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Introduce a way to make pure kernal threads.

Browse Source 
kthread_add() takes the same parameters as the old kthread_create()
plus a pointer to a process structure, and adds a kernel thread
to that process.

kproc_kthread_add() takes the parameters for kthread_add,
plus a process name and a pointer to a pointer to a process instead of just
a pointer, and if the proc * is NULL, it creates the process to the
specifications required, before adding the thread to it.

All other old kthread_xxx() calls return, but act on (struct thread *)
instead of (struct proc *). One reason to change the name is so that
any old kernel modules that are lying around and expect kthread_create()
to make a process will not just accidentally link.

fix top to show  kernel threads by their thread name in -SH mode
add a tdnam formatting option to ps to show thread names.

make all idle threads actual kthreads and put them into their own idled process.
make all interrupt threads kthreads and put them in an interd process
(mainly for aesthetic and accounting reasons)
rename proc 0 to be 'kernel' and it's swapper thread is now 'swapper'

man page fixes to follow.
This commit is contained in:
Julian Elischer 2007-10-26 08:00:41 +00:00
parent c47b138a96
commit 7ab24ea3b9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=173004
16 changed files with 388 additions and 103 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
bin/ps/extern.h
View File

@ -39,7 +39,7 @@ extern fixpt_t ccpu;
extern int cflag, eval, fscale, nlistread, rawcpu;
extern unsigned long mempages;
extern time_t now;
extern int sumrusage, termwidth, totwidth;
extern int showthreads, sumrusage, termwidth, totwidth;
extern STAILQ_HEAD(velisthead, varent) varlist;
__BEGIN_DECLS
@ -78,6 +78,7 @@ int s_uname(KINFO *);
void showkey(void);
void started(KINFO *, VARENT *);
void state(KINFO *, VARENT *);
void tdnam(KINFO *, VARENT *);
void tdev(KINFO *, VARENT *);
void tname(KINFO *, VARENT *);
void ucomm(KINFO *, VARENT *);

2
bin/ps/keyword.c
View File

@ -187,6 +187,8 @@ static VAR var[] = {
UINT, UIDFMT, 0},
{"tdev", "TDEV", NULL, 0, tdev, NULL, 4, 0, CHAR, NULL, 0},
{"time", "TIME", NULL, USER, cputime, NULL, 9, 0, CHAR, NULL, 0},
{"tdnam", "THRDNAME", NULL, LJUST, tdnam, NULL, COMMLEN, 0, CHAR,
NULL, 0},
{"tpgid", "TPGID", NULL, 0, kvar, NULL, 4, KOFF(ki_tpgid), UINT,
PIDFMT, 0},
{"tsid", "TSID", NULL, 0, kvar, NULL, PIDLEN, KOFF(ki_tsid), UINT,

25
bin/ps/print.c
View File

@ -129,9 +129,11 @@ command(KINFO *k, VARENT *ve)
v = ve->var;
if (cflag) {
/* If it is the last field, then don't pad */
if (STAILQ_NEXT(ve, next_ve) == NULL)
if (STAILQ_NEXT(ve, next_ve) == NULL) {
(void)printf("%s", k->ki_p->ki_comm);
else
if (showthreads && k->ki_p->ki_numthreads > 1)
printf("/%s", k->ki_p->ki_ocomm);
} else
(void)printf("%-*s", v->width, k->ki_p->ki_comm);
return;
}
@ -178,12 +180,27 @@ ucomm(KINFO *k, VARENT *ve)
VAR *v;
v = ve->var;
if (STAILQ_NEXT(ve, next_ve) == NULL) /* last field, don't pad */
if (STAILQ_NEXT(ve, next_ve) == NULL) { /* last field, don't pad */
(void)printf("%s", k->ki_p->ki_comm);
else
if (showthreads && k->ki_p->ki_numthreads > 1)
printf("/%s", k->ki_p->ki_ocomm);
} else
(void)printf("%-*s", v->width, k->ki_p->ki_comm);
}
void
tdnam(KINFO *k, VARENT *ve)
{
VAR *v;
v = ve->var;
if (showthreads && k->ki_p->ki_numthreads > 1)
(void)printf("%-*s", v->width, k->ki_p->ki_ocomm);
else
(void)printf("%-*s", v->width, " " );
}
void
logname(KINFO *k, VARENT *ve)
{

