Re: [RFC 2/2] page_fault: add hugepage_delay option for delayed MADV_HUGEPAGE

Vincent Fu <[email protected]> Fri, 30 Jan 2026 15:08:35 -0500

Newsgroups	org.kernel.vger.fio
Message-ID	<CAOp=CXkRbfsuzHYrB0qVnZPNx3OQgVUE48iZTzjDFtBB0x-Uyg@mail.gmail.com>

On Thu, Jan 29, 2026 at 1:43 PM Nico Pache <[email protected]> wrote:
>
> Introduce hugepage_delay to map with MADV_NOHUGEPAGE first, then
> madvise MADV_HUGEPAGE after a configurable delay via a helper thread.
> This makes khugepaged candidates reproducible for page_fault tests.
>
> Signed-off-by: Nico Pache <[email protected]>
> ---

I would add this option as an *ioengine* option instead of a general
FIo option. There are examples in sync.c, io_uring.c, etc.

This option also needs to be added to the documentation.

Vincent