Re: [PATCH 2/2] mm: Consolidate page table accounting

[Kirill A. Shutemov]

On Thu, Oct 05, 2017 at 10:38:29AM +0530, Anshuman Khandual wrote:
> On 10/04/2017 10:06 PM, Kirill A. Shutemov wrote:
> > This patch switches page table accounting to single counter from
> > three -- nr_ptes, nr_pmds and nr_puds.
> > 
> > mm->pgtables_bytes is now used to account page table levels. We use
> > bytes, because page table size for different levels of page table tree
> > may be different.
> > 
> > The change has user-visible effect: we don't have VmPMD and VmPUD
> > reported in /proc/[pid]/status. Not sure if anybody uses them.
> > (As alternative, we can always report 0 kB for them.)
> > 
> > OOM-killer report is also slightly changed: we now report pgtables_bytes
> > instead of nr_ptes, nr_pmd, nr_puds.
> 
> Could you please mention the motivation of doing this ? Why we are
> consolidating the counters which also changes /proc/ interface as
> well as OOM report ? What is the benefit ?

Sure, I'll update description.

-- 
 Kirill A. Shutemov