kPointerSize + kPointerSize + kPointerSize;
static const int kBodyOffset =
CODE_POINTER_ALIGN(MAP_POINTER_ALIGN(kHeaderSize + Bitmap::kSize));
@@ -601,6 +601,13 @@ class MemoryChunk {
return static_cast<int>(area_end() - area_start());
}
+ // Approximate amount of physical memory committed for this chunk.
+ size_t CommittedPhysicalMemory() {
+ return high_water_mark_;
+ }
+
+ static inline void UpdateHighWaterMark(Address mark);
+
protected:
MemoryChunk* next_chunk_;
MemoryChunk* prev_chunk_;
@@ -625,6 +632,9 @@ class MemoryChunk {
int live_byte_count_;
SlotsBuffer* slots_buffer_;
SkipList* skip_list_;
+ // Assuming the initial allocation on a page is sequential,
+ // count highest number of bytes ever allocated on the page.
+ int high_water_mark_;
static MemoryChunk* Initialize(Heap* heap,
Address base,
@@ -1474,6 +1484,9 @@ class PagedSpace : public Space {
// spaces this equals the capacity.
intptr_t CommittedMemory() { return Capacity(); }
+ // Approximate amount of physical memory committed for this space.
+ size_t CommittedPhysicalMemory();
+
// Sets the capacity, the available space and the wasted space to zero.
// The stats are rebuilt during sweeping by adding each page to the
// capacity and the size when it is encountered. As free spaces are
@@ -1534,6 +1547,7 @@ class PagedSpace : public Space {
void SetTop(Address top, Address limit) {
ASSERT(top == limit ||
Page::FromAddress(top) == Page::FromAddress(limit - 1));
+ MemoryChunk::UpdateHighWaterMark(allocation_info_.top);
allocation_info_.top = top;
allocation_info_.limit = limit;
}
@@ -1940,6 +1954,9 @@ class SemiSpace : public Space {
static void Swap(SemiSpace* from, SemiSpace* to);
+ // Approximate amount of physical memory committed for this space.
+ size_t CommittedPhysicalMemory();
+
private:
// Flips the semispace between being from-space and to-space.
// Copies the flags into the masked positions on all pages in the space.
@@ -2137,6 +2154,9 @@ class NewSpace : public Space {
return Capacity();
}
+ // Approximate amount of physical memory committed for this space.
+ size_t CommittedPhysicalMemory();
+
// Return the available bytes without growing.
intptr_t Available() {
return Capacity() - Size();
@@ -2504,6 +2524,9 @@ class LargeObjectSpace : public Space {
return Size();
}
+ // Approximate amount of physical memory committed for this space.
+ size_t CommittedPhysicalMemory();
+
int PageCount() {
return page_count_;
}
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