Author: alc
Date: Wed May 26 18:00:44 2010
New Revision: 208574
URL: http://svn.freebsd.org/changeset/base/208574
Log:
Push down page queues lock acquisition in pmap_enter_object() and
pmap_is_referenced(). Eliminate the corresponding page queues lock
acquisitions from vm_map_pmap_enter() and mincore(), respectively. In
mincore(), this allows some additional cases to complete without ever
acquiring the page queues lock.
Assert that the page is managed in pmap_is_referenced().
On powerpc/aim, push down the page queues lock acquisition from
moea*_is_modified() and moea*_is_referenced() into moea*_query_bit().
Again, this will allow some additional cases to complete without ever
acquiring the page queues lock.
Reorder a few statements in vm_page_dontneed() so that a race can't lead
to an old reference persisting. This scenario is described in detail by a
comment.
Correct a spelling error in vm_page_dontneed().
Assert that the object is locked in vm_page_clear_dirty(), and restrict the
page queues lock assertion to just those cases in which the page is
currently writeable.
Add object locking to vnode_pager_generic_putpages(). This was the one
and only place where vm_page_clear_dirty() was being called without the
object being locked.
Eliminate an unnecessary vm_page_lock() around vnode_pager_setsize()'s call
to vm_page_clear_dirty().
Change vnode_pager_generic_putpages() to the modern-style of function
definition. Also, change the name of one of the parameters to follow
virtual memory system naming conventions.
Reviewed by: kib
Modified:
head/sys/amd64/amd64/pmap.c
head/sys/arm/arm/pmap.c
head/sys/i386/i386/pmap.c
head/sys/i386/xen/pmap.c
head/sys/ia64/ia64/pmap.c
head/sys/mips/mips/pmap.c
head/sys/powerpc/aim/mmu_oea.c
head/sys/powerpc/aim/mmu_oea64.c
head/sys/powerpc/booke/pmap.c
head/sys/sparc64/sparc64/pmap.c
head/sys/sun4v/sun4v/pmap.c
head/sys/vm/vm_map.c
head/sys/vm/vm_mmap.c
head/sys/vm/vm_page.c
head/sys/vm/vnode_pager.c
Modified: head/sys/amd64/amd64/pmap.c
==============================================================================
--- head/sys/amd64/amd64/pmap.c Wed May 26 17:30:19 2010 (r208573)
+++ head/sys/amd64/amd64/pmap.c Wed May 26 18:00:44 2010 (r208574)
@@ -3389,6 +3389,7 @@ pmap_enter_object(pmap_t pmap, vm_offset
psize = atop(end - start);
mpte = NULL;
m = m_start;
+ vm_page_lock_queues();
PMAP_LOCK(pmap);
while (m != NULL && (diff = m->pindex - m_start->pindex) < psize) {
va = start + ptoa(diff);
@@ -3402,6 +3403,7 @@ pmap_enter_object(pmap_t pmap, vm_offset
mpte);
m = TAILQ_NEXT(m, listq);
}
+ vm_page_unlock_queues();
PMAP_UNLOCK(pmap);
}
@@ -4209,12 +4211,15 @@ pmap_is_prefaultable(pmap_t pmap, vm_off
boolean_t
pmap_is_referenced(vm_page_t m)
{
+ boolean_t rv;
- if (m->flags & PG_FICTITIOUS)
- return (FALSE);
- if (pmap_is_referenced_pvh(&m->md))
- return (TRUE);
- return (pmap_is_referenced_pvh(pa_to_pvh(VM_PAGE_TO_PHYS(m))));
+ KASSERT((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) == 0,
+ ("pmap_is_referenced: page %p is not managed", m));
+ vm_page_lock_queues();
+ rv = pmap_is_referenced_pvh(&m->md) ||
+ pmap_is_referenced_pvh(pa_to_pvh(VM_PAGE_TO_PHYS(m)));
