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? -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
