blkblock工具1

http://www.ibm.com/developerworks/cn/linux/l-cn-perf1/

http://blog.chinaunix.net/uid-24774106-id-4096470.html

http://blog.chinaunix.net/uid-7585066-id-2048703.html

[root@localhost /]# mount   -t  debugfs none  /sys/kernel/debug/

[root@localhost /]# blktrace -d /dev/sda -o - |blkparse -i - -o blkparse.out

[root@localhost /]cat blkparse.out

[root@localhost /]cat blkparse.out
  ,                 0.000000000    A  WS  +  <- (,)
  ,                 0.000007285    Q  WS  +  [syslogd]
  ,                 0.000013375    G  WS  +  [syslogd]
  ,                 0.000015850    P   N [syslogd]
  ,                 0.000017365    I   W  +  [syslogd]
  ,                 0.000019440       m   N cfq3408 insert_request
  ,                 0.000020300       m   N cfq3408 add_to_rr
  ,                 0.000021995       m   N cfq3408 preempt
  ,                 0.000022605       m   N cfq2980 slice expired t=
  ,                 0.000023220       m   N cfq2980 resid=-
  ,                 0.000026665       m   N cfq3408 set_active

。。。。。。。。

CPU0 (,):
 Reads Queued:           ,        0KiB  Writes Queued:          ,       56KiB
 Read Dispatches:        ,        0KiB  Write Dispatches:        ,       56KiB
 Reads Requeued:                        Writes Requeued:
 Reads Completed:        ,        0KiB  Writes Completed:        ,       56KiB
 Read Merges:            ,        0KiB  Write Merges:           ,       40KiB
 Read depth:                            Write depth:
 IO unplugs:                            Timer unplugs:
CPU1 (,):
 Reads Queued:           ,        0KiB  Writes Queued:           ,       12KiB
 Read Dispatches:        ,        0KiB  Write Dispatches:        ,       12KiB
 Reads Requeued:                        Writes Requeued:
 Reads Completed:        ,        0KiB  Writes Completed:        ,       12KiB
 Read Merges:            ,        0KiB  Write Merges:            ,        0KiB
 Read depth:                            Write depth:
 IO unplugs:                            Timer unplugs:           

Total (,):
 Reads Queued:           ,        0KiB  Writes Queued:          ,       68KiB
 Read Dispatches:        ,        0KiB  Write Dispatches:        ,       68KiB
 Reads Requeued:                        Writes Requeued:
 Reads Completed:        ,        0KiB  Writes Completed:        ,       68KiB
 Read Merges:            ,        0KiB  Write Merges:           ,       40KiB
 IO unplugs:                            Timer unplugs:           

A  IO was remapped to a different device   blk-core.c/trace_block_remap
B  IO bounced                              bounce.c/trace_block_bio_bounce
C  IO completion                           blk-core.c/trace_block_rq_complete
D  IO issued to driver                     elevator.c/trace_block_rq_issue
F  IO front merged with request on queue   blk-core.c/trace_block_bio_frontmerge
G  Get request                             blk-core.c/trace_block_getrq
I  IO inserted onto request queue          elevator.c/trace_block_rq_insert
M  IO back merged with request on queue    blk-core.c/trace_block_bio_backmerge
P  Plug request                            blk-core.c/trace_block_plug
Q  IO handled by request queue code        blk-core.c/trace_block_bio_queue
S  Sleep request                           blk-core.c/trace_block_sleeprq
T  Unplug due to timeout                   blk-core.c/trace_block_unplug_timer
U  Unplug request                          blk-core.c/trace_block_unplug_io
X  Split                                   bio.c/trace_block_split

R表示是read操作，W表示write操作，B是barrier operation，S是synchronous operation