Add some descriptions to sys/kern sysctls.

PR:	kern/148710
Tested by:	Chip Camden <sterling at camdensoftware.com>
MFC after:	1 week

5 files changed, 32 insertions, 32 deletions

diff --git a/sys/kern/kern_proc.c b/sys/kern/kern_proc.c
index 9cfbc20..519bc43 100644
--- a/sys/kern/kern_proc.c
+++ b/sys/kern/kern_proc.c
@@ -144,7 +144,7 @@ struct mtx ppeers_lock;
 uma_zone_t proc_zone;
 
 int kstack_pages = KSTACK_PAGES;
-SYSCTL_INT(_kern, OID_AUTO, kstack_pages, CTLFLAG_RD, &kstack_pages, 0, "");
+SYSCTL_INT(_kern, OID_AUTO, kstack_pages, CTLFLAG_RD, &kstack_pages, 0, "Kernel stack size in pages");
 
 CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE);
 #ifdef COMPAT_FREEBSD32
diff --git a/sys/kern/kern_tc.c b/sys/kern/kern_tc.c
index cdca3a3..c2ed128 100644
--- a/sys/kern/kern_tc.c
+++ b/sys/kern/kern_tc.c
@@ -103,7 +103,7 @@ SYSCTL_NODE(_kern_timecounter, OID_AUTO, tc, CTLFLAG_RW, 0, "");
 
 static int timestepwarnings;
 SYSCTL_INT(_kern_timecounter, OID_AUTO, stepwarnings, CTLFLAG_RW,
-    &timestepwarnings, 0, "");
+    &timestepwarnings, 0, "Log time steps");
 
 static void tc_windup(void);
 static void cpu_tick_calibrate(int);
@@ -560,7 +560,7 @@ sysctl_kern_timecounter_hardware(SYSCTL_HANDLER_ARGS)
 }
 
 SYSCTL_PROC(_kern_timecounter, OID_AUTO, hardware, CTLTYPE_STRING | CTLFLAG_RW,
-    0, 0, sysctl_kern_timecounter_hardware, "A", "");
+    0, 0, sysctl_kern_timecounter_hardware, "A", "Timecounter hardware selected");
 
 
 /* Report or change the active timecounter hardware. */
@@ -583,7 +583,7 @@ sysctl_kern_timecounter_choice(SYSCTL_HANDLER_ARGS)
 }
 
 SYSCTL_PROC(_kern_timecounter, OID_AUTO, choice, CTLTYPE_STRING | CTLFLAG_RD,
-    0, 0, sysctl_kern_timecounter_choice, "A", "");
+    0, 0, sysctl_kern_timecounter_choice, "A", "Timecounter hardware detected");
 
 /*
  * RFC 2783 PPS-API implementation.
@@ -768,7 +768,7 @@ pps_event(struct pps_state *pps, int event)
  */
 
 static int tc_tick;
-SYSCTL_INT(_kern_timecounter, OID_AUTO, tick, CTLFLAG_RD, &tc_tick, 0, "");
+SYSCTL_INT(_kern_timecounter, OID_AUTO, tick, CTLFLAG_RD, &tc_tick, 0, "Approximate number of hardclock ticks in a millisecond");
 
 void
 tc_ticktock(int cnt)
diff --git a/sys/kern/subr_clock.c b/sys/kern/subr_clock.c
index 28e0dad..c9fe3b8 100644
--- a/sys/kern/subr_clock.c
+++ b/sys/kern/subr_clock.c
@@ -50,7 +50,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/timetc.h>
 
 #define ct_debug bootverbose
-static int adjkerntz;		/* local offset from GMT in seconds */
+static int adjkerntz;		/* local offset from UTC in seconds */
 static int wall_cmos_clock;	/* wall CMOS clock assumed if != 0 */
 
 int tz_minuteswest;
@@ -61,7 +61,7 @@ int tz_dsttime;
  * kern.
  */
 SYSCTL_INT(_machdep, OID_AUTO, wall_cmos_clock,
-	CTLFLAG_RW, &wall_cmos_clock, 0, "");
+	CTLFLAG_RW, &wall_cmos_clock, 0, "CMOS clock keeps wall time");
 
 static int
 sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS)
@@ -74,7 +74,7 @@ sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS)
 }
 
 SYSCTL_PROC(_machdep, OID_AUTO, adjkerntz, CTLTYPE_INT|CTLFLAG_RW,
-	&adjkerntz, 0, sysctl_machdep_adjkerntz, "I", "");
+	&adjkerntz, 0, sysctl_machdep_adjkerntz, "I", "Local offset from UTC in seconds");
 
 /*--------------------------------------------------------------------*
  * Generic routines to convert between a POSIX date
diff --git a/sys/kern/sysv_sem.c b/sys/kern/sysv_sem.c
index cdf8d7b..cef21c0 100644
--- a/sys/kern/sysv_sem.c
+++ b/sys/kern/sysv_sem.c
@@ -212,7 +212,7 @@ SYSCTL_INT(_kern_ipc, OID_AUTO, semvmx, CTLFLAG_RW, &seminfo.semvmx, 0,
 SYSCTL_INT(_kern_ipc, OID_AUTO, semaem, CTLFLAG_RW, &seminfo.semaem, 0,
     "Adjust on exit max value");
 SYSCTL_PROC(_kern_ipc, OID_AUTO, sema, CTLFLAG_RD,
-    NULL, 0, sysctl_sema, "", "");
+    NULL, 0, sysctl_sema, "", "Semaphore id pool");
 
 static struct syscall_helper_data sem_syscalls[] = {
 	SYSCALL_INIT_HELPER(__semctl),
diff --git a/sys/kern/vfs_cache.c b/sys/kern/vfs_cache.c
index 0efdbc1..fd3f32c 100644
--- a/sys/kern/vfs_cache.c
+++ b/sys/kern/vfs_cache.c
@@ -184,27 +184,27 @@ SYSCTL_INT(_debug, OID_AUTO, vfscache, CTLFLAG_RW, &doingcache, 0,
 
