[PATCH v5 2/7] mm: Optimize mprotect() for MM_CP_PROT_NUMA by batch-skipping PTEs

[Zi Yan]

On 18 Jul 2025, at 5:02, Dev Jain wrote:

> For the MM_CP_PROT_NUMA skipping case, observe that, if we skip an
> iteration due to the underlying folio satisfying any of the skip
> conditions, then for all subsequent ptes which map the same folio, the
> iteration will be skipped for them too. Therefore, we can optimize
> by using folio_pte_batch() to batch skip the iterations.
>
> Use prot_numa_skip() introduced in the previous patch to determine whether
> we need to skip the iteration. Change its signature to have a double
> pointer to a folio, which will be used by mprotect_folio_pte_batch() to
> determine the number of iterations we can safely skip.
>
> Signed-off-by: Dev Jain <dev.jain at arm.com>
> ---
>  mm/mprotect.c | 55 +++++++++++++++++++++++++++++++++++++++------------
>  1 file changed, 42 insertions(+), 13 deletions(-)
>
LGTM. Reviewed-by: Zi Yan <ziy at nvidia.com>

Best Regards,
Yan, Zi