Re: [PATCH] docs: update THP documentation to clarify sysfs "never" setting

[Zi Yan <ziy@nvidia.com>]

On 21 Jul 2025, at 11:55, Lorenzo Stoakes wrote:

> Rather confusingly, setting all Transparent Huge Page sysfs settings to
> "never" does not in fact result in THP being globally disabled.
>
> Rather, it results in khugepaged being disabled, but one can still obtain
> THP pages using madvise(..., MADV_COLLAPSE).
>
> This is something that has remained poorly documented for some time, and it
> is likely the received wisdom of most users of THP that never does, in
> fact, mean never.
>
> It is therefore important to highlight, very clearly, that this is not the
> ase.
>
> Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
> ---
>  Documentation/admin-guide/mm/transhuge.rst | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
>

LGTM. Reviewed-by: Zi Yan <ziy@nvidia.com>


Best Regards,
Yan, Zi