• R
    blktrace: fix accounting of partially completed requests · af5040da
    Roman Pen 提交于
    trace_block_rq_complete does not take into account that request can
    be partially completed, so we can get the following incorrect output
    of blkparser:
    
      C   R 232 + 240 [0]
      C   R 240 + 232 [0]
      C   R 248 + 224 [0]
      C   R 256 + 216 [0]
    
    but should be:
    
      C   R 232 + 8 [0]
      C   R 240 + 8 [0]
      C   R 248 + 8 [0]
      C   R 256 + 8 [0]
    
    Also, the whole output summary statistics of completed requests and
    final throughput will be incorrect.
    
    This patch takes into account real completion size of the request and
    fixes wrong completion accounting.
    Signed-off-by: NRoman Pen <r.peniaev@gmail.com>
    CC: Steven Rostedt <rostedt@goodmis.org>
    CC: Frederic Weisbecker <fweisbec@gmail.com>
    CC: Ingo Molnar <mingo@redhat.com>
    CC: linux-kernel@vger.kernel.org
    Cc: stable@kernel.org
    Signed-off-by: NJens Axboe <axboe@fb.com>
    af5040da
blk-mq.c 33.8 KB