3
bin/ps/ps.c
View File

@ -98,6 +98,7 @@ int rawcpu; /* -C */
int sumrusage; /* -S */
int termwidth; /* Width of the screen (0 == infinity). */
int totwidth; /* Calculated-width of requested variables. */
int showthreads; /* will threads be shown? */
struct velisthead varlist = STAILQ_HEAD_INITIALIZER(varlist);
@ -175,7 +176,7 @@ main(int argc, char *argv[])
char *cols;
int all, ch, elem, flag, _fmt, i, lineno;
int nentries, nkept, nselectors;
int prtheader, showthreads, wflag, what, xkeep, xkeep_implied;
int prtheader, wflag, what, xkeep, xkeep_implied;
char errbuf[_POSIX2_LINE_MAX];
(void) setlocale(LC_ALL, "");

9
lib/libkvm/kvm_proc.c
View File

@ -120,6 +120,10 @@ kvm_proclist(kd, what, arg, p, bp, maxcnt)
kp = &kinfo_proc;
kp->ki_structsize = sizeof(kinfo_proc);
/*
* Loop on the processes. this is completely broken because we need to be
* able to loop on the threads and merge the ones that are the same process some how.
*/
for (; cnt < maxcnt && p != NULL; p = LIST_NEXT(&proc, p_list)) {
memset(kp, 0, sizeof *kp);
if (KREAD(kd, (u_long)p, &proc)) {
@ -402,8 +406,11 @@ kvm_proclist(kd, what, arg, p, bp, maxcnt)
kp->ki_pri.pri_native = mtd.td_base_pri;
kp->ki_lastcpu = mtd.td_lastcpu;
kp->ki_wchan = mtd.td_wchan;
if (mtd.td_name[0] != 0)
strlcpy(kp->ki_ocomm, mtd.td_name, MAXOCOMLEN);
kp->ki_oncpu = mtd.td_oncpu;
if (mtd.td_name[0] != '\0')
strlcpy(kp->ki_ocomm, mtd.td_name, sizeof(kp->ki_ocomm));
if (!(proc.p_flag & P_SA)) {
kp->ki_pctcpu = 0;
kp->ki_rqindex = 0;

5
sys/kern/init_main.c
View File

@ -427,12 +427,13 @@ proc0_init(void *dummy __unused)
td->td_priority = PVM;
td->td_base_pri = PUSER;
td->td_oncpu = 0;
td->td_flags = TDF_INMEM;
td->td_flags = TDF_INMEM|TDP_KTHREAD;
p->p_peers = 0;
p->p_leader = p;
bcopy("swapper", p->p_comm, sizeof ("swapper"));
strncpy(p->p_comm, "kernel", sizeof (p->p_comm));
strncpy(td->td_name, "swapper", sizeof (td->td_name));
callout_init(&p->p_itcallout, CALLOUT_MPSAFE);
callout_init_mtx(&p->p_limco, &p->p_mtx, 0);

7
sys/kern/kern_exit.c
View File

@ -136,8 +136,7 @@ exit1(struct thread *td, int rv)
* MUST abort all other threads before proceeding past here.
*/
PROC_LOCK(p);
if (p->p_flag & P_HADTHREADS) {
retry:
while (p->p_flag & P_HADTHREADS) {
/*
* First check if some other thread got here before us..
* if so, act apropriatly, (exit or suspend);
@ -161,8 +160,8 @@ exit1(struct thread *td, int rv)
* re-check all suspension request, the thread should
* either be suspended there or exit.
*/
if (thread_single(SINGLE_EXIT))
goto retry;
if (! thread_single(SINGLE_EXIT))
break;
/*
* All other activity in this process is now stopped.

