MFC r308040,308479: nap time between pats is forced to be at most half

of the timeout

Note that in this branch the default nap period is 1 second unlike the
head where the period is 10 seconds.

2 files changed, 30 insertions, 25 deletions

diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
index d6ccf3d..6945fc6 100644
--- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
+++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
@@ -6945,7 +6945,22 @@ l2arc_write_buffers(spa_t *spa, l2arc_dev_t *dev, uint64_t target_sz)
 				continue;
 			}
 
-			if ((write_asize + HDR_GET_LSIZE(hdr)) > target_sz) {
+			/*
+			 * We rely on the L1 portion of the header below, so
+			 * it's invalid for this header to have been evicted out
+			 * of the ghost cache, prior to being written out. The
+			 * ARC_FLAG_L2_WRITING bit ensures this won't happen.
+			 */
+			ASSERT(HDR_HAS_L1HDR(hdr));
+
+			ASSERT3U(HDR_GET_PSIZE(hdr), >, 0);
+			ASSERT3P(hdr->b_l1hdr.b_pdata, !=, NULL);
+			ASSERT3U(arc_hdr_size(hdr), >, 0);
+			uint64_t size = arc_hdr_size(hdr);
+			uint64_t asize = vdev_psize_to_asize(dev->l2ad_vdev,
+			    size);
+
+			if ((write_psize + asize) > target_sz) {
 				full = B_TRUE;
 				mutex_exit(hash_lock);
 				ARCSTAT_BUMP(arcstat_l2_write_full);
@@ -6980,21 +6995,6 @@ l2arc_write_buffers(spa_t *spa, l2arc_dev_t *dev, uint64_t target_sz)
 			list_insert_head(&dev->l2ad_buflist, hdr);
 			mutex_exit(&dev->l2ad_mtx);
 
-			/*
-			 * We rely on the L1 portion of the header below, so
-			 * it's invalid for this header to have been evicted out
-			 * of the ghost cache, prior to being written out. The
-			 * ARC_FLAG_L2_WRITING bit ensures this won't happen.
-			 */
-			ASSERT(HDR_HAS_L1HDR(hdr));
-
-			ASSERT3U(HDR_GET_PSIZE(hdr), >, 0);
-			ASSERT3P(hdr->b_l1hdr.b_pdata, !=, NULL);
-			ASSERT3U(arc_hdr_size(hdr), >, 0);
-			uint64_t size = arc_hdr_size(hdr);
-			uint64_t asize = vdev_psize_to_asize(dev->l2ad_vdev,
-			    size);
-
 			(void) refcount_add_many(&dev->l2ad_alloc, size, hdr);
 
 			/*
diff --git a/usr.sbin/watchdogd/watchdogd.c b/usr.sbin/watchdogd/watchdogd.c
index c63d3cd..3bad9ac 100644
--- a/usr.sbin/watchdogd/watchdogd.c
+++ b/usr.sbin/watchdogd/watchdogd.c
@@ -80,7 +80,8 @@ static u_int timeout = WD_TO_128SEC;
 static u_int exit_timeout = WD_TO_NEVER;
 static u_int pretimeout = 0;
 static u_int timeout_sec;
-static u_int passive = 0;
+static u_int nap = 1;
+static int passive = 0;
 static int is_daemon = 0;
 static int is_dry_run = 0;  /* do not arm the watchdog, only
 			       report on timing of the watch
@@ -88,7 +89,6 @@ static int is_dry_run = 0;  /* do not arm the watchdog, only
 static int do_timedog = 0;
 static int do_syslog = 1;
 static int fd = -1;
-static int nap = 1;
 static int carp_thresh_seconds = -1;
 static char *test_cmd = NULL;
 
@@ -685,10 +685,15 @@ seconds_to_pow2ns(int seconds)
 static void
 parseargs(int argc, char *argv[])
 {
+	struct timespec ts;
 	int longindex;
 	int c;
 	const char *lopt;
 
+	/* Get the default value of timeout_sec from the default timeout. */
+	pow2ns_to_ts(timeout, &ts);
+	timeout_sec = ts.tv_sec;
+
 	/*
 	 * if we end with a 'd' aka 'watchdogd' then we are the daemon program,
 	 * otherwise run as a command line utility.
@@ -731,9 +736,9 @@ parseargs(int argc, char *argv[])
 		case 't':
 			timeout_sec = atoi(optarg);
 			timeout = parse_timeout_to_pow2ns(c, NULL, optarg);
- 			if (debugging)
- 				printf("Timeout is 2^%d nanoseconds\n",
- 				    timeout);
+			if (debugging)
+				printf("Timeout is 2^%d nanoseconds\n",
+				    timeout);
 			break;
 		case 'T':
 			carp_thresh_seconds =
@@ -771,6 +776,9 @@ parseargs(int argc, char *argv[])
 		}
 	}
 
+	if (nap > timeout_sec / 2)
+		nap = timeout_sec / 2;
+
 	if (carp_thresh_seconds == -1)
 		carp_thresh_seconds = nap;
 
@@ -779,10 +787,7 @@ parseargs(int argc, char *argv[])
 	if (is_daemon && timeout < WD_TO_1SEC)
 		errx(EX_USAGE, "-t argument is less than one second.");
 	if (pretimeout_set) {
-		struct timespec ts;
-
-		pow2ns_to_ts(timeout, &ts);
-		if (pretimeout >= (uintmax_t)ts.tv_sec) {
+		if (pretimeout >= timeout_sec) {
 			errx(EX_USAGE,
 			    "pretimeout (%d) >= timeout (%d -> %ld)\n"
 			    "see manual section TIMEOUT RESOLUTION",