Linux内核基于SCSI设备文件系统读写栈

同步写
#fio -bs=4k -direct=1 -thread -rw=write -size=1G -filename=ssd.tst -name=”sdx” -iodepth=1 -runtime=10
[10940.221722] CPU: 0 PID: 128839 Comm: fio Not tainted 3.10.0-327.alios7.x86_64.debug #50
[10940.221723] Hardware name: Inspur SA5212M4/YZMB-00370-102, BIOS 4.1.8 07/02/2016
[10940.221726] ffff885e604a5f80 00000000d98c9343 ffff885d23ad7790 ffffffff8162a7c9
[10940.221729] ffff885d23ad77f8 ffffffffa0173b2e ffff885d23ad77c0 ffffffff8141789a
[10940.221732] ffff885e5829c300 ffff885e604b6a08 ffff885d23ad77f8 ffff885d23ad77d8
[10940.221733] Call Trace:
[10940.221735] [<ffffffff8162a7c9>] dump_stack+0x19/0x1b
[10940.221739] [<ffffffffa0173b2e>] _scsih_qcmd+0x4be/0x5f0 [mpt3sas]
[10940.221742] [<ffffffff8141789a>] ? scsi_setup_cmnd+0xfa/0x180
[10940.221743] [<ffffffff81410b3a>] scsi_dispatch_cmd+0xaa/0x230
[10940.221745] [<ffffffff81419a61>] scsi_request_fn+0x501/0x770
[10940.221748] [<ffffffff812bf1b3>] __blk_run_queue+0x33/0x40
[10940.221750] [<ffffffff812bf26a>] queue_unplugged+0x2a/0xa0
[10940.221752] [<ffffffff812c3c28>] blk_flush_plug_list+0x1d8/0x230
[10940.221754] [<ffffffff8162f598>] io_schedule_timeout+0x128/0x130
[10940.221755] [<ffffffff8162f5b8>] io_schedule+0x18/0x20
[10940.221757] [<ffffffff81215dc3>] do_blockdev_direct_IO+0xc03/0x2610
[10940.221760] [<ffffffffa0108144>] ? jbd2_journal_dirty_metadata+0xd4/0x260 [jbd2]
[10940.221766] [<ffffffffa02906a0>] ? ext4_block_zero_page_range+0x3c0/0x3c0 [ext4]
[10940.221768] [<ffffffff81217825>] __blockdev_direct_IO+0x55/0x60
[10940.221773] [<ffffffffa02906a0>] ? ext4_block_zero_page_range+0x3c0/0x3c0 [ext4]
[10940.221777] [<ffffffffa028d840>] ? do_journal_get_write_access+0xa0/0xa0 [ext4]
[10940.221782] [<ffffffffa028f6eb>] ext4_direct_IO+0x2fb/0x560 [ext4]
[10940.221787] [<ffffffffa02906a0>] ? ext4_block_zero_page_range+0x3c0/0x3c0 [ext4]
[10940.221792] [<ffffffffa028d840>] ? do_journal_get_write_access+0xa0/0xa0 [ext4]
[10940.221793] [<ffffffff81163b4d>] generic_file_direct_write+0xcd/0x190
[10940.221795] [<ffffffff81163f2c>] __generic_file_aio_write+0x31c/0x3e0
[10940.221800] [<ffffffffa0289d5c>] ext4_file_write+0x2ac/0x460 [ext4]
[10940.221802] [<ffffffff812f7114>] ? vsnprintf+0x234/0x6a0
[10940.221805] [<ffffffff811d6afd>] do_sync_write+0x8d/0xd0
[10940.221807] [<ffffffff811d7358>] vfs_write+0xf8/0x320
[10940.221809] [<ffffffff811d80b2>] SyS_pwrite64+0x92/0xc0
[10940.221810] [<ffffffff8163aec9>] system_call_fastpath+0x16/0x1b

[11206.290464] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.10.0-327.alios7.x86_64.debug #50
[11206.291033] Hardware name: Inspur SA5212M4/YZMB-00370-102, BIOS 4.1.8 07/02/2016
