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block: inherit CPU completion on bio->rq and rq->rq merges 

Somewhat incomplete, as we do allow merges of requests and bios
that have different completion CPUs given. This is done on the
assumption that a larger IO is still more beneficial than CPU
locality.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe 2008-08-26 10:25:02 +02:00
parent c7c22e4d5c
commit ab780f1ece
3 changed files with 7 additions and 0 deletions
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4
block/blk-core.c
View File

@ -1134,6 +1134,8 @@ static int __make_request(struct request_queue *q, struct bio *bio)
req->biotail = bio;
req->nr_sectors = req->hard_nr_sectors += nr_sectors;
req->ioprio = ioprio_best(req->ioprio, prio);
if (!blk_rq_cpu_valid(req))
req->cpu = bio->bi_comp_cpu;
drive_stat_acct(req, 0);
if (!attempt_back_merge(q, req))
elv_merged_request(q, req, el_ret);
@ -1161,6 +1163,8 @@ static int __make_request(struct request_queue *q, struct bio *bio)
req->sector = req->hard_sector = bio->bi_sector;
req->nr_sectors = req->hard_nr_sectors += nr_sectors;
req->ioprio = ioprio_best(req->ioprio, prio);
if (!blk_rq_cpu_valid(req))
req->cpu = bio->bi_comp_cpu;
drive_stat_acct(req, 0);
if (!attempt_front_merge(q, req))
elv_merged_request(q, req, el_ret);

2
block/blk-merge.c
View File

@ -400,6 +400,8 @@ static int attempt_merge(struct request_queue *q, struct request *req,
}
req->ioprio = ioprio_best(req->ioprio, next->ioprio);
if (blk_rq_cpu_valid(next))
req->cpu = next->cpu;
__blk_put_request(q, next);
return 1;

1
include/linux/blkdev.h
View File

@ -545,6 +545,7 @@ enum {
#define blk_pm_request(rq) \
(blk_pm_suspend_request(rq) || blk_pm_resume_request(rq))
#define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
#define blk_sorted_rq(rq) ((rq)->cmd_flags & REQ_SORTED)
#define blk_barrier_rq(rq) ((rq)->cmd_flags & REQ_HARDBARRIER)
#define blk_fua_rq(rq) ((rq)->cmd_flags & REQ_FUA)