Re: [PATCHv15 09/17] mm: Expose untagging mask in /proc/$PID/status

[Alexander Potapenko]

On Mon, Jan 23, 2023 at 11:05 PM Kirill A. Shutemov
<kirill.shutemov@xxxxxxxxxxxxxxx> wrote:
>
> Add a line in /proc/$PID/status to report untag_mask. It can be
> used to find out LAM status of the process from the outside. It is
> useful for debuggers.
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
> Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx>
> Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>


>         mm->context.untag_mask = -1UL;
> diff --git a/fs/proc/array.c b/fs/proc/array.c
> index 49283b8103c7..d2a94eafe9a3 100644
> --- a/fs/proc/array.c
> +++ b/fs/proc/array.c

Right now mm_untag_mask() is visible from array.c thanks to inclusion
of <linux/cpuset.h>, which happens to include <linux/mmu_context.h>.
But maybe it would be better to directly include mmu_context.h here?