+ vm_page_unlock_queues();
+ return (rv);
}
/*
Modified: head/sys/arm/arm/pmap.c
==============================================================================
--- head/sys/arm/arm/pmap.c Wed May 26 17:30:19 2010 (r208573)
+++ head/sys/arm/arm/pmap.c Wed May 26 18:00:44 2010 (r208574)
@@ -3589,12 +3589,14 @@ pmap_enter_object(pmap_t pmap, vm_offset
psize = atop(end - start);
m = m_start;
+ vm_page_lock_queues();
PMAP_LOCK(pmap);
while (m != NULL && (diff = m->pindex - m_start->pindex) < psize) {
pmap_enter_locked(pmap, start + ptoa(diff), m, prot &
(VM_PROT_READ | VM_PROT_EXECUTE), FALSE, M_NOWAIT);
m = TAILQ_NEXT(m, listq);
}
+ vm_page_unlock_queues();
PMAP_UNLOCK(pmap);
}
@@ -4521,8 +4523,9 @@ boolean_t
pmap_is_referenced(vm_page_t m)
{
- return ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) == 0 &&
- (m->md.pvh_attrs & PVF_REF) != 0);
+ KASSERT((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) == 0,
+ ("pmap_is_referenced: page %p is not managed", m));
+ return ((m->md.pvh_attrs & PVF_REF) != 0);
}
/*
Modified: head/sys/i386/i386/pmap.c
==============================================================================
--- head/sys/i386/i386/pmap.c Wed May 26 17:30:19 2010 (r208573)
+++ head/sys/i386/i386/pmap.c Wed May 26 18:00:44 2010 (r208574)
@@ -3519,6 +3519,7 @@ pmap_enter_object(pmap_t pmap, vm_offset
psize = atop(end - start);
mpte = NULL;
m = m_start;
+ vm_page_lock_queues();
PMAP_LOCK(pmap);
while (m != NULL && (diff = m->pindex - m_start->pindex) < psize) {
va = start + ptoa(diff);
@@ -3532,6 +3533,7 @@ pmap_enter_object(pmap_t pmap, vm_offset
mpte);
m = TAILQ_NEXT(m, listq);
}
+ vm_page_unlock_queues();
PMAP_UNLOCK(pmap);
}
@@ -4377,12 +4379,15 @@ pmap_is_prefaultable(pmap_t pmap, vm_off
boolean_t
pmap_is_referenced(vm_page_t m)
{
+ boolean_t rv;
- if (m->flags & PG_FICTITIOUS)
- return (FALSE);
- if (pmap_is_referenced_pvh(&m->md))
- return (TRUE);
- return (pmap_is_referenced_pvh(pa_to_pvh(VM_PAGE_TO_PHYS(m))));
+ KASSERT((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) == 0,
+ ("pmap_is_referenced: page %p is not managed", m));
+ vm_page_lock_queues();
+ rv = pmap_is_referenced_pvh(&m->md) ||
+ pmap_is_referenced_pvh(pa_to_pvh(VM_PAGE_TO_PHYS(m)));
+ vm_page_unlock_queues();
+ return (rv);
}
/*
Modified: head/sys/i386/xen/pmap.c
==============================================================================
--- head/sys/i386/xen/pmap.c Wed May 26 17:30:19 2010 (r208573)
+++ head/sys/i386/xen/pmap.c Wed May 26 18:00:44 2010 (r208574)
@@ -2901,6 +2901,7 @@ pmap_enter_object(pmap_t pmap, vm_offset
mpte = NULL;
m = m_start;
+ vm_page_lock_queues();
PMAP_LOCK(pmap);
while (m != NULL && (diff = m->pindex - m_start->pindex) < psize) {
mpte = pmap_enter_quick_locked(&mclp, &count, pmap, start +
ptoa(diff), m,
@@ -2917,7 +2918,7 @@ pmap_enter_object(pmap_t pmap, vm_offset
error = HYPERVISOR_multicall(mcl, count);
KASSERT(error == 0, ("bad multicall %d", error));
}
-
+ vm_page_unlock_queues();
PMAP_UNLOCK(pmap);
}
@@ -3734,11 +3735,11 @@ pmap_is_referenced(vm_page_t m)
pmap_t pmap;
boolean_t rv;
+ KASSERT((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) == 0,
