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+0530, Dev Jain wrote: > > > > > > commit: > > > > >    94dab12d86 ("mm: call pointers to ptes as ptep") > > > > >    f822a9a81a ("mm: optimize mremap() by PTE batching") > > > > > > > > > > 94dab12d86cf77ff f822a9a81a31311d67f260aea96 > > > > > ---------------- --------------------------- > > > > >           %stddev     %change         %stddev > > > > >               \          |                \ > > > > >       13777 ± 37%     +45.0%      19979 ± 27% > > > > > numa-vmstat.node1.nr_slab_reclaimable > > > > >      367205            +2.3%     375703 vmstat.system.in > > > > >       55106 ± 37%     +45.1%      79971 ± 27% > > > > > numa-meminfo.node1.KReclaimable > > > > >       55106 ± 37%     +45.1%      79971 ± 27% > > > > > numa-meminfo.node1.SReclaimable > > > > >      559381           -37.3%     350757 > > > > > stress-ng.bigheap.realloc_calls_per_sec > > > > >       11468            +1.2%      11603 stress-ng.time.system_time > > > > >      296.25            +4.5%     309.70 stress-ng.time.user_time > > > > >        0.81 ±187%    -100.0%       0.00 perf-sched.sch_delay.avg.ms.__cond_resched.zap_pte_range.zap_pmd_range.isra.0 > > > > >        9.36 ±165%    -100.0%       0.00 perf-sched.sch_delay.max.ms.__cond_resched.zap_pte_range.zap_pmd_range.isra.0 > > > > >        0.81 ±187%    -100.0%       0.00 perf-sched.wait_time.avg.ms.__cond_resched.zap_pte_range.zap_pmd_range.isra.0 > > > > >        9.36 ±165%    -100.0%       0.00 perf-sched.wait_time.max.ms.__cond_resched.zap_pte_range.zap_pmd_range.isra.0 > > Hm is lack of zap some kind of clue here? > > > > > >        5.50 ± 17%    +390.9%      27.00 ± 56% perf-c2c.DRAM.local > > > > >      388.50 ± 10%    +114.7%     834.17 ± 33% perf-c2c.DRAM.remote > > > > >        1214 ± 13%    +107.3%       2517 ± 31% perf-c2c.HITM.local > > > > >      135.00 ± 19%    +130.9%     311.67 ± 32% perf-c2c.HITM.remote > > > > >        1349 ± 13%    +109.6%       2829 ± 31% perf-c2c.HITM.total > > > > > > > > Yeah this also looks pretty consistent too... > > > > > > It almost looks like some kind of NUMA effects? > > > > > > I would have expected that it's the overhead of the vm_normal_folio(), > > > but not sure how that corresponds to the SLAB + local vs. remote stats. > > > Maybe they are just noise? > > Is there any way of making the robot test again? As you said, the only > > suspect is vm_normal_folio(), nothing seems to pop up... > > > > Not sure there's much point in that, these tests are run repeatedly and > statistical analysis taken from them so what would another run accomplish unless > there's something very consistently wrong with the box that happens only to > trigger at your commit? > > Cheers, Lorenzo Let me play around on my test box roughly and see if I can repro