markj dfb4f0694a Avoid page lookups in the top-level object in vm_object_madvise().
We can iterate over consecutive resident pages in the top-level object
using the object's page list rather than by performing lookups in the
object radix tree. This extends one of the optimizations in r312208 to the
case where a shadow chain is present.

Suggested by:	alc
Reviewed by:	alc, kib (previous version)
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D9282
2017-01-30 18:51:43 +00:00
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