18
sys/kern/kern_idle.c
View File

@ -60,27 +60,25 @@ idle_setup(void *dummy)
#ifdef SMP
SLIST_FOREACH(pc, &cpuhead, pc_allcpu) {
error = kproc_create(sched_idletd, NULL, &p,
RFSTOPPED | RFHIGHPID, 0, "idle: cpu%d", pc->pc_cpuid);
pc->pc_idlethread = FIRST_THREAD_IN_PROC(p);
#else
error = kproc_create(sched_idletd, NULL, &p,
RFSTOPPED | RFHIGHPID, 0, "idle");
PCPU_SET(idlethread, FIRST_THREAD_IN_PROC(p));
#endif
error = kproc_kthread_add(sched_idletd, NULL, &p, &td,
RFSTOPPED | RFHIGHPID, 0, "idled", "idle: cpu%d", pc->pc_cpuid);
#ifdef SMP
pc->pc_idlethread = td;
#else
PCPU_SET(idlethread, td);
#endif
p = td->td_proc;
if (error)
panic("idle_setup: kproc_create error %d\n", error);
PROC_LOCK(p);
p->p_flag |= P_NOLOAD;
td = FIRST_THREAD_IN_PROC(p);
thread_lock(td);
TD_SET_CAN_RUN(td);
td->td_flags |= TDF_IDLETD;
sched_class(td, PRI_IDLE);
sched_prio(td, PRI_MAX_IDLE);
thread_unlock(td);
PROC_UNLOCK(p);
#ifdef SMP
}
#endif

