• Omar Sandoval's avatar
    block: consolidate struct request timestamp fields · 522a7775
    Omar Sandoval authored
    Currently, struct request has four timestamp fields:
    
    - A start time, set at get_request time, in jiffies, used for iostats
    - An I/O start time, set at start_request time, in ktime nanoseconds,
      used for blk-stats (i.e., wbt, kyber, hybrid polling)
    - Another start time and another I/O start time, used for cfq and bfq
    
    These can all be consolidated into one start time and one I/O start
    time, both in ktime nanoseconds, shaving off up to 16 bytes from struct
    request depending on the kernel config.
    Signed-off-by: 's avatarOmar Sandoval <osandov@fb.com>
    Signed-off-by: 's avatarJens Axboe <axboe@kernel.dk>
    522a7775