• Andrew Morton's avatar
    [PATCH] remove PF_READAHEAD · 7ec6fb01
    Andrew Morton authored
    The problem with PF_READAHEAD is that if someone does a non-GFP_ATOMIC memory
    allocation we can enter page reclaim and then call writepage, while
    PF_READAHEAD is set.  The block layer then drops writes or the wrong reads on
    the floor.  It can cause data loss.
    
    A fix is complex (well, intrusive).  Given that the readahead code is now
    skipping the entire readahead attempt if the queue is congested, the setting
    of PF_READAHEAD probably is not doing anything useful anyway, so simply
    remove it.
    7ec6fb01
ll_rw_blk.c 70.9 KB