block, bfq: clarify the goal of bfq_split_bfqq()

The exact, general goal of the function bfq_split_bfqq() is not that apparent. Add a comment to make it clear. Tested-by: Oleksandr Natalenko <[email protected]> Signed-off-by: Paolo Valente <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
vieko · Feb 3, 2020 · c92bdde · c92bdde
1 parent db37a34
commit c92bdde
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
@@ -5979,6 +5979,8 @@ static void bfq_finish_requeue_request(struct request *rq)
 }
 
 /*
+ * Removes the association between the current task and bfqq, assuming
+ * that bic points to the bfq iocontext of the task.
  * Returns NULL if a new bfqq should be allocated, or the old bfqq if this
  * was the last process referring to that bfqq.
  */