38
sys/kern/kern_intr.c
View File

@ -80,6 +80,7 @@ struct intr_event *clk_intr_event;
struct intr_event *tty_intr_event;
void *softclock_ih;
void *vm_ih;
struct proc *intrproc;
static MALLOC_DEFINE(M_ITHREAD, "ithread", "Interrupt Threads");
@ -171,8 +172,7 @@ ithread_update(struct intr_thread *ithd)
pri = TAILQ_FIRST(&ie->ie_handlers)->ih_pri;
/* Update name and priority. */
strlcpy(td->td_proc->p_comm, ie->ie_fullname,
sizeof(td->td_proc->p_comm));
strlcpy(td->td_name, ie->ie_fullname, sizeof(td->td_name));
thread_lock(td);
sched_prio(td, pri);
thread_unlock(td);
@ -332,16 +332,15 @@ ithread_create(const char *name)
{
struct intr_thread *ithd;
struct thread *td;
struct proc *p;
int error;
ithd = malloc(sizeof(struct intr_thread), M_ITHREAD, M_WAITOK | M_ZERO);
error = kproc_create(ithread_loop, ithd, &p, RFSTOPPED | RFHIGHPID,
0, "%s", name);
error = kproc_kthread_add(ithread_loop, ithd, &intrproc,
&td, RFSTOPPED | RFHIGHPID,
0, "interd", "%s", name);
if (error)
panic("kproc_create() failed with %d", error);
td = FIRST_THREAD_IN_PROC(p); /* XXXKSE */
thread_lock(td);
sched_class(td, PRI_ITHD);
TD_SET_IWAIT(td);
@ -357,16 +356,15 @@ ithread_create(const char *name, struct intr_handler *ih)
{
struct intr_thread *ithd;
struct thread *td;
struct proc *p;
int error;
ithd = malloc(sizeof(struct intr_thread), M_ITHREAD, M_WAITOK | M_ZERO);
error = kproc_create(ithread_loop, ih, &p, RFSTOPPED | RFHIGHPID,
0, "%s", name);
error = kproc_kthread_create(ithread_loop, ih, &intrproc,
&td, RFSTOPPED | RFHIGHPID,
0, "interd", "%s", name);
if (error)
panic("kproc_create() failed with %d", error);
td = FIRST_THREAD_IN_PROC(p); /* XXXKSE */
thread_lock(td);
sched_class(td, PRI_ITHD);
TD_SET_IWAIT(td);
@ -688,7 +686,7 @@ intr_event_schedule_thread(struct intr_event *ie)
*/
if (harvest.interrupt && ie->ie_flags & IE_ENTROPY) {
CTR3(KTR_INTR, "%s: pid %d (%s) gathering entropy", __func__,
p->p_pid, p->p_comm);
p->p_pid, td->td_name);
entropy.event = (uintptr_t)ie;
entropy.td = ctd;
random_harvest(&entropy, sizeof(entropy), 2, 0,
@ -706,12 +704,12 @@ intr_event_schedule_thread(struct intr_event *ie)
thread_lock(td);
if (TD_AWAITING_INTR(td)) {
CTR3(KTR_INTR, "%s: schedule pid %d (%s)", __func__, p->p_pid,
p->p_comm);
td->td_name);
TD_CLR_IWAIT(td);
sched_add(td, SRQ_INTR);
} else {
CTR5(KTR_INTR, "%s: pid %d (%s): it_need %d, state %d",
__func__, p->p_pid, p->p_comm, it->it_need, td->td_state);
__func__, p->p_pid, td->td_name, it->it_need, td->td_state);
}
thread_unlock(td);
@ -842,7 +840,7 @@ intr_event_schedule_thread(struct intr_event *ie, struct intr_thread *it)
*/
if (harvest.interrupt && ie->ie_flags & IE_ENTROPY) {
CTR3(KTR_INTR, "%s: pid %d (%s) gathering entropy", __func__,
p->p_pid, p->p_comm);
p->p_pid, td->td_name);
entropy.event = (uintptr_t)ie;
entropy.td = ctd;
random_harvest(&entropy, sizeof(entropy), 2, 0,
@ -860,12 +858,12 @@ intr_event_schedule_thread(struct intr_event *ie, struct intr_thread *it)
thread_lock(td);
if (TD_AWAITING_INTR(td)) {
CTR3(KTR_INTR, "%s: schedule pid %d (%s)", __func__, p->p_pid,
p->p_comm);
th->th_name);
TD_CLR_IWAIT(td);
sched_add(td, SRQ_INTR);
} else {
CTR5(KTR_INTR, "%s: pid %d (%s): it_need %d, state %d",
__func__, p->p_pid, p->p_comm, it->it_need, td->td_state);
__func__, p->p_pid, td->td_name, it->it_need, td->td_state);
}
thread_unlock(td);
@ -1100,9 +1098,9 @@ ithread_loop(void *arg)
*/
if (ithd->it_flags & IT_DEAD) {
CTR3(KTR_INTR, "%s: pid %d (%s) exiting", __func__,
p->p_pid, p->p_comm);
p->p_pid, td->td_name);
free(ithd, M_ITHREAD);
kproc_exit(0);
kthread_exit(0);
}
/*
@ -1171,9 +1169,9 @@ ithread_loop(void *arg)
*/
if (ithd->it_flags & IT_DEAD) {
CTR3(KTR_INTR, "%s: pid %d (%s) exiting", __func__,
p->p_pid, p->p_comm);
p->p_pid, td->td_name);
free(ithd, M_ITHREAD);
kproc_exit(0);
kthread_exit(0);
}
/*

