• Jens Axboe's avatar
    [PATCH] cfq-iosched: correctly set ioprio on both targets · 35e6077c
    Jens Axboe authored
    Patch originally from Vasily Tarasov <vtaras@sw.ru>
    
    If you set io-priority of process 1 using sys_ioprio_set system call by
    another process 2 (like ionice do), then cfq_init_prio_data() function
    sets priority of process 2 (current) on queue of process 1 and clears
    the flag, that designates change of ioprio.  So the process  1 will work
    like with priority of process 2.
    
    I propose not to call cfq_init_prio_data() on io-priority change, but
    only mark queue as queue with changed prority.  Every time when new
    request comes cfq-scheduler checks for this flag and atomaticaly changes
    priority of queue to new value.
    Signed-off-by: default avatarJens Axboe <axboe@suse.de>
    35e6077c
cfq-iosched.c 57.4 KB