On Sat, 30 Dec 2017 23:32:04 +0300 Timofey Titovets <nefelim4ag@xxxxxxxxx> wrote: > Currently btrfs raid1/10 balancer balance requests to mirrors, > based on pid % num of mirrors. > > Make logic understood: > - if one of underline devices are non rotational > - Queue leght to underline devices > > By default try use pid % num_mirrors guessing, but: > - If one of mirrors are non rotational, repick optimal to it > - If underline mirror have less queue leght then optimal, > repick to that mirror > > For avoid round-robin request balancing, > lets round down queue leght: > - By 8 for rotational devs > - By 2 for all non rotational devs > > Changes: > v1 -> v2: > - Use helper part_in_flight() from genhd.c > to get queue lenght > - Move guess code to guess_optimal() > - Change balancer logic, try use pid % mirror by default > Make balancing on spinning rust if one of underline devices > are overloaded > v2 -> v3: > - Fix arg for RAID10 - use sub_stripes, instead of num_stripes > > Signed-off-by: Timofey Titovets <nefelim4ag@xxxxxxxxx> Reviewed-by: Dmitrii Tcvetkov <demfloro@xxxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
