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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Aug 2025 08:56:48.5462 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ee6e6962-8bf7-4ccb-7430-08ddd5905819 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: DB1PEPF00050A01.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: GV1PR08MB8356 X-Rspam-User: X-Rspamd-Queue-Id: C8C31A0007 X-Rspamd-Server: rspam06 X-Stat-Signature: jhprqh9jdkdptndpwdprd17u98goeunc X-HE-Tag: 1754557018-235185 X-HE-Meta: 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 1LsFXmpF bZo05/sDX6VFYhk0sl3kf7ojHlAOYBLlCfQROiJqsQ/YUAMCkVH4Zquz68OMq2sjPI6kDiHpcvNHX+eIKW7nNH++cJmE1kixEEvI9D2QfvAYa4b25RJ16f7wLTQQb35+XNZt/ilny5vcmaTAGAxe8OGc6bAiGabNvS487Qb46PRDkhgrtIIvIFV8mXu+m0OgypzczHz0O23+d4T9OzgN/ssEescoEdnIUk6CcPLABgh6ljjMCdtjY54MthwNr7hMpG3VNcRgqOzvpFOnQZW6KXYH10fnVTZ1WuNHEjpqN5L/aKI8ECmdMENJ4xX0FsHD3Ork7kxUXCrHaDda0BU6EJNCY+7MJqGd4zzTpIy2bVKGkCzNHy1kofUHFjOi4J2bMX2BZavOG6iFp1soTG7HC1svC7WHjr3GVEkLnS3y8IJfB3Hh72jAsdbV5V/l9rm0lGGUHq6HNtRBF0C1nZJcm9DMAx/Ho51i8yGuPhDlbERAbU6yFrzTd9wkjBkjNDmUY/vkW/1NKygf1VcgQgGTycCPu2DpqB1B4yWDd7uJ3ditVdR3dRtmNpE7LXw4UvdMlsAVcSvkikytUtj7myOmNCl48caOSI2ylQrAoZkKGGxTN8AthfEDl8dSn52caEM3j2ciOipUd+HXXaKAuvZ+KQNbtnguXevs8CoKq8vhDI1taESWyrzo8bVpnUL4HxXWzhg7qjWHLqmAaZdsZQOAGQ5jNcFO2FlvPybxI 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 1:57 pm, 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). Yup I'll start looking. > >> 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... > > Yikes.