11927 Log, or optionally panic, on zero-length kmem allocations
Reviewed by: Dan McDonald <danmcd@joyent.com>
Reviewed by: Jason King <jason.brian.king@gmail.com>

@@ -4291,12 +4291,13 @@
         { "allocdby", ":", "given a thread, print its allocated buffers",
                 allocdby },
         { "bufctl", ":[-vh] [-a addr] [-c caller] [-e earliest] [-l latest] "
                 "[-t thd]", "print or filter a bufctl", bufctl, bufctl_help },
         { "freedby", ":", "given a thread, print its freed buffers", freedby },
-        { "kmalog", "?[ fail | slab ]",
-            "display kmem transaction log and stack traces", kmalog },
+        { "kmalog", "?[ fail | slab | zerosized ]",
+            "display kmem transaction log and stack traces for specified type",
+            kmalog },
         { "kmastat", "[-kmg]", "kernel memory allocator stats",
             kmastat },
         { "kmausers", "?[-ef] [cache ...]", "current medium and large users "
                 "of the kmem allocator", kmausers, kmausers_help },
         { "kmem_cache", "?[-n name]",