Keep statistics on number of BIO_READ, BIO_WRITE, BIO_DELETE and BIO_FLUSH

requests as well as number of activemap updates.

Number of BIO_WRITEs and activemap updates are especially interesting, because
if those two are too close to each other, it means that your workload needs
bigger number of dirty extents. Activemap should be updated as rarely as
possible.

MFC after:	1 week

1 files changed, 11 insertions, 0 deletions

diff --git a/sbin/hastd/primary.c b/sbin/hastd/primary.c
index d8eb664..1f6585c 100644
--- a/sbin/hastd/primary.c
+++ b/sbin/hastd/primary.c
@@ -1117,6 +1117,7 @@ ggate_recv_thread(void *arg)
 		 */
 		switch (ggio->gctl_cmd) {
 		case BIO_READ:
+			res->hr_stat_read++;
 			pjdlog_debug(2,
 			    "ggate_recv: (%p) Moving request to the send queue.",
 			    hio);
@@ -1145,6 +1146,7 @@ ggate_recv_thread(void *arg)
 			QUEUE_INSERT1(hio, send, ncomp);
 			break;
 		case BIO_WRITE:
+			res->hr_stat_write++;
 			if (res->hr_resuid == 0) {
 				/*
 				 * This is first write, initialize localcnt and
@@ -1183,12 +1185,21 @@ ggate_recv_thread(void *arg)
 			mtx_lock(&res->hr_amp_lock);
 			if (activemap_write_start(res->hr_amp,
 			    ggio->gctl_offset, ggio->gctl_length)) {
+				res->hr_stat_activemap_update++;
 				(void)hast_activemap_flush(res);
 			}
 			mtx_unlock(&res->hr_amp_lock);
 			/* FALLTHROUGH */
 		case BIO_DELETE:
 		case BIO_FLUSH:
+			switch (ggio->gctl_cmd) {
+			case BIO_DELETE:
+				res->hr_stat_delete++;
+				break;
+			case BIO_FLUSH:
+				res->hr_stat_flush++;
+				break;
+			}
 			pjdlog_debug(2,
 			    "ggate_recv: (%p) Moving request to the send queues.",
 			    hio);