Ryan Macnak
4e6cd29eef
- Initial and final marking no longer visit all of new-space, reducing the STW pause for major GC. - A scavenge during concurrent marking must forward / filter objects in the marking worklist that are moved / collected, increasing the STW pause for minor GC. - Unreachable intergenerational cycles and weak references are collected in the next mark-sweep instead of first requiring enough scavenges to promote the whole cycle or weak target into old-space. - Artificial minor GCs are no longer needed to avoid memory leaks from back-to-back major GCs. - reachabilityBarrier is now just a count of major GCs. TEST=ci Change-Id: I1e653c9b5d3e02e45b280302c832157a75788db6 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/345350 Commit-Queue: Ryan Macnak <rmacnak@google.com> Reviewed-by: Siva Annamalai <asiva@google.com>
46 lines
1.3 KiB
C++
46 lines
1.3 KiB
C++
// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef RUNTIME_VM_HEAP_SWEEPER_H_
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#define RUNTIME_VM_HEAP_SWEEPER_H_
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#include "vm/globals.h"
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namespace dart {
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// Forward declarations.
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class FreeList;
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class Heap;
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class Page;
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class IsolateGroup;
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class PageSpace;
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// The class GCSweeper is used to visit the heap after marking to reclaim unused
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// memory.
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class GCSweeper {
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public:
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GCSweeper() {}
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~GCSweeper() {}
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// Sweep the memory area for the page while clearing the mark bits and adding
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// all the unmarked objects to the freelist. Whether the freelist is
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// pre-locked is indicated by the locked parameter.
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// Returns true if the page is in use. Freelist is untouched if page is not
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// in use.
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bool SweepPage(Page* page, FreeList* freelist);
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// Returns the number of words from page->object_start() to the end of the
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// last marked object.
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intptr_t SweepLargePage(Page* page);
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intptr_t SweepNewPage(Page* page);
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// Sweep the large and regular sized data pages.
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static void SweepConcurrent(IsolateGroup* isolate_group);
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};
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} // namespace dart
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#endif // RUNTIME_VM_HEAP_SWEEPER_H_
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