diff options
Diffstat (limited to 'block')
| -rw-r--r-- | block/bfq-iosched.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c index d94838bcc135..c0b1db3afb81 100644 --- a/block/bfq-iosched.c +++ b/block/bfq-iosched.c @@ -3580,7 +3580,12 @@ static bool bfq_better_to_idle(struct bfq_queue *bfqq) * whether bfqq is being weight-raised, because * bfq_symmetric_scenario() does not take into account also * weight-raised queues (see comments on - * bfq_weights_tree_add()). + * bfq_weights_tree_add()). In particular, if bfqq is being + * weight-raised, it is important to idle only if there are + * other, non-weight-raised queues that may steal throughput + * to bfqq. Actually, we should be even more precise, and + * differentiate between interactive weight raising and + * soft real-time weight raising. * * As a side note, it is worth considering that the above * device-idling countermeasures may however fail in the @@ -3592,7 +3597,8 @@ static bool bfq_better_to_idle(struct bfq_queue *bfqq) * to let requests be served in the desired order until all * the requests already queued in the device have been served. */ - asymmetric_scenario = bfqq->wr_coeff > 1 || + asymmetric_scenario = (bfqq->wr_coeff > 1 && + bfqd->wr_busy_queues < bfqd->busy_queues) || !bfq_symmetric_scenario(bfqd); /* |