osd: why not use aio in read?

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Hi, guys:
  I'm using ceph 14 on HDD, and observed obvious high latency for
pg.lock(). Further inspection shows the root cause seems to be the
function pgbackend->objects_read_sync() called in
PrimaryLogPG::do_read() which will hold the pg lock until the disk
read finish.
  My question is why not use aio for read like what we are doing for
write in bluestore? Is there any known problem for aio read in osd?

Thanks in advance,
Xinying Song
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