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Add a "show malloc" command to DDB, which prints out the current stats for

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available kernel malloc types.  Quite useful for post-mortem debugging of
memory leaks without a dump device configured on a panicked box.

MFC after:	2 weeks
This commit is contained in:
Robert Watson 2005-10-20 17:41:47 +00:00
parent d51c226b58
commit 909ed16c2b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=151519
1 changed files with 27 additions and 0 deletions
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27
sys/kern/kern_malloc.c
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@ -34,6 +34,7 @@
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_ddb.h"
#include "opt_vm.h"
#include <sys/param.h>
@ -69,6 +70,8 @@ __FBSDID("$FreeBSD$");
#include <machine/cpu.h>
#endif
#include <ddb/ddb.h>
/*
* When realloc() is called, if the new size is sufficiently smaller than
* the old size, realloc() will allocate a new, smaller block to avoid
@ -813,6 +816,30 @@ 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");
#ifdef DDB
DB_SHOW_COMMAND(malloc, db_show_malloc)
{
struct malloc_type_internal *mtip;
struct malloc_type *mtp;
u_int64_t allocs, frees;
int i;
db_printf("%18s %12s %12s %12s\n", "Type", "Allocs", "Frees",
"Used");
for (mtp = kmemstatistics; mtp != NULL; mtp = mtp->ks_next) {
mtip = (struct malloc_type_internal *)mtp->ks_handle;
allocs = 0;
frees = 0;
for (i = 0; i < MAXCPU; i++) {
allocs += mtip->mti_stats[i].mts_numallocs;
frees += mtip->mti_stats[i].mts_numfrees;
}
db_printf("%18s %12llu %12llu %12llu\n", mtp->ks_shortdesc,
allocs, frees, allocs - frees);
}
}
#endif
#ifdef MALLOC_PROFILE
static int