+ ("pmap_is_referenced: page %p is not managed", m));
rv = FALSE;
- if (m->flags & PG_FICTITIOUS)
- return (rv);
+ vm_page_lock_queues();
sched_pin();
- mtx_assert(&vm_page_queue_mtx, MA_OWNED);
TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) {
pmap = PV_PMAP(pv);
PMAP_LOCK(pmap);
@@ -3751,6 +3752,7 @@ pmap_is_referenced(vm_page_t m)
if (*PMAP1)
PT_SET_MA(PADDR1, 0);
sched_unpin();
+ vm_page_unlock_queues();
return (rv);
}
Modified: head/sys/ia64/ia64/pmap.c
==============================================================================
--- head/sys/ia64/ia64/pmap.c Wed May 26 17:30:19 2010 (r208573)
+++ head/sys/ia64/ia64/pmap.c Wed May 26 18:00:44 2010 (r208574)
@@ -1625,12 +1625,14 @@ pmap_enter_object(pmap_t pmap, vm_offset
VM_OBJECT_LOCK_ASSERT(m_start->object, MA_OWNED);
psize = atop(end - start);
m = m_start;
+ vm_page_lock_queues();
PMAP_LOCK(pmap);
oldpmap = pmap_switch(pmap);
while (m != NULL && (diff = m->pindex - m_start->pindex) < psize) {
pmap_enter_quick_locked(pmap, start + ptoa(diff), m, prot);
m = TAILQ_NEXT(m, listq);
}
+ vm_page_unlock_queues();
pmap_switch(oldpmap);
PMAP_UNLOCK(pmap);
}
@@ -2041,9 +2043,10 @@ pmap_is_referenced(vm_page_t m)
pv_entry_t pv;
boolean_t rv;
+ KASSERT((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) == 0,
+ ("pmap_is_referenced: page %p is not managed", m));
rv = FALSE;
- if (m->flags & PG_FICTITIOUS)
- return (rv);
+ vm_page_lock_queues();
TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) {
PMAP_LOCK(pv->pv_pmap);
oldpmap = pmap_switch(pv->pv_pmap);
@@ -2055,6 +2058,7 @@ pmap_is_referenced(vm_page_t m)
if (rv)
break;
}
+ vm_page_unlock_queues();
return (rv);
}
Modified: head/sys/mips/mips/pmap.c
==============================================================================
--- head/sys/mips/mips/pmap.c Wed May 26 17:30:19 2010 (r208573)
+++ head/sys/mips/mips/pmap.c Wed May 26 18:00:44 2010 (r208574)
@@ -2130,12 +2130,14 @@ pmap_enter_object(pmap_t pmap, vm_offset
psize = atop(end - start);
mpte = NULL;
m = m_start;
+ vm_page_lock_queues();
PMAP_LOCK(pmap);
while (m != NULL && (diff = m->pindex - m_start->pindex) < psize) {
mpte = pmap_enter_quick_locked(pmap, start + ptoa(diff), m,
prot, mpte);
m = TAILQ_NEXT(m, listq);
}
+ vm_page_unlock_queues();
PMAP_UNLOCK(pmap);
}
@@ -2671,8 +2673,9 @@ boolean_t
pmap_is_referenced(vm_page_t m)
{
- return ((m->flags & PG_FICTITIOUS) == 0 &&
- (m->md.pv_flags & PV_TABLE_REF) != 0);
+ KASSERT((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) == 0,
+ ("pmap_is_referenced: page %p is not managed", m));
+ return ((m->md.pv_flags & PV_TABLE_REF) != 0);
}
/*
Modified: head/sys/powerpc/aim/mmu_oea.c
==============================================================================
--- head/sys/powerpc/aim/mmu_oea.c Wed May 26 17:30:19 2010
(r208573)
+++ head/sys/powerpc/aim/mmu_oea.c Wed May 26 18:00:44 2010
(r208574)
@@ -1197,12 +1197,14 @@ moea_enter_object(mmu_t mmu, pmap_t pm,
psize = atop(end - start);
m = m_start;
+ vm_page_lock_queues();
PMAP_LOCK(pm);
while (m != NULL && (diff = m->pindex - m_start->pindex) < psize) {
moea_enter_locked(pm, start + ptoa(diff), m, prot &
