Messages in this thread | | | Subject | Re: [RFC PATCH v3] sparc64: Add support for Application Data Integrity (ADI) | From | Dave Hansen <> | Date | Wed, 4 Jan 2017 16:14:53 -0800 |
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On 01/04/2017 04:05 PM, Rob Gardner wrote: >> What if two different small pages have different tags and khugepaged >> comes along and tries to collapse them? Will the page be split if a >> user attempts to set two different tags inside two different small-page >> portions of a single THP? > > The MCD tags operate at a resolution of cache lines (64 bytes). Page > sizes don't matter except that each virtual page must have a bit set in > its TTE to allow MCD to be enabled on the page. Any page can have many > different tags, one for each cache line.
Is an "MCD tag" the same thing as a "ADI version tag"?
The thing that confused me here is that we're taking an entire page of "ADI version tags" and stuffing them into a swap pte (in set_swp_pte_at()). Do we somehow have enough space in a swap pte on sparc to fit PAGE_SIZE/64 "ADI version tag"s in there?
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