tracing block activity

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작성자 조희승 댓글 0건 조회 11,840회 작성일 12-08-17 15:23

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실시간 확인
blktrace /dev/sda1 -a complete -o - | blkparse -f "%d,%S,%n,%N\n" -i -
 
 
 
 
 
blktrace /dev/sda1 -a complete -o - | blkparse -f "%s %t %t %m %d %S %n\n" -i -
결국 btrace만 사용하면 된다..
btrace -a complete /dev/sda1
btrace -a issued /dev/sda1
              barrier: barrier attribute
              complete: completed by driver
              fs: requests
              issue: issued to driver
              pc: packet command events
              queue: queue operations
              read: read traces
              requeue: requeue operations
              sync: synchronous attribute
              write: write traces
              notify: trace messages
 
 
btt를 사용하려면......
blktrace /dev/sda1
현재디렉토리에 cpu별로 파일이 여러개 생김
blkrawverify
한번 돌려주고
blkparse -O -d rs2 sdc3.blktrace.0 sdc3.blktrace.1
하나의 파일로 묶어줌
파일을 하나로 만들려면
blktrace /dev/sdc1 -o - | cat > /tmp/rs
btt -i rs2
최종 결과가 나옴
다큐먼트 ===> btt.pdf

CONFIG_BLK_DEV_IO_TRACE: Support for tracing block io actions

General informations
The Linux kernel configuration item CONFIG_BLK_DEV_IO_TRACE has multiple definitions:

block/Kconfig

The configuration item CONFIG_BLK_DEV_IO_TRACE:
  • prompt: Support for tracing block io actions
  • type: tristate
  • depends on: CONFIG_SYSFS
  • defined in block/Kconfig
  • found in Linux Kernels: from 2.6.17 release still available on 2.6.30 release

Help text

Say Y here if you want to be able to trace the block layer actions on a given queue. Tracing allows you to see any traffic happening on a block device queue. For more information (and the userspace support tools needed), fetch the blktrace tools from:
git://git.kernel.dk/blktrace.git
If unsure, say N.

kernel/trace/Kconfig

The configuration item CONFIG_BLK_DEV_IO_TRACE:

Help text

Say Y here if you want to be able to trace the block layer actions on a given queue. Tracing allows you to see any traffic happening on a block device queue. For more information (and the userspace support tools needed), fetch the blktrace tools from:
git://git.kernel.dk/blktrace.git
Tracing also is possible using the ftrace interface, e.g.:
echo 1 > /sys/block/sda/sda1/trace/enable
echo blk > /sys/kernel/debug/tracing/current_tracer
cat /sys/kernel/debug/tracing/trace_pipe
If unsure, say N.

Hardware

LKDDb

Raw data from LKDDb:
  • (none)

Sources

 
 

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