freebsd-skq/sys/cddl/dev/dtmalloc/dtmalloc.c
markj 5aabb39c86 The dtmalloc provider uses the short description of a malloc type as the
function name of its corresponding DTrace probes. These descriptions may
contain whitespace, but probe names cannot, so just replace any whitespace
with underscores when creating probes.

MFC after:	1 week
2013-06-28 03:14:40 +00:00

231 lines
5.3 KiB
C

/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*
* Portions Copyright 2006-2008 John Birrell jb@freebsd.org
*
* $FreeBSD$
*
*/
#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/ctype.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/dtrace.h>
#include <sys/dtrace_bsd.h>
static d_open_t dtmalloc_open;
static int dtmalloc_unload(void);
static void dtmalloc_getargdesc(void *, dtrace_id_t, void *, dtrace_argdesc_t *);
static void dtmalloc_provide(void *, dtrace_probedesc_t *);
static void dtmalloc_destroy(void *, dtrace_id_t, void *);
static void dtmalloc_enable(void *, dtrace_id_t, void *);
static void dtmalloc_disable(void *, dtrace_id_t, void *);
static void dtmalloc_load(void *);
static struct cdevsw dtmalloc_cdevsw = {
.d_version = D_VERSION,
.d_open = dtmalloc_open,
.d_name = "dtmalloc",
};
static dtrace_pattr_t dtmalloc_attr = {
{ DTRACE_STABILITY_STABLE, DTRACE_STABILITY_STABLE, DTRACE_CLASS_COMMON },
{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
{ DTRACE_STABILITY_STABLE, DTRACE_STABILITY_STABLE, DTRACE_CLASS_COMMON },
{ DTRACE_STABILITY_STABLE, DTRACE_STABILITY_STABLE, DTRACE_CLASS_COMMON },
};
static dtrace_pops_t dtmalloc_pops = {
dtmalloc_provide,
NULL,
dtmalloc_enable,
dtmalloc_disable,
NULL,
NULL,
dtmalloc_getargdesc,
NULL,
NULL,
dtmalloc_destroy
};
static struct cdev *dtmalloc_cdev;
static dtrace_provider_id_t dtmalloc_id;
static void
dtmalloc_getargdesc(void *arg, dtrace_id_t id, void *parg, dtrace_argdesc_t *desc)
{
const char *p = NULL;
switch (desc->dtargd_ndx) {
case 0:
p = "struct malloc_type *";
break;
case 1:
p = "struct malloc_type_internal *";
break;
case 2:
p = "struct malloc_type_stats *";
break;
case 3:
p = "unsigned long";
break;
case 4:
p = "int";
break;
default:
desc->dtargd_ndx = DTRACE_ARGNONE;
break;
}
if (p != NULL)
strlcpy(desc->dtargd_native, p, sizeof(desc->dtargd_native));
return;
}
static void
dtmalloc_type_cb(struct malloc_type *mtp, void *arg __unused)
{
char name[DTRACE_FUNCNAMELEN];
struct malloc_type_internal *mtip = mtp->ks_handle;
int i;
/*
* malloc_type descriptions are allowed to contain whitespace, but
* DTrace probe identifiers are not, so replace the whitespace with
* underscores.
*/
strlcpy(name, mtp->ks_shortdesc, sizeof(name));
for (i = 0; name[i] != 0; i++)
if (isspace(name[i]))
name[i] = '_';
if (dtrace_probe_lookup(dtmalloc_id, NULL, name, "malloc") != 0)
return;
(void) dtrace_probe_create(dtmalloc_id, NULL, name, "malloc", 0,
&mtip->mti_probes[DTMALLOC_PROBE_MALLOC]);
(void) dtrace_probe_create(dtmalloc_id, NULL, name, "free", 0,
&mtip->mti_probes[DTMALLOC_PROBE_FREE]);
}
static void
dtmalloc_provide(void *arg, dtrace_probedesc_t *desc)
{
if (desc != NULL)
return;
malloc_type_list(dtmalloc_type_cb, desc);
}
static void
dtmalloc_destroy(void *arg, dtrace_id_t id, void *parg)
{
}
static void
dtmalloc_enable(void *arg, dtrace_id_t id, void *parg)
{
uint32_t *p = parg;
*p = id;
}
static void
dtmalloc_disable(void *arg, dtrace_id_t id, void *parg)
{
uint32_t *p = parg;
*p = 0;
}
static void
dtmalloc_load(void *dummy)
{
/* Create the /dev/dtrace/dtmalloc entry. */
dtmalloc_cdev = make_dev(&dtmalloc_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600,
"dtrace/dtmalloc");
if (dtrace_register("dtmalloc", &dtmalloc_attr, DTRACE_PRIV_USER,
NULL, &dtmalloc_pops, NULL, &dtmalloc_id) != 0)
return;
dtrace_malloc_probe = dtrace_probe;
}
static int
dtmalloc_unload()
{
int error = 0;
dtrace_malloc_probe = NULL;
if ((error = dtrace_unregister(dtmalloc_id)) != 0)
return (error);
destroy_dev(dtmalloc_cdev);
return (error);
}
static int
dtmalloc_modevent(module_t mod __unused, int type, void *data __unused)
{
int error = 0;
switch (type) {
case MOD_LOAD:
break;
case MOD_UNLOAD:
break;
case MOD_SHUTDOWN:
break;
default:
error = EOPNOTSUPP;
break;
}
return (error);
}
static int
dtmalloc_open(struct cdev *dev __unused, int oflags __unused, int devtype __unused, struct thread *td __unused)
{
return (0);
}
SYSINIT(dtmalloc_load, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY, dtmalloc_load, NULL);
SYSUNINIT(dtmalloc_unload, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY, dtmalloc_unload, NULL);
DEV_MODULE(dtmalloc, dtmalloc_modevent, NULL);
MODULE_VERSION(dtmalloc, 1);
MODULE_DEPEND(dtmalloc, dtrace, 1, 1, 1);
MODULE_DEPEND(dtmalloc, opensolaris, 1, 1, 1);