K 10
svn:author
V 5
markj
K 8
svn:date
V 27
2020-09-02T19:59:25.542883Z
K 7
svn:log
V 436
Avoid unnecessary object locking in vm_page_grab_pages_unlocked().

We were needlessly acquiring the object lock to call
vm_page_grab_pages() even when all of the requested pages were looked up
locklessly.  Fix that, stop testing for count == 0 in
vm_page_grab_pages(), and add assertions to help catch this kind of
mistake.

Reported by:	cem
Reviewed by:	alc, cem, dougm, jeff
Differential Revision:	https://reviews.freebsd.org/D26304

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