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Commit 3102b0a5 authored by Ilya Dryomov's avatar Ilya Dryomov
Browse files

crush: add note about r in recursive choose 



Reflects ceph.git commit 4551fee9ad89d0427ed865d766d0d44004d3e3e1.

Signed-off-by: default avatarIlya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: default avatarSage Weil <sage@inktank.com>
parent 9a3b490a

net/ceph/crush/mapper.c

+8 −0
Original line number Diff line number Diff line
@@ -514,6 +514,14 @@ static void crush_choose_indep(const struct crush_map *map, 


			/* choose through intervening buckets */

			for (;;) {

				/* note: we base the choice on the position

				 * even in the nested call.  that means that

				 * if the first layer chooses the same bucket

				 * in a different position, we will tend to

				 * choose a different item in that bucket.

				 * this will involve more devices in data

				 * movement and tend to distribute the load.

				 */

				r = rep;



				/* be careful */