Add a new type of KTRACE record for sysctl(3) invocations. It uses the

internal sysctl_sysctl_name() handler to map the MIB array to a string
name and logs this name in the trace log.  This can be useful to see
exactly which sysctls a thread is invoking.

MFC after:	1 month

3 files changed, 9 insertions, 1 deletions

diff --git a/usr.bin/ktrace/ktrace.1 b/usr.bin/ktrace/ktrace.1
index 83c80c9fd0ee..88e80a2c8fef 100644
--- a/usr.bin/ktrace/ktrace.1
+++ b/usr.bin/ktrace/ktrace.1
@@ -125,6 +125,10 @@ trace various structures
 userland traces
 .It Cm w
 context switches
+.It Cm y
+trace
+.Xr sysctl 3
+requests
 .It Cm +
 trace the default set of trace points -
 .Cm c , n , i , s , t , u
diff --git a/usr.bin/ktrace/ktrace.h b/usr.bin/ktrace/ktrace.h
index 51d85eeb45d7..e8f4d0bf7868 100644
--- a/usr.bin/ktrace/ktrace.h
+++ b/usr.bin/ktrace/ktrace.h
@@ -35,7 +35,8 @@
  */
 
 #define DEF_POINTS (KTRFAC_SYSCALL | KTRFAC_SYSRET | KTRFAC_NAMEI | \
-		  KTRFAC_GENIO | KTRFAC_PSIG | KTRFAC_USER | KTRFAC_STRUCT)
+		    KTRFAC_GENIO | KTRFAC_PSIG | KTRFAC_USER | \
+		    KTRFAC_STRUCT | KTRFAC_SYSCTL)
 
 #define ALL_POINTS (DEF_POINTS | KTRFAC_CSW)
 
diff --git a/usr.bin/ktrace/subr.c b/usr.bin/ktrace/subr.c
index cfc4f3ae0eeb..a9d3f6442cb0 100644
--- a/usr.bin/ktrace/subr.c
+++ b/usr.bin/ktrace/subr.c
@@ -83,6 +83,9 @@ getpoints(char *s)
 		case 'w':
 			facs |= KTRFAC_CSW;
 			break;
+		case 'y':
+			facs |= KTRFAC_SYSCTL;
+			break;
 		case '+':
 			facs |= DEF_POINTS;
 			break;