AcoSail/kernel_optimize_test
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s390/qdio: restrict buffer merging to eligible devices

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Only attempt to merge PENDING into EMPTY buffers for devices where
the PENDING state is actually expected (ie. IQD with CQ).
This might speed up the hot path a little bit.

Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Reviewed-by: Benjamin Block <bblock@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Julian Wiedmann 2018-03-07 14:19:43 +01:00 committed by Martin Schwidefsky
parent 0cf1e05157
commit c11a3dfd6f
1 changed files with 2 additions and 1 deletions
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drivers/s390/cio/qdio_main.c
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@ -761,7 +761,8 @@ static int get_outbound_buffer_frontier(struct qdio_q *q)
if (!count)
goto out;
count = get_buf_states(q, q->first_to_check, &state, count, 0, 1);
count = get_buf_states(q, q->first_to_check, &state, count, 0,
q->u.out.use_cq);
if (!count)
goto out;