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| author |   Jan Glauber <jang@linux.vnet.ibm.com> | 2009-12-18 17:43:26 +0100 |
|---|---|---|
| committer |   Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2009-12-18 17:43:32 +0100 |
| commit | 8bcd9b04fdbab9cee4948501f8862af2a288f1b5 (patch) | |
| tree | 0a4767448af451b59c12f6b4d43395b86d51c6ed /drivers/s390/cio/qdio_main.c | |
| parent | [S390] qdio: remove superfluous log entries and WARN_ONs. (diff) | |
| download | linux-dev-8bcd9b04fdbab9cee4948501f8862af2a288f1b5.tar.xz linux-dev-8bcd9b04fdbab9cee4948501f8862af2a288f1b5.zip | |
[S390] qdio: add counter for input queue full condition
Add a counter to the qdio performance statistics that indicates that no
free buffers were left in the input queue. If the counter gets increased
it means that the qdio adapter filled all available buffers and possibly
had more buffers ready but could not transmit them.
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to '')
| -rw-r--r-- | drivers/s390/cio/qdio_main.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c index 4be6e84b9599..b2275c5000e7 100644 --- a/drivers/s390/cio/qdio_main.c +++ b/drivers/s390/cio/qdio_main.c @@ -486,7 +486,8 @@ static int get_inbound_buffer_frontier(struct qdio_q *q) case SLSB_P_INPUT_PRIMED: inbound_primed(q, count); q->first_to_check = add_buf(q->first_to_check, count); - atomic_sub(count, &q->nr_buf_used); + if (atomic_sub(count, &q->nr_buf_used) == 0) + qdio_perf_stat_inc(&perf_stats.inbound_queue_full); break; case SLSB_P_INPUT_ERROR: announce_buffer_error(q, count); |