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    cfq-iosched: relax IOPRIO_CLASS_IDLE restrictions · 0871714e
    Jens Axboe 提交于
    Currently you must be root to set idle io prio class on a process. This
    is due to the fact that the idle class is implemented as a true idle
    class, meaning that it will not make progress if someone else is
    requesting disk access. Unfortunately this means that it opens DOS
    opportunities by locking down file system resources, hence it is root
    only at the moment.
    
    This patch relaxes the idle class a little, by removing the truly idle
    part (which entals a grace period with associated timer). The
    modifications make the idle class as close to zero impact as can be done
    while still guarenteeing progress. This means we can relax the root only
    criteria as well.
    Signed-off-by: NJens Axboe <jens.axboe@oracle.com>
    0871714e
cfq-iosched.c 54.2 KB