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Add a facility to dynamically adjust or unconfigure p1003_1b mib.

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Use it to allow to tune sem_nsem_max at runtime, only when sem.ko
module is present in kernel.

Requested and tested by:	amdmi3
Reviewed by:	jhb
MFC after:	3 days
This commit is contained in:
kib 2010-06-02 09:59:05 +00:00
parent fca046e372
commit 5e1e617f5e
3 changed files with 38 additions and 5 deletions
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40
sys/kern/posix4_mib.c
View File

@ -45,6 +45,8 @@ __FBSDID("$FreeBSD$");
static int facility[CTL_P1003_1B_MAXID - 1];
static int facility_initialized[CTL_P1003_1B_MAXID - 1];
static int p31b_sysctl_proc(SYSCTL_HANDLER_ARGS);
/* OID_AUTO isn't working with sysconf(3). I guess I'd have to
* modify it to do a lookup by name from the index.
* For now I've left it a top-level sysctl.
@ -55,16 +57,21 @@ static int facility_initialized[CTL_P1003_1B_MAXID - 1];
SYSCTL_DECL(_p1003_1b);
#define P1B_SYSCTL(num, name) \
SYSCTL_INT(_p1003_1b, num, \
name, CTLFLAG_RD, facility + num - 1, 0, "");
SYSCTL_INT(_p1003_1b, num, name, CTLFLAG_RD, facility + num - 1, 0, "");
#define P1B_SYSCTL_RW(num, name) \
SYSCTL_PROC(_p1003_1b, num, name, CTLTYPE_INT | CTLFLAG_RW, NULL, num, \
p31b_sysctl_proc, "I", "");
#else
SYSCTL_DECL(_kern_p1003_1b);
#define P1B_SYSCTL(num, name) \
SYSCTL_INT(_kern_p1003_1b, OID_AUTO, \
name, CTLFLAG_RD, facility + num - 1, 0, "");
SYSCTL_INT(_kern_p1003_1b, OID_AUTO, name, CTLFLAG_RD, \
facility + num - 1, 0, "");
#define P1B_SYSCTL_RW(num, name) \
SYSCTL_PROC(_p1003_1b, OID_AUTO, name, CTLTYPE_INT | CTLFLAG_RW, NULL, \
num, p31b_sysctl_proc, "I", "");
SYSCTL_NODE(_kern, OID_AUTO, p1003_1b, CTLFLAG_RW, 0, "P1003.1B");
#endif
@ -91,13 +98,28 @@ P1B_SYSCTL(CTL_P1003_1B_DELAYTIMER_MAX, delaytimer_max);
P1B_SYSCTL(CTL_P1003_1B_MQ_OPEN_MAX, mq_open_max);
P1B_SYSCTL(CTL_P1003_1B_PAGESIZE, pagesize);
P1B_SYSCTL(CTL_P1003_1B_RTSIG_MAX, rtsig_max);
P1B_SYSCTL(CTL_P1003_1B_SEM_NSEMS_MAX, sem_nsems_max);
P1B_SYSCTL_RW(CTL_P1003_1B_SEM_NSEMS_MAX, sem_nsems_max);
P1B_SYSCTL(CTL_P1003_1B_SEM_VALUE_MAX, sem_value_max);
P1B_SYSCTL(CTL_P1003_1B_SIGQUEUE_MAX, sigqueue_max);
P1B_SYSCTL(CTL_P1003_1B_TIMER_MAX, timer_max);
#define P31B_VALID(num) ((num) >= 1 && (num) < CTL_P1003_1B_MAXID)
static int
p31b_sysctl_proc(SYSCTL_HANDLER_ARGS)
{
int error, num, val;
num = arg2;
if (!P31B_VALID(num))
return (EINVAL);
val = facility_initialized[num] ? facility[num - 1] : 0;
error = sysctl_handle_int(oidp, &val, 0, req);
if (error == 0 && req->newptr != NULL && facility_initialized[num])
facility[num - 1] = val;
return (error);
}
/* p31b_setcfg: Set the configuration
*/
void
@ -110,6 +132,14 @@ p31b_setcfg(int num, int value)
}
}
void
p31b_unsetcfg(int num)
{
facility[num - 1] = 0;
facility_initialized[num -1] = 0;
}
int
p31b_getcfg(int num)
{

2
sys/kern/uipc_sem.c
View File

@ -976,6 +976,8 @@ ksem_module_destroy(void)
sx_destroy(&ksem_dict_lock);
mtx_destroy(&ksem_count_lock);
mtx_destroy(&sem_lock);
p31b_unsetcfg(CTL_P1003_1B_SEM_VALUE_MAX);
p31b_unsetcfg(CTL_P1003_1B_SEM_NSEMS_MAX);
}
static int

1
sys/sys/posix4.h
View File

@ -64,6 +64,7 @@ int p31b_proc(struct proc *, pid_t, struct proc **);
void p31b_setcfg(int, int);
int p31b_getcfg(int);
int p31b_iscfg(int);
void p31b_unsetcfg(int);
#ifdef _KPOSIX_PRIORITY_SCHEDULING