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DTRACE_VFS(4) Kernel Interfaces Manual DTRACE_VFS(4) NAME dtrace_vfs -- a DTrace provider for Virtual File System SYNOPSIS vfs:fplookup:function:name vfs:namecache:function:name vfs:namei:function:name vfs:vop:function:name DESCRIPTION The DTrace vfs provider allows users to trace events in the VFS(9) layer, the kernel interface for file systems on FreeBSD. Run `dtrace -l -P vfs' to list all vfs probes. Add -v to generate pro- gram stability reports, which contain information about the number of probe arguments and their types. The fplookup module defines a single probe, vfs:fplookup:lookup:done(struct nameidata *ndp, int line, bool status_code), that instruments the fast path lookup code in VFS(9). The namecache module provides probes related to the VFS(9) cache. Con- sult the source code in src/sys/kern/vfs_cache.c for more details. The namei module manages probes related to pathname translation and lookup operations. Refer to namei(9) to learn more. The vop module contains probes related to the functions responsible for vnode(9) operations. COMPATIBILITY This provider is specific to FreeBSD. EXAMPLES Check what lookups failed to be handled in a lockless manner: # dtrace -n 'vfs:fplookup:lookup:done { @[arg1, arg2] = count(); }' SEE ALSO dtrace(1), d(7), SDT(9), namei(9), VFS(9) Brendan Gregg and Jim Mauro, DTrace: Dynamic Tracing in Oracle Solaris, Mac OS X and FreeBSD, Prentice Hall, https://www.brendangregg.com/dtracebook/, pp. 335-351, 2011. AUTHORS The FreeBSD vfs provider was written by Robert Watson <rwatson@FreeBSD.org>. This manual page was written by Mateusz Piotrowski <0mp@FreeBSD.org>. FreeBSD ports 15.quarterly November 3, 2025 DTRACE_VFS(4)
NAME | SYNOPSIS | DESCRIPTION | COMPATIBILITY | EXAMPLES | SEE ALSO | AUTHORS
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