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[BLOCK] Update read/write block io statistics at completion time

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Right now we do it at queueing time, which works alright for reads
(since they are usually sync), but not for async writes since we can
queue io a lot faster than we can complete it. This makes the vmstat
output look extremely bursty.

Signed-off-by: Jens Axboe <axboe@suse.de>
This commit is contained in:
Jens Axboe 2005-11-01 08:35:42 +01:00
parent d83c671fb7
commit d72d904a53
1 changed files with 11 additions and 8 deletions
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19
drivers/block/ll_rw_blk.c
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@ -2387,16 +2387,12 @@ static void drive_stat_acct(struct request *rq, int nr_sectors, int new_io)
if (!blk_fs_request(rq) || !rq->rq_disk)
return;
if (rw == READ) {
__disk_stat_add(rq->rq_disk, read_sectors, nr_sectors);
if (!new_io)
if (!new_io) {
if (rw == READ)
__disk_stat_inc(rq->rq_disk, read_merges);
} else if (rw == WRITE) {
__disk_stat_add(rq->rq_disk, write_sectors, nr_sectors);
if (!new_io)
else
__disk_stat_inc(rq->rq_disk, write_merges);
}
if (new_io) {
} else {
disk_round_stats(rq->rq_disk);
rq->rq_disk->in_flight++;
}
@ -3048,6 +3044,13 @@ static int __end_that_request_first(struct request *req, int uptodate,
(unsigned long long)req->sector);
}
if (blk_fs_request(req) && req->rq_disk) {
if (rq_data_dir(req) == READ)
__disk_stat_add(req->rq_disk, read_sectors, nr_bytes >> 9);
else
__disk_stat_add(req->rq_disk, write_sectors, nr_bytes >> 9);
}
total_bytes = bio_nbytes = 0;
while ((bio = req->bio) != NULL) {
int nbytes;