Re: git: c849eb8f1925 - main - nullfs: Add the vfs.nullfs.cache_nodes sysctl to control nocache default [unknown oid 'vfs.nullfs.cache_nodes']

From: Mark Millard <marklmi_at_yahoo.com>
Date: Sun, 17 Mar 2024 04:18:12 UTC 
Both an official PkgBase install and a personal build do not find the new oid for this for main:

# uname -apKU
FreeBSD 7950X3D-ZFS 15.0-CURRENT FreeBSD 15.0-CURRENT main-n268827-75464941dc17 GENERIC-NODEBUG amd64 amd64 1500015 1500015

# uname -apKU
FreeBSD 7950X3D-ZFS 15.0-CURRENT FreeBSD 15.0-CURRENT #139 main-n268827-75464941dc17-dirty: Sun Mar 17 03:16:30 UTC 2024     root@7950X3D-ZFS:/usr/obj/BUILDs/main-amd64-nodbg-clang/usr/main-src/amd64.amd64/sys/GENERIC-NODBG amd64 amd64 1500015 1500015

The results are:

# sysctl -d vfs.nullfs.cache_nodes
sysctl: unknown oid 'vfs.nullfs.cache_nodes'

# sysctl -a | grep vnode
kern.maxvnodes: 3224925
kern.ipc.umtx_vnode_persistent: 0
vm.vnode_pbufs: 2048
vm.stats.vm.v_vnodepgsout: 0
vm.stats.vm.v_vnodepgsin: 4923
vm.stats.vm.v_vnodeout: 0
vm.stats.vm.v_vnodein: 662
vfs.wantfreevnodes: 806231
vfs.freevnodes: 1323
vfs.vnodes_created: 3654
vfs.numvnodes: 1807
vfs.vnode.vnlru.uma_reclaim_calls: 0
vfs.vnode.vnlru.kicks: 0
vfs.vnode.vnlru.max_free_per_call: 10000
vfs.vnode.vnlru.failed_runs: 0
vfs.vnode.vnlru.direct_recycles_free: 0
vfs.vnode.vnlru.recycles_free: 0
vfs.vnode.vnlru.recycles: 0
vfs.vnode.stats.alloc_sleeps: 0
vfs.vnode.stats.free: 1323
vfs.vnode.stats.skipped_requeues: 0
vfs.vnode.stats.created: 3654
vfs.vnode.stats.count: 1807
vfs.vnode.param.wantfree: 806231
vfs.vnode.param.limit: 3224925
vfs.cache.debug.vnodes_cel_3_failures: 0
vfs.cache.stats.heldvnodes: 119
debug.vnode_domainset: <NULL>
debug.sizeof.vnode: 448
debug.fail_point.status_fill_kinfo_vnode__random_path: off
debug.fail_point.fill_kinfo_vnode__random_path: off

Note: The mount_nullfs man page does have:

QUOTE
             cache    Force enable metadata caching.

     The vfs.nullfs.cache_vnodes sysctl specifies global default for mount-
     specific cache/nocache option.
END QUOTE

That is evidence of the vintage of materials.

===
Mark Millard
marklmi at yahoo.com