diff options
| author | Lars Ellenberg <lars@linbit.com> | 2007-03-26 23:41:58 +0200 |
|---|---|---|
| committer | Adrian Bunk <bunk@stusta.de> | 2007-03-26 23:41:58 +0200 |
| commit | 6b9720b5aca01aba1fb9403f1b75bb26689223a1 (patch) | |
| tree | 0a63dc62beb82fb26d71144edb6ab57ef6331c0c /drivers/md/raid10.c | |
| parent | c920d11e0b9a2c894b99cf9a95cbd83f53c533eb (diff) | |
md: pass down BIO_RW_SYNC in raid{1,10}
md raidX make_request functions strip off the BIO_RW_SYNC flag, thus
introducing additional latency.
Fixing this in raid1 and raid10 seems to be straightforward enough.
For our particular usage case in DRBD, passing this flag improved some
initialization time from ~5 minutes to ~5 seconds.
Signed-off-by: Lars Ellenberg <lars@linbit.com>
Acked-by: NeilBrown <neilb@suse.de>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Diffstat (limited to 'drivers/md/raid10.c')
| -rw-r--r-- | drivers/md/raid10.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index 039ed49b3c03..0a11d5c20b5b 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -748,6 +748,7 @@ static int make_request(request_queue_t *q, struct bio * bio) int i; int chunk_sects = conf->chunk_mask + 1; const int rw = bio_data_dir(bio); + const int do_sync = bio_sync(bio); struct bio_list bl; unsigned long flags; @@ -829,7 +830,7 @@ static int make_request(request_queue_t *q, struct bio * bio) mirror->rdev->data_offset; read_bio->bi_bdev = mirror->rdev->bdev; read_bio->bi_end_io = raid10_end_read_request; - read_bio->bi_rw = READ; + read_bio->bi_rw = READ | do_sync; read_bio->bi_private = r10_bio; generic_make_request(read_bio); @@ -875,7 +876,7 @@ static int make_request(request_queue_t *q, struct bio * bio) conf->mirrors[d].rdev->data_offset; mbio->bi_bdev = conf->mirrors[d].rdev->bdev; mbio->bi_end_io = raid10_end_write_request; - mbio->bi_rw = WRITE; + mbio->bi_rw = WRITE | do_sync; mbio->bi_private = r10_bio; atomic_inc(&r10_bio->remaining); @@ -888,6 +889,9 @@ static int make_request(request_queue_t *q, struct bio * bio) blk_plug_device(mddev->queue); spin_unlock_irqrestore(&conf->device_lock, flags); + if (do_sync) + md_wakeup_thread(mddev->thread); + return 0; } @@ -1488,6 +1492,7 @@ static void raid10d(mddev_t *mddev) (unsigned long long)r10_bio->sector); raid_end_bio_io(r10_bio); } else { + const int do_sync = bio_sync(r10_bio->master_bio); rdev = conf->mirrors[mirror].rdev; if (printk_ratelimit()) printk(KERN_ERR "raid10: %s: redirecting sector %llu to" @@ -1499,7 +1504,7 @@ static void raid10d(mddev_t *mddev) bio->bi_sector = r10_bio->devs[r10_bio->read_slot].addr + rdev->data_offset; bio->bi_bdev = rdev->bdev; - bio->bi_rw = READ; + bio->bi_rw = READ | do_sync; bio->bi_private = r10_bio; bio->bi_end_io = raid10_end_read_request; unplug = 1; |