On Tue, 8 Sep 2026 13:50:46 +0100 Kiryl Shutsemau <[email protected]> wrote:
> khugepaged collapses to mTHP orders since 7.2, and 7.3 added three
> selftest cases for it: the generic collapse cases run at one order named
> by -c, with the result detected by counting folios of that order.
>
> That leaves the collapse path largely untested. The suite does not run
> where a PMD is 512M. A folio count cannot say where a collapse landed.
> Fixed sleeps cannot tell "not collapsed" from "not scanned yet". And
> nothing exercises collapse under contention.
>
> Close those gaps in order:
Added to mm-new, thanks.
Sashiko asked a few things:
https://sashiko.dev/#/patchset/[email protected]