[11206.291550] ffff885e604a6300 5b075734d9beb213 ffff885efee03bb8 ffffffff8162a7c9
[11206.292077] ffff885efee03c20 ffffffffa0173b2e ffffea01748ed980 ffff885d23b66b00
[11206.292608] ffffea0174e1fdc0 ffff885d387f7d80 ffff885efe803900 ffff885efee03c00
[11206.293142] Call Trace:
[11206.293660] <IRQ> [<ffffffff8162a7c9>] dump_stack+0x19/0x1b
[11206.294205] [<ffffffffa0173b2e>] _scsih_qcmd+0x4be/0x5f0 [mpt3sas]
[11206.294747] [<ffffffff81410b3a>] scsi_dispatch_cmd+0xaa/0x230
[11206.295291] [<ffffffff81419a61>] scsi_request_fn+0x501/0x770
[11206.295829] [<ffffffff812bf1b3>] __blk_run_queue+0x33/0x40
[11206.296370] [<ffffffff812bf226>] blk_run_queue+0x26/0x40
[11206.296898] [<ffffffff81417e88>] scsi_run_queue+0x258/0x2f0
[11206.297417] [<ffffffff81419d10>] scsi_next_command+0x20/0x40
[11206.297927] [<ffffffff81419e85>] scsi_end_request+0x155/0x1d0
[11206.298431] [<ffffffff8141a063>] scsi_io_completion+0x103/0x600
[11206.298936] [<ffffffffa0164530>] ? mpt3sas_base_free_smid+0x120/0x240 [mpt3sas]
[11206.299438] [<ffffffff8140f405>] scsi_finish_command+0xd5/0x130
[11206.299938] [<ffffffff8141953a>] scsi_softirq_done+0x12a/0x150
[11206.300431] [<ffffffff812c95c0>] blk_done_softirq+0x90/0xc0
[11206.300921] [<ffffffff8107dfef>] __do_softirq+0xef/0x280
[11206.301413] [<ffffffff8163c7dc>] call_softirq+0x1c/0x30
[11206.301901] [<ffffffff81016fc5>] do_softirq+0x65/0xa0
[11206.302389] [<ffffffff8107e385>] irq_exit+0x115/0x120
[11206.302873] [<ffffffff8163d378>] do_IRQ+0x58/0xf0
[11206.303358] [<ffffffff816326ad>] common_interrupt+0x6d/0x6d
[11206.303845] <EOI> [<ffffffff81058e96>] ? native_safe_halt+0x6/0x10
[11206.304347] [<ffffffff8101dbcf>] default_idle+0x1f/0xc0
[11206.304841] [<ffffffff8101e4d6>] arch_cpu_idle+0x26/0x30
[11206.305331] [<ffffffff810cf305>] cpu_startup_entry+0x245/0x290
[11206.305822] [<ffffffff8161a4e7>] rest_init+0x77/0x80
[11206.306309] [<ffffffff81a80057>] start_kernel+0x429/0x44a
[11206.306799] [<ffffffff81a7fa37>] ? repair_env_string+0x5c/0x5c

CPU: 18 PID: 13016 Comm: jbd2/sdf1-8 Not tainted 3.10.0-327.alios7.x86_64.debug #55
Hardware name: Inspur SA5212M4/YZMB-00370-102, BIOS 4.1.8 07/02/2016
ffff885e570124c0 00000000fef782f8 ffff885e65d6bae0 ffffffff8162a7a9
ffff885e65d6bb48 ffffffffa0061b26 ffff885e65d6bb10 ffffffff8141787a
ffff885e57008c00 ffff885e5b956a08 ffff885e65d6bb48 ffff885e65d6bb28
Call Trace:
[<ffffffff8162a7a9>] dump_stack+0x19/0x1b
[<ffffffffa0061b26>] _scsih_qcmd+0x4b6/0x5e0 [mpt3sas]
[<ffffffff8141787a>] ? scsi_setup_cmnd+0xfa/0x180
[<ffffffff81410b1a>] scsi_dispatch_cmd+0xaa/0x230
[<ffffffff81419a41>] scsi_request_fn+0x501/0x770
[<ffffffff812bf193>] __blk_run_queue+0x33/0x40
[<ffffffff812bf24a>] queue_unplugged+0x2a/0xa0
