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7JPOLCyR0t1TQanTPc7WFzZDsrWV8hBvGveJZ8/GPG0G7AQDvQHFET45EEGDdSfCmlBLSAv59Gk= 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 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... Yikes.