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| author | Jens Axboe <jens.axboe@oracle.com> | 2008-08-26 10:25:02 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2008-10-09 08:56:09 +0200 |
| commit | ab780f1ece0dc8d5e8e8e85435acc5e4747ccda3 (patch) | |
| tree | 4085b6c929a44de229eb5ef13fa2079211ea5512 | |
| parent | c7c22e4d5c1fdebfac4dba76de7d0338c2b0d832 (diff) | |
| download | lwn-ab780f1ece0dc8d5e8e8e85435acc5e4747ccda3.tar.gz lwn-ab780f1ece0dc8d5e8e8e85435acc5e4747ccda3.zip | |
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>
| -rw-r--r-- | block/blk-core.c | 4 | ||||
| -rw-r--r-- | block/blk-merge.c | 2 | ||||
| -rw-r--r-- | include/linux/blkdev.h | 1 |
3 files changed, 7 insertions, 0 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index 5484838f46e7..b9a252cae4df 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -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); diff --git a/block/blk-merge.c b/block/blk-merge.c index c77196d55899..908d3e11ac52 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -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; diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 93204bf7b297..12df8efeef19 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -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) |