Merge..i confused git somehow..

0ee57d47 · Silas Boyd-Wickizer · 156d2e74 · 4c59fc07 · 0ee57d47 · 0ee57d47
--- a/include/kalloc.hh
+++ b/include/kalloc.hh
@@ -72,4 +72,3 @@ enum {
 };

 extern percpu<kmem> kmems;
-extern percpu<kmem> slabmem[slab_type_max];
--- a/include/ns.hh
+++ b/include/ns.hh
@@ -102,7 +102,7 @@ class xns : public rcu_freed {

      e->next = root.load();
      if (cmpxch(&table[i].chain, e->next.load(), e)) {
-        int c = mycpuid();
+        int c = myid();
        acquire(&percore_lock[c]);
        e->percore_c = c;
        e->percore_next = percore[c].load();
@@ -180,7 +180,7 @@ class xns : public rcu_freed {
  template<class CB>
  void enumerate(CB cb) {
    scoped_gc_epoch gc;
-    int cpuoffset = mycpuid();
+    int cpuoffset = myid();
    for (int i = 0; i < NCPU; i++) {
      auto e = percore[(i + cpuoffset) % NCPU].load();
      while (e) {

--- a/include/percpu.hh
+++ b/include/percpu.hh
 #pragma once

-extern int mycpuid(void);
+#include "cpu.hh"

 template <typename T>
 struct percpu {
@@ -11,15 +11,15 @@ struct percpu {
  percpu &operator=(const percpu &o) = delete;

  T* get() const {
-    return cpu(mycpuid());
+    return cpu(myid());
  }

  T* operator->() const {
-    return cpu(mycpuid());
+    return cpu(myid());
  }

  T& operator*() const {
-    return *cpu(mycpuid());
+    return *cpu(myid());
  }

  T& operator[](int id) const {

--- a/include/radix.hh
+++ b/include/radix.hh
@@ -243,6 +243,8 @@ struct radix_iterator {
  }

  radix_elem* operator*() const {
+    // XXX(austin) If we don't hold a lock on this element, it's
+    // possible it will morph into a node under us.
    return path_[level_]->load().elem();
  }


--- a/include/wquser.hh
+++ b/include/wquser.hh
@@ -5,7 +5,6 @@
 #include "uwq.hh"
 #include "wqtypes.hh"

-int mycpuid(void);
 uwq_ipcbuf* allocipc(void);

 static inline void*

--- a/kernel/fs.cc
+++ b/kernel/fs.cc
@@ -191,7 +191,7 @@ ialloc(u32 dev, short type)
  struct superblock sb;

  readsb(dev, &sb);
-  for (int k = mycpuid()*IPB; k < sb.ninodes; k += (NCPU*IPB)) {
+  for (int k = myid()*IPB; k < sb.ninodes; k += (NCPU*IPB)) {
    for(int inum = k; inum < k+IPB && inum < sb.ninodes; inum++){
      if (inum == 0)
        continue;

--- a/kernel/futex.cc
+++ b/kernel/futex.cc
@@ -269,7 +269,4 @@ initfutex(void)
  nsfutex = new xns<futexkey_t, futexaddr*, futexkey_hash>(false);
  if (nsfutex == 0)
    panic("initfutex");
-
-  for (int i = 0; i < NCPU; i++)
-    new (&nscache_[i]) nscache();
 }
--- a/kernel/idle.cc
+++ b/kernel/idle.cc
@@ -149,9 +149,9 @@ initidle(void)
      assert((u16)ebx == 0x40);
    }
  }
-  
-  SLIST_INIT(&idlem[myid()].zombies);
-  initlock(&idlem[myid()].lock, "idle_lock", LOCKSTAT_IDLE);
+
+  SLIST_INIT(&idlem->zombies);
+  initlock(&idlem->lock, "idle_lock", LOCKSTAT_IDLE);

  snprintf(p->name, sizeof(p->name), "idle_%u", myid());
  mycpu()->proc = p;

--- a/kernel/main.cc
+++ b/kernel/main.cc
@@ -141,7 +141,7 @@ cmain(u64 mbmagic, u64 mbaddr)
  initmp();
  inittls();       // thread local storage

-  // Some global constructors require mycpu()->id (via mycpuid())
+  // Some global constructors require mycpu()->id (via myid())
  // which we setup in inittls
  extern const uptr sctors[], ectors[];
  for (const uptr *ctorva = ectors; ctorva > sctors; ) {

--- a/kernel/proc.cc
+++ b/kernel/proc.cc
@@ -21,12 +21,6 @@ proc::hash(const u32 &p)
  return p;
 }

-int
-mycpuid(void)
-{
-  return mycpu()->id;
-}
-
 xns<u32, proc*, proc::hash> *xnspid __mpalign__;
 struct proc *bootproc __mpalign__;


