• Johann Lombardi's avatar
    jbd2: jbd2 stats through procfs · 8e85fb3f
    Johann Lombardi authored
    The patch below updates the jbd stats patch to 2.6.20/jbd2.
    The initial patch was posted by Alex Tomas in December 2005
    (http://marc.info/?l=linux-ext4&m=113538565128617&w=2).
    It provides statistics via procfs such as transaction lifetime and size.
    
    Sometimes, investigating performance problems, i find useful to have
    stats from jbd about transaction's lifetime, size, etc. here is a
    patch for review and inclusion probably.
    
    for example, stats after creation of 3M files in htree directory:
    
    [root@bob ~]# cat /proc/fs/jbd/sda/history
    R/C  tid   wait  run   lock  flush log   hndls  block inlog ctime write drop  close
    R    261   8260  2720  0     0     750   9892   8170  8187
    C    259                                                    750   0     4885  1
    R    262   20    2200  10    0     770   9836   8170  8187
    R    263   30    2200  10    0     3070  9812   8170  8187
    R    264   0     5000  10    0     1340  0      0     0
    C    261                                                    8240  3212  4957  0
    R    265   8260  1470  0     0     4640  9854   8170  8187
    R    266   0     5000  10    0     1460  0      0     0
    C    262                                                    8210  2989  4868  0
    R    267   8230  1490  10    0     4440  9875   8171  8188
    R    268   0     5000  10    0     1260  0      0     0
    C    263                                                    7710  2937  4908  0
    R    269   7730  1470  10    0     3330  9841   8170  8187
    R    270   0     5000  10    0     830   0      0     0
    C    265                                                    8140  3234  4898  0
    C    267                                                    720   0     4849  1
    R    271   8630  2740  20    0     740   9819   8170  8187
    C    269                                                    800   0     4214  1
    R    272   40    2170  10    0     830   9716   8170  8187
    R    273   40    2280  0     0     3530  9799   8170  8187
    R    274   0     5000  10    0     990   0      0     0
    
    
    where,
    
    R     - line for transaction's life from T_RUNNING to T_FINISHED
    C     - line for transaction's checkpointing
    tid   - transaction's id
    wait  - for how long we were waiting for new transaction to start
             (the longest period journal_start() took in this transaction)
    run   - real transaction's lifetime (from T_RUNNING to T_LOCKED
    lock  - how long we were waiting for all handles to close
             (time the transaction was in T_LOCKED)
    flush - how long it took to flush all data (data=ordered)
    log   - how long it took to write the transaction to the log
    hndls - how many handles got to the transaction
    block - how many blocks got to the transaction
    inlog - how many blocks are written to the log (block + descriptors)
    ctime - how long it took to checkpoint the transaction
    write - how many blocks have been written during checkpointing
    drop  - how many blocks have been dropped during checkpointing
    close - how many running transactions have been closed to checkpoint this one
    
    all times are in msec.
    
    
    [root@bob ~]# cat /proc/fs/jbd/sda/info
    280 transaction, each upto 8192 blocks
    average:
      1633ms waiting for transaction
      3616ms running transaction
      5ms transaction was being locked
      1ms flushing data (in ordered mode)
      1799ms logging transaction
      11781 handles per transaction
      5629 blocks per transaction
      5641 logged blocks per transaction
    Signed-off-by: default avatarJohann Lombardi <johann.lombardi@bull.net>
    Signed-off-by: default avatarMariusz Kozlowski <m.kozlowski@tuxland.pl>
    Signed-off-by: default avatarMingming Cao <cmm@us.ibm.com>
    Signed-off-by: default avatarEric Sandeen <sandeen@redhat.com>
    8e85fb3f
checkpoint.c 19.5 KB