[<ffffffff812c3c08>] blk_flush_plug_list+0x1d8/0x230
[<ffffffff812c4014>] blk_finish_plug+0x14/0x40
[<ffffffffa0152d1b>] jbd2_journal_commit_transaction+0xe4b/0x19a0 [jbd2]
[<ffffffff81013588>] ? __switch_to+0xf8/0x4b0
[<ffffffffa0157d79>] kjournald2+0xc9/0x260 [jbd2]
[<ffffffff8109fb00>] ? wake_up_atomic_t+0x30/0x30
[<ffffffffa0157cb0>] ? commit_timeout+0x10/0x10 [jbd2]
[<ffffffff8109eb0f>] kthread+0xcf/0xe0
[<ffffffff8109ea40>] ? kthread_create_on_node+0x140/0x140
[<ffffffff8163ae18>] ret_from_fork+0x58/0x90
[<ffffffff8109ea40>] ? kthread_create_on_node+0x140/0x140

异步写
#fio -bs=4k -direct=0 -thread -rw=write -size=1G -filename=sdf -name=”sdx” -iodepth=1 -runtime=10
[11205.694810] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.10.0-327.alios7.x86_64.debug #50
[11205.695378] Hardware name: Inspur SA5212M4/YZMB-00370-102, BIOS 4.1.8 07/02/2016
[11205.695894] ffff885e604a4a80 5b075734d9beb213 ffff885efee03bb8 ffffffff8162a7c9
[11205.696421] ffff885efee03c20 ffffffffa0173b2e ffffea0178bec480 ffff885e2fb13500
[11205.696951] ffffea0174e1fdc0 ffff885d387f7380 ffff885efe803900 ffff885efee03c00
[11205.697484] Call Trace:
[11205.698001] <IRQ> [<ffffffff8162a7c9>] dump_stack+0x19/0x1b
[11205.698546] [<ffffffffa0173b2e>] _scsih_qcmd+0x4be/0x5f0 [mpt3sas]
[11205.699087] [<ffffffff81410b3a>] scsi_dispatch_cmd+0xaa/0x230
[11205.699629] [<ffffffff81419a61>] scsi_request_fn+0x501/0x770
[11205.700165] [<ffffffff812bf1b3>] __blk_run_queue+0x33/0x40
[11205.700705] [<ffffffff812bf226>] blk_run_queue+0x26/0x40
[11205.701233] [<ffffffff81417e88>] scsi_run_queue+0x258/0x2f0
[11205.701750] [<ffffffff81419d10>] scsi_next_command+0x20/0x40
[11205.702259] [<ffffffff81419e85>] scsi_end_request+0x155/0x1d0
[11205.702762] [<ffffffff8141a063>] scsi_io_completion+0x103/0x600
[11205.703267] [<ffffffffa0164530>] ? mpt3sas_base_free_smid+0x120/0x240 [mpt3sas]
[11205.703767] [<ffffffff8140f405>] scsi_finish_command+0xd5/0x130
[11205.704266] [<ffffffff8141953a>] scsi_softirq_done+0x12a/0x150
[11205.704758] [<ffffffff812c95c0>] blk_done_softirq+0x90/0xc0
[11205.705247] [<ffffffff8107dfef>] __do_softirq+0xef/0x280
[11205.705738] [<ffffffff8163c7dc>] call_softirq+0x1c/0x30
[11205.706225] [<ffffffff81016fc5>] do_softirq+0x65/0xa0
[11205.706711] [<ffffffff8107e385>] irq_exit+0x115/0x120
[11205.707196] [<ffffffff8163d378>] do_IRQ+0x58/0xf0
[11205.707678] [<ffffffff816326ad>] common_interrupt+0x6d/0x6d
[11205.708163] <EOI> [<ffffffff81058e96>] ? native_safe_halt+0x6/0x10
[11205.708663] [<ffffffff8101dbcf>] default_idle+0x1f/0xc0
[11205.709155] [<ffffffff8101e4d6>] arch_cpu_idle+0x26/0x30
[11205.709642] [<ffffffff810cf305>] cpu_startup_entry+0x245/0x290
[11205.710130] [<ffffffff8161a4e7>] rest_init+0x77/0x80