211
sys/kern/kern_kthread.c
View File

@ -39,6 +39,8 @@ __FBSDID("$FreeBSD$");
#include <sys/unistd.h>
#include <sys/wait.h>
#include <sys/sched.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <machine/stdarg.h>
@ -95,7 +97,9 @@ kproc_create(void (*func)(void *), void *arg,
/* this is a non-swapped system process */
PROC_LOCK(p2);
td = FIRST_THREAD_IN_PROC(p2);
p2->p_flag |= P_SYSTEM | P_KTHREAD;
td->td_pflags |= TDP_KTHREAD;
mtx_lock(&p2->p_sigacts->ps_mtx);
p2->p_sigacts->ps_flag |= PS_NOCLDWAIT;
mtx_unlock(&p2->p_sigacts->ps_mtx);
@ -105,9 +109,12 @@ kproc_create(void (*func)(void *), void *arg,
va_start(ap, fmt);
vsnprintf(p2->p_comm, sizeof(p2->p_comm), fmt, ap);
va_end(ap);
/* set up arg0 for 'ps', et al */
va_start(ap, fmt);
vsnprintf(td->td_name, sizeof(td->td_name), fmt, ap);
va_end(ap);
/* call the processes' main()... */
td = FIRST_THREAD_IN_PROC(p2);
cpu_set_fork_handler(td, func, arg);
TD_SET_CAN_RUN(td);
@ -167,7 +174,7 @@ kproc_suspend(struct proc *p, int timo)
}
SIGADDSET(p->p_siglist, SIGSTOP);
wakeup(p);
return msleep(&p->p_siglist, &p->p_mtx, PPAUSE | PDROP, "suspkt", timo);
return msleep(&p->p_siglist, &p->p_mtx, PPAUSE | PDROP, "suspkp", timo);
}
int
@ -194,7 +201,205 @@ kproc_suspend_check(struct proc *p)
PROC_LOCK(p);
while (SIGISMEMBER(p->p_siglist, SIGSTOP)) {
wakeup(&p->p_siglist);
msleep(&p->p_siglist, &p->p_mtx, PPAUSE, "ktsusp", 0);
msleep(&p->p_siglist, &p->p_mtx, PPAUSE, "kpsusp", 0);
}
PROC_UNLOCK(p);
}
/*
* Start a kernel thread.
*
* This function is used to start "internal" daemons and intended
* to be called from SYSINIT().
*/
void
kthread_start(udata)
const void *udata;
{
const struct kthread_desc *kp = udata;
int error;
error = kthread_add((void (*)(void *))kp->func, NULL,
NULL, kp->global_threadpp, 0, 0, "%s", kp->arg0);
if (error)
panic("kthread_start: %s: error %d", kp->arg0, error);
}
/*
* Create a kernel thread. It shares its address space
* with proc0 - ie: kernel only.
*
* func is the function to start.
* arg is the parameter to pass to function on first startup.
* newtdp is the return value pointing to the thread's struct thread.
* ** XXX fix this --> flags are flags to fork1 (in unistd.h)
* ** XXX are any used?
* fmt and following will be *printf'd into (*newtd)->td_name (for ps, etc.).
*/
int
kthread_add(void (*func)(void *), void *arg, struct proc *p,
struct thread **newtdp, int flags, int pages, const char *fmt, ...)
{
va_list ap;
struct thread *newtd, *oldtd;
int error;
if (!proc0.p_stats)
panic("kthread_add called too soon");
error = 0;
if (p == NULL) {
p = &proc0;
oldtd = &thread0;
} else {
oldtd = FIRST_THREAD_IN_PROC(p);
}
/* Initialize our td */
newtd = thread_alloc();
if (newtd == NULL)
return (ENOMEM);
bzero(&newtd->td_startzero,
__rangeof(struct thread, td_startzero, td_endzero));
/* XXX check if we should zero. */
bcopy(&oldtd->td_startcopy, &newtd->td_startcopy,
__rangeof(struct thread, td_startcopy, td_endcopy));
/* set up arg0 for 'ps', et al */
va_start(ap, fmt);
