tree def85c8e9990293effe71baf3b0dce648eab516c
parent 766ca4428d1239a970926856c447310c9c191af2
author Aaron Carroll <aaronc@gelato.unsw.edu.au> 1218701833 +1000
committer Jens Axboe <jens.axboe@oracle.com> 1223535362 +0200

deadline-iosched: allow non-sequential batching

Deadline currently only batches sector-contiguous requests, so except
for a few circumstances (e.g. requests in a single direction), it is
essentially first come first served.  This is bad for throughput, so
change it to CSCAN, which means requests in a batch do not need to be
sequential and are issued in increasing sector order.

Signed-off-by: Aaron Carroll <aaronc@gelato.unsw.edu.au>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>