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https://github.com/freebsd/freebsd-src
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- Use ksq_load as the authoritive count of kses on the pair of kseqs for
sched_runnable() et all. - Remove some dead code in sched_clock(). - Define two macros KSEQ_SELF() and KSEQ_CPU() for getting the kseq of the current cpu or some alternate cpu. - Start introducing kseq_() functions, such as kseq_choose() and kseq_setup().
This commit is contained in:
Jeff Roberson
parent
553f8de1dc
commit
0a016a05a4
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=110028
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@ -176,13 +176,34 @@ struct kseq {
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/*
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* One kse queue per processor.
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*/
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#ifdef SMP
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struct kseq kseq_cpu[MAXCPU];
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#define KSEQ_SELF() (&kseq_cpu[PCPU_GET(cpuid)])
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#define KSEQ_CPU(x) (&kseq_cpu[(x)])
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#else
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struct kseq kseq_cpu;
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#define KSEQ_SELF() (&kseq_cpu)
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#define KSEQ_CPU(x) (&kseq_cpu)
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#endif
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static int sched_slice(struct ksegrp *kg);
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static int sched_priority(struct ksegrp *kg);
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void sched_pctcpu_update(struct kse *ke);
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int sched_pickcpu(void);
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static struct kse * kseq_choose(struct kseq *kseq);
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static void kseq_setup(struct kseq *kseq);
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static void
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kseq_setup(struct kseq *kseq)
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{
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kseq->ksq_load = 0;
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kseq->ksq_curr = &kseq->ksq_runqs[0];
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kseq->ksq_next = &kseq->ksq_runqs[1];
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runq_init(kseq->ksq_curr);
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runq_init(kseq->ksq_next);
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}
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static void
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sched_setup(void *dummy)
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{
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@ -190,13 +211,8 @@ sched_setup(void *dummy)
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mtx_lock_spin(&sched_lock);
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/* init kseqs */
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for (i = 0; i < MAXCPU; i++) {
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kseq_cpu[i].ksq_load = 0;
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kseq_cpu[i].ksq_curr = &kseq_cpu[i].ksq_runqs[0];
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kseq_cpu[i].ksq_next = &kseq_cpu[i].ksq_runqs[1];
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runq_init(kseq_cpu[i].ksq_curr);
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runq_init(kseq_cpu[i].ksq_next);
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}
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for (i = 0; i < MAXCPU; i++)
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kseq_setup(KSEQ_CPU(i));
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mtx_unlock_spin(&sched_lock);
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}
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@ -281,22 +297,24 @@ sched_pctcpu_update(struct kse *ke)
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int
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sched_pickcpu(void)
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{
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int cpu;
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struct kseq *kseq;
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int load;
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int cpu;
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int i;
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if (!smp_started)
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return (0);
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cpu = PCPU_GET(cpuid);
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load = kseq_cpu[cpu].ksq_load;
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load = 0;
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cpu = 0;
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for (i = 0; i < mp_maxid; i++) {
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if (CPU_ABSENT(i))
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continue;
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if (kseq_cpu[i].ksq_load < load) {
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kseq = KSEQ_CPU(i);
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if (kseq->ksq_load < load) {
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cpu = i;
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load = kseq_cpu[i].ksq_load;
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load = kseq->ksq_load;
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}
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}
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@ -395,6 +413,10 @@ sched_sleep(struct thread *td, u_char prio)
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*/
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if (SCHED_CURR(td->td_kse->ke_ksegrp))
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td->td_kse->ke_runq = NULL;
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#if 0
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if (td->td_priority < PZERO)
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kseq_cpu[td->td_kse->ke_oncpu].ksq_load++;
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#endif
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}
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void
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@ -417,6 +439,10 @@ sched_wakeup(struct thread *td)
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td->td_priority = sched_priority(kg);
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}
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td->td_slptime = 0;
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#if 0
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if (td->td_priority < PZERO)
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kseq_cpu[td->td_kse->ke_oncpu].ksq_load--;
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#endif
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setrunqueue(td);
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if (td->td_priority < curthread->td_priority)
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curthread->td_kse->ke_flags |= KEF_NEEDRESCHED;
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@ -464,69 +490,47 @@ sched_fork(struct ksegrp *kg, struct ksegrp *child)
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void
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sched_exit(struct ksegrp *kg, struct ksegrp *child)
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{
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struct kseq *kseq;
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struct kse *ke;
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/* XXX Need something better here */
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mtx_assert(&sched_lock, MA_OWNED);
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kg->kg_slptime = child->kg_slptime;
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sched_priority(kg);
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/*
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* We drop the load here so that the running process leaves us with a
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* load of at least one.