--- a/kernel/sched.cc
+++ b/kernel/sched.cc
@@ -339,9 +339,6 @@ statread(struct inode *inode, char *dst, u32 off, u32 n)
 void
 initsched(void)
 {
-  for (int i = 0; i < NCPU; i++)
-    new (&schedule_[i]) schedule();
-
  devsw[MAJ_STAT].write = nullptr;
  devsw[MAJ_STAT].read = statread;
 }
--- a/kernel/trap.cc
+++ b/kernel/trap.cc
@@ -174,7 +174,7 @@ trap(struct trapframe *tf)
    // In user space, assume process misbehaved.
    uerr.println("pid ", myproc()->pid, ' ', myproc()->name,
                 ": trap ", (u64)tf->trapno, " err ", (u32)tf->err,
-                 " on cpu ", mycpuid(), " rip ", shex(tf->rip),
+                 " on cpu ", myid(), " rip ", shex(tf->rip),
                 " rsp ", shex(tf->rsp), " addr ", shex(rcr2()),
                 "--kill proc");
    myproc()->killed = 1;
@@ -291,7 +291,8 @@ getcallerpcs(void *v, uptr pcs[], int n)
    if(rbp == 0 || rbp < (uptr*)KBASE || rbp == (uptr*)(~0UL) ||
       (rbp >= (uptr*)KBASEEND && rbp < (uptr*)KCODE))
      break;
-    pcs[i] = rbp[1];     // saved %rip
+    pcs[i] = rbp[1] - 1; // saved %rip; - 1 so it points to the call
+                         // instruction
    rbp = (uptr*)rbp[0]; // saved %rbp
  }
  for(; i < n; i++)

--- a/kernel/uwq.cc
+++ b/kernel/uwq.cc
@@ -28,7 +28,7 @@ uwq_trywork(void)
  for (i = 0; i < NCPU; i++) {
    u64 j = (i+k) % NCPU;

-    if (j == mycpuid())
+    if (j == myid())
      continue;
    struct cpu *c = &cpus[j];
    
@@ -199,7 +199,7 @@ uwq::tryworker(void)
      proc* p = w->proc_;

      acquire(&p->lock);
-      p->cpuid = mycpuid();
+      p->cpuid = myid();
      release(&p->lock);

      w->running_ = true;
@@ -226,7 +226,7 @@ again:
      w->running_ = true;

      acquire(&p->lock);
-      p->cpuid = mycpuid();
+      p->cpuid = myid();
      addrun(p);
      release(&p->lock);


--- a/kernel/vm.cc
+++ b/kernel/vm.cc
@@ -270,9 +270,9 @@ vmap::replace_vma(vma *a, vma *b)
  assert(a->vma_start == b->vma_start);
  assert(a->vma_end == b->vma_end);
  auto span = vmas.search_lock(a->vma_start, a->vma_end - a->vma_start);
+#if VM_CRANGE
  if (a->deleted())
    return false;
-#if VM_CRANGE
  for (auto e: span)
    assert(a == e);
  span.replace(b);
@@ -477,11 +477,6 @@ again:
    updatepages(pml4, e->vma_start, e->vma_end, [&needtlb](atomic<pme_t> *p) {
        for (;;) {
          pme_t v = p->load();
-          // XXX(austin) Huh?  Why is it okay to skip it if it's
-          // locked?  The page fault could be faulting in a page from
-          // the old VMA, in which case we need to shoot it down
-          // (though if it's already faulting a page from the new VMA,
-          // we need to *not* shoot it down).
          if (v & PTE_LOCK)
            continue;
          if (!(v & PTE_P))
@@ -623,7 +618,12 @@ vmap::pagefault(uptr va, u32 err)
  }

  scoped_gc_epoch gc;
+#if VM_CRANGE
  vma *m = lookup(va, 1);
+#elif VM_RADIX
+  auto vma_it = vmas.find(va);
+  vma *m = static_cast<vma*>(*vma_it);
+#endif
  if (m == 0)
    return -1;

@@ -664,10 +664,20 @@ vmap::pagefault(uptr va, u32 err)
  if (!cmpxch(pte, ptev, ptev | PTE_LOCK))
    goto retry;

+#if VM_CRANGE
  if (m->deleted()) {
    *pte = ptev;
    goto retry;
  }
+#elif VM_RADIX
+  // The radix tree is the source of truth about where the VMA is
+  // mapped.  It might have been unmapped from this va but still be
+  // around, so we can't just test if it's deleted.
+  if (*vma_it != m) {
+    *pte = ptev;
+    goto retry;
+  }
+#endif

  if (m->va_type == COW) {
    *pte = v2p(m->n->page[npg]) | PTE_P | PTE_U | PTE_COW;

--- a/kernel/wqkern.cc
+++ b/kernel/wqkern.cc
@@ -31,7 +31,7 @@ int
 wq_push(work *w)
 {
  assert(wq_);
-  return wq_->push(w, mycpuid());
+  return wq_->push(w, myid());
 }

 void

--- a/lib/wqlib.cc
+++ b/lib/wqlib.cc
@@ -158,7 +158,7 @@ wq::trywork(bool dosteal)
  // A "random" victim CPU
  k = rdtsc();

-  w = pop(mycpuid());
+  w = pop(myid());
  if (w != nullptr) {
    w->run();
    return 1;
@@ -170,7 +170,7 @@ wq::trywork(bool dosteal)
  for (i = 0; i < NCPU; i++) {
    u64 j = (i+k) % NCPU;

-    if (j == mycpuid())
+    if (j == myid())
        continue;
    
    w = steal(j);