Re: [PATCHv3 03/17] mm/ksm: Do not merge pages with different KeyIDs

From: Dave Hansen
Date: Wed Jun 13 2018 - 16:40:53 EST

On 06/13/2018 01:35 PM, Dave Hansen wrote:
> On 06/13/2018 01:31 PM, Kirill A. Shutemov wrote:
>>> What actually happens without this patch in place?
>> One of processes would get the page mapped with wrong KeyID and see
>> garbage.
> OK, but what about two pages with the same KeyID? It's actually totally
> possible for KSM to determine that two pages have the same plaintext and
> merge them. Why don't we do that?

/me goes back to look at the patch... which is doing exactly that

But, this still needs a stronger explanation of what goes wrong if this
patch is not in place.