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[BLOCK] Unify the seperate read/write io stat fields into arrays

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Instead of having ->read_sectors and ->write_sectors, combine the two
into ->sectors[2] and similar for the other fields. This saves a branch
several places in the io path, since we don't have to care for what the
actual io direction is. On my x86-64 box, that's 200 bytes less text in
just the core (not counting the various drivers).

Signed-off-by: Jens Axboe <axboe@suse.de>
This commit is contained in:
Jens Axboe
2005-11-01 09:26:16 +01:00
parent d72d904a53
commit a362357b6c
12 changed files with 61 additions and 105 deletions
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12
drivers/md/raid1.c
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@@ -647,6 +647,7 @@ static int make_request(request_queue_t *q, struct bio * bio)
unsigned long flags;
struct bio_list bl;
struct page **behind_pages = NULL;
const int rw = bio_data_dir(bio);
if (unlikely(bio_barrier(bio))) {
bio_endio(bio, bio->bi_size, -EOPNOTSUPP);
@@ -665,13 +666,8 @@ static int make_request(request_queue_t *q, struct bio * bio)
conf->nr_pending++;
spin_unlock_irq(&conf->resync_lock);
if (bio_data_dir(bio)==WRITE) {
disk_stat_inc(mddev->gendisk, writes);
disk_stat_add(mddev->gendisk, write_sectors, bio_sectors(bio));
} else {
disk_stat_inc(mddev->gendisk, reads);
disk_stat_add(mddev->gendisk, read_sectors, bio_sectors(bio));
}
disk_stat_inc(mddev->gendisk, ios[rw]);
disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bio));
/*
* make_request() can abort the operation when READA is being
@@ -686,7 +682,7 @@ static int make_request(request_queue_t *q, struct bio * bio)
r1_bio->mddev = mddev;
r1_bio->sector = bio->bi_sector;
if (bio_data_dir(bio) == READ) {
if (rw == READ) {
/*
* read balancing logic:
*/