[Bug 188911] [kern] sysctl(KERN_PROC_VMMAP) takes too long

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=188911

--- Comment #7 from commit-hook at freebsd.org ---
A commit references this bug:

Author: kib
Date: Wed Jul  9 19:11:57 UTC 2014
New revision: 268466
URL: http://svnweb.freebsd.org/changeset/base/268466

Log:
  Current code in sysctl proc.vmmap, which intent is to calculate the
  amount of resident pages, in fact calculates the amount of installed
  pte entries in the region.  Resident pages which were not soft-faulted
  yet are not counted.

  Calculate the amount of resident pages by looking in the objects chain
  backing the region.

  Add a knob to disable the residency calculation at all.  For large
  sparce regions, either previous or updated algorithm runs for too long
  time, while several introspection tools do not need the (advisory) RSS
  value at all.

  PR:    kern/188911
  Sponsored by:    The FreeBSD Foundation
  MFC after:    1 week

Changes:
  head/sys/kern/kern_proc.c

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