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Index: vm/vm_fault.c
===================================================================
--- vm/vm_fault.c
+++ vm/vm_fault.c
@@ -132,7 +132,7 @@
static void vm_fault_dontneed(const struct faultstate *fs, vm_offset_t vaddr,
int ahead);
static void vm_fault_prefault(const struct faultstate *fs, vm_offset_t addra,
- int backward, int forward, bool obj_locked);
+ int backward, int forward, bool obj_locked, int faultcount);
static inline void
release_page(struct faultstate *fs)
@@ -323,7 +323,7 @@
vm_fault_fill_hold(m_hold, m);
vm_fault_dirty(fs->entry, m, prot, fault_type, fault_flags, false);
if (psind == 0 && !wired)
- vm_fault_prefault(fs, vaddr, PFBAK, PFFOR, true);
+ vm_fault_prefault(fs, vaddr, PFBAK, PFFOR, true, 0);
VM_OBJECT_RUNLOCK(fs->first_object);
vm_map_lookup_done(fs->map, fs->entry);
curthread->td_ru.ru_minflt++;
@@ -1181,6 +1181,9 @@
*/
vm_object_pip_wakeup(fs.object);
VM_OBJECT_WUNLOCK(fs.object);
+ if (faultcount == 0)
+ faultcount = -1;
+
/*
* Only use the new page below...
*/
@@ -1289,7 +1292,7 @@
wired == 0)
vm_fault_prefault(&fs, vaddr,
faultcount > 0 ? behind : PFBAK,
- faultcount > 0 ? ahead : PFFOR, false);
+ faultcount > 0 ? ahead : PFFOR, false, faultcount);
VM_OBJECT_WLOCK(fs.object);
vm_page_lock(fs.m);
@@ -1413,6 +1416,17 @@
VM_OBJECT_WUNLOCK(first_object);
}
+static SYSCTL_NODE(_debug, OID_AUTO, counters, CTLFLAG_RD, 0, "");
+
+static long counter_negati;
+SYSCTL_ULONG(_debug_counters, OID_AUTO, negati, CTLFLAG_RD, &counter_negati, 0, "");
+
+static long counter_nonneg;
+SYSCTL_ULONG(_debug_counters, OID_AUTO, nonneg, CTLFLAG_RD, &counter_nonneg, 0, "");
+
+static long counter_negmap;
+SYSCTL_ULONG(_debug_counters, OID_AUTO, negmap, CTLFLAG_RD, &counter_negmap, 0, "");
+
/*
* vm_fault_prefault provides a quick way of clustering
* pagefaults into a processes address space. It is a "cousin"
@@ -1421,7 +1435,7 @@
*/
static void
vm_fault_prefault(const struct faultstate *fs, vm_offset_t addra,
- int backward, int forward, bool obj_locked)
+ int backward, int forward, bool obj_locked, int faultcount)
{
pmap_t pmap;
vm_map_entry_t entry;
@@ -1462,6 +1476,10 @@
if (addr < starta || addr >= entry->end)
continue;
+ if (faultcount == -1)
+ atomic_add_long(&counter_negati, 1);
+ else
+ atomic_add_long(&counter_nonneg, 1);
if (!pmap_is_prefaultable(pmap, addr))
continue;
@@ -1486,8 +1504,11 @@
break;
}
if (m->valid == VM_PAGE_BITS_ALL &&
- (m->flags & PG_FICTITIOUS) == 0)
+ (m->flags & PG_FICTITIOUS) == 0) {
pmap_enter_quick(pmap, addr, m, entry->protection);
+ if (faultcount == -1)
+ atomic_add_long(&counter_negmap, 1);
+ }
if (!obj_locked || lobject != entry->object.vm_object)
VM_OBJECT_RUNLOCK(lobject);
}

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