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Kernel: Return an already destructed PhysicalPage to the allocators

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By making sure the PhysicalPage instance is fully destructed the
allocators will have a chance to reclaim the PhysicalPageEntry for
free-list purposes. Just pass them the physical address of the page
that was freed, which is enough to lookup the PhysicalPageEntry later.
This commit is contained in:
Tom 2021-07-07 20:28:51 -06:00 • committed by Andreas Kling
parent 87dc4c3d2c
commit c1006a3689
6 changed files with 32 additions and 28 deletions
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4
Kernel/VM/PhysicalRegion.h
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@ -29,13 +29,13 @@ public:
unsigned size() const { return m_pages; }
unsigned used() const { return m_used - m_recently_returned.size(); }
unsigned free() const { return m_pages - m_used + m_recently_returned.size(); }
bool contains(const PhysicalPage& page) const { return page.paddr() >= m_lower && page.paddr() <= m_upper; }
bool contains(PhysicalAddress paddr) const { return paddr >= m_lower && paddr <= m_upper; }
NonnullRefPtr<PhysicalRegion> take_pages_from_beginning(unsigned);
RefPtr<PhysicalPage> take_free_page(bool supervisor);
NonnullRefPtrVector<PhysicalPage> take_contiguous_free_pages(size_t count, bool supervisor, size_t physical_alignment = PAGE_SIZE);
void return_page(const PhysicalPage& page);
void return_page(PhysicalAddress);
private:
unsigned find_contiguous_free_pages(size_t count, size_t physical_alignment = PAGE_SIZE);