[root@dell-per6515-03 linux]# nproc 128 [root@dell-per6515-03 linux]# free -h total used free shared buff/cache available Mem: 124Gi 2.6Gi 122Gi 21Mi 402Mi 122Gi Swap: 4.0Gi 0B 4.0Gi 1)linux-next kernel w/o improving code from Uladzislau ------------------------------------------------------- [root@dell-per6515-03 linux]# time tools/testing/selftests/mm/test_vmalloc.sh run_test_mask=127 nr_threads=64 Run the test with following parameters: run_test_mask=127 nr_threads=64 Done. Check the kernel ring buffer to see the summary. real 4m28.018s user 0m0.015s sys 0m4.712s [root@dell-per6515-03 ~]# sort -h /proc/allocinfo | tail -10 21405696 5226 mm/memory.c:1122 func:folio_prealloc 26199936 7980 kernel/fork.c:309 func:alloc_thread_stack_node 29822976 7281 mm/readahead.c:247 func:page_cache_ra_unbounded 99090432 96768 drivers/iommu/iova.c:604 func:iova_magazine_alloc 107638784 6320 mm/readahead.c:468 func:ra_alloc_folio 120560528 29439 mm/mm_init.c:2521 func:alloc_large_system_hash 134742016 32896 mm/percpu-vm.c:95 func:pcpu_alloc_pages 263192576 64256 mm/page_ext.c:270 func:alloc_page_ext 266797056 65136 include/linux/mm.h:2848 func:pagetable_alloc 507617280 32796 mm/slub.c:2305 func:alloc_slab_page [root@dell-per6515-03 ~]# [root@dell-per6515-03 ~]# [root@dell-per6515-03 linux]# time tools/testing/selftests/mm/test_vmalloc.sh run_test_mask=127 nr_threads=128 Run the test with following parameters: run_test_mask=127 nr_threads=128 Done. Check the kernel ring buffer to see the summary. real 6m19.328s user 0m0.005s sys 0m9.476s [root@dell-per6515-03 ~]# sort -h /proc/allocinfo | tail -10 21405696 5226 mm/memory.c:1122 func:folio_prealloc 26889408 8190 kernel/fork.c:309 func:alloc_thread_stack_node 29822976 7281 mm/readahead.c:247 func:page_cache_ra_unbounded 99090432 96768 drivers/iommu/iova.c:604 func:iova_magazine_alloc 107638784 6320 mm/readahead.c:468 func:ra_alloc_folio 120560528 29439 mm/mm_init.c:2521 func:alloc_large_system_hash 134742016 32896 mm/percpu-vm.c:95 func:pcpu_alloc_pages 263192576 64256 mm/page_ext.c:270 func:alloc_page_ext 550068224 34086 mm/slub.c:2305 func:alloc_slab_page 664535040 162240 include/linux/mm.h:2848 func:pagetable_alloc [root@dell-per6515-03 ~]# [root@dell-per6515-03 ~]# [root@dell-per6515-03 linux]# time tools/testing/selftests/mm/test_vmalloc.sh run_test_mask=127 nr_threads=256 Run the test with following parameters: run_test_mask=127 nr_threads=256 Done. Check the kernel ring buffer to see the summary. real 19m10.657s user 0m0.015s sys 0m20.959s [root@dell-per6515-03 ~]# sort -h /proc/allocinfo | tail -10 22441984 5479 mm/shmem.c:1634 func:shmem_alloc_folio 26758080 8150 kernel/fork.c:309 func:alloc_thread_stack_node 35880960 8760 mm/readahead.c:247 func:page_cache_ra_unbounded 99090432 96768 drivers/iommu/iova.c:604 func:iova_magazine_alloc 120560528 29439 mm/mm_init.c:2521 func:alloc_large_system_hash 122355712 7852 mm/readahead.c:468 func:ra_alloc_folio 134742016 32896 mm/percpu-vm.c:95 func:pcpu_alloc_pages 263192576 64256 mm/page_ext.c:270 func:alloc_page_ext 708231168 50309 mm/slub.c:2305 func:alloc_slab_page 1107296256 270336 include/linux/mm.h:2848 func:pagetable_alloc [root@dell-per6515-03 ~]# 2)linux-next kernel with improving code from Uladzislau ----------------------------------------------------- [root@dell-per6515-03 linux]# time tools/testing/selftests/mm/test_vmalloc.sh run_test_mask=127 nr_threads=64 Run the test with following parameters: run_test_mask=127 nr_threads=64 Done. Check the kernel ring buffer to see the summary. real 