mirror of
https://github.com/RGBCube/serenity
synced 2025-05-31 12:48:10 +00:00
aee9317d86
This significantly reduces the pressure on the kernel heap when allocating a lot of pages. Previously at about 250MB allocated, the free page list would outgrow the kernel's heap. Given that there is no longer a page list, this does not happen. The next barrier will be the kernel memory used by the page records for in-use memory. This kicks in at about 1GB.
39 lines
1.2 KiB
C++
39 lines
1.2 KiB
C++
#pragma once
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#include <AK/Bitmap.h>
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#include <AK/Retainable.h>
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#include <AK/Retained.h>
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#include <Kernel/PhysicalAddress.h>
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#include <Kernel/VM/PhysicalPage.h>
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class PhysicalRegion : public Retainable<PhysicalRegion> {
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AK_MAKE_ETERNAL
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public:
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static Retained<PhysicalRegion> create(PhysicalAddress lower, PhysicalAddress upper);
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~PhysicalRegion() {}
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void expand(PhysicalAddress lower, PhysicalAddress upper);
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unsigned finalize_capacity();
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PhysicalAddress lower() const { return m_lower; }
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PhysicalAddress upper() const { return m_upper; }
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unsigned size() const { return m_pages; }
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unsigned used() const { return m_used; }
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unsigned free() const { return m_pages - m_used; }
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bool contains(PhysicalPage& page) const { return page.paddr() >= m_lower && page.paddr() <= m_upper; }
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RetainPtr<PhysicalPage> take_free_page(bool supervisor);
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void return_page_at(PhysicalAddress addr);
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void return_page(PhysicalPage& page) { return_page_at(page.paddr()); }
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private:
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PhysicalRegion(PhysicalAddress lower, PhysicalAddress upper);
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PhysicalAddress m_lower;
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PhysicalAddress m_upper;
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unsigned m_pages { 0 };
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unsigned m_used { 0 };
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unsigned m_last { 0 };
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Bitmap m_bitmap;
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};
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