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Kernel: Make AnonymousVMObject COW-Bitmap allocation OOM-fallible

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This commit is contained in:
Idan Horowitz 2022-02-10 19:17:27 +02:00
parent 871a53db76
commit 8030e2a88f
5 changed files with 35 additions and 21 deletions
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8
Kernel/Memory/AnonymousVMObject.h
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@ -29,7 +29,7 @@ public:
PageFaultResponse handle_cow_fault(size_t, VirtualAddress);
size_t cow_pages() const;
bool should_cow(size_t page_index, bool) const;
void set_should_cow(size_t page_index, bool);
ErrorOr<void> set_should_cow(size_t page_index, bool);
bool is_purgeable() const { return m_purgeable; }
bool is_volatile() const { return m_volatile; }
@ -41,6 +41,8 @@ public:
private:
class SharedCommittedCowPages;
static ErrorOr<NonnullRefPtr<AnonymousVMObject>> try_create_with_shared_cow(AnonymousVMObject const&, NonnullRefPtr<SharedCommittedCowPages>, FixedArray<RefPtr<PhysicalPage>>&&);
explicit AnonymousVMObject(FixedArray<RefPtr<PhysicalPage>>&&, AllocationStrategy, Optional<CommittedPhysicalPageSet>);
explicit AnonymousVMObject(PhysicalAddress, FixedArray<RefPtr<PhysicalPage>>&&);
explicit AnonymousVMObject(FixedArray<RefPtr<PhysicalPage>>&&);
@ -54,8 +56,8 @@ private:
virtual bool is_anonymous() const override { return true; }
Bitmap& ensure_cow_map();
void ensure_or_reset_cow_map();
ErrorOr<void> ensure_cow_map();
ErrorOr<void> ensure_or_reset_cow_map();
Optional<CommittedPhysicalPageSet> m_unused_committed_pages;
Bitmap m_cow_map;