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This lead me (thanks, = Lance!) to enabling CONFIG_MEM_ALLOC_PROFILING=3Dy. I then saved /proc/allo= cinfo before and after my workloads. I then used a script to collect the tw= o reports, determine what grew, and sort it by how each tagged allocation g= rew. I got a bunch of suspicious things, but I couldn't trace any of it back to = anything I were doing. For example, I tried to collect kstacks with bpftrac= e by kprobing any of these functions I could. I mostly had to get near them= because a lot didn't have direct trace points. I haven't tried with manual= ly-inserted trace points yet. After multiple experiments, I took it back to a stock kernel (6.17, tag v6.= 17 commit e5f0a698b34ed76002dc5cff3804a61c80233a7a) and just let it sit idl= e for a few days. This still generated some growth: Growth NewSize TagInfo =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 676085760 820760576 mm/slub.c:2492 func:alloc_slab_page 591151104 672784384 mm/filemap.c:1981 func:__filemap_get_folio 528635360 532319824 fs/ext4/super.c:1384 func:ext4_alloc_inode 187793408 325976064 mm/readahead.c:186 func:ractl_alloc_folio 95700288 103415040 fs/dcache.c:1690 func:__d_alloc 29970432 63787008 mm/slub.c:2494 func:alloc_slab_page 20316160 39485440 mm/percpu-vm.c:95 func:pcpu_alloc_pages 15044120 16415048 fs/buffer.c:3025 func:alloc_buffer_head 3116224 8994768 lib/xarray.c:378 func:xas_alloc 2138208 4317472 mm/percpu.c:512 func:pcpu_mem_zalloc I don't entirely know what I'm looking at with all this yet; kernel memory = management beyond kmalloc and vmalloc wasn't really on my 2025 bingo card. = I only listened to a talk about folios after I first saw this stuff and did= n't know they were a thing before now. There are a few things I can still d= o to try to normalize my setup like taking it to a stock Linux image of som= e kind in QEMU, but I was hoping for some advice before I keep slashing awa= y. If there's one quirky thing to disclose, it's that the file system is ex= t3. First, is any of that information actually relevant? Like, I wonder if I'm = just looking at some records that are known to not have their corresponding= free operations properly correlated. Second, would any of that actually be= relevant to progressive growth of vmap_area?