diff options
| author | Vivek Goyal <vgoyal@redhat.com> | 2010-09-15 17:06:35 -0400 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2010-09-16 08:42:52 +0200 |
| commit | e43473b7f223ec866f7db273697e76c337c390f9 (patch) | |
| tree | e90b52dbe4ec4ae37263a00e2bd9eaf5367cf72f /block/blk-core.c | |
| parent | 4c9eefa16c6f124ffcc736cb719b24ea27f85017 (diff) | |
| download | lwn-e43473b7f223ec866f7db273697e76c337c390f9.tar.gz lwn-e43473b7f223ec866f7db273697e76c337c390f9.zip | |
blkio: Core implementation of throttle policy
o Actual implementation of throttling policy in block layer. Currently it
implements READ and WRITE bytes per second throttling logic. IOPS throttling
comes in later patches.
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'block/blk-core.c')
| -rw-r--r-- | block/blk-core.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index 8d07c1b7e701..797d5095eb83 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -382,6 +382,7 @@ void blk_sync_queue(struct request_queue *q) del_timer_sync(&q->unplug_timer); del_timer_sync(&q->timeout); cancel_work_sync(&q->unplug_work); + throtl_shutdown_timer_wq(q); } EXPORT_SYMBOL(blk_sync_queue); @@ -459,6 +460,8 @@ void blk_cleanup_queue(struct request_queue *q) if (q->elevator) elevator_exit(q->elevator); + blk_throtl_exit(q); + blk_put_queue(q); } EXPORT_SYMBOL(blk_cleanup_queue); @@ -515,6 +518,11 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id) return NULL; } + if (blk_throtl_init(q)) { + kmem_cache_free(blk_requestq_cachep, q); + return NULL; + } + setup_timer(&q->backing_dev_info.laptop_mode_wb_timer, laptop_mode_timer_fn, (unsigned long) q); init_timer(&q->unplug_timer); @@ -1522,6 +1530,15 @@ static inline void __generic_make_request(struct bio *bio) goto end_io; } + blk_throtl_bio(q, &bio); + + /* + * If bio = NULL, bio has been throttled and will be submitted + * later. + */ + if (!bio) + break; + trace_block_bio_queue(q, bio); ret = q->make_request_fn(q, bio); @@ -2580,6 +2597,13 @@ int kblockd_schedule_work(struct request_queue *q, struct work_struct *work) } EXPORT_SYMBOL(kblockd_schedule_work); +int kblockd_schedule_delayed_work(struct request_queue *q, + struct delayed_work *dwork, unsigned long delay) +{ + return queue_delayed_work(kblockd_workqueue, dwork, delay); +} +EXPORT_SYMBOL(kblockd_schedule_delayed_work); + int __init blk_dev_init(void) { BUILD_BUG_ON(__REQ_NR_BITS > 8 * |