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Add block_bio_* tracing #57

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wants to merge 2 commits into from
Closed

Add block_bio_* tracing #57

wants to merge 2 commits into from

Commits on Oct 13, 2017

  1. iosnoop: Add block_bio_* tracing 

    Add -B option that traces block_bio_queue and block_bio_complete instead
of block_rq_*, so that things like ext4 lazy init show up too.

Without this patch:
  # bin/iosnoop 1
  Tracing block I/O for 1 seconds (buffered)...
  COMM         PID    TYPE DEV      BLOCK        BYTES     LATms
  dmcrypt_writ 3432   W    8,0      5251285248   1048576     2.53
  dmcrypt_writ 3432   WS   8,0      5251287296   1048576     4.86
  dmcrypt_writ 3432   W    8,0      5251289344   1048576     2.53
  dmcrypt_writ 3432   WS   8,0      5251291392   1048576     4.87

With it:
  # bin/iosnoop -B 1
  Tracing block I/O for 1 seconds (buffered)...
  COMM         PID    TYPE DEV      BLOCK        BYTES     LATms
  ext4lazyinit 13030  W    253,18   5251324160   1048576     6.51
  ext4lazyinit 13030  WS   253,18   5251326208   1048576     6.56
  ext4lazyinit 13030  WS   253,23   1476450560   1048576     6.56
  ext4lazyinit 13030  W    253,18   5251328256   1048576     4.73
  ext4lazyinit 13030  WS   253,18   5251330304   1048576     7.08
  ext4lazyinit 13030  WS   253,23   1476454656   1048576     7.08
  jbd2/dm-8-24 2472   WS   253,4    3967160      4096       0.79
  jbd2/dm-8-24 2472   WS   253,4    3967168      4096       0.77
  jbd2/dm-8-24 2472   WS   253,4    3967176      4096       0.76
  jbd2/dm-8-24 2472   WS   253,4    3967184      4096       0.76
  jbd2/dm-8-24 2472   WS   253,4    3967192      4096       0.76
  jbd2/dm-8-24 2472   WS   253,4    3967200      4096       0.76
  jbd2/dm-8-24 2472   WS   253,4    3967208      4096       0.76
  jbd2/dm-8-24 2472   WFS  253,4    3967216      4096       7.90
  ext4lazyinit 13030  W    253,18   5251332352   1048576     4.80
  ext4lazyinit 13030  WS   253,18   5251334400   1048576     7.16
  ext4lazyinit 13030  WS   253,23   1476458752   1048576     7.17

Using -B and -Q at the same time is not supported.

Signed-off-by: Jakub Jankowski <shasta@toxcorp.com>
    @shastah
    shastah committed Oct 13, 2017
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  2. Update man page for -B 

    Signed-off-by: Jakub Jankowski <shasta@toxcorp.com>
    @shastah
    shastah committed Oct 13, 2017
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    cd89a43 View commit details
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