(VM_PROT_READ | VM_PROT_EXECUTE), FALSE);
m = TAILQ_NEXT(m, listq);
}
+ vm_page_unlock_queues();
PMAP_UNLOCK(pm);
}
@@ -1282,15 +1284,14 @@ boolean_t
moea_is_referenced(mmu_t mmu, vm_page_t m)
{
- if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) != 0)
- return (FALSE);
+ KASSERT((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) == 0,
+ ("moea_is_referenced: page %p is not managed", m));
return (moea_query_bit(m, PTE_REF));
}
boolean_t
moea_is_modified(mmu_t mmu, vm_page_t m)
{
- boolean_t rv;
KASSERT((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) == 0,
("moea_is_modified: page %p is not managed", m));
@@ -1304,10 +1305,7 @@ moea_is_modified(mmu_t mmu, vm_page_t m)
if ((m->oflags & VPO_BUSY) == 0 &&
(m->flags & PG_WRITEABLE) == 0)
return (FALSE);
- vm_page_lock_queues();
- rv = moea_query_bit(m, PTE_CHG);
- vm_page_unlock_queues();
- return (rv);
+ return (moea_query_bit(m, PTE_CHG));
}
void
@@ -2268,6 +2266,7 @@ moea_query_bit(vm_page_t m, int ptebit)
if (moea_attr_fetch(m) & ptebit)
return (TRUE);
+ vm_page_lock_queues();
LIST_FOREACH(pvo, vm_page_to_pvoh(m), pvo_vlink) {
MOEA_PVO_CHECK(pvo); /* sanity check */
@@ -2278,6 +2277,7 @@ moea_query_bit(vm_page_t m, int ptebit)
if (pvo->pvo_pte.pte.pte_lo & ptebit) {
moea_attr_save(m, ptebit);
MOEA_PVO_CHECK(pvo); /* sanity check */
+ vm_page_unlock_queues();
return (TRUE);
}
}
@@ -2303,11 +2303,13 @@ moea_query_bit(vm_page_t m, int ptebit)
if (pvo->pvo_pte.pte.pte_lo & ptebit) {
moea_attr_save(m, ptebit);
MOEA_PVO_CHECK(pvo); /* sanity check */
+ vm_page_unlock_queues();
return (TRUE);
}
}
}
+ vm_page_unlock_queues();
return (FALSE);
}
Modified: head/sys/powerpc/aim/mmu_oea64.c
==============================================================================
--- head/sys/powerpc/aim/mmu_oea64.c Wed May 26 17:30:19 2010
(r208573)
+++ head/sys/powerpc/aim/mmu_oea64.c Wed May 26 18:00:44 2010
(r208574)
@@ -1330,12 +1330,14 @@ moea64_enter_object(mmu_t mmu, pmap_t pm
psize = atop(end - start);
m = m_start;
+ vm_page_lock_queues();
PMAP_LOCK(pm);
while (m != NULL && (diff = m->pindex - m_start->pindex) < psize) {
moea64_enter_locked(pm, start + ptoa(diff), m, prot &
(VM_PROT_READ | VM_PROT_EXECUTE), FALSE);
m = TAILQ_NEXT(m, listq);
}
+ vm_page_unlock_queues();
PMAP_UNLOCK(pm);
}
@@ -1477,15 +1479,14 @@ boolean_t
moea64_is_referenced(mmu_t mmu, vm_page_t m)
{
- if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) != 0)
- return (FALSE);
+ KASSERT((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) == 0,
+ ("moea64_is_referenced: page %p is not managed", m));
return (moea64_query_bit(m, PTE_REF));
}
boolean_t
moea64_is_modified(mmu_t mmu, vm_page_t m)
{
- boolean_t rv;
KASSERT((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) == 0,
("moea64_is_modified: page %p is not managed", m));
@@ -1499,10 +1500,7 @@ moea64_is_modified(mmu_t mmu, vm_page_t
if ((m->oflags & VPO_BUSY) == 0 &&
(m->flags & PG_WRITEABLE) == 0)
return (FALSE);
- vm_page_lock_queues();
- rv = moea64_query_bit(m, LPTE_CHG);
- vm_page_unlock_queues();
- return (rv);
+ return (moea64_query_bit(m, LPTE_CHG));
}
void
