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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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@ -48,12 +48,12 @@ private:
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};
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public:
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SharedBuffer(int id, int size)
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SharedBuffer(int id, NonnullRefPtr<PurgeableVMObject>&& vmobject)
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: m_shbuf_id(id)
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, m_vmobject(PurgeableVMObject::create_with_size(size))
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, m_vmobject(move(vmobject))
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{
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#ifdef SHARED_BUFFER_DEBUG
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dbg() << "Created shared buffer " << m_shbuf_id << " of size " << size;
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dbg() << "Created shared buffer " << m_shbuf_id << " of size " << m_vmobject->size();
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#endif
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}
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