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add a read-only sysctl to display the number of entries in the fixed size

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kobj global method table; also kassert that the table has not overflowed
when defining a new method.

there are indications that the table is being overflowed in certain
situations as we gain more kobj consumers- this will allow us to check
whether kobj is at fault.  symptoms would be incorrect methods being called.
This commit is contained in:
Cameron Grant 2003-08-14 21:16:46 +00:00
parent 145b960169
commit 828447e0ca
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=118921
1 changed files with 9 additions and 5 deletions
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14
sys/kern/subr_kobj.c
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@ -33,6 +33,7 @@ __FBSDID("$FreeBSD$");
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/errno.h>
#include <sys/sysctl.h>
#ifndef TEST
#include <sys/systm.h>
#endif
@ -46,20 +47,21 @@ static MALLOC_DEFINE(M_KOBJ, "kobj", "Kernel object structures");
#ifdef KOBJ_STATS
#include <sys/sysctl.h>
u_int kobj_lookup_hits;
u_int kobj_lookup_misses;
SYSCTL_UINT(_kern, OID_AUTO, kobj_hits, CTLFLAG_RD,
&kobj_lookup_hits, 0, "")
&kobj_lookup_hits, 0, "");
SYSCTL_UINT(_kern, OID_AUTO, kobj_misses, CTLFLAG_RD,
&kobj_lookup_misses, 0, "")
&kobj_lookup_misses, 0, "");
#endif
static int kobj_next_id = 1;
SYSCTL_UINT(_kern, OID_AUTO, kobj_methodcount, CTLFLAG_RD,
&kobj_next_id, 0, "");
static int
kobj_error_method(void)
{
@ -69,8 +71,10 @@ kobj_error_method(void)
static void
kobj_register_method(struct kobjop_desc *desc)
{
if (desc->id == 0)
if (desc->id == 0) {
KASSERT((kobj_next_id < KOBJ_CACHE_SIZE), ("kobj method table overflow"));
desc->id = kobj_next_id++;
}
}
static void