@@ -2394,7 +2392,7 @@ moea64_query_bit(vm_page_t m, u_int64_t
if (moea64_attr_fetch(m) & ptebit)
return (TRUE);
- mtx_assert(&vm_page_queue_mtx, MA_OWNED);
+ vm_page_lock_queues();
LIST_FOREACH(pvo, vm_page_to_pvoh(m), pvo_vlink) {
MOEA_PVO_CHECK(pvo); /* sanity check */
@@ -2406,6 +2404,7 @@ moea64_query_bit(vm_page_t m, u_int64_t
if (pvo->pvo_pte.lpte.pte_lo & ptebit) {
moea64_attr_save(m, ptebit);
MOEA_PVO_CHECK(pvo); /* sanity check */
+ vm_page_unlock_queues();
return (TRUE);
}
}
@@ -2433,12 +2432,14 @@ moea64_query_bit(vm_page_t m, u_int64_t
moea64_attr_save(m, ptebit);
MOEA_PVO_CHECK(pvo); /* sanity check */
+ vm_page_unlock_queues();
return (TRUE);
}
}
UNLOCK_TABLE();
}
+ vm_page_unlock_queues();
return (FALSE);
}
Modified: head/sys/powerpc/booke/pmap.c
==============================================================================
--- head/sys/powerpc/booke/pmap.c Wed May 26 17:30:19 2010
(r208573)
+++ head/sys/powerpc/booke/pmap.c Wed May 26 18:00:44 2010
(r208574)
@@ -1711,12 +1711,14 @@ mmu_booke_enter_object(mmu_t mmu, pmap_t
psize = atop(end - start);
m = m_start;
+ vm_page_lock_queues();
PMAP_LOCK(pmap);
while (m != NULL && (diff = m->pindex - m_start->pindex) < psize) {
mmu_booke_enter_locked(mmu, pmap, start + ptoa(diff), m,
prot & (VM_PROT_READ | VM_PROT_EXECUTE), FALSE);
m = TAILQ_NEXT(m, listq);
}
+ vm_page_unlock_queues();
PMAP_UNLOCK(pmap);
}
@@ -2209,19 +2211,22 @@ mmu_booke_is_referenced(mmu_t mmu, vm_pa
pv_entry_t pv;
boolean_t rv;
- mtx_assert(&vm_page_queue_mtx, MA_OWNED);
+ KASSERT((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) == 0,
+ ("mmu_booke_is_referenced: page %p is not managed", m));
rv = FALSE;
- if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) != 0)
- return (rv);
+ vm_page_lock_queues();
TAILQ_FOREACH(pv, &m->md.pv_list, pv_link) {
PMAP_LOCK(pv->pv_pmap);
if ((pte = pte_find(mmu, pv->pv_pmap, pv->pv_va)) != NULL &&
- PTE_ISVALID(pte))
- rv = PTE_ISREFERENCED(pte) ? TRUE : FALSE;
+ PTE_ISVALID(pte)) {
+ if (PTE_ISREFERENCED(pte))
+ rv = TRUE;
+ }
PMAP_UNLOCK(pv->pv_pmap);
if (rv)
break;
}
+ vm_page_unlock_queues();
return (rv);
}
Modified: head/sys/sparc64/sparc64/pmap.c
==============================================================================
--- head/sys/sparc64/sparc64/pmap.c Wed May 26 17:30:19 2010
(r208573)
+++ head/sys/sparc64/sparc64/pmap.c Wed May 26 18:00:44 2010
(r208574)
@@ -1492,12 +1492,14 @@ pmap_enter_object(pmap_t pm, vm_offset_t
psize = atop(end - start);
m = m_start;
+ vm_page_lock_queues();
PMAP_LOCK(pm);
while (m != NULL && (diff = m->pindex - m_start->pindex) < psize) {
pmap_enter_locked(pm, start + ptoa(diff), m, prot &
(VM_PROT_READ | VM_PROT_EXECUTE), FALSE);
m = TAILQ_NEXT(m, listq);
}
+ vm_page_unlock_queues();
PMAP_UNLOCK(pm);
}
@@ -1947,17 +1949,22 @@ boolean_t
pmap_is_referenced(vm_page_t m)
{
struct tte *tp;
+ boolean_t rv;
- mtx_assert(&vm_page_queue_mtx, MA_OWNED);
- if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) != 0)
- return (FALSE);
+ KASSERT((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) == 0,
+ ("pmap_is_referenced: page %p is not managed", m));
+ rv = FALSE;
+ vm_page_lock_queues();
