Konstantin Belousov 484e9d0322 Make anon clustering more compatible.
Make the clustering enabling knob more fine-grained by providing a
setting where the allocation with hint is not clustered. This is aimed
to be somewhat more compatible with e.g. go 1.4 which expects that
hinted mmap without MAP_FIXED does not change the allocation address.

Now the vm.cluster_anon can be set to 1 to only cluster when no hints,
and to 2 to always cluster.  Default value is 1.

Requested by: peter
Reviewed by:	emaste, markj
Sponsored by:	The FreeBSD Foundation
MFC after:	1 month
Differential revision:	https://reviews.freebsd.org/D19194
2019-02-14 15:45:53 +00:00
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