[11205.710619] [<ffffffff81a80057>] start_kernel+0x429/0x44a
[11205.711106] [<ffffffff81a7fa37>] ? repair_env_string+0x5c/0x5c
[11205.711599] [<ffffffff81a7f120>] ? early_idt_handlers+0x120/0x120
[11205.712094] [<ffffffff81a7f5ee>] x86_64_start_reservations+0x2a/0x2c
[11205.712594] [<ffffffff81a7f742>] x86_64_start_kernel+0x152/0x175

异步读
#fio -bs=4k -direct=0 -thread -rw=read -size=1G -filename=sdf -name=”sdx” -iodepth=1 -runtime=100
[11772.539062] CPU: 18 PID: 13820 Comm: fio Not tainted 3.10.0-327.alios7.x86_64.debug #50
[11772.539595] Hardware name: Inspur SA5212M4/YZMB-00370-102, BIOS 4.1.8 07/02/2016
[11772.540112] ffff885e5821ad80 000000002c352cdc ffff885d2cb6ba50 ffffffff8162a7c9
[11772.540651] ffff885d2cb6bab8 ffffffffa0173b2e ffff885d2cb6ba80 ffffffff8141789a
[11772.541185] ffff885d2a4e9200 ffff885e604b6a08 ffff885d2cb6bab8 ffff885d2cb6ba98
[11772.541712] Call Trace:
[11772.542225] [<ffffffff8162a7c9>] dump_stack+0x19/0x1b
[11772.542751] [<ffffffffa0173b2e>] _scsih_qcmd+0x4be/0x5f0 [mpt3sas]
[11772.543278] [<ffffffff8141789a>] ? scsi_setup_cmnd+0xfa/0x180
[11772.543804] [<ffffffff81410b3a>] scsi_dispatch_cmd+0xaa/0x230
[11772.544333] [<ffffffff81419a61>] scsi_request_fn+0x501/0x770
[11772.544856] [<ffffffff812bf1b3>] __blk_run_queue+0x33/0x40
[11772.545386] [<ffffffff812bf26a>] queue_unplugged+0x2a/0xa0
[11772.545908] [<ffffffff812c3c28>] blk_flush_plug_list+0x1d8/0x230
[11772.546438] [<ffffffff812c4034>] blk_finish_plug+0x14/0x40
[11772.546955] [<ffffffff8116e83e>] __do_page_cache_readahead+0x1de/0x250
[11772.547481] [<ffffffff8116ea36>] ondemand_readahead+0x126/0x240
[11772.548004] [<ffffffff8116ebd0>] page_cache_async_readahead+0x80/0xa0
[11772.548534] [<ffffffff811616be>] ? __find_get_page+0x1e/0xa0
[11772.549053] [<ffffffff81163870>] generic_file_aio_read+0x540/0x750
[11772.549581] [<ffffffff811d6a2d>] do_sync_read+0x8d/0xd0
[11772.550105] [<ffffffff811d718c>] vfs_read+0x9c/0x170
[11772.550630] [<ffffffff811d7ff2>] SyS_pread64+0x92/0xc0
[11772.551155] [<ffffffff8163aec9>] system_call_fastpath+0x16/0x1b

同步读
#fio -bs=4k -direct=1 -thread -rw=read -size=1G -filename=sdf -name=”sdx” -iodepth=1 -runtime=100
[11982.353568] CPU: 31 PID: 16183 Comm: fio Not tainted 3.10.0-327.alios7.x86_64.debug #50
[11982.353570] Hardware name: Inspur SA5212M4/YZMB-00370-102, BIOS 4.1.8 07/02/2016
[11982.353574] ffff885e675a3d40 00000000c07dba8e ffff885e3975f800 ffffffff8162a7c9
[11982.353578] ffff885e3975f868 ffffffffa0173b2e ffff885e3975f830 ffffffff8141789a
[11982.353582] ffff885e5ffec180 ffff885e604b6a08 ffff885e3975f868 ffff885e3975f848
[11982.353582] Call Trace:
[11982.353584] [<ffffffff8162a7c9>] dump_stack+0x19/0x1b