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*/
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ke = FIRST_KSE_IN_KSEGRP(kg);
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kseq = &kseq_cpu[ke->ke_oncpu];
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}
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int sched_clock_switches;
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void
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sched_clock(struct thread *td)
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{
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struct kse *ke;
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#if 0
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struct kse *nke;
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#endif
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struct ksegrp *kg;
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struct kseq *kseq;
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int cpu;
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struct ksegrp *kg;
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cpu = PCPU_GET(cpuid);
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kseq = &kseq_cpu[cpu];
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mtx_assert(&sched_lock, MA_OWNED);
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KASSERT((td != NULL), ("schedclock: null thread pointer"));
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ke = td->td_kse;
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kg = td->td_ksegrp;
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mtx_assert(&sched_lock, MA_OWNED);
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KASSERT((td != NULL), ("schedclock: null thread pointer"));
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/* Adjust ticks for pctcpu */
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ke->ke_ticks += 10000;
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ke->ke_ltick = ticks;
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/* Go up to one second beyond our max and then trim back down */
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if (ke->ke_ftick + SCHED_CPU_TICKS + hz < ke->ke_ltick)
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sched_pctcpu_update(ke);
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if (td->td_kse->ke_flags & KEF_IDLEKSE) {
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#if 0
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if (nke && nke->ke_ksegrp->kg_pri_class == PRI_TIMESHARE) {
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printf("Idle running with %s on the runq!\n",
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nke->ke_proc->p_comm);
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Debugger("stop");
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}
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#endif
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if (td->td_kse->ke_flags & KEF_IDLEKSE)
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return;
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}
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#if 0
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/*
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* Check for a higher priority task on the run queue. This can happen
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* on SMP if another processor woke up a process on our runq.
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*/
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kseq = KSEQ_SELF();
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nke = runq_choose(kseq->ksq_curr);
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if (nke && nke->ke_thread &&
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nke->ke_thread->td_priority < td->td_priority) {
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sched_clock_switches++;
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nke->ke_thread->td_priority < td->td_priority)
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ke->ke_flags |= KEF_NEEDRESCHED;
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}
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#endif
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/*
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* We used a tick, decrease our total sleep time. This decreases our
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* "interactivity".
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@ -541,10 +545,6 @@ sched_clock(struct thread *td)
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* We're out of time, recompute priorities and requeue
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*/
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if (ke->ke_slice == 0) {
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struct kseq *kseq;
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kseq = &kseq_cpu[ke->ke_oncpu];
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td->td_priority = sched_priority(kg);
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ke->ke_slice = sched_slice(kg);
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ke->ke_flags |= KEF_NEEDRESCHED;
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@ -556,24 +556,24 @@ int
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sched_runnable(void)
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{
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struct kseq *kseq;
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int cpu;
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cpu = PCPU_GET(cpuid);
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kseq = &kseq_cpu[cpu];
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kseq = KSEQ_SELF();
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if (runq_check(kseq->ksq_curr))
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return (1);
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if (runq_check(kseq->ksq_next))
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if (kseq->ksq_load)
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return (1);
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#ifdef SMP
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/*
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* For SMP we may steal other processor's KSEs. Just search until we
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* verify that at least on other cpu has a runnable task.
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*/
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if (smp_started) {
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int i;
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for (i = 0; i < mp_maxid; i++) {
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if (CPU_ABSENT(i))
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continue;
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if (kseq_cpu[i].ksq_load && i != cpu)
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kseq = KSEQ_CPU(i);
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if (kseq->ksq_load)
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return (1);
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}
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}
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@ -595,10 +595,8 @@ sched_userret(struct thread *td)
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}
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}
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struct kse * sched_choose_kseq(struct kseq *kseq);
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struct kse *
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sched_choose_kseq(struct kseq *kseq)
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kseq_choose(struct kseq *kseq)
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{
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struct kse *ke;
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struct runq *swap;
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@ -616,46 +614,47 @@ sched_choose_kseq(struct kseq *kseq)
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struct kse *
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sched_choose(void)
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{
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struct kseq *kseq;
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struct kse *ke;
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int cpu;
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cpu = PCPU_GET(cpuid);
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ke = sched_choose_kseq(&kseq_cpu[cpu]);
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kseq = KSEQ_SELF();
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ke = kseq_choose(kseq);
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if (ke) {
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runq_remove(ke->ke_runq, ke);
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kseq->ksq_load--;
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ke->ke_state = KES_THREAD;
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#ifdef SMP
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kseq_cpu[cpu].ksq_load--;
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#endif
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}
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#ifdef SMP
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if (ke == NULL && smp_started) {
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int load;
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int me;
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int cpu;
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int i;
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me = cpu;
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load = 0;
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cpu = 0;
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/*
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* Find the cpu with the highest load and steal one proc.
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*/
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for (load = 0, i = 0; i < mp_maxid; i++) {
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if (CPU_ABSENT(i) || i == me)
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for (i = 0; i < mp_maxid; i++) {
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if (CPU_ABSENT(i))
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continue;
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if (kseq_cpu[i].ksq_load > load) {
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load = kseq_cpu[i].ksq_load;
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kseq = KSEQ_CPU(i);
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if (kseq->ksq_load > load) {
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load = kseq->ksq_load;
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cpu = i;
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}
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}
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if (load) {
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ke = sched_choose_kseq(&kseq_cpu[cpu]);
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kseq_cpu[cpu].ksq_load--;
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kseq = KSEQ_CPU(cpu);
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ke = kseq_choose(kseq);
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kseq->ksq_load--;
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ke->ke_state = KES_THREAD;
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runq_remove(ke->ke_runq, ke);
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ke->ke_runq = NULL;
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ke->ke_oncpu = me;
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ke->ke_oncpu = PCPU_GET(cpuid);
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}
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}
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@ -681,7 +680,7 @@ sched_add(struct kse *ke)
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if (ke->ke_runq == NULL) {
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struct kseq *kseq;
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kseq = &kseq_cpu[ke->ke_oncpu];
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kseq = KSEQ_CPU(ke->ke_oncpu);
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if (SCHED_CURR(ke->ke_ksegrp))
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ke->ke_runq = kseq->ksq_curr;
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else
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@ -691,9 +690,7 @@ sched_add(struct kse *ke)
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ke->ke_state = KES_ONRUNQ;
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runq_add(ke->ke_runq, ke);
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#ifdef SMP
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kseq_cpu[ke->ke_oncpu].ksq_load++;
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#endif
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KSEQ_CPU(ke->ke_oncpu)->ksq_load++;
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}
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void
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@ -706,9 +703,7 @@ sched_rem(struct kse *ke)
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ke->ke_runq = NULL;
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ke->ke_state = KES_THREAD;
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ke->ke_ksegrp->kg_runq_kses--;
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#ifdef SMP
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kseq_cpu[ke->ke_oncpu].ksq_load--;
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#endif
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KSEQ_CPU(ke->ke_oncpu)->ksq_load--;
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}
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fixpt_t
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