• Chris Mason's avatar
    Btrfs: finish read pages in the order they are submitted · 4125bf76
    Chris Mason authored
    
    
    The endio is done at reverse order of bio vectors.
    
    That means for a sequential read, the page first submitted will finish
    last in a bio. Considering we will do checksum (making cache hot) for
    every page, this does introduce delay (and chance to squeeze cache used
    soon) for pages submitted at the begining.
    
    I don't observe obvious performance difference with below patch at my
    simple test, but seems more natural to finish read in the order they are
    submitted.
    Signed-off-by: default avatarShaohua Li <shaohua.li@intel.com>
    Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
    4125bf76