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b=YTWZ/DoRqfQ4oMrfi3C4NmRANg+ReFTYMSo3OBKLqmNvt6lAw2ZcxRH1LvF9hte+dy9iVRpcmnAAJ4JCrPodeTvyDJIWxJeJERVzQTEaIxu6c9bY114ZFFXeUaa3YdFvfnqz635sq3Z4f8L6fyXUjBZGSywyA9GRDu8YCmL86yA= Authentication-Results-Original: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=arm.com; Received: from AM9PR08MB7120.eurprd08.prod.outlook.com (2603:10a6:20b:3dc::22) by DB8PR08MB5418.eurprd08.prod.outlook.com (2603:10a6:10:116::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9009.16; Thu, 7 Aug 2025 16:06:47 +0000 Received: from AM9PR08MB7120.eurprd08.prod.outlook.com ([fe80::2933:29aa:2693:d12e]) by AM9PR08MB7120.eurprd08.prod.outlook.com ([fe80::2933:29aa:2693:d12e%5]) with mapi id 15.20.9009.013; Thu, 7 Aug 2025 16:06:46 +0000 Message-ID: <96e931a6-c70e-4a11-9e8c-c5a08da7f512@arm.com> Date: Thu, 7 Aug 2025 21:36:38 +0530 User-Agent: Mozilla Thunderbird Subject: Re: [linus:master] [mm] f822a9a81a: stress-ng.bigheap.realloc_calls_per_sec 37.3% regression To: David Hildenbrand , Lorenzo Stoakes , kernel test robot Cc: 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> Content-Language: en-US From: Dev Jain In-Reply-To: <97419aca-af5f-4328-84dc-c97bb73ca1ac@redhat.com> Content-Type: text/plain; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Aug 2025 16:07:18.7321 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 01042c0b-1f90-481e-726b-08ddd5cc7c18 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: DB3PEPF00008859.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM9PR08MB6706 X-Rspamd-Queue-Id: 589F240013 X-Stat-Signature: a4zramu9fsmid8oon8wboc39io9kt96g X-Rspam-User: X-Rspamd-Server: rspam07 X-HE-Tag: 1754582843-229872 X-HE-Meta: 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 sBamU1ov 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 07/08/25 3:51 pm, David Hildenbrand wrote: > On 07.08.25 10:27, Lorenzo Stoakes wrote: >> On Thu, Aug 07, 2025 at 04:17:09PM +0800, kernel test robot wrote: >>> >>> >>> Hello, >>> >>> kernel test robot noticed a 37.3% regression of >>> stress-ng.bigheap.realloc_calls_per_sec on: >>> >> >> Dev - could you please investigate and provide a fix for this as a >> priority? As these numbers are quite scary (unless they're somehow super >> synthetic or not meaningful or something). >> >>> >>> commit: f822a9a81a31311d67f260aea96005540b18ab07 ("mm: optimize >>> mremap() by PTE batching") >>> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master >>> >>> [still regression on      linus/master >>> 186f3edfdd41f2ae87fc40a9ccba52a3bf930994] >>> [still regression on linux-next/master >>> b9ddaa95fd283bce7041550ddbbe7e764c477110] >>> >>> testcase: stress-ng >>> config: x86_64-rhel-9.4 >>> compiler: gcc-12 >>> test machine: 192 threads 2 sockets Intel(R) Xeon(R) Platinum 8468V  >>> CPU @ 2.4GHz (Sapphire Rapids) with 384G memory >>> parameters: >>> >>>     nr_threads: 100% >>>     testtime: 60s >>>     test: bigheap >>>     cpufreq_governor: performance >>> >>> >>> >>> >>> If you fix the issue in a separate patch/commit (i.e. not just a new >>> version of >>> the same patch/commit), kindly add following tags >>> | Reported-by: kernel test robot >>> | Closes: >>> https://lore.kernel.org/oe-lkp/202508071609.4e743d7c-lkp@intel.com >>> >>> >>> Details are as below: >>> --------------------------------------------------------------------------------------------------> >>> >>> >>> >>> The kernel config and materials to reproduce are available at: >>> https://download.01.org/0day-ci/archive/20250807/202508071609.4e743d7c-lkp@intel.com >>> >>> >>> ========================================================================================= >>> >>> compiler/cpufreq_governor/kconfig/nr_threads/rootfs/tbox_group/test/testcase/testtime: >>> >>> gcc-12/performance/x86_64-rhel-9.4/100%/debian-12-x86_64-20240206.cgz/igk-spr-2sp1/bigheap/stress-ng/60s >>> >>> 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 >>>        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...