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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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@ -47,7 +47,7 @@ class VMObject : public RefCounted<VMObject>
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public:
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virtual ~VMObject();
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virtual NonnullRefPtr<VMObject> clone() = 0;
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virtual RefPtr<VMObject> clone() = 0;
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virtual bool is_anonymous() const { return false; }
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virtual bool is_purgeable() const { return false; }
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