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Kernel: Implement lazy committed page allocation
By designating a committed page pool we can guarantee to have physical pages available for lazy allocation in mappings. However, when forking we will overcommit. The assumption is that worst-case it's better for the fork to die due to insufficient physical memory on COW access than the parent that created the region. If a fork wants to ensure that all memory is available (trigger a commit) then it can use madvise. This also means that fork now can gracefully fail if we don't have enough physical pages available.
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20 changed files with 329 additions and 67 deletions
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@ -105,7 +105,7 @@ public:
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PageFaultResponse handle_fault(const PageFault&);
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NonnullOwnPtr<Region> clone();
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OwnPtr<Region> clone();
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bool contains(VirtualAddress vaddr) const
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{
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@ -194,7 +194,7 @@ public:
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void set_inherit_mode(InheritMode inherit_mode) { m_inherit_mode = inherit_mode; }
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bool remap_page_range(size_t page_index, size_t page_count, bool do_commit);
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bool remap_page_range(size_t page_index, size_t page_count);
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bool is_volatile(VirtualAddress vaddr, size_t size) const;
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enum class SetVolatileError {
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