4m27.226s user 0m0.006s sys 0m4.709s [root@dell-per6515-03 linux]# sort -h /proc/allocinfo | tail -10 38023168 9283 mm/readahead.c:247 func:page_cache_ra_unbounded 72228864 17634 fs/xfs/xfs_buf.c:390 [xfs] func:xfs_buf_alloc_pages 99090432 96768 drivers/iommu/iova.c:604 func:iova_magazine_alloc 99863552 97523 fs/xfs/xfs_icache.c:81 [xfs] func:xfs_inode_alloc 120560528 29439 mm/mm_init.c:2521 func:alloc_large_system_hash 136314880 33280 mm/percpu-vm.c:95 func:pcpu_alloc_pages 184176640 10684 mm/readahead.c:468 func:ra_alloc_folio 263192576 64256 mm/page_ext.c:270 func:alloc_page_ext 284700672 69507 include/linux/mm.h:2848 func:pagetable_alloc 601427968 36377 mm/slub.c:2305 func:alloc_slab_page [root@dell-per6515-03 linux]# time tools/testing/selftests/mm/test_vmalloc.sh run_test_mask=127 nr_threads=128 Run the test with following parameters: run_test_mask=127 nr_threads=128 Done. Check the kernel ring buffer to see the summary. real 6m16.960s user 0m0.007s sys 0m9.465s [root@dell-per6515-03 linux]# sort -h /proc/allocinfo | tail -10 38158336 9316 mm/readahead.c:247 func:page_cache_ra_unbounded 72220672 17632 fs/xfs/xfs_buf.c:390 [xfs] func:xfs_buf_alloc_pages 99090432 96768 drivers/iommu/iova.c:604 func:iova_magazine_alloc 99863552 97523 fs/xfs/xfs_icache.c:81 [xfs] func:xfs_inode_alloc 120560528 29439 mm/mm_init.c:2521 func:alloc_large_system_hash 136314880 33280 mm/percpu-vm.c:95 func:pcpu_alloc_pages 184504320 10710 mm/readahead.c:468 func:ra_alloc_folio 263192576 64256 mm/page_ext.c:270 func:alloc_page_ext 427884544 104464 include/linux/mm.h:2848 func:pagetable_alloc 697311232 45159 mm/slub.c:2305 func:alloc_slab_page [root@dell-per6515-03 linux]# time tools/testing/selftests/mm/test_vmalloc.sh run_test_mask=127 nr_threads=256 Run the test with following parameters: run_test_mask=127 nr_threads=256 Done. Check the kernel ring buffer to see the summary. real 21m15.673s user 0m0.008s sys 0m20.259s [root@dell-per6515-03 linux]# sort -h /proc/allocinfo | tail -10 38158336 9316 mm/readahead.c:247 func:page_cache_ra_unbounded 72224768 17633 fs/xfs/xfs_buf.c:390 [xfs] func:xfs_buf_alloc_pages 99090432 96768 drivers/iommu/iova.c:604 func:iova_magazine_alloc 99863552 97523 fs/xfs/xfs_icache.c:81 [xfs] func:xfs_inode_alloc 120560528 29439 mm/mm_init.c:2521 func:alloc_large_system_hash 136314880 33280 mm/percpu-vm.c:95 func:pcpu_alloc_pages 184504320 10710 mm/readahead.c:468 func:ra_alloc_folio 263192576 64256 mm/page_ext.c:270 func:alloc_page_ext 506974208 123773 include/linux/mm.h:2848 func:pagetable_alloc 809504768 53621 mm/slub.c:2305 func:alloc_slab_page [root@dell-per6515-03 linux]# time tools/testing/selftests/mm/test_vmalloc.sh run_test_mask=127 nr_threads=256 Run the test with following parameters: run_test_mask=127 nr_threads=256 Done. Check the kernel ring buffer to see the summary. real 21m36.580s user 0m0.012s sys 0m19.912s [root@dell-per6515-03 linux]# sort -h /proc/allocinfo | tail -10 38977536 9516 mm/readahead.c:247 func:page_cache_ra_unbounded 72273920 17645 fs/xfs/xfs_buf.c:390 [xfs] func:xfs_buf_alloc_pages 99090432 96768 drivers/iommu/iova.c:604 func:iova_magazine_alloc 99895296 97554 fs/xfs/xfs_icache.c:81 [xfs] func:xfs_inode_alloc 120560528 29439 mm/mm_init.c:2521 func:alloc_large_system_hash 141033472 34432 mm/percpu-vm.c:95 func:pcpu_alloc_pages 186064896 10841 mm/readahead.c:468 func:ra_alloc_folio 263192576 64256 mm/page_ext.c:270 func:alloc_page_ext 541237248 132138 include/linux/mm.h:2848 func:pagetable_alloc 694718464 41216 mm/slub.c:2305 func:alloc_slab_page