1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 * 21 * Portions Copyright 2006-2008 John Birrell jb@freebsd.org 22 * 23 * $FreeBSD$ 24 * 25 */ 26 27 #include <sys/cdefs.h> 28 #include <sys/param.h> 29 #include <sys/systm.h> 30 #include <sys/conf.h> 31 #include <sys/ctype.h> 32 #include <sys/kernel.h> 33 #include <sys/malloc.h> 34 #include <sys/module.h> 35 36 #include <sys/dtrace.h> 37 #include <sys/dtrace_bsd.h> 38 39 extern bool dtrace_malloc_enabled; 40 static uint32_t dtrace_malloc_enabled_count; 41 42 static int dtmalloc_unload(void); 43 static void dtmalloc_getargdesc(void *, dtrace_id_t, void *, dtrace_argdesc_t *); 44 static void dtmalloc_provide(void *, dtrace_probedesc_t *); 45 static void dtmalloc_destroy(void *, dtrace_id_t, void *); 46 static void dtmalloc_enable(void *, dtrace_id_t, void *); 47 static void dtmalloc_disable(void *, dtrace_id_t, void *); 48 static void dtmalloc_load(void *); 49 50 static dtrace_pattr_t dtmalloc_attr = { 51 { DTRACE_STABILITY_STABLE, DTRACE_STABILITY_STABLE, DTRACE_CLASS_COMMON }, 52 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN }, 53 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN }, 54 { DTRACE_STABILITY_STABLE, DTRACE_STABILITY_STABLE, DTRACE_CLASS_COMMON }, 55 { DTRACE_STABILITY_STABLE, DTRACE_STABILITY_STABLE, DTRACE_CLASS_COMMON }, 56 }; 57 58 static dtrace_pops_t dtmalloc_pops = { 59 .dtps_provide = dtmalloc_provide, 60 .dtps_provide_module = NULL, 61 .dtps_enable = dtmalloc_enable, 62 .dtps_disable = dtmalloc_disable, 63 .dtps_suspend = NULL, 64 .dtps_resume = NULL, 65 .dtps_getargdesc = dtmalloc_getargdesc, 66 .dtps_getargval = NULL, 67 .dtps_usermode = NULL, 68 .dtps_destroy = dtmalloc_destroy 69 }; 70 71 static dtrace_provider_id_t dtmalloc_id; 72 73 static void 74 dtmalloc_getargdesc(void *arg, dtrace_id_t id, void *parg, dtrace_argdesc_t *desc) 75 { 76 const char *p = NULL; 77 78 switch (desc->dtargd_ndx) { 79 case 0: 80 p = "struct malloc_type *"; 81 break; 82 case 1: 83 p = "struct malloc_type_internal *"; 84 break; 85 case 2: 86 p = "struct malloc_type_stats *"; 87 break; 88 case 3: 89 p = "unsigned long"; 90 break; 91 case 4: 92 p = "int"; 93 break; 94 default: 95 desc->dtargd_ndx = DTRACE_ARGNONE; 96 break; 97 } 98 99 if (p != NULL) 100 strlcpy(desc->dtargd_native, p, sizeof(desc->dtargd_native)); 101 102 return; 103 } 104 105 static void 106 dtmalloc_type_cb(struct malloc_type *mtp, void *arg __unused) 107 { 108 char name[DTRACE_FUNCNAMELEN]; 109 struct malloc_type_internal *mtip = &mtp->ks_mti; 110 int i; 111 112 /* 113 * malloc_type descriptions are allowed to contain whitespace, but 114 * DTrace probe identifiers are not, so replace the whitespace with 115 * underscores. 116 */ 117 strlcpy(name, mtp->ks_shortdesc, sizeof(name)); 118 for (i = 0; name[i] != 0; i++) 119 if (isspace(name[i])) 120 name[i] = '_'; 121 122 if (dtrace_probe_lookup(dtmalloc_id, NULL, name, "malloc") != 0) 123 return; 124 125 (void) dtrace_probe_create(dtmalloc_id, NULL, name, "malloc", 0, 126 &mtip->mti_probes[DTMALLOC_PROBE_MALLOC]); 127 (void) dtrace_probe_create(dtmalloc_id, NULL, name, "free", 0, 128 &mtip->mti_probes[DTMALLOC_PROBE_FREE]); 129 } 130 131 static void 132 dtmalloc_provide(void *arg, dtrace_probedesc_t *desc) 133 { 134 if (desc != NULL) 135 return; 136 137 malloc_type_list(dtmalloc_type_cb, desc); 138 } 139 140 static void 141 dtmalloc_destroy(void *arg, dtrace_id_t id, void *parg) 142 { 143 } 144 145 static void 146 dtmalloc_enable(void *arg, dtrace_id_t id, void *parg) 147 { 148 uint32_t *p = parg; 149 *p = id; 150 dtrace_malloc_enabled_count++; 151 if (dtrace_malloc_enabled_count == 1) 152 dtrace_malloc_enabled = true; 153 } 154 155 static void 156 dtmalloc_disable(void *arg, dtrace_id_t id, void *parg) 157 { 158 uint32_t *p = parg; 159 *p = 0; 160 dtrace_malloc_enabled_count--; 161 if (dtrace_malloc_enabled_count == 0) 162 dtrace_malloc_enabled = false; 163 } 164 165 static void 166 dtmalloc_load(void *dummy) 167 { 168 if (dtrace_register("dtmalloc", &dtmalloc_attr, DTRACE_PRIV_USER, 169 NULL, &dtmalloc_pops, NULL, &dtmalloc_id) != 0) 170 return; 171 172 dtrace_malloc_probe = dtrace_probe; 173 } 174 175 176 static int 177 dtmalloc_unload(void) 178 { 179 int error = 0; 180 181 dtrace_malloc_probe = NULL; 182 183 if ((error = dtrace_unregister(dtmalloc_id)) != 0) 184 return (error); 185 186 return (error); 187 } 188 189 static int 190 dtmalloc_modevent(module_t mod __unused, int type, void *data __unused) 191 { 192 int error = 0; 193 194 switch (type) { 195 case MOD_LOAD: 196 break; 197 198 case MOD_UNLOAD: 199 break; 200 201 case MOD_SHUTDOWN: 202 break; 203 204 default: 205 error = EOPNOTSUPP; 206 break; 207 208 } 209 210 return (error); 211 } 212 213 SYSINIT(dtmalloc_load, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY, dtmalloc_load, NULL); 214 SYSUNINIT(dtmalloc_unload, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY, dtmalloc_unload, NULL); 215 216 DEV_MODULE(dtmalloc, dtmalloc_modevent, NULL); 217 MODULE_VERSION(dtmalloc, 1); 218 MODULE_DEPEND(dtmalloc, dtrace, 1, 1, 1); 219 MODULE_DEPEND(dtmalloc, opensolaris, 1, 1, 1); 220