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Kernel: Merge PurgeableVMObject into AnonymousVMObject

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This implements memory commitments and lazy-allocation of committed
memory.
This commit is contained in:
Tom 2020-09-05 15:52:14 -06:00 • committed by Andreas Kling
parent b2a52f6208
commit 476f17b3f1
35 changed files with 937 additions and 564 deletions
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18
Kernel/VM/Region.h
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@ -32,7 +32,8 @@
#include <AK/Weakable.h>
#include <Kernel/Arch/i386/CPU.h>
#include <Kernel/Heap/SlabAllocator.h>
#include <Kernel/VM/PurgeableVMObject.h>
#include <Kernel/VM/PageFaultResponse.h>
#include <Kernel/VM/PurgeablePageRanges.h>
#include <Kernel/VM/RangeAllocator.h>
#include <Kernel/VM/VMObject.h>
@ -41,12 +42,6 @@ namespace Kernel {
class Inode;
class VMObject;
enum class PageFaultResponse {
ShouldCrash,
OutOfMemory,
Continue,
};
class Region final
: public InlineLinkedListNode<Region>
, public Weakable<Region>
@ -159,9 +154,6 @@ public:
return m_offset_in_vmobject;
}
bool can_commit() const;
bool commit();
size_t amount_resident() const;
size_t amount_shared() const;
size_t amount_dirty() const;
@ -169,7 +161,7 @@ public:
bool should_cow(size_t page_index) const;
void set_should_cow(size_t page_index, bool);
u32 cow_pages() const;
size_t cow_pages() const;
void set_readable(bool b) { set_access_bit(Access::Read, b); }
void set_writable(bool b) { set_access_bit(Access::Write, b); }
@ -207,8 +199,6 @@ public:
RefPtr<Process> get_owner();
private:
Bitmap& ensure_cow_map() const;
void set_access_bit(Access access, bool b)
{
if (b)
@ -217,7 +207,6 @@ private:
m_access &= ~access;
}
bool commit(size_t page_index);
bool remap_page(size_t index, bool with_flush = true);
PageFaultResponse handle_cow_fault(size_t page_index);
@ -242,7 +231,6 @@ private:
bool m_stack : 1 { false };
bool m_mmap : 1 { false };
bool m_kernel : 1 { false };
mutable OwnPtr<Bitmap> m_cow_map;
WeakPtr<Process> m_owner;
};