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stress-ng.bigheap.realloc_calls_per_sec 37.3% regression To: Lorenzo Stoakes Cc: David Hildenbrand , kernel test robot , oe-lkp@lists.linux.dev, lkp@intel.com, linux-kernel@vger.kernel.org, Andrew Morton , Barry Song , Pedro Falcato , Anshuman Khandual , Bang Li , Baolin Wang , bibo mao , Hugh Dickins , Ingo Molnar , Jann Horn , Lance Yang , Liam Howlett , Matthew Wilcox , Peter Xu , Qi Zheng , Ryan Roberts , Vlastimil Babka , Yang Shi , Zi Yan , linux-mm@kvack.org References: <202508071609.4e743d7c-lkp@intel.com> <9e3a59b2-11c0-43ca-aff3-414091f04aa4@lucifer.local> <97419aca-af5f-4328-84dc-c97bb73ca1ac@redhat.com> <96e931a6-c70e-4a11-9e8c-c5a08da7f512@arm.com> <66f44615-8df5-4e81-97b7-1f6a01401687@lucifer.local> <923f1a9a-4e34-4922-ae2c-c8d974c2522b@lucifer.local> Content-Language: en-US From: Dev Jain In-Reply-To: <923f1a9a-4e34-4922-ae2c-c8d974c2522b@lucifer.local> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: 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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 So I tested with ./stress-ng --timeout 1 --times --verify --metrics --no-rand-seed --oom-avoid --bigheap 20 extracted the number out of the line containing the output "realloc calls per sec", did an avg and standard deviation over 20 runs. Before the patch: Average realloc calls/sec: 196907.380000 Standard deviation : 12685.721021 After the patch: Average realloc calls/sec: 187894.300500 Standard deviation : 12494.153533 which is 5% approx.