Re: [RFC PATCH v5 00/10] mm: Hot page tracking and promotion infrastructure

[Gregory Price]

On Tue, Feb 24, 2026 at 05:25:13PM +0530, Bharata B Rao wrote:
> >> Time in seconds - Lower is better
> >> Mop/s total - Higher is better
> >> =====================================================================================
> >>                         Base            Base            pghot-default
> >> pghot-precise
> >>                         NUMAB0          NUMAB2          NUMAB2          NUMAB2
> >> =====================================================================================
> >> Time in seconds         7349.86         4422.50         6219.71         4113.56
> >> Mop/s total             53247.66        88493.630       62923.030       95139.810
> >>
> >> pgpromote_success       0               42181834        248503390       41955718
> >> pgpromote_candidate     0               0               577086192       0
> >> pgpromote_candidate_nrl 0               42181834        29410329        41956171
> >> pgdemote_kswapd         0               0               216489010       0
> >> numa_pte_updates        0               42252749        607470975       42037882
> >> numa_hint_faults        0               42183772        606540729       41968150
> >> =====================================================================================
> 
> For pghot-default, with target_nid alternating between the available
> toptier nodes 0 and 1, the numbers catch up with pghot-precise and base
> NUMAB2 case as seen below:
> ================================
> Time in seconds         4337.98
> Mop/s total             90217.86
> 
> pgpromote_success       42170085
> pgpromote_candidate     0
> pgpromote_candidate_nrl 42171963
> pgdemote_kswapd         0
> numa_pte_updates        42338538
> numa_hint_faults        42185662
> ================================
> 

Fascinating! Thank you for the quick follow up.

I wonder if this was a lucky run, it almost seems *too* perfect.

~Gregory