blk-mq: batching request allocation
problems
multiple queues
just begining with SQ support
how to decide if current is in ioc_batching
io context instance
how to avoid other context's interference
one active ioc batching
new request allocation from other io context
background
sched
wakeup
WQ_FLAG_EXCLUSIVE
ideas
ioc batching
single wait_state
detect queue full
check if there are waiters
test
test sequential IO on sata
set after being waken up
set for the 1st full
continue to allocate for this context only
block allocation from other contexts
how to handle during SSD flag
only done for registered queue?
why does sd_probe call two sd_revalidate_disk?
splitting IO may be interrupted by other context
done
lock
request_queue lock?