vsnprintf(newtd->td_name, sizeof(newtd->td_name), fmt, ap);
va_end(ap);
newtd->td_proc = p; /* needed for cpu_set_upcall */
/* XXX optimise this probably? */
/* On x86 (and probably the others too) it is way too full of junk */
/* Needs a better name */
cpu_set_upcall(newtd, oldtd);
/* put the designated function(arg) as the resume context */
cpu_set_fork_handler(newtd, func, arg);
newtd->td_pflags |= TDP_KTHREAD;
newtd->td_ucred = crhold(p->p_ucred);
/* Allocate and switch to an alternate kstack if specified. */
if (pages != 0)
vm_thread_new_altkstack(newtd, pages);
/* this code almost the same as create_thread() in kern_thr.c */
PROC_LOCK(p);
p->p_flag |= P_HADTHREADS;
newtd->td_sigmask = oldtd->td_sigmask; /* XXX dubious */
PROC_SLOCK(p);
thread_link(newtd, p);
thread_lock(oldtd);
/* let the scheduler know about these things. */
sched_fork_thread(oldtd, newtd);
TD_SET_CAN_RUN(newtd);
thread_unlock(oldtd);
PROC_SUNLOCK(p);
PROC_UNLOCK(p);
/* Delay putting it on the run queue until now. */
if (!(flags & RFSTOPPED)) {
thread_lock(newtd);
sched_add(newtd, SRQ_BORING);
thread_unlock(newtd);
}
if (newtdp)
*newtdp = newtd;
return 0;
}
void
kthread_exit(int ecode)
{
thread_exit();
}
/*
* Advise a kernel process to suspend (or resume) in its main loop.
* Participation is voluntary.
*/
int
kthread_suspend(struct thread *td, int timo)
{
if ((td->td_pflags & TDP_KTHREAD) == 0) {
return (EINVAL);
}
thread_lock(td);
td->td_flags |= TDF_KTH_SUSP;
thread_unlock(td);
/*
* If it's stopped for some other reason,
* kick it to notice our request
* or we'll end up timing out
*/
wakeup(td); /* traditional place for kernel threads to sleep on */ /* XXX ?? */
return (tsleep(&td->td_flags, PPAUSE | PDROP, "suspkt", timo));
}
/*
* let the kthread it can keep going again.
*/
int
kthread_resume(struct thread *td)
{
if ((td->td_pflags & TDP_KTHREAD) == 0) {
return (EINVAL);
}
thread_lock(td);
td->td_flags &= ~TDF_KTH_SUSP;
thread_unlock(td);
wakeup(&td->td_name);
return (0);
}
/*
* Used by the thread to poll as to whether it should yield/sleep
* and notify the caller that is has happened.
*/
void
kthread_suspend_check(struct thread *td)
{
while (td->td_flags & TDF_KTH_SUSP) {
/*
* let the caller know we got the message then sleep
*/
wakeup(&td->td_flags);
tsleep(&td->td_name, PPAUSE, "ktsusp", 0);
}
}
int
kproc_kthread_add(void (*func)(void *), void *arg,
struct proc **procptr, struct thread **tdptr,
int flags, int pages, char * procname, const char *fmt, ...)
{
int error;
va_list ap;
char buf[100];
struct thread *td;
if (*procptr == 0) {
error = kproc_create(func, arg,
procptr, flags, pages, "%s", procname);
if (error)
return (error);
td = FIRST_THREAD_IN_PROC(*procptr);
*tdptr = td;
va_start(ap, fmt);
vsnprintf(td->td_name, sizeof(td->td_name), fmt, ap);
va_end(ap);
return (0);
}
va_start(ap, fmt);
vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
error = kthread_add(func, arg, *procptr,
tdptr, flags, pages, "%s", buf);
return (error);
}

