Mateusz Guzik 7ad2f1105e vfs: store precomputed namecache hash in the vnode
This significantly speeds up path lookup, Cascade Lake doing access(2) on ufs
on /usr/obj/usr/src/amd64.amd64/sys/GENERIC/vnode_if.c, ops/s:
before: 2535298
after: 2797621

Over +10%.

The reversed order of computation here does not seem to matter for hash
distribution.

Reviewed by:	kib
Differential Revision:	https://reviews.freebsd.org/D25921
2020-08-02 20:02:06 +00:00
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