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Commit 8bcd9b04 authored by Jan Glauber's avatar Jan Glauber Committed by Martin Schwidefsky
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[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: default avatarJan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 7883097f

drivers/s390/cio/qdio_main.c

+2 −1
Original line number Diff line number Diff line
@@ -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);

drivers/s390/cio/qdio_perf.c

+2 −0
Original line number Diff line number Diff line
@@ -64,6 +64,8 @@ static int qdio_perf_proc_show(struct seq_file *m, void *v) 
		   (long)atomic_long_read(&perf_stats.fast_requeue));

	seq_printf(m, "Number of outbound target full condition\t: %li\n",

		   (long)atomic_long_read(&perf_stats.outbound_target_full));

	seq_printf(m, "Number of inbound queue full condition\t\t: %li\n",

		   (long)atomic_long_read(&perf_stats.inbound_queue_full));

	seq_printf(m, "Number of outbound tasklet mod_timer calls\t: %li\n",

		   (long)atomic_long_read(&perf_stats.debug_tl_out_timer));

	seq_printf(m, "Number of stop polling calls\t\t\t: %li\n",

drivers/s390/cio/qdio_perf.h

+1 −0
Original line number Diff line number Diff line
@@ -36,6 +36,7 @@ struct qdio_perf_stats { 
	atomic_long_t outbound_handler;

	atomic_long_t fast_requeue;

	atomic_long_t outbound_target_full;

	atomic_long_t inbound_queue_full;



	/* for debugging */

	atomic_long_t debug_tl_out_timer;