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46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: UI/Wb7BDUC0PfEz40ihvzXSD5hToMThuI/h5Ox/d+dEBg6V+bPLBlQIdHmX6Pp1lVg/GCc+vT+lQfFpANdv/SQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR11MB8272 X-OriginatorOrg: intel.com hi, Uladzislau Rezki, On Wed, Dec 17, 2025 at 12:04:20PM +0100, Uladzislau Rezki wrote: > Hello, Oliver. > > > > > > > > > Hello, > > > > > > > > kernel test robot noticed a 21.3% regression of stress-ng.bigheap.realloc_calls_per_sec on: > > > > > > > > > > > > commit: 9c47753167a6a585d0305663c6912f042e131c2d ("mm/vmalloc: defer freeing partly initialized vm_struct") > > > > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master > > > > > > > > [still regression on linus/master c9b47175e9131118e6f221cc8fb81397d62e7c91] > > > > [still regression on linux-next/master 008d3547aae5bc86fac3eda317489169c3fda112] > > > > > > > > testcase: stress-ng > > > > config: x86_64-rhel-9.4 > > > > compiler: gcc-14 > > > > test machine: 256 threads 2 sockets Intel(R) Xeon(R) 6767P CPU @ 2.4GHz (Granite Rapids) with 256G 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/202512121138.986f6a6b-lkp@intel.com > > > > > > > > > > > > [...] > > > > > > > > > Could you please test below patch and confirm if it solves regression: > > > > we directly apply the patch upon 9c47753167, so our test branch looks like below > > > > * f7991e8a0136cb <---- below patch from you > > * 9c47753167a6a5 mm/vmalloc: defer freeing partly initialized vm_struct > > * 86e968d8ca6dc8 mm/vmalloc: support non-blocking GFP flags in alloc_vmap_area() > > > > but found it has little performance impacts > > > > ========================================================================================= > > compiler/cpufreq_governor/kconfig/nr_threads/rootfs/tbox_group/test/testcase/testtime: > > gcc-14/performance/x86_64-rhel-9.4/100%/debian-13-x86_64-20250902.cgz/lkp-gnr-2sp3/bigheap/stress-ng/60s > > > > 86e968d8ca6dc823 9c47753167a6a585d0305663c69 f7991e8a0136cb0fdf35f11e28a > > ---------------- --------------------------- --------------------------- > > %stddev %change %stddev %change %stddev > > \ | \ | \ > > 48320196 -10.9% 43072080 -10.8% 43116499 stress-ng.bigheap.ops > > 785159 -9.8% 708390 -9.7% 708644 stress-ng.bigheap.ops_per_sec > > 879805 -21.3% 692805 -20.7% 697312 stress-ng.bigheap.realloc_calls_per_sec > > > Thank you for testing. I had same expectations. No difference. > Honestly i can not figure out how: > > * 9c47753167a6a5 mm/vmalloc: defer freeing partly initialized vm_struct > * 86e968d8ca6dc8 mm/vmalloc: support non-blocking GFP flags in alloc_vmap_area() > > can effect performance. I am not doing anything related to performance. > I would like to ask you if you could test one more thing. I see that > > [still regression on linus/master c9b47175e9131118e6f221cc8fb81397d62e7c91] > > contains also below patch: > > > commit a0615780439938e8e61343f1f92a4c54a71dc6a5 > mm/vmalloc: request large order pages from buddy allocator > > > where we try to use larger order for vmalloc. Could you please revert > it and rerun same tests? > > Thank you in advance! we've seen comments from Mateusz Guzik in https://lore.kernel.org/all/e4b6sjeh22uqhxhxudsbanlnyo2potwowuy7mkrp6tvxnftjn4@mcjyes2s3eu6/ that this could be related with cacheline bouncing. not sure if you still want us to do the test you mentioned? if so, sorry that I cannot make a clean covert of a061578043993 on c9b47175e9131. could you prepare a patch for us? thanks > > -- > Uladzislau Rezki