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Howlett" , Lorenzo Stoakes , Michal Hocko , Michal =?iso-8859-1?Q?Koutn=FD?= , Mike Rapoport , Roman Gushchin , Suren Baghdasaryan , Tejun Heo , Vlastimil Babka , linux-mm@kvack.org, cgroups@vger.kernel.org, yi1.lai@intel.com Subject: [linux-next:master] [mm/vmpressure] ea928e9e18: stress-ng.mremap.ops_per_sec 36.2% regression Message-ID: <202608131743.c6a7dda4-lkp@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Rspam-User: X-Rspamd-Queue-Id: AEABF140003 X-Rspamd-Server: rspam07 X-Stat-Signature: bz535w9i1o14bju75tdqjeiyembhkadd X-HE-Tag: 1786626991-938738 X-HE-Meta: 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 pQ5nhoPg NN7eAZW8u/Ss//nIP+lq6lgcs4xQ68I+0PsjjMnlArM0SiZ6HCr12JiI452cDWDUDFzCgtfH0AOL6AYncZVWHdtVkaaSeZf//IWJA5jLZpIHg4QV2hPr7CxqhYp7RYER0+YGicZI7UM3lc62YUR9pT83QjHUvdL/5gn6UpAPJH73E963WQ4iEU9wJ1Q1o/Z2GqWgwpsVbKA9i+E4QgEx/P1sxI05FTGFEE4ZJyMPFF6O74WpKtaPfmnZgSY40cubfxpeQIae845N1rGGw+WmKtyYKR4Kg6jQWt0EqVF0donoHH/44pWNwyoNjT+IhEmZORAnHG9UghZIaV1XQdqXtnT+WN7a4RDXm0eQHNVW7EmL/fGKXw111ZRffYA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello, kernel test robot noticed a 36.2% regression of stress-ng.mremap.ops_per_sec on: commit: ea928e9e18da682e9a5bc40aa862bff7ce5ae42e ("mm/vmpressure: move v1 userspace eventfd code into memcontrol-v1.c") https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master in testcase: stress-ng version: stress-ng-x86_64-29ce10a2c-1_20260712 with following parameters: nr_threads: 100% testtime: 60s test: mremap cpufreq_governor: performance config: x86_64-rhel-9.4 (CONFIG_MEMCG=y and CONFIG_MEMCG_V1 is not set) compiler: gcc-14 test machine: 256 threads 4 sockets INTEL(R) XEON(R) PLATINUM 8592+ (Emerald Rapids) with 256G memory (please refer to attached dmesg/kmsg for entire log/backtrace) 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/202608131743.c6a7dda4-lkp@intel.com 2026-08-11 09:13:23 sysctl -w kernel.sched_autogroup_enabled=0 kernel.sched_autogroup_enabled = 0 2026-08-11 09:13:23 stress-ng --timeout 60 --times --verify --metrics --no-rand-seed --mremap 256 stress-ng: info: [10886] setting to a 1 min run per stressor stress-ng: info: [10886] dispatching hogs: 256 mremap stress-ng: info: [11033] mremap: using 1MB per stressor instance (total 256MB of 243.06GB available memory) stress-ng: metrc: [10886] stressor bogo ops real time usr time sys time bogo ops/s bogo ops/s CPU used per RSS Max stress-ng: metrc: [10886] (secs) (secs) (secs) (real time) (usr+sys time) instance (%) (KB) stress-ng: metrc: [10886] mremap 2212529 59.96 209.34 15014.92 36901.22 145.33 99.19 6684 stress-ng: metrc: [10886] miscellaneous metrics: stress-ng: metrc: [10886] mremap 151372.07 nanosecs per mremap call (harmonic mean of 256 instances) stress-ng: info: [10886] for a 60.01s run time: stress-ng: info: [10886] 15363.58s available CPU time stress-ng: info: [10886] 209.34s user time ( 1.36%) stress-ng: info: [10886] 15015.19s system time ( 97.73%) stress-ng: info: [10886] 15224.53s total time ( 99.09%) stress-ng: info: [10886] load average: 163.54 47.28 16.30 stress-ng: info: [10886] skipped: 0 stress-ng: info: [10886] passed: 256: mremap (256) stress-ng: info: [10886] failed: 0 stress-ng: info: [10886] metrics untrustworthy: 0 stress-ng: info: [10886] successful run completed in 1 min The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20260813/202608131743.c6a7dda4-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki