Remove TDP_USTATCLOCK, we no longer need it because we now always
update tick count for userland in thread_userret. This change also removes a "no upcall owned" panic because fuword() schedules an upcall under heavily loaded, and code assumes there is no upcall can occur. Reported and Tested by: Peter Holm <peter@holm.cc>
This commit is contained in:
David Xu
parent
5995adc206
commit
cf1867f932
@ -65,7 +65,7 @@ extern struct mtx kse_zombie_lock;
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TAILQ_HEAD(, kse_upcall) zombie_upcalls =
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TAILQ_HEAD_INITIALIZER(zombie_upcalls);
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static int thread_update_usr_ticks(struct thread *td, int user);
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static int thread_update_usr_ticks(struct thread *td);
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static void thread_alloc_spare(struct thread *td);
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/* move to proc.h */
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@ -818,7 +818,7 @@ thread_export_context(struct thread *td, int willexit)
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struct ksegrp *kg;
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uintptr_t mbx;
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void *addr;
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int error = 0, temp, sig;
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int error = 0, sig;
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mcontext_t mc;
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p = td->td_proc;
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@ -850,14 +850,6 @@ thread_export_context(struct thread *td, int willexit)
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if (error)
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goto bad;
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/* Exports clock ticks in kernel mode */
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addr = (caddr_t)(&td->td_mailbox->tm_sticks);
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temp = fuword32(addr) + td->td_usticks;
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if (suword32(addr, temp)) {
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error = EFAULT;
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goto bad;
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}
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addr = (caddr_t)(&td->td_mailbox->tm_lwp);
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if (suword32(addr, 0)) {
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error = EFAULT;
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@ -938,13 +930,11 @@ int
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thread_statclock(int user)
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{
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struct thread *td = curthread;
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struct ksegrp *kg = td->td_ksegrp;
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if (kg->kg_numupcalls == 0 || !(td->td_pflags & TDP_SA))
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if (!(td->td_pflags & TDP_SA))
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return (0);
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if (user) {
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/* Current always do via ast() */
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td->td_pflags |= TDP_USTATCLOCK;
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mtx_lock_spin(&sched_lock);
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td->td_flags |= TDF_ASTPENDING;
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mtx_unlock_spin(&sched_lock);
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@ -958,47 +948,34 @@ thread_statclock(int user)
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* Export state clock ticks for userland
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*/
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static int
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thread_update_usr_ticks(struct thread *td, int user)
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thread_update_usr_ticks(struct thread *td)
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{
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struct proc *p = td->td_proc;
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struct kse_thr_mailbox *tmbx;
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struct kse_upcall *ku;
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struct ksegrp *kg;
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caddr_t addr;
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u_int uticks;
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if ((ku = td->td_upcall) == NULL)
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if (td->td_mailbox == NULL)
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return (-1);
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if ((tmbx = td->td_mailbox) == NULL) {
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tmbx = (void *)fuword((void *)&ku->ku_mailbox->km_curthread);
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if ((tmbx == NULL) || (tmbx == (void *)-1))
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return (-1);
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}
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if (user) {
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uticks = td->td_uuticks;
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if ((uticks = td->td_uuticks) != 0) {
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td->td_uuticks = 0;
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addr = (caddr_t)&tmbx->tm_uticks;
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} else {
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uticks = td->td_usticks;
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addr = (caddr_t)&td->td_mailbox->tm_uticks;
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if (suword32(addr, uticks+fuword32(addr)))
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goto error;
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}
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if ((uticks = td->td_usticks) != 0) {
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td->td_usticks = 0;
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addr = (caddr_t)&tmbx->tm_sticks;
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}
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if (uticks) {
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if (suword32(addr, uticks+fuword32(addr))) {
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PROC_LOCK(p);
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psignal(p, SIGSEGV);
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PROC_UNLOCK(p);
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return (-2);
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}
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}
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kg = td->td_ksegrp;
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if (kg->kg_upquantum && ticks >= kg->kg_nextupcall) {
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mtx_lock_spin(&sched_lock);
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td->td_upcall->ku_flags |= KUF_DOUPCALL;
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mtx_unlock_spin(&sched_lock);
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addr = (caddr_t)&td->td_mailbox->tm_sticks;
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if (suword32(addr, uticks+fuword32(addr)))
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goto error;
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}
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return (0);
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error:
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PROC_LOCK(p);
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psignal(p, SIGSEGV);
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PROC_UNLOCK(p);
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return (-2);
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}
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/*
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@ -1222,25 +1199,24 @@ thread_userret(struct thread *td, struct trapframe *frame)
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struct timespec ts;
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int error = 0, upcalls, uts_crit;
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p = td->td_proc;
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kg = td->td_ksegrp;
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ku = td->td_upcall;
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/* Nothing to do with bound thread */
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if (!(td->td_pflags & TDP_SA))
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return (0);
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/*
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* Stat clock interrupt hit in userland, it
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* is returning from interrupt, charge thread's
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* userland time for UTS.
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* Update stat clock count for userland
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*/
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if (td->td_pflags & TDP_USTATCLOCK) {
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thread_update_usr_ticks(td, 1);
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td->td_pflags &= ~TDP_USTATCLOCK;
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if (td->td_mailbox != NULL) {
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thread_update_usr_ticks(td);
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uts_crit = 0;
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} else {
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uts_crit = 1;
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}
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uts_crit = (td->td_mailbox == NULL);
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p = td->td_proc;
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kg = td->td_ksegrp;
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ku = td->td_upcall;
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/*
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* Optimisation:
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* This thread has not started any upcall.
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@ -1253,7 +1229,6 @@ thread_userret(struct thread *td, struct trapframe *frame)
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(kg->kg_completed == NULL) &&
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(ku->ku_flags & KUF_DOUPCALL) == 0 &&
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(kg->kg_upquantum && ticks < kg->kg_nextupcall)) {
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thread_update_usr_ticks(td, 0);
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nanotime(&ts);
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error = copyout(&ts,
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(caddr_t)&ku->ku_mailbox->km_timeofday,
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@ -387,7 +387,6 @@ struct thread {
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#define TDP_SA 0x00000080 /* A scheduler activation based thread. */
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#define TDP_OWEPREEMPT 0x00000100 /* Thread has a pending preemption. */
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#define TDP_OWEUPC 0x00000200 /* Call addupc() at next AST. */
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#define TDP_USTATCLOCK 0x00000400 /* Finish user statclock hit at next AST. */
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#define TDP_CAN_UNBIND 0x00000800 /* Only temporarily bound. */
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#define TDP_SCHED1 0x00001000 /* Reserved for scheduler private use */
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#define TDP_SCHED2 0x00002000 /* Reserved for scheduler private use */
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