• K
    cfq-iosched: remove dead_key from cfq_io_context · bca4b914
    Konstantin Khlebnikov 提交于
    Remove ->dead_key field from cfq_io_context to shrink its size to 128 bytes.
    (64 bytes for 32-bit hosts)
    
    Use lower bit in ->key as dead-mark, instead of moving key to separate field.
    After this for dead cfq_io_context we got cic->key != cfqd automatically.
    Thus, io_context's last-hit cache should work without changing.
    
    Now to check ->key for non-dead state compare it with cfqd,
    instead of checking ->key for non-null value as it was before.
    
    Plus remove obsolete race protection in cfq_cic_lookup.
    This race gone after v2.6.24-1728-g4ac845a2Signed-off-by: NKonstantin Khlebnikov <khlebnikov@openvz.org>
    Signed-off-by: NJens Axboe <jens.axboe@oracle.com>
    bca4b914
iocontext.h 2.0 KB