22
sys/kern/kern_shutdown.c
View File

@ -616,6 +616,28 @@ kproc_shutdown(void *arg, int howto)
printf("done\n");
}
void
kthread_shutdown(void *arg, int howto)
{
struct thread *td;
char procname[MAXCOMLEN + 1];
int error;
if (panicstr)
return;
td = (struct thread *)arg;
strlcpy(procname, td->td_name, sizeof(procname));
printf("Waiting (max %d seconds) for system thread `%s' to stop...",
kproc_shutdown_wait, procname);
error = kthread_suspend(td, kproc_shutdown_wait * hz);
if (error == EWOULDBLOCK)
printf("timed out\n");
else
printf("done\n");
}
/* Registration of dumpers */
int
set_dumper(struct dumperinfo *di)

6
sys/kern/kern_thread.c
View File

@ -657,12 +657,6 @@ thread_single(int mode)
sleepq_abort(td2, EINTR);
break;
case SINGLE_BOUNDARY:
if (TD_IS_SUSPENDED(td2) &&
!(td2->td_flags & TDF_BOUNDARY))
thread_unsuspend_one(td2);
if (TD_ON_SLEEPQ(td2) &&
(td2->td_flags & TDF_SINTR))
sleepq_abort(td2, ERESTART);
break;
default:
if (TD_IS_SUSPENDED(td2)) {

2
sys/kern/sched_4bsd.c
View File

@ -1367,11 +1367,9 @@ sched_tick(void)
void
sched_idletd(void *dummy)
{
struct proc *p;
struct thread *td;
td = curthread;
p = td->td_proc;
for (;;) {
mtx_assert(&Giant, MA_NOTOWNED);

29
sys/sys/kthread.h
View File

@ -42,13 +42,38 @@ struct kproc_desc {
struct proc **global_procpp; /* ptr to proc ptr save area */
};
void kproc_shutdown(void *, int);
void kproc_start(const void *);
/* A kernel thread descriptor; used to start "internal" daemons. */
struct kthread_desc {
char *arg0; /* arg 0 (for 'ps' listing) */
void (*func)(void); /* "main" for kernel thread */
struct thread **global_threadpp; /* ptr to thread ptr save area */
};
int kproc_create(void (*)(void *), void *, struct proc **,
int flags, int pages, const char *, ...) __printflike(6, 7);
void kproc_exit(int) __dead2;
int kproc_resume(struct proc *);
void kproc_shutdown(void *, int);
void kproc_start(const void *);
int kproc_suspend(struct proc *, int);
void kproc_suspend_check(struct proc *);
/* create a thread inthe given process. create the process if needed */
int kproc_kthread_add(void (*)(void *), void *,
struct proc **,
struct thread **,
int flags, int pages,
char * procname, const char *, ...) __printflike(8, 9);
int kthread_add(void (*)(void *), void *,
struct proc *, struct thread **,
int flags, int pages, const char *, ...) __printflike(7, 8);
void kthread_exit(int) __dead2;
int kthread_resume(struct thread *);
void kthread_shutdown(void *, int);
void kthread_start(const void *);
int kthread_suspend(struct thread *, int);
void kthread_suspend_check(struct thread *);
#endif /* !_SYS_KTHREAD_H_ */

5
sys/sys/proc.h
View File

@ -322,7 +322,7 @@ do { \
#define TDF_IDLETD 0x00000020 /* This is a per-CPU idle thread. */
#define TDF_SELECT 0x00000040 /* Selecting; wakeup/waiting danger. */
#define TDF_SLEEPABORT 0x00000080 /* sleepq_abort was called. */
#define TDF_UNUSEDx100 0x00000100 /* --available-- */
#define TDF_KTH_SUSP 0x00000100 /* kthread is suspended */
#define TDF_UBORROWING 0x00000200 /* Thread is borrowing user pri. */
#define TDF_BOUNDARY 0x00000400 /* Thread suspended at user boundary */
#define TDF_ASTPENDING 0x00000800 /* Thread has some asynchronous events. */
@ -348,7 +348,7 @@ do { \
/*
* "Private" flags kept in td_pflags:
* These are only accessed by curthread and thus need no locking.
* These are only written by curthread and thus need no locking.
*/
#define TDP_OLDMASK 0x00000001 /* Need to restore mask after suspend. */
#define TDP_INKTR 0x00000002 /* Thread is currently in KTR code. */
@ -371,6 +371,7 @@ do { \
#define TDP_NORUNNINGBUF 0x00040000 /* Ignore runningbufspace check */
#define TDP_WAKEUP 0x00080000 /* Don't sleep in umtx cond_wait */
#define TDP_INBDFLUSH 0x00100000 /* Already in BO_BDFLUSH, do not recurse */
#define TDP_KTHREAD 0x00200000 /* This is an official kernel thread */
/*
* Reasons that the current thread can not be run yet.

