K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2020-01-13T02:39:41.111475Z
K 7
svn:log
V 628
vfs: per-cpu batched requeuing of free vnodes

Constant requeuing adds significant lock contention in certain
workloads. Lessen the problem by batching it.

Per-cpu areas are locked in order to synchronize against UMA freeing
memory.

vnode's v_mflag is converted to short to prevent the struct from
growing.

Sample result from an incremental make -s -j 104 bzImage on tmpfs:
stock:   122.38s user 1780.45s system 6242% cpu 30.480 total
patched: 144.84s user 985.90s system 4856% cpu 23.282 total

Reviewed by:	jeff
Tested by:	pho (in a larger patch, previous version)
Differential Revision:	https://reviews.freebsd.org/D22998

END