Linux内核基于SCSI设备文件系统AIO读写栈

AIO同步写
#fio -ioengine=libaio -bs=4k -direct=1 -thread -rw=write -size=100M -filename=aio.tst -name=”4K write test” -iodepth=1 -runtime=10      

CPU: 21 PID: 19747 Comm: fio Not tainted 3.10.0-327.alios7.x86_64.debug #50
Hardware name: Inspur SA5212M4/YZMB-00370-102, BIOS 4.1.8 07/02/2016
ffff885e5d29c000 000000004e14ca4c ffff885e61e7bcc0 ffffffff8162a7c9
ffff885e61e7bd28 ffffffffa0173b2e ffff885e61e7bcf0 ffffffff8141789a
ffff885d1d925200 ffff885e604b6a08 ffff885e61e7bd28 ffff885e61e7bd08
Call Trace:
[<ffffffff8162a7c9>] dump_stack+0x19/0x1b
[<ffffffffa0173b2e>] _scsih_qcmd+0x4be/0x5f0 [mpt3sas]
[<ffffffff8141789a>] ? scsi_setup_cmnd+0xfa/0x180
[<ffffffff81410b3a>] scsi_dispatch_cmd+0xaa/0x230
[<ffffffff81419a61>] scsi_request_fn+0x501/0x770
[<ffffffff812bf1b3>] __blk_run_queue+0x33/0x40
[<ffffffff812bf26a>] queue_unplugged+0x2a/0xa0
[<ffffffff812c3c28>] blk_flush_plug_list+0x1d8/0x230
[<ffffffff812c4034>] blk_finish_plug+0x14/0x40
[<ffffffff81228903>] do_io_submit+0x593/0x890
[<ffffffff81228c10>] SyS_io_submit+0x10/0x20
[<ffffffff8163aec9>] system_call_fastpath+0x16/0x1b