K 10
svn:author
V 7
asomers
K 8
svn:date
V 27
2021-04-08T21:39:01.418628Z
K 7
svn:log
V 777
Speed up geom_stats_resync in the presence of many devices

The old code had a O(n) loop, where n is the size of /dev/devstat.
Multiply that by another O(n) loop in devstat_mmap for a total of
O(n^2).

This change adds DIOCGMEDIASIZE support to /dev/devstat so userland can
quickly determine the right amount of memory to map, eliminating the
O(n) loop in userland.

This change decreases the time to run "gstat -bI0.001" with 16,384 md
devices from 29.7s to 4.2s.

Also, fix a memory leak first reported as PR 203097.

Sponsored by:	Axcient
Reviewed by:	mav, imp
Differential Revision:	https://reviews.freebsd.org/D28968

(cherry picked from commit ab63da3564e8ab0907f9d8eb565774848ffdadeb)

Git Hash:   8cfe6a4729f598d8a65d846a01184f1fabe2ebc7
Git Author: asomers@FreeBSD.org
END