diff options
Diffstat (limited to 'block')
| -rw-r--r-- | block/Kconfig | 2 | ||||
| -rw-r--r-- | block/blk-throttle.c | 10 | ||||
| -rw-r--r-- | block/cfq-iosched.c | 32 |
3 files changed, 38 insertions, 6 deletions
diff --git a/block/Kconfig b/block/Kconfig index 6c9213ef15a1..60be1e0455da 100644 --- a/block/Kconfig +++ b/block/Kconfig @@ -2,7 +2,7 @@ # Block layer core configuration # menuconfig BLOCK - bool "Enable the block layer" if EMBEDDED + bool "Enable the block layer" if EXPERT default y help Provide block layer support for the kernel. diff --git a/block/blk-throttle.c b/block/blk-throttle.c index 381b09bb562b..a89043a3caa4 100644 --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -168,7 +168,15 @@ static struct throtl_grp * throtl_find_alloc_tg(struct throtl_data *td, * tree of blkg (instead of traversing through hash list all * the time. */ - tg = tg_of_blkg(blkiocg_lookup_group(blkcg, key)); + + /* + * This is the common case when there are no blkio cgroups. + * Avoid lookup in this case + */ + if (blkcg == &blkio_root_cgroup) + tg = &td->root_tg; + else + tg = tg_of_blkg(blkiocg_lookup_group(blkcg, key)); /* Fill in device details for root group */ if (tg && !tg->blkg.dev && bdi->dev && dev_name(bdi->dev)) { diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index 8427697c5437..7be4c7959625 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -598,8 +598,8 @@ cfq_group_slice(struct cfq_data *cfqd, struct cfq_group *cfqg) return cfq_target_latency * cfqg->weight / st->total_weight; } -static inline void -cfq_set_prio_slice(struct cfq_data *cfqd, struct cfq_queue *cfqq) +static inline unsigned +cfq_scaled_cfqq_slice(struct cfq_data *cfqd, struct cfq_queue *cfqq) { unsigned slice = cfq_prio_to_slice(cfqd, cfqq); if (cfqd->cfq_latency) { @@ -625,6 +625,14 @@ cfq_set_prio_slice(struct cfq_data *cfqd, struct cfq_queue *cfqq) low_slice); } } + return slice; +} + +static inline void +cfq_set_prio_slice(struct cfq_data *cfqd, struct cfq_queue *cfqq) +{ + unsigned slice = cfq_scaled_cfqq_slice(cfqd, cfqq); + cfqq->slice_start = jiffies; cfqq->slice_end = jiffies + slice; cfqq->allocated_slice = slice; @@ -1661,8 +1669,11 @@ __cfq_slice_expired(struct cfq_data *cfqd, struct cfq_queue *cfqq, /* * store what was left of this slice, if the queue idled/timed out */ - if (timed_out && !cfq_cfqq_slice_new(cfqq)) { - cfqq->slice_resid = cfqq->slice_end - jiffies; + if (timed_out) { + if (cfq_cfqq_slice_new(cfqq)) + cfqq->slice_resid = cfq_scaled_cfqq_slice(cfqd, cfqq); + else + cfqq->slice_resid = cfqq->slice_end - jiffies; cfq_log_cfqq(cfqd, cfqq, "resid=%ld", cfqq->slice_resid); } @@ -3284,10 +3295,19 @@ cfq_should_preempt(struct cfq_data *cfqd, struct cfq_queue *new_cfqq, */ static void cfq_preempt_queue(struct cfq_data *cfqd, struct cfq_queue *cfqq) { + struct cfq_queue *old_cfqq = cfqd->active_queue; + cfq_log_cfqq(cfqd, cfqq, "preempt"); cfq_slice_expired(cfqd, 1); /* + * workload type is changed, don't save slice, otherwise preempt + * doesn't happen + */ + if (cfqq_type(old_cfqq) != cfqq_type(cfqq)) + cfqq->cfqg->saved_workload_slice = 0; + + /* * Put the new queue at the front of the of the current list, * so we know that it will be selected next. */ @@ -3412,6 +3432,10 @@ static bool cfq_should_wait_busy(struct cfq_data *cfqd, struct cfq_queue *cfqq) { struct cfq_io_context *cic = cfqd->active_cic; + /* If the queue already has requests, don't wait */ + if (!RB_EMPTY_ROOT(&cfqq->sort_list)) + return false; + /* If there are other queues in the group, don't wait */ if (cfqq->cfqg->nr_cfqq > 1) return false; |