K 10
svn:author
V 3
alc
K 8
svn:date
V 27
2015-12-18T20:58:37.918152Z
K 7
svn:log
V 954
Introduce a new mechanism for relocating pages to a different physical
address and use this mechanism when:

1. kmem_alloc_{attr,contig}() can't suitable free pages in the buddy
   allocator's free page lists.  This replaces the long-standing
   approach of laundering inactive and active pages, converting them
   into PG_CACHED pages, until there are sufficient cache/free pages
   to satisfy the allocation request.

2. on a 32-bit MIPS processor there are no free pages within the limited
   coverage of the direct map region.

Make vm_phys_alloc_contig() a little smarter (and more efficient in some
cases).  Specifically, use vm_phys_segs[] to avoid scanning free pages
lists that can't possibly contain suitable pages.

Note: vm_page_cache(), et al. are now dead code on this branch.

Reviewed by:	kib, markj
Glanced at:	jhb
Discussed with:	jeff
Sponsored by:	EMC / Isilon Storage Division
Differential Revision:	https://reviews.freebsd.org/D4444

END