Messages in this thread | | | Date | Tue, 30 Sep 2014 22:32:33 -0400 | From | Daniel Micay <> | Subject | Re: [PATCH v3] mm: add mremap flag for preserving the old mapping |
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On 30/09/14 01:49 PM, Andy Lutomirski wrote: > > I think it might pay to add an explicit vm_op to authorize > duplication, especially for non-cow mappings. IOW this kind of > extension seems quite magical for anything that doesn't have the > normal COW semantics, including for plain old read-only mappings.
This sounds like the best way forwards.
Setting up the op for private, anonymous mappings and having it check vm_flags & VM_WRITE dynamically seems like it would be enough for the intended use case in general purpose allocators. It can be extended to other mapping types later if there's a compelling use case.
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