Re: [PATCHv3 1/2] proc: mm: export PTE sizes directly in smaps

On 10/26/2017 07:19 AM, Michal Hocko wrote:

quoted

Current vm_normal_page implementation doesn't pick up page with DEVMAP pfn.
The second patch fix this and export DAX mappings into counters introduced in the
first patch.

IMO, the user care more about how much persistent memory they used, how about
a small tweak with smaps_account, and report the total mapping size into RSS/PSS,
which user are usually more familiar with?

No! Rss and pss is already used by many tools to evaluate misbehaving
tasks. If you start accounting the memory which is not bound to the
process life time then you can break those usecases. This is the reason
why hugetlb is not accounted to rss as well.

Yeah, folks (rightly) assume Rss is memory and eaten from MemTotal.  DAX
mappings do not use RAM.