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[2003:d8:2f49:bc00:12fa:1681:c754:1630]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-458953eaeeesm359376465e9.25.2025.08.07.03.21.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 07 Aug 2025 03:21:20 -0700 (PDT) Message-ID: <97419aca-af5f-4328-84dc-c97bb73ca1ac@redhat.com> Date: Thu, 7 Aug 2025 12:21:18 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [linus:master] [mm] f822a9a81a: stress-ng.bigheap.realloc_calls_per_sec 37.3% regression To: Lorenzo Stoakes , kernel test robot Cc: Dev Jain , 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> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 78663100003 X-Stat-Signature: ofh6uzegyqxu97fncenw69t6xfew3kxw X-HE-Tag: 1754562084-637360 X-HE-Meta: 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 bVknzSJX 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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 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? -- Cheers, David / dhildenb