Vivek Goyal wrote: > This patch changes anticipatory scheduler to use queue scheduling code from > elevator layer. One can go back to old as by deselecting > CONFIG_IOSCHED_AS_HIER. Even with CONFIG_IOSCHED_AS_HIER=y, with-out any > other cgroup created, AS behavior should remain the same as old. > > o AS is a single queue ioschduler, that means there is one AS queue per group. > > o common layer code select the queue to dispatch from based on fairness, and > then AS code selects the request with-in group. > > o AS runs reads and writes batches with-in group. So common layer runs timed > group queues and with-in group time, AS runs timed batches of reads and > writes. > > o Note: Previously AS write batch length was adjusted synamically whenever > a W->R batch data direction took place and when first request from the > read batch completed. > > Now write batch updation takes place when last request from the write > batch has finished during W->R transition. > > o AS runs its own anticipation logic to anticipate on reads. common layer also > does the anticipation on the group if think time of the group is with-in > slice_idle. > > o Introduced few debugging messages in AS. > > Signed-off-by: Nauman Rafique <nauman@xxxxxxxxxx> > Signed-off-by: Vivek Goyal <vgoyal@xxxxxxxxxx> Acked-by: Rik van Riel <riel@xxxxxxxxxx> _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers
