mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-24 11:29:10 +00:00
48bfcddd94
in specific situations. The owner thread must be blocked, and the borrower can not proceed back to user space with the borrowed KSE. The borrower will return the KSE on the next context switch where teh owner wants it back. This removes a lot of possible race conditions and deadlocks. It is consceivable that the borrower should inherit the priority of the owner too. that's another discussion and would be simple to do. Also, as part of this, the "preallocatd spare thread" is attached to the thread doing a syscall rather than the KSE. This removes the need to lock the scheduler when we want to access it, as it's now "at hand". DDB now shows a lot mor info for threaded proceses though it may need some optimisation to squeeze it all back into 80 chars again. (possible JKH project) Upcalls are now "bound" threads, but "KSE Lending" now means that other completing syscalls can be completed using that KSE before the upcall finally makes it back to the UTS. (getting threads OUT OF THE KERNEL is one of the highest priorities in the KSE system.) The upcall when it happens will present all the completed syscalls to the KSE for selection.
190 lines
4.9 KiB
C
190 lines
4.9 KiB
C
/*-
|
|
* Copyright (c) 1993 The Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/cons.h>
|
|
|
|
#include <ddb/ddb.h>
|
|
|
|
void
|
|
db_ps(dummy1, dummy2, dummy3, dummy4)
|
|
db_expr_t dummy1;
|
|
boolean_t dummy2;
|
|
db_expr_t dummy3;
|
|
char * dummy4;
|
|
{
|
|
int np;
|
|
int nl = 0;
|
|
volatile struct proc *p, *pp;
|
|
volatile struct thread *td;
|
|
char *state;
|
|
|
|
np = nprocs;
|
|
|
|
/* sx_slock(&allproc_lock); */
|
|
if (!LIST_EMPTY(&allproc))
|
|
p = LIST_FIRST(&allproc);
|
|
else
|
|
p = &proc0;
|
|
|
|
db_printf(" pid proc addr uid ppid pgrp flag stat wmesg wchan cmd\n");
|
|
while (--np >= 0) {
|
|
/*
|
|
* XXX just take 20 for now...
|
|
*/
|
|
if (nl++ == 20) {
|
|
int c;
|
|
|
|
db_printf("--More--");
|
|
c = cngetc();
|
|
db_printf("\r");
|
|
/*
|
|
* A whole screenfull or just one line?
|
|
*/
|
|
switch (c) {
|
|
case '\n': /* just one line */
|
|
nl = 20;
|
|
break;
|
|
case ' ':
|
|
nl = 0; /* another screenfull */
|
|
break;
|
|
default: /* exit */
|
|
db_printf("\n");
|
|
return;
|
|
}
|
|
}
|
|
if (p == NULL) {
|
|
printf("oops, ran out of processes early!\n");
|
|
break;
|
|
}
|
|
/* PROC_LOCK(p); */
|
|
pp = p->p_pptr;
|
|
if (pp == NULL)
|
|
pp = p;
|
|
|
|
|
|
switch(p->p_state) {
|
|
case PRS_NORMAL:
|
|
if (P_SHOULDSTOP(p))
|
|
state = "stop";
|
|
else
|
|
state = "norm";
|
|
break;
|
|
case PRS_NEW:
|
|
state = "new ";
|
|
break;
|
|
case PRS_WAIT:
|
|
state = "wait";
|
|
break;
|
|
case PRS_ZOMBIE:
|
|
state = "zomb";
|
|
break;
|
|
default:
|
|
state = "Unkn";
|
|
break;
|
|
}
|
|
db_printf("%5d %8p %8p %4d %5d %5d %07x %-4s",
|
|
p->p_pid, (volatile void *)p, (void *)p->p_uarea,
|
|
p->p_ucred != NULL ? p->p_ucred->cr_ruid : 0, pp->p_pid,
|
|
p->p_pgrp != NULL ? p->p_pgrp->pg_id : 0, p->p_flag,
|
|
state);
|
|
if (p->p_flag & P_KSES)
|
|
db_printf("(threaded) %s\n", p->p_comm);
|
|
FOREACH_THREAD_IN_PROC(p, td) {
|
|
if (p->p_flag & P_KSES)
|
|
db_printf( " thread %p ksegrp %p ", td, td->td_ksegrp);
|
|
if (TD_ON_SLEEPQ(td)) {
|
|
if (td->td_flags & TDF_CVWAITQ)
|
|
db_printf("[CVQ ");
|
|
else
|
|
db_printf("[SLPQ ");
|
|
db_printf(" %6s %8p]", td->td_wmesg,
|
|
(void *)td->td_wchan);
|
|
}
|
|
switch (td->td_state) {
|
|
case TDS_INHIBITED:
|
|
if (TD_ON_LOCK(td)) {
|
|
db_printf("[LOCK %6s %8p]",
|
|
td->td_lockname,
|
|
(void *)td->td_blocked);
|
|
}
|
|
if (TD_IS_SLEEPING(td)) {
|
|
db_printf("[SLP]");
|
|
}
|
|
if (TD_IS_SWAPPED(td)) {
|
|
db_printf("[SWAP]");
|
|
}
|
|
if (TD_IS_SUSPENDED(td)) {
|
|
db_printf("[SUSP]");
|
|
}
|
|
if (TD_AWAITING_INTR(td)) {
|
|
db_printf("[IWAIT]");
|
|
}
|
|
if (TD_LENT(td)) {
|
|
db_printf("[LOAN]");
|
|
}
|
|
break;
|
|
case TDS_CAN_RUN:
|
|
db_printf("[Can run]");
|
|
break;
|
|
case TDS_RUNQ:
|
|
db_printf("[RUNQ]");
|
|
break;
|
|
case TDS_RUNNING:
|
|
db_printf("[CPU %d]", td->td_kse->ke_oncpu);
|
|
break;
|
|
default:
|
|
panic("unknown thread state");
|
|
}
|
|
if (p->p_flag & P_KSES) {
|
|
if (td->td_kse)
|
|
db_printf("[kse %p]", td->td_kse);
|
|
db_printf("\n");
|
|
} else
|
|
db_printf(" %s\n", p->p_comm);
|
|
|
|
}
|
|
/* PROC_UNLOCK(p); */
|
|
|
|
p = LIST_NEXT(p, p_list);
|
|
if (p == NULL && np > 0)
|
|
p = LIST_FIRST(&zombproc);
|
|
}
|
|
/* sx_sunlock(&allproc_lock); */
|
|
}
|