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Kernel: Implement lazy committed page allocation

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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.
This commit is contained in:
Tom 2020-09-04 21:12:25 -06:00 • committed by Andreas Kling
parent e21cc4cff6
commit b2a52f6208
20 changed files with 329 additions and 67 deletions
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Kernel/VM/ContiguousVMObject.h
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@ -42,7 +42,7 @@ private:
explicit ContiguousVMObject(const ContiguousVMObject&);
virtual const char* class_name() const override { return "ContiguousVMObject"; }
virtual NonnullRefPtr<VMObject> clone() override;
virtual RefPtr<VMObject> clone() override;
ContiguousVMObject& operator=(const ContiguousVMObject&) = delete;
ContiguousVMObject& operator=(ContiguousVMObject&&) = delete;