This shows 15.02 GiB while only around 200 MiB is free:

sudo cat /proc/allocinfo | tail -n +3 | awk '{print $1}' | tr '\n' + | xargs cpc | numfmt --to iec-i --format '%.2f'

Does this mean that it shows cumulative sum of used+cached memory?

Over 10 MiB:

     10.58Mi      243 mm/util.c:174 func:kvmemdup
     11.07Mi     2840 kernel/bpf/syscall.c:396 func:__bpf_map_area_alloc
     11.08Mi   161263 security/security.c:755 func:lsm_inode_alloc
     11.13Mi     2848 mm/percpu-vm.c:95 func:pcpu_alloc_pages
     12.31Mi     2619 kernel/fork.c:180 func:alloc_task_struct_node
     13.88Mi    82681 kernel/fork.c:487 func:vm_area_dup
     16.01Mi     4097 drivers/net/wireless/intel/iwlwifi/pcie/rx.c:391 [iwlwifi] func:iwl_pcie_rx_alloc_page
     24.25Mi     6208 mm/page_ext.c:271 func:alloc_page_ext
     26.00Mi       16 fs/btrfs/zstd.c:366 [btrfs] func:zstd_alloc_workspace
     38.67Mi   211151 fs/dcache.c:1664 func:__d_alloc
     41.29Mi    13185 kernel/fork.c:314 func:alloc_thread_stack_node
     41.57Mi    11530 mm/execmem.c:44 func:execmem_vmalloc
     50.61Mi     2245 mm/slub.c:2425 func:alloc_slab_page
     69.11Mi    17690 arch/x86/mm/pgtable.c:44 func:pte_alloc_one
     69.83Mi    17874 drivers/iommu/dma-iommu.c:920 func:__iommu_dma_alloc_pages
     93.71Mi   168250 lib/xarray.c:377 func:xas_alloc
    104.27Mi    26692 mm/filemap.c:1969 func:__filemap_get_folio
    107.77Mi    27587 mm/shmem.c:1863 func:shmem_alloc_folio
    126.64Mi   130691 fs/btrfs/inode.c:7694 [btrfs] func:btrfs_alloc_inode
    362.05Mi    92683 fs/btrfs/compression.c:477 [btrfs] func:add_ra_bio_pages
    546.53Mi    43777 mm/slub.c:2423 func:alloc_slab_page
    669.41Mi   171368 fs/btrfs/extent_io.c:631 [btrfs] func:btrfs_alloc_page_array
    795.85Mi   203736 mm/memory.c:1062 func:folio_prealloc
      1.47Gi     1270 drivers/gpu/drm/ttm/ttm_pool.c:97 [ttm] func:ttm_pool_alloc_page
      4.70Gi  1230002 mm/memory.c:1060 func:folio_prealloc
      5.11Gi  1338120 mm/readahead.c:186 func:ractl_alloc_folio