From: kernel test robot <yi1.lai@intel.com>
To: Usama Arif <usama.arif@linux.dev>
Cc: oe-lkp@lists.linux.dev, lkp@intel.com,
"Andrew Morton" <akpm@linux-foundation.org>,
"Shakeel Butt" <shakeel.butt@linux.dev>,
"David Hildenbrand" <david@kernel.org>,
"Johannes Weiner" <hannes@cmpxchg.org>,
"Liam R. Howlett" <liam@infradead.org>,
"Lorenzo Stoakes" <ljs@kernel.org>,
"Michal Hocko" <mhocko@suse.com>,
"Michal Koutný" <mkoutny@suse.com>,
"Mike Rapoport" <rppt@kernel.org>,
"Roman Gushchin" <roman.gushchin@linux.dev>,
"Suren Baghdasaryan" <surenb@google.com>,
"Tejun Heo" <tj@kernel.org>,
"Vlastimil Babka" <vbabka@kernel.org>,
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
Date: Thu, 13 Aug 2026 21:16:22 +0800 [thread overview]
Message-ID: <202608131743.c6a7dda4-lkp@intel.com> (raw)
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 <yi1.lai@intel.com>
| 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
reply other threads:[~2026-08-13 13:16 UTC|newest]
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