TAILQ_FOREACH(tp, &m->md.tte_list, tte_link) {
if ((tp->tte_data & TD_PV) == 0)
continue;
- if ((tp->tte_data & TD_REF) != 0)
- return (TRUE);
+ if ((tp->tte_data & TD_REF) != 0) {
+ rv = TRUE;
+ break;
+ }
}
- return (FALSE);
+ vm_page_unlock_queues();
+ return (rv);
}
void
Modified: head/sys/sun4v/sun4v/pmap.c
==============================================================================
--- head/sys/sun4v/sun4v/pmap.c Wed May 26 17:30:19 2010 (r208573)
+++ head/sys/sun4v/sun4v/pmap.c Wed May 26 18:00:44 2010 (r208574)
@@ -1221,11 +1221,13 @@ pmap_enter_object(pmap_t pmap, vm_offset
VM_OBJECT_LOCK_ASSERT(m_start->object, MA_OWNED);
psize = atop(end - start);
m = m_start;
+ vm_page_lock_queues();
PMAP_LOCK(pmap);
while (m != NULL && (diff = m->pindex - m_start->pindex) < psize) {
pmap_enter_quick_locked(pmap, start + ptoa(diff), m, prot);
m = TAILQ_NEXT(m, listq);
}
+ vm_page_unlock_queues();
PMAP_UNLOCK(pmap);
}
@@ -1642,8 +1644,14 @@ pmap_is_prefaultable(pmap_t pmap, vm_off
boolean_t
pmap_is_referenced(vm_page_t m)
{
+ boolean_t rv;
- return (tte_get_phys_bit(m, VTD_REF));
+ KASSERT((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) == 0,
+ ("pmap_is_referenced: page %p is not managed", m));
+ vm_page_lock_queues();
+ rv = tte_get_phys_bit(m, VTD_REF);
+ vm_page_unlock_queues();
+ return (rv);
}
/*
Modified: head/sys/vm/vm_map.c
==============================================================================
--- head/sys/vm/vm_map.c Wed May 26 17:30:19 2010 (r208573)
+++ head/sys/vm/vm_map.c Wed May 26 18:00:44 2010 (r208574)
@@ -1726,7 +1726,6 @@ vm_map_pmap_enter(vm_map_t map, vm_offse
vm_offset_t start;
vm_page_t p, p_start;
vm_pindex_t psize, tmpidx;
- boolean_t are_queues_locked;
if ((prot & (VM_PROT_READ | VM_PROT_EXECUTE)) == 0 || object == NULL)
return;
@@ -1748,7 +1747,6 @@ vm_map_pmap_enter(vm_map_t map, vm_offse
psize = object->size - pindex;
}
- are_queues_locked = FALSE;
start = 0;
p_start = NULL;
@@ -1782,25 +1780,14 @@ vm_map_pmap_enter(vm_map_t map, vm_offse
p_start = p;
}
} else if (p_start != NULL) {
- if (!are_queues_locked) {
- are_queues_locked = TRUE;
- vm_page_lock_queues();
- }
pmap_enter_object(map->pmap, start, addr +
ptoa(tmpidx), p_start, prot);
p_start = NULL;
}
}
- if (p_start != NULL) {
- if (!are_queues_locked) {
- are_queues_locked = TRUE;
- vm_page_lock_queues();
- }
+ if (p_start != NULL)
pmap_enter_object(map->pmap, start, addr + ptoa(psize),
p_start, prot);
- }
- if (are_queues_locked)
- vm_page_unlock_queues();
unlock_return:
VM_OBJECT_UNLOCK(object);
}
Modified: head/sys/vm/vm_mmap.c
==============================================================================
--- head/sys/vm/vm_mmap.c Wed May 26 17:30:19 2010 (r208573)
+++ head/sys/vm/vm_mmap.c Wed May 26 18:00:44 2010 (r208574)
@@ -912,11 +912,18 @@ RestartScan:
vm_page_dirty(m);
if (m->dirty != 0)
mincoreinfo |= MINCORE_MODIFIED_OTHER;
- vm_page_lock_queues();
+ /*
+ * The first test for PG_REFERENCED is an
+ * optimization. The second test is
+ * required because a concurrent pmap
+ * operation could clear the last reference
+ * and set PG_REFERENCED before the call to
+ * pmap_is_referenced().
