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block: immediately dispatch big size request 

Currently block plug holds up to 16 non-mergeable requests. This makes
sense if the request size is small, eg, reduce lock contention. But if
request size is big enough, we don't need to worry about lock
contention. Holding such request makes no sense and it lows the disk
utilization.

In practice, this improves 10% throughput for my raid5 sequential write
workload.

The size (128k) is arbitrary right now, but it makes sure lock
contention is small. This probably could be more intelligent, eg, check
average request size holded. Since this is mainly for sequential IO,
probably not worthy.

V2: check the last request instead of the first request, so as long as
there is one big size request we flush the plug.

Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Shaohua Li 2016-11-03 17:03:53 -07:00 committed by Jens Axboe
parent 46f3cc1762
commit 50d24c3440
2 changed files with 4 additions and 1 deletions
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4
block/blk-core.c
View File

@ -1746,7 +1746,9 @@ static blk_qc_t blk_queue_bio(struct request_queue *q, struct bio *bio)
if (!request_count)
trace_block_plug(q);
else {
if (request_count >= BLK_MAX_REQUEST_COUNT) {
struct request *last = list_entry_rq(plug->list.prev);
if (request_count >= BLK_MAX_REQUEST_COUNT ||
blk_rq_bytes(last) >= BLK_PLUG_FLUSH_SIZE) {
blk_flush_plug_list(plug, false);
trace_block_plug(q);
}

1
include/linux/blkdev.h
View File

@ -1173,6 +1173,7 @@ struct blk_plug {
struct list_head cb_list; /* md requires an unplug callback */
};
#define BLK_MAX_REQUEST_COUNT 16
#define BLK_PLUG_FLUSH_SIZE (128 * 1024)
struct blk_plug_cb;
typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);