tree 8a538bd4decbbe556c585455efd9ea5daf33bfa9
parent 581dbd94da80c845b28666716e30c22c0834756a
author NeilBrown <neilb@suse.com> 1479101421 +1100
committer Shaohua Li <shli@fb.com> 1479490537 -0800

md/raid1, raid10: add blktrace records when IO is delayed

Both raid1 and raid10 will sometimes delay handling an IO request,
such as when resync is happening or there are too many requests queued.

Add some blktrace messsages so we can see when that is happening when
looking for performance artefacts.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>