+ */
if ((m->flags & PG_REFERENCED) != 0 ||
- pmap_is_referenced(m))
+ pmap_is_referenced(m) ||
+ (m->flags & PG_REFERENCED) != 0)
mincoreinfo |= MINCORE_REFERENCED_OTHER;
- vm_page_unlock_queues();
}
if (object != NULL)
VM_OBJECT_UNLOCK(object);
Modified: head/sys/vm/vm_page.c
==============================================================================
--- head/sys/vm/vm_page.c Wed May 26 17:30:19 2010 (r208573)
+++ head/sys/vm/vm_page.c Wed May 26 18:00:44 2010 (r208574)
@@ -1894,7 +1894,7 @@ vm_page_dontneed(vm_page_t m)
PCPU_INC(dnweight);
/*
- * occassionally leave the page alone
+ * Occasionally leave the page alone.
*/
if ((dnw & 0x01F0) == 0 ||
VM_PAGE_INQUEUE2(m, PQ_INACTIVE)) {
@@ -1906,11 +1906,18 @@ vm_page_dontneed(vm_page_t m)
/*
* Clear any references to the page. Otherwise, the page daemon will
* immediately reactivate the page.
+ *
+ * Perform the pmap_clear_reference() first. Otherwise, a concurrent
+ * pmap operation, such as pmap_remove(), could clear a reference in
+ * the pmap and set PG_REFERENCED on the page before the
+ * pmap_clear_reference() had completed. Consequently, the page would
+ * appear referenced based upon an old reference that occurred before
+ * this function ran.
*/
+ pmap_clear_reference(m);
vm_page_lock_queues();
vm_page_flag_clear(m, PG_REFERENCED);
vm_page_unlock_queues();
- pmap_clear_reference(m);
if (m->dirty == 0 && pmap_is_modified(m))
vm_page_dirty(m);
@@ -2142,7 +2149,9 @@ void
vm_page_clear_dirty(vm_page_t m, int base, int size)
{
- mtx_assert(&vm_page_queue_mtx, MA_OWNED);
+ VM_OBJECT_LOCK_ASSERT(m->object, MA_OWNED);
+ if ((m->flags & PG_WRITEABLE) != 0)
+ mtx_assert(&vm_page_queue_mtx, MA_OWNED);
m->dirty &= ~vm_page_bits(base, size);
}
Modified: head/sys/vm/vnode_pager.c
==============================================================================
--- head/sys/vm/vnode_pager.c Wed May 26 17:30:19 2010 (r208573)
+++ head/sys/vm/vnode_pager.c Wed May 26 18:00:44 2010 (r208574)
@@ -429,11 +429,9 @@ vnode_pager_setsize(vp, nsize)
* bits. This would prevent bogus_page
* replacement from working properly.
