diff options
Diffstat (limited to 'block/blk-cgroup.c')
| -rw-r--r-- | block/blk-cgroup.c | 54 |
1 files changed, 27 insertions, 27 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index aa97cd4..80c1261 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -219,6 +219,33 @@ void blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg) } EXPORT_SYMBOL_GPL(blkiocg_update_avg_queue_size_stats); +void blkiocg_set_start_empty_time(struct blkio_group *blkg, bool ignore) +{ + unsigned long flags; + struct blkio_group_stats *stats; + + spin_lock_irqsave(&blkg->stats_lock, flags); + stats = &blkg->stats; + + if (stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_READ] || + stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_WRITE]) { + spin_unlock_irqrestore(&blkg->stats_lock, flags); + return; + } + + /* + * If ignore is set, we do not panic on the empty flag being set + * already. This is to avoid cases where there are superfluous timeslice + * complete events (for eg., forced_dispatch in CFQ) when no IOs are + * served which could result in triggering the empty check incorrectly. + */ + BUG_ON(!ignore && blkio_blkg_empty(stats)); + stats->start_empty_time = sched_clock(); + blkio_mark_blkg_empty(stats); + spin_unlock_irqrestore(&blkg->stats_lock, flags); +} +EXPORT_SYMBOL_GPL(blkiocg_set_start_empty_time); + void blkiocg_update_dequeue_stats(struct blkio_group *blkg, unsigned long dequeue) { @@ -268,33 +295,6 @@ void blkiocg_update_timeslice_used(struct blkio_group *blkg, unsigned long time) } EXPORT_SYMBOL_GPL(blkiocg_update_timeslice_used); -void blkiocg_set_start_empty_time(struct blkio_group *blkg, bool ignore) -{ - unsigned long flags; - struct blkio_group_stats *stats; - - spin_lock_irqsave(&blkg->stats_lock, flags); - stats = &blkg->stats; - - if (stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_READ] || - stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_WRITE]) { - spin_unlock_irqrestore(&blkg->stats_lock, flags); - return; - } - - /* - * If ignore is set, we do not panic on the empty flag being set - * already. This is to avoid cases where there are superfluous timeslice - * complete events (for eg., forced_dispatch in CFQ) when no IOs are - * served which could result in triggering the empty check incorrectly. - */ - BUG_ON(!ignore && blkio_blkg_empty(stats)); - stats->start_empty_time = sched_clock(); - blkio_mark_blkg_empty(stats); - spin_unlock_irqrestore(&blkg->stats_lock, flags); -} -EXPORT_SYMBOL_GPL(blkiocg_set_start_empty_time); - void blkiocg_update_dispatch_stats(struct blkio_group *blkg, uint64_t bytes, bool direction, bool sync) { |
