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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Aug 2025 17:12:03.2375 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 5c3ca2eb-3868-4667-3922-08ddd5d5876f X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: DB1PEPF000509ED.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS1PR08MB7499 On 07/08/25 10:37 pm, Lorenzo Stoakes wrote: > On Thu, Aug 07, 2025 at 10:34:43PM +0530, Dev Jain wrote: >> On 07/08/25 9:46 pm, Lorenzo Stoakes wrote: >>> On Thu, Aug 07, 2025 at 05:10:17PM +0100, Lorenzo Stoakes wrote: >>>> On Thu, Aug 07, 2025 at 09:36:38PM +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 >> 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. >> > Are you testing that on x86-64 bare metal? Qemu VM on x86-64. > > Anyway this is _not_ what I get. > > I am testing on my test box, and seeing a _very significant_ regression as reported. > > I am narrowing down the exact cause and will report back. Non-NUMA box, recent > uArch, dedicated machine. Oops. Thanks for testing. Lemme stare at my patch for some more time :) > > Cheers, Lorenzo