*/
- vm_page_lock(m);
vm_page_lock_queues();
vm_page_clear_dirty(m, base, PAGE_SIZE - base);
vm_page_unlock_queues();
- vm_page_unlock(m);
} else if ((nsize & PAGE_MASK) &&
__predict_false(object->cache != NULL)) {
vm_page_cache_free(object, OFF_TO_IDX(nsize),
@@ -1071,15 +1069,12 @@ vnode_pager_putpages(object, m, count, s
* then delayed.
*/
int
-vnode_pager_generic_putpages(vp, m, bytecount, flags, rtvals)
- struct vnode *vp;
- vm_page_t *m;
- int bytecount;
- int flags;
- int *rtvals;
+vnode_pager_generic_putpages(struct vnode *vp, vm_page_t *ma, int bytecount,
+ int flags, int *rtvals)
{
int i;
vm_object_t object;
+ vm_page_t m;
int count;
int maxsize, ncount;
@@ -1098,9 +1093,9 @@ vnode_pager_generic_putpages(vp, m, byte
for (i = 0; i < count; i++)
rtvals[i] = VM_PAGER_AGAIN;
- if ((int64_t)m[0]->pindex < 0) {
+ if ((int64_t)ma[0]->pindex < 0) {
printf("vnode_pager_putpages: attempt to write meta-data!!! --
0x%lx(%lx)\n",
- (long)m[0]->pindex, (u_long)m[0]->dirty);
+ (long)ma[0]->pindex, (u_long)ma[0]->dirty);
rtvals[0] = VM_PAGER_BAD;
return VM_PAGER_BAD;
}
@@ -1108,7 +1103,7 @@ vnode_pager_generic_putpages(vp, m, byte
maxsize = count * PAGE_SIZE;
ncount = count;
- poffset = IDX_TO_OFF(m[0]->pindex);
+ poffset = IDX_TO_OFF(ma[0]->pindex);
/*
* If the page-aligned write is larger then the actual file we
@@ -1122,6 +1117,7 @@ vnode_pager_generic_putpages(vp, m, byte
* We do not under any circumstances truncate the valid bits, as
* this will screw up bogus page replacement.
*/
+ VM_OBJECT_LOCK(object);
if (maxsize + poffset > object->un_pager.vnp.vnp_size) {
if (object->un_pager.vnp.vnp_size > poffset) {
int pgoff;
@@ -1129,12 +1125,19 @@ vnode_pager_generic_putpages(vp, m, byte
maxsize = object->un_pager.vnp.vnp_size - poffset;
ncount = btoc(maxsize);
if ((pgoff = (int)maxsize & PAGE_MASK) != 0) {
- vm_page_lock(m[ncount - 1]);
- vm_page_lock_queues();
- vm_page_clear_dirty(m[ncount - 1], pgoff,
- PAGE_SIZE - pgoff);
- vm_page_unlock_queues();
- vm_page_unlock(m[ncount - 1]);
+ /*
+ * If the object is locked and the following
+ * conditions hold, then the page's dirty
+ * field cannot be concurrently changed by a
+ * pmap operation.
+ */
+ m = ma[ncount - 1];
+ KASSERT(m->busy > 0,
+ ("vnode_pager_generic_putpages: page %p is not busy", m));
+ KASSERT((m->flags & PG_WRITEABLE) == 0,
+ ("vnode_pager_generic_putpages: page %p is not read-only", m));
+ vm_page_clear_dirty(m, pgoff, PAGE_SIZE -
+ pgoff);
}
} else {
maxsize = 0;
@@ -1146,6 +1149,7 @@ vnode_pager_generic_putpages(vp, m, byte
}
}
}
+ VM_OBJECT_UNLOCK(object);
/*
* pageouts are already clustered, use IO_ASYNC t o force a bawrite()
@@ -1182,7 +1186,7 @@ vnode_pager_generic_putpages(vp, m, byte
if (auio.uio_resid) {
if (ppscheck || ppsratecheck(&lastfail, &curfail, 1))
printf("vnode_pager_putpages: residual I/O %zd at
%lu\n",
- auio.uio_resid, (u_long)m[0]->pindex);
+ auio.uio_resid, (u_long)ma[0]->pindex);
}
for (i = 0; i < ncount; i++) {
rtvals[i] = VM_PAGER_OK;
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