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Add support for the DTrace malloc provider which can enable probes

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on a per-malloc type basis.
This commit is contained in:
John Birrell 2008-05-23 00:43:36 +00:00
parent 4ead756ac8
commit 91dd776cd2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=179222
2 changed files with 78 additions and 0 deletions
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63
sys/kern/kern_malloc.c
View File

@ -46,6 +46,7 @@
__FBSDID("$FreeBSD$");
#include "opt_ddb.h"
#include "opt_kdtrace.h"
#include "opt_vm.h"
#include <sys/param.h>
@ -86,6 +87,12 @@ __FBSDID("$FreeBSD$");
#include <ddb/ddb.h>
#ifdef KDTRACE_HOOKS
#include <sys/dtrace_bsd.h>
dtrace_malloc_probe_func_t dtrace_malloc_probe;
#endif
/*
* When realloc() is called, if the new size is sufficiently smaller than
* the old size, realloc() will allocate a new, smaller block to avoid
@ -255,6 +262,17 @@ malloc_type_zone_allocated(struct malloc_type *mtp, unsigned long size,
}
if (zindx != -1)
mtsp->mts_size |= 1 << zindx;
#ifdef KDTRACE_HOOKS
if (dtrace_malloc_probe != NULL) {
uint32_t probe_id = mtip->mti_probes[DTMALLOC_PROBE_MALLOC];
if (probe_id != 0)
(dtrace_malloc_probe)(probe_id,
(uintptr_t) mtp, (uintptr_t) mtip,
(uintptr_t) mtsp, size, zindx);
}
#endif
critical_exit();
}
@ -283,6 +301,17 @@ malloc_type_freed(struct malloc_type *mtp, unsigned long size)
mtsp = &mtip->mti_stats[curcpu];
mtsp->mts_memfreed += size;
mtsp->mts_numfrees++;
#ifdef KDTRACE_HOOKS
if (dtrace_malloc_probe != NULL) {
uint32_t probe_id = mtip->mti_probes[DTMALLOC_PROBE_FREE];
if (probe_id != 0)
(dtrace_malloc_probe)(probe_id,
(uintptr_t) mtp, (uintptr_t) mtip,
(uintptr_t) mtsp, size, 0);
}
#endif
critical_exit();
}
@ -804,6 +833,40 @@ SYSCTL_PROC(_kern, OID_AUTO, malloc_stats, CTLFLAG_RD|CTLTYPE_STRUCT,
SYSCTL_INT(_kern, OID_AUTO, malloc_count, CTLFLAG_RD, &kmemcount, 0,
"Count of kernel malloc types");
void
malloc_type_list(malloc_type_list_func_t *func, void *arg)
{
struct malloc_type *mtp, **bufmtp;
int count, i;
size_t buflen;
mtx_lock(&malloc_mtx);
restart:
mtx_assert(&malloc_mtx, MA_OWNED);
count = kmemcount;
mtx_unlock(&malloc_mtx);
buflen = sizeof(struct malloc_type *) * count;
bufmtp = malloc(buflen, M_TEMP, M_WAITOK);
mtx_lock(&malloc_mtx);
if (count < kmemcount) {
free(bufmtp, M_TEMP);
goto restart;
}
for (mtp = kmemstatistics, i = 0; mtp != NULL; mtp = mtp->ks_next, i++)
bufmtp[i] = mtp;
mtx_unlock(&malloc_mtx);
for (i = 0; i < count; i++)
(func)(bufmtp[i], arg);
free(bufmtp, M_TEMP);
}
#ifdef DDB
DB_SHOW_COMMAND(malloc, db_show_malloc)
{

15
sys/sys/malloc.h
View File

@ -80,7 +80,16 @@ struct malloc_type_stats {
uint64_t _mts_reserved3; /* Reserved field. */
};
/*
* Index definitions for the mti_probes[] array.
*/
#define DTMALLOC_PROBE_MALLOC 0
#define DTMALLOC_PROBE_FREE 1
#define DTMALLOC_PROBE_MAX 2
struct malloc_type_internal {
uint32_t mti_probes[DTMALLOC_PROBE_MAX];
/* DTrace probe ID array. */
struct malloc_type_stats mti_stats[MAXCPU];
};
@ -173,6 +182,11 @@ MALLOC_DECLARE(M_IOV);
extern struct mtx malloc_mtx;
/*
* Function type used when iterating over the list of malloc types.
*/
typedef void malloc_type_list_func_t(struct malloc_type *, void *);
void contigfree(void *addr, unsigned long size, struct malloc_type *type);
void *contigmalloc(unsigned long size, struct malloc_type *type, int flags,
vm_paddr_t low, vm_paddr_t high, unsigned long alignment,
@ -183,6 +197,7 @@ void malloc_init(void *);
int malloc_last_fail(void);
void malloc_type_allocated(struct malloc_type *type, unsigned long size);
void malloc_type_freed(struct malloc_type *type, unsigned long size);
void malloc_type_list(malloc_type_list_func_t *, void *);
void malloc_uninit(void *);
void *realloc(void *addr, unsigned long size, struct malloc_type *type,
int flags);