From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.14]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7FD23369D5E for ; Thu, 13 Aug 2026 13:16:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.14 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786626992; cv=none; b=mnAb33sDiA6UI3zLxnFr5QYYk51BMFH+2fl3eIhKHRuIVubSliwIrpK5renBOLNEI349LYlhvu1xHniALga/1KJK9i1pLEKhVkNw6hSU1tg8OTo0XNDfm+sh6qOYPuZy8tbqejq8zBP+o6jLVWkd6oFBt1a9QAuxRUdCuR5AWjQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786626992; c=relaxed/simple; bh=Lf9SZ0pwZEYsjvNWHi7qkXhT5ob7kt+GLztd/lIRdy4=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition; b=XiN4id0CYCKdF9cKr091kAmL7Pz/T2deEp7kkrGPLct4im28VG+6ZgdaZBpSDmR+2tSkQOSme7jyT9dz/rqppBkHh16RLaBt1e0oyydQERDWoa3SzUwY4QSKwITCTYMGheag1IGZvywxKghSdwv4g1k8CpP2uHqa9SjfL29ugAQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=PgzDiNbF; arc=none smtp.client-ip=192.198.163.14 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="PgzDiNbF" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1786626990; x=1818162990; h=date:from:to:cc:subject:message-id:mime-version; bh=Lf9SZ0pwZEYsjvNWHi7qkXhT5ob7kt+GLztd/lIRdy4=; b=PgzDiNbFV/bhFTRXCFmBewZw6rJY2wD/VJXboXVmCXMM20vVonmGHgKj rq0XsUApG71ecOSoPQK3jqxzwHdoMYp0v1/RJoO0UaQ9LqGGgZhOcfTSf 2oJo7B4LQweY2PUZ9+yAvLVr+17XDqeIysAjlrqdWAAG2ZicmJBDamDf5 BjNL2nrs2idr9nEYJgnS8gSlEZCoHrCQoJd6AVfAlpR4IZu6PBjSHv6Rh BevKqTEhrzg2w03pG/5hHN3YUBWUatsp2V2Ksph/4HNCSpWnQ2hpq7tqV 4aZahjJHmb2CQcOL6IJXq8vDQVjHAF4VhcjzQg5vmHVwR4mbX/0lHuoI5 Q==; X-CSE-ConnectionGUID: HXkigvwyQOqIiYq1An9Qhw== X-CSE-MsgGUID: 0p5iinJtR2aXyp/c233ICw== X-IronPort-AV: E=McAfee;i="6800,10657,11873"; a="87221297" X-IronPort-AV: E=Sophos;i="6.25,221,1779174000"; d="scan'208";a="87221297" Received: from orviesa003.jf.intel.com ([10.64.159.143]) by fmvoesa108.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Aug 2026 06:16:29 -0700 X-CSE-ConnectionGUID: Je51M1g8RjO4yb82bTtaMg== X-CSE-MsgGUID: a8tbCZAETQO+2o7tS8Y+JQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.25,221,1779174000"; d="scan'208";a="267454311" Received: from ly-workstation.sh.intel.com (HELO ly-workstation) ([10.239.182.64]) by ORVIESA003-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Aug 2026 06:16:26 -0700 Date: Thu, 13 Aug 2026 21:16:22 +0800 From: kernel test robot To: Usama Arif Cc: oe-lkp@lists.linux.dev, lkp@intel.com, Andrew Morton , Shakeel Butt , David Hildenbrand , Johannes Weiner , "Liam R. 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> Precedence: bulk X-Mailing-List: oe-lkp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline 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