Re: [PATCH v3] mm: add mremap flag for preserving the old mapping
From: Daniel Micay
Date: Tue Sep 30 2014 - 22:32:41 EST
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.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/