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Kernel: Avoid allocations in the VMObject constructor

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This avoids allocations in the VMObject constructor. The number of
inline elements was determined empirically and covers most common cases
including LibC malloc.
This commit is contained in:
Gunnar Beutner 2021-06-02 21:26:09 +02:00 committed by Linus Groh
parent 596361791c
commit 6f38ce8f47
Notes: sideshowbarker 2024-07-18 16:59:39 +09:00 
Author: https://github.com/gunnarbeutner
Commit: https://github.com/SerenityOS/serenity/commit/6f38ce8f47f
Pull-request: https://github.com/SerenityOS/serenity/pull/7703
1 changed files with 3 additions and 3 deletions
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6
Kernel/VM/VMObject.h
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@ -42,8 +42,8 @@ public:
virtual bool is_contiguous() const { return false; }
size_t page_count() const { return m_physical_pages.size(); }
const Vector<RefPtr<PhysicalPage>>& physical_pages() const { return m_physical_pages; }
Vector<RefPtr<PhysicalPage>>& physical_pages() { return m_physical_pages; }
const Vector<RefPtr<PhysicalPage>, 16>& physical_pages() const { return m_physical_pages; }
Vector<RefPtr<PhysicalPage>, 16>& physical_pages() { return m_physical_pages; }
size_t size() const { return m_physical_pages.size() * PAGE_SIZE; }
@ -71,7 +71,7 @@ protected:
void for_each_region(Callback);
IntrusiveListNode<VMObject> m_list_node;
Vector<RefPtr<PhysicalPage>> m_physical_pages;
Vector<RefPtr<PhysicalPage>, 16> m_physical_pages;
Lock m_paging_lock { "VMObject" };
mutable SpinLock<u8> m_lock;