[11982.353589] [<ffffffffa0173b2e>] _scsih_qcmd+0x4be/0x5f0 [mpt3sas]
[11982.353591] [<ffffffff8141789a>] ? scsi_setup_cmnd+0xfa/0x180
[11982.353594] [<ffffffff81410b3a>] scsi_dispatch_cmd+0xaa/0x230
[11982.353596] [<ffffffff81419a61>] scsi_request_fn+0x501/0x770
[11982.353598] [<ffffffff812bf1b3>] __blk_run_queue+0x33/0x40
[11982.353601] [<ffffffff812bf26a>] queue_unplugged+0x2a/0xa0
[11982.353603] [<ffffffff812c3c28>] blk_flush_plug_list+0x1d8/0x230
[11982.353606] [<ffffffff812c4034>] blk_finish_plug+0x14/0x40
[11982.353609] [<ffffffff81215d0c>] do_blockdev_direct_IO+0xb4c/0x2610
[11982.353615] [<ffffffffa02902c0>] ? _ext4_get_block+0x1b0/0x1b0 [ext4]
[11982.353618] [<ffffffff81217825>] __blockdev_direct_IO+0x55/0x60
[11982.353623] [<ffffffffa02902c0>] ? _ext4_get_block+0x1b0/0x1b0 [ext4]
[11982.353630] [<ffffffffa02d348f>] ext4_ind_direct_IO+0x17f/0x480 [ext4]
[11982.353635] [<ffffffffa02902c0>] ? _ext4_get_block+0x1b0/0x1b0 [ext4]
[11982.353640] [<ffffffffa028f4f9>] ext4_direct_IO+0x109/0x560 [ext4]
[11982.353642] [<ffffffff810d067c>] ? current_kernel_time+0x1c/0x40
[11982.353645] [<ffffffff8107c632>] ? current_fs_time+0x12/0x60
[11982.353647] [<ffffffff81163a03>] generic_file_aio_read+0x6d3/0x750
[11982.353649] [<ffffffff811cc7b6>] ? mem_cgroup_update_page_stat+0x16/0x50
[11982.353652] [<ffffffff811d6a2d>] do_sync_read+0x8d/0xd0
[11982.353655] [<ffffffff811d718c>] vfs_read+0x9c/0x170
[11982.353657] [<ffffffff811d7ff2>] SyS_pread64+0x92/0xc0
[11982.353659] [<ffffffff8163aec9>] system_call_fastpath+0x16/0x1b

mount文件系统
#mount /dev/sdf1 /data4
CPU: 19 PID: 6265 Comm: mount 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
ffff885e5d0d24c0 000000008b6bf90e ffff885e67a8f600 ffffffff8162a7c9
ffff885e67a8f668 ffffffffa0083b2e ffff885e67a8f630 ffffffff8141789a
ffff885e5711c180 ffff885e57806a08 ffff885e67a8f668 ffff885e67a8f648
Call Trace:
[<ffffffff8162a7c9>] dump_stack+0x19/0x1b
[<ffffffffa0083b2e>] _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
[<ffffffff812c3e9a>] blk_queue_bio+0x21a/0x3a0
[<ffffffff812befe2>] generic_make_request+0xe2/0x130
[<ffffffff812bf0a1>] submit_bio+0x71/0x150
[<ffffffff8121059d>] ? bio_alloc_bioset+0x1fd/0x350
[<ffffffff8120b5b3>] _submit_bh+0x143/0x210
[<ffffffff8120e202>] __block_write_full_page+0x162/0x380
[<ffffffff81211a00>] ? I_BDEV+0x10/0x10
[<ffffffff81211a00>] ? I_BDEV+0x10/0x10
[<ffffffff8120e5eb>] block_write_full_page_endio+0xeb/0x100
[<ffffffff8120e615>] block_write_full_page+0x15/0x20
[<ffffffff81212178>] blkdev_writepage+0x18/0x20
[<ffffffff8116c5b3>] __writepage+0x13/0x50
[<ffffffff8116d0d1>] write_cache_pages+0x251/0x4d0
[<ffffffff8116c5a0>] ? global_dirtyable_memory+0x70/0x70
