[BLOCK] Unify the seperate read/write io stat fields into arrays
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>
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 0e1f148..e16f473 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -647,6 +647,7 @@
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 @@
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 @@
r1_bio->mddev = mddev;
r1_bio->sector = bio->bi_sector;
- if (bio_data_dir(bio) == READ) {
+ if (rw == READ) {
/*
* read balancing logic:
*/
