K 10
svn:author
V 5
markj
K 8
svn:date
V 27
2018-10-30T17:57:40.778283Z
K 7
svn:log
V 1302
Fix some problems that manifest when NUMA domain 0 is empty.

- In uma_prealloc(), we need to check for an empty domain before the
  first allocation attempt, not after.  Fix this by switching
  uma_prealloc() to use a vm_domainset iterator, which addresses the
  secondary issue of using a signed domain identifier in round-robin
  iteration.
- Don't automatically create a page daemon for domain 0.
- In domainset_empty_vm(), recompute ds_cnt and ds_order after
  excluding empty domains; otherwise we may frequently specify an empty
  domain when calling in to the page allocator, wasting CPU time.
  Convert DOMAINSET_PREF() policies for empty domains to round-robin.
- When freeing bootstrap pages, don't count them towards the per-domain
  total page counts for now: some vm_phys segments are created before
  the SRAT is parsed and are thus always identified as being in domain 0
  even when they are not.  Then, when bootstrap pages are freed, they
  are added to a domain that we had previously thought was empty.  Until
  this is corrected, we simply exclude them from the per-domain page
  count.

Reported and tested by:	Rajesh Kumar <rajfbsd@gmail.com>
Reviewed by:	gallatin
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D17704

END