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drbd: account bitmap IO during resync as resync-(related-)-io 

If we have a good resync rate, we will frequently update the on-disk
bitmap, which, if not accounted for as resync io, may let an otherwise
idle device appear to be "busy", and cause us to throttle resync.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Lars Ellenberg 2011-06-14 14:18:23 +02:00 committed by Philipp Reisner
parent 8ccee20e3e
commit 5a8b424276
1 changed files with 3 additions and 0 deletions
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3
drivers/block/drbd/drbd_bitmap.c
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@ -991,6 +991,9 @@ static void bm_page_io_async(struct bm_aio_ctx *ctx, int page_nr, int rw) __must
bio_endio(bio, -EIO);
} else {
submit_bio(rw, bio);
/* this should not count as user activity and cause the
* resync to throttle -- see drbd_rs_should_slow_down(). */
atomic_add(len >> 9, &mdev->rs_sect_ev);
}
}