 /* Export size information to userland */
 SYSCTL_INT(_debug_sizeof, OID_AUTO, namecache, CTLFLAG_RD, 0,
-	sizeof(struct namecache), "");
+	sizeof(struct namecache), "sizeof(struct namecache)");
 
 /*
  * The new name cache statistics
  */
 static SYSCTL_NODE(_vfs, OID_AUTO, cache, CTLFLAG_RW, 0, "Name cache statistics");
-#define STATNODE(mode, name, var) \
-	SYSCTL_ULONG(_vfs_cache, OID_AUTO, name, mode, var, 0, "");
-STATNODE(CTLFLAG_RD, numneg, &numneg);
-STATNODE(CTLFLAG_RD, numcache, &numcache);
-static u_long numcalls; STATNODE(CTLFLAG_RD, numcalls, &numcalls);
-static u_long dothits; STATNODE(CTLFLAG_RD, dothits, &dothits);
-static u_long dotdothits; STATNODE(CTLFLAG_RD, dotdothits, &dotdothits);
-static u_long numchecks; STATNODE(CTLFLAG_RD, numchecks, &numchecks);
-static u_long nummiss; STATNODE(CTLFLAG_RD, nummiss, &nummiss);
-static u_long nummisszap; STATNODE(CTLFLAG_RD, nummisszap, &nummisszap);
-static u_long numposzaps; STATNODE(CTLFLAG_RD, numposzaps, &numposzaps);
-static u_long numposhits; STATNODE(CTLFLAG_RD, numposhits, &numposhits);
-static u_long numnegzaps; STATNODE(CTLFLAG_RD, numnegzaps, &numnegzaps);
-static u_long numneghits; STATNODE(CTLFLAG_RD, numneghits, &numneghits);
-static u_long numupgrades; STATNODE(CTLFLAG_RD, numupgrades, &numupgrades);
+#define STATNODE(mode, name, var, descr) \
+	SYSCTL_ULONG(_vfs_cache, OID_AUTO, name, mode, var, 0, descr);
+STATNODE(CTLFLAG_RD, numneg, &numneg, "Number of negative cache entries");
+STATNODE(CTLFLAG_RD, numcache, &numcache, "Number of cache entries");
+static u_long numcalls; STATNODE(CTLFLAG_RD, numcalls, &numcalls, "Number of cache lookups");
+static u_long dothits; STATNODE(CTLFLAG_RD, dothits, &dothits, "Number of '.' hits");
+static u_long dotdothits; STATNODE(CTLFLAG_RD, dotdothits, &dotdothits, "Number of '..' hits");
+static u_long numchecks; STATNODE(CTLFLAG_RD, numchecks, &numchecks, "Number of checks in lookup");
+static u_long nummiss; STATNODE(CTLFLAG_RD, nummiss, &nummiss, "Number of cache misses");
+static u_long nummisszap; STATNODE(CTLFLAG_RD, nummisszap, &nummisszap, "Number of cache misses we do not want to cache");
+static u_long numposzaps; STATNODE(CTLFLAG_RD, numposzaps, &numposzaps, "Number of cache hits (positive) we do not want to cache");
+static u_long numposhits; STATNODE(CTLFLAG_RD, numposhits, &numposhits, "Number of cache hits (positive)");
+static u_long numnegzaps; STATNODE(CTLFLAG_RD, numnegzaps, &numnegzaps, "Number of cache hits (negative) we do not want to cache");
+static u_long numneghits; STATNODE(CTLFLAG_RD, numneghits, &numneghits, "Number of cache hits (negative)");
+static u_long numupgrades; STATNODE(CTLFLAG_RD, numupgrades, &numupgrades, "Number of updates of the cache after lookup (write lock + retry)");
 
 SYSCTL_OPAQUE(_vfs_cache, OID_AUTO, nchstats, CTLFLAG_RD | CTLFLAG_MPSAFE,
 	&nchstats, sizeof(nchstats), "LU", "VFS cache effectiveness statistics");
@@ -970,20 +970,20 @@ kern___getcwd(struct thread *td, u_char *buf, enum uio_seg bufseg, u_int buflen)
  */
 
 #undef STATNODE
-#define STATNODE(name)							\
+#define STATNODE(name, descr)						\
 	static u_int name;						\
-	SYSCTL_UINT(_vfs_cache, OID_AUTO, name, CTLFLAG_RD, &name, 0, "")
+	SYSCTL_UINT(_vfs_cache, OID_AUTO, name, CTLFLAG_RD, &name, 0, descr)
 
 static int disablefullpath;
 SYSCTL_INT(_debug, OID_AUTO, disablefullpath, CTLFLAG_RW, &disablefullpath, 0,
 	"Disable the vn_fullpath function");
 
 /* These count for kern___getcwd(), too. */
-STATNODE(numfullpathcalls);
-STATNODE(numfullpathfail1);
-STATNODE(numfullpathfail2);
-STATNODE(numfullpathfail4);
-STATNODE(numfullpathfound);
+STATNODE(numfullpathcalls, "Number of fullpath search calls");
+STATNODE(numfullpathfail1, "Number of fullpath search errors (ENOTDIR)");
+STATNODE(numfullpathfail2, "Number of fullpath search errors (VOP_VPTOCNP failures)");
+STATNODE(numfullpathfail4, "Number of fullpath search errors (ENOMEM)");
+STATNODE(numfullpathfound, "Number of successful fullpath calls");
 
 /*
  * Retrieve the full filesystem path that correspond to a vnode from the name