[<ffffffff8116d39d>] generic_writepages+0x4d/0x80
[<ffffffff8116e44e>] do_writepages+0x1e/0x40
[<ffffffff811631d5>] __filemap_fdatawrite_range+0x65/0x80
[<ffffffff8116324c>] filemap_write_and_wait+0x2c/0x60
[<ffffffff81212cef>] __sync_blockdev+0x1f/0x40
[<ffffffff81212d23>] sync_blockdev+0x13/0x20
[<ffffffffa00eb86f>] jbd2_journal_recover+0x12f/0x150 [jbd2]
[<ffffffffa00f1c6e>] jbd2_journal_load+0xde/0x3b0 [jbd2]
[<ffffffff811b9bec>] ? kmem_cache_alloc_trace+0x3c/0x1f0
[<ffffffffa02c4c52>] ? ext4_load_journal+0x596/0x709 [ext4]
[<ffffffffa02c4cc8>] ext4_load_journal+0x60c/0x709 [ext4]
[<ffffffffa029d95d>] ext4_fill_super+0x1a2d/0x2940 [ext4]
[<ffffffff811dade0>] mount_bdev+0x1b0/0x1f0
[<ffffffffa029bf30>] ? ext4_calculate_overhead+0x3d0/0x3d0 [ext4]
[<ffffffffa028dec5>] ext4_mount+0x15/0x20 [ext4]
[<ffffffff811db579>] mount_fs+0x39/0x1b0
[<ffffffff81185055>] ? __alloc_percpu+0x15/0x20
[<ffffffff811f6d9f>] vfs_kern_mount+0x5f/0xf0
[<ffffffff811f92ee>] do_mount+0x24e/0xa40
[<ffffffff8117f65b>] ? strndup_user+0x4b/0xa0
[<ffffffff811f9b76>] SyS_mount+0x96/0xf0
[<ffffffff8163aec9>] system_call_fastpath+0x16/0x1b
CPU: 19 PID: 0 Comm: swapper/19 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
ffff885e5d0d0e00 b0ecc2aa4127d34a ffff885eff063be0 ffffffff8162a7c9
ffff885eff063c48 ffffffffa0083b2e ffff885e57806cb0 00000001ff063c20
ffff885e6953e100 ffffea0179a75700 0000000000000000 ffff885eff063c28
Call Trace:
<IRQ> [<ffffffff8162a7c9>] dump_stack+0x19/0x1b
[<ffffffffa0083b2e>] _scsih_qcmd+0x4be/0x5f0 [mpt3sas]
[<ffffffff81410b3a>] scsi_dispatch_cmd+0xaa/0x230
[<ffffffff81419a61>] scsi_request_fn+0x501/0x770
[<ffffffff812bf1b3>] __blk_run_queue+0x33/0x40
[<ffffffff812bf226>] blk_run_queue+0x26/0x40
[<ffffffff81417e88>] scsi_run_queue+0x258/0x2f0
[<ffffffff81419d10>] scsi_next_command+0x20/0x40
[<ffffffff81419e85>] scsi_end_request+0x155/0x1d0
[<ffffffff8141a063>] scsi_io_completion+0x103/0x600
[<ffffffff812f3da4>] ? timerqueue_del+0x24/0x70
[<ffffffff8140f405>] scsi_finish_command+0xd5/0x130
[<ffffffff8141953a>] scsi_softirq_done+0x12a/0x150
[<ffffffff812c95c0>] blk_done_softirq+0x90/0xc0
[<ffffffff8107dfef>] __do_softirq+0xef/0x280
[<ffffffff8163c7dc>] call_softirq+0x1c/0x30
[<ffffffff81016fc5>] do_softirq+0x65/0xa0
[<ffffffff8107e385>] irq_exit+0x115/0x120
[<ffffffff81047395>] smp_call_function_single_interrupt+0x35/0x40
[<ffffffff8163bf9d>] call_function_single_interrupt+0x6d/0x80
<EOI> [<ffffffff81058e96>] ? native_safe_halt+0x6/0x10
[<ffffffff8101dbcf>] default_idle+0x1f/0xc0
[<ffffffff8101e4d6>] arch_cpu_idle+0x26/0x30
[<ffffffff810cf305>] cpu_startup_entry+0x245/0x290
[<ffffffff81047d0a>] start_secondary+0x1ba/0x230