K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2020-02-15T13:00:39.046705Z
K 7
svn:log
V 481
vfs: make write suspension mandatory

At the time opt-in was introduced adding yourself as a writer was esrializing
across the mount point. Nowadays it is fully per-cpu, the only impact being
a small single-threaded hit on top of what's there right now.

Vast majority of the overhead stems from the call to VOP_GETWRITEMOUNT which
has is done regardless.

Should someone want to microoptimize this single-threaded they can coalesce
looking the mount up with adding a write to it.

END