106
usr.bin/top/machine.c
View File

@ -737,56 +737,72 @@ format_next_process(caddr_t handle, char *(*get_userid)(int), int flags)
}
if (!(flags & FMT_SHOWARGS)) {
snprintf(cmdbuf, cmdlengthdelta, "%s", pp->ki_comm);
}
else if (pp->ki_args == NULL ||
(args = kvm_getargv(kd, pp, cmdlengthdelta)) == NULL || !(*args))
snprintf(cmdbuf, cmdlengthdelta, "[%s]", pp->ki_comm);
else {
char *src, *dst, *argbuf;
char *cmd;
size_t argbuflen;
size_t len;
argbuflen = cmdlengthdelta * 4;
argbuf = (char *)malloc(argbuflen + 1);
if (argbuf == NULL) {
warn("malloc(%d)", argbuflen + 1);
free(cmdbuf);
return NULL;
if (ps.thread && pp->ki_flag & P_HADTHREADS &&
pp->ki_ocomm[0]) {
snprintf(cmdbuf, cmdlengthdelta, "{%s}", pp->ki_ocomm);
} else {
snprintf(cmdbuf, cmdlengthdelta, "%s", pp->ki_comm);
}
} else {
if (pp->ki_flag & P_SYSTEM ||
pp->ki_args == NULL ||
(args = kvm_getargv(kd, pp, cmdlengthdelta)) == NULL ||
!(*args)) {
if (ps.thread && pp->ki_flag & P_HADTHREADS &&
pp->ki_ocomm[0]) {
snprintf(cmdbuf, cmdlengthdelta,
"{%s}", pp->ki_ocomm);
} else {
snprintf(cmdbuf, cmdlengthdelta,
"[%s]", pp->ki_comm);
}
} else {
char *src, *dst, *argbuf;
char *cmd;
size_t argbuflen;
size_t len;
dst = argbuf;
argbuflen = cmdlengthdelta * 4;
argbuf = (char *)malloc(argbuflen + 1);
if (argbuf == NULL) {
warn("malloc(%d)", argbuflen + 1);
free(cmdbuf);
return NULL;
}
/* Extract cmd name from argv */
cmd = strrchr(*args, '/');
if (cmd == NULL)
cmd = *args;
else
cmd++;
dst = argbuf;
for (; (src = *args++) != NULL; ) {
if (*src == '\0')
continue;
len = (argbuflen - (dst - argbuf) - 1) / 4;
strvisx(dst, src, strlen(src) < len ? strlen(src) : len,
VIS_NL | VIS_CSTYLE);
while (*dst != '\0')
dst++;
if ((argbuflen - (dst - argbuf) - 1) / 4 > 0)
*dst++ = ' '; /* add delimiting space */
/* Extract cmd name from argv */
cmd = strrchr(*args, '/');
if (cmd == NULL)
cmd = *args;
else
cmd++;
for (; (src = *args++) != NULL; ) {
if (*src == '\0')
continue;
len = (argbuflen - (dst - argbuf) - 1) / 4;
strvisx(dst, src,
strlen(src) < len ? strlen(src) : len,
VIS_NL | VIS_CSTYLE);
while (*dst != '\0')
dst++;
if ((argbuflen - (dst - argbuf) - 1) / 4 > 0)
*dst++ = ' '; /* add delimiting space */
}
if (dst != argbuf && dst[-1] == ' ')
dst--;
*dst = '\0';
if (strcmp(cmd, pp->ki_comm) != 0 )
snprintf(cmdbuf, cmdlengthdelta,
"%s (%s)",argbuf, pp->ki_comm);
else
strlcpy(cmdbuf, argbuf, cmdlengthdelta);
free(argbuf);
}
if (dst != argbuf && dst[-1] == ' ')
dst--;
*dst = '\0';
if (strcmp(cmd, pp->ki_comm) != 0 )
snprintf(cmdbuf, cmdlengthdelta, "%s (%s)",argbuf, \
pp->ki_comm);
else
strlcpy(cmdbuf, argbuf, cmdlengthdelta);
free(argbuf);
}
if (ps.jail == 0)