On 02.09.25 10:13, Wei Yang wrote:
On Tue, Sep 02, 2025 at 09:49:48AM +0200, David Hildenbrand wrote:
- /*
* To challenge spitting code, we will mremap page[x] of the* thp[x] into a smaller area, and trigger the split from that* smaller area. This will end up replacing the PMD mappings in* the thp_area by PTE mappings first, leaving the THPs unsplit.*/This confuse me a little. How about move "and trigger the split from that smaller area" to the end? So that I know mremap convert to pte-mapping and leave thp unsplit. Then we do the split.
After spleeping over it, what about the following?
+ /* + * To challenge spitting code, we will mremap a single page of each + * THP (page[i] of thp[i]) in the thp_area into page_area. This will + * replace the PMD mappings in the thp_area by PTE mappings first, + * but leaving the THP unsplit, to then create a page-sized hole in + * the thp_area. + * We will then manually trigger splitting of all THPs through the + * single mremap'ed pages of each THP in the page_area. + */