MFC r262665:

Expose a few DTrace parameters as sysctls under kern.dtrace and add
descriptions for several existing sysctls.

PR:	187027

2 files changed, 12 insertions, 2 deletions

diff --git a/sys/cddl/dev/dtrace/dtrace_ioctl.c b/sys/cddl/dev/dtrace/dtrace_ioctl.c
index 87da9a7..13e8eab 100644
--- a/sys/cddl/dev/dtrace/dtrace_ioctl.c
+++ b/sys/cddl/dev/dtrace/dtrace_ioctl.c
@@ -23,7 +23,8 @@
  */
 
 static int dtrace_verbose_ioctl;
-SYSCTL_INT(_debug_dtrace, OID_AUTO, verbose_ioctl, CTLFLAG_RW, &dtrace_verbose_ioctl, 0, "");
+SYSCTL_INT(_debug_dtrace, OID_AUTO, verbose_ioctl, CTLFLAG_RW,
+    &dtrace_verbose_ioctl, 0, "log DTrace ioctls");
 
 #define DTRACE_IOCTL_PRINTF(fmt, ...)	if (dtrace_verbose_ioctl) printf(fmt, ## __VA_ARGS__ )
 
diff --git a/sys/cddl/dev/dtrace/dtrace_sysctl.c b/sys/cddl/dev/dtrace/dtrace_sysctl.c
index 00ed709..073de9f 100644
--- a/sys/cddl/dev/dtrace/dtrace_sysctl.c
+++ b/sys/cddl/dev/dtrace/dtrace_sysctl.c
@@ -22,6 +22,8 @@
  *
  */
 
+SYSCTL_NODE(_debug, OID_AUTO, dtrace, CTLFLAG_RD, 0, "DTrace debug parameters");
+
 int	dtrace_debug = 0;
 TUNABLE_INT("debug.dtrace.debug", &dtrace_debug);
 SYSCTL_INT(_debug_dtrace, OID_AUTO, debug, CTLFLAG_RW, &dtrace_debug, 0, "");
@@ -78,5 +80,12 @@ sysctl_dtrace_providers(SYSCTL_HANDLER_ARGS)
 }
 
 SYSCTL_PROC(_debug_dtrace, OID_AUTO, providers, CTLTYPE_STRING | CTLFLAG_RD,
-    0, 0, sysctl_dtrace_providers, "A", "");
+    0, 0, sysctl_dtrace_providers, "A", "available DTrace providers");
+
+SYSCTL_NODE(_kern, OID_AUTO, dtrace, CTLFLAG_RD, 0, "DTrace parameters");
+
+SYSCTL_LONG(_kern_dtrace, OID_AUTO, dof_maxsize, CTLFLAG_RW,
+    &dtrace_dof_maxsize, 0, "largest allowed DOF table");
 
+SYSCTL_LONG(_kern_dtrace, OID_AUTO, helper_actions_max, CTLFLAG_RW,
+    &dtrace_helper_actions_max, 0, "maximum number of allowed helper actions");