Re: [PATCH v5 04/13] mm/shmem: Restrict MFD_INACCESSIBLE memory against RLIMIT_MEMLOCK

[Chao Peng <chao.p.peng@xxxxxxxxxxxxxxx>]

On Mon, Apr 11, 2022 at 06:32:33PM +0300, Kirill A. Shutemov wrote:
> On Thu, Apr 07, 2022 at 04:05:36PM +0000, Sean Christopherson wrote:
> > Hmm, shmem_writepage() already handles SHM_F_INACCESSIBLE by rejecting the swap, so
> > maybe it's just the page migration path that needs to be updated?
> 
> My early version prevented migration with -ENOTSUPP for
> address_space_operations::migratepage().
> 
> What's wrong with that approach?

I previously thought migratepage will not be called since we already
marked the pages as UNMOVABLE, sounds not correct?

Thanks,
Chao
> 
> -- 
>  Kirill A. Shutemov