K 10
svn:author
V 5
markj
K 8
svn:date
V 27
2019-08-21T16:11:12.779838Z
K 7
svn:log
V 792
Simplify vm_page_dequeue() and fix an assertion.

- Add a vm_pagequeue_remove() function to physically remove a page
  from its queue and update the queue length.
- Remove vm_page_pagequeue_lockptr() and let vm_page_pagequeue()
  return NULL for dequeued pages.
- Avoid unnecessarily reloading the queue index if vm_page_dequeue()
  loses a race with a concurrent queue operation.
- Correct an always-true assertion: vm_page_dequeue() may be called
  from the page allocator with the page unlocked.  The assertion
  m->order == VM_NFREEORDER simply tests whether the page has been
  removed from the vm_phys free lists; instead, check whether the
  page belongs to an object.

Reviewed by:	kib
MFC after:	1 week
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D21341

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