common/dtrace/dtrace.c

235 static dtrace_probe_t	**dtrace_probes;	/* array of all probes */
236 static int		dtrace_nprobes;		/* number of probes */
245 static dtrace_hash_t	*dtrace_bymod;		/* probes hashed by module */
246 static dtrace_hash_t	*dtrace_byfunc;		/* probes hashed by function */
247 static dtrace_hash_t	*dtrace_byname;		/* probes hashed by name */
274  *     including enabling state, probes, ECBs, consumer state, helper state,
338  * provider of the BEGIN, END, and ERROR probes).
3471 				 * results for anchored probes.
4480 		 * probes will not activate in user contexts to which the
4512 		 * probes will not activate in user contexts to which the
4536 		 * probes will not activate in user contexts to which the
7339 	 * probes in its current context.
8018  * DTrace framework to look-up probes in, add probes to and remove probes from
8345  * These functions are used to match groups of probes, given some elements of
8679  * probes: if each field is the empty string, reset dtpk_fmatch to
8897 	 * probes, we refuse to let providers slither away, unless this
8914 	 * Attempt to destroy the probes associated with this provider.
8957 	 * All of the probes for this provider are disabled; we can safely
8983 	 * The provider's probes have been removed from the hash chains and
9039  * specified provider will fail, but its probes will not be removed.
9073  * Remove all the unenabled probes for the given provider.  This function is
9075  * -- just as many of its associated probes as it can.
9094 	 * Attempt to destroy the probes associated with this provider.
9135  * including functions to create probes, look-up probes, and call into the
9136  * providers to request that probes be provided.  Some of these functions are
9148 	dtrace_probe_t *probe, **probes;
9189 		probes = kmem_zalloc(nsize, KM_SLEEP);
9193 			dtrace_probes = probes;
9198 			bcopy(oprobes, probes, osize);
9200 			dtrace_probes = probes;
9205 			 * All CPUs are now seeing the new probes array; we can
9312  * Called to indicate that a probe -- or probes -- should be provided by a
9314  * be told to provide all of its probes.  (This is done whenever a new
9318  * to support the creation of probes on-the-fly.  (So-called _autocreated_
9319  * probes.)  If the provider is NULL, the operations will be applied to all
9525 	 * Create the probes.
9578 	 * We may have just created probes, so we must now rematch against
9693 	 * If there are providers and probes ready to go, pass them
12964 			 * probes, we kick out -- perhaps with some number of
12965 			 * them enabled.  Leaving enabled probes enabled may
13001 	 * Iterate over all retained enablings to see if any probes match
13025  * If an enabling is to be enabled without having matched probes (that is, if
13031  * enabling any probes, we create ECBs for every ECB decription, but with a
13066  * Called to indicate that probes should be provided due to retained
13069  * entry point explicitly to allow for autocreated probes.
13116  * Called to reap ECBs that are attached to probes from defunct providers.
13168 		 * with the defunct provider's probes.
14198 	 * set, do not permit sections relating to providers, probes, or args.
14785 			 * Make all probes in all zones visible.  However,
14950 	 * prereserved space to be the space required by the END probes.
15449 	 * Now we can safely disable and destroy any enabled probes.  Because
15450 	 * any DTRACE_PRIV_KERNEL probes may actually be slowing our progress
15452 	 * ECBs:  in the first, we disable just DTRACE_PRIV_KERNEL probes, and
16252 	 * Take a pass through the probes to check for errors.
16716 	 * Enabling probes requires that cpu_lock be held, and we cannot hold
16785 	"kldunload: attempt to unload module that has DTrace probes enabled\n");
16825 				    "enabled probes", ctl->mod_modname);
16828 				    "enabled probes", modname);
16858 	 * We've removed all of the module's probes from the hash chains and
17159 	 * probes, and then match any anonymous enabling against them.  Note
17173 		 * enable the probes.  We have to drop all of our locks, pick
17247 	 * Ask all providers to provide all their probes.