Re: [rfc 1/2] mm/hmm: Allow smaps to see zone device public pages

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On Sat 21-10-17 08:52:27, Balbir Singh wrote:
> On Sat, Oct 21, 2017 at 12:11 AM, Michal Hocko <mhocko@xxxxxxxx> wrote:
> > On Wed 18-10-17 17:31:22, Balbir Singh wrote:
> >> vm_normal_page() normally does not return zone device public
> >> pages. In the absence of the visibility the output from smaps
> >> is limited and confusing. It's hard to figure out where the
> >> pages are. This patch uses _vm_normal_page() to expose them
> >> for accounting
> >
> > Maybe I am missing something but does this patch make any sense without
> > patch 2? If no why they are not folded into a single one?
> 
> 
> I can fold them into one patch. The first patch when applied will just provide
> visibility and they'll show as regular resident pages. The second patch
> then accounts only for them being device memory.

Hmm, I am not really sure. It makes some sense to account mapped HMM
pages as RSS but then I am wondering how HMM differs from other special
mappings (like VM_PFNMAP or VM_MIXEDMAP)?
-- 
Michal Hocko
SUSE Labs

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