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Code Issues Releases Activity

Decouple the unrefing of a page table page from the removal of a pv entry.

Browse Source 
In other words, change pmap_remove_entry() such that it no longer unrefs
the page table page.  Now, it only removes the pv entry.

Reviewed by:	tegge
This commit is contained in:
Alan Cox 2005-08-11 02:22:55 +00:00
parent 3756fc3aaa
commit 8e7a85fac9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=148952
2 changed files with 30 additions and 48 deletions
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41
sys/amd64/amd64/pmap.c
View File

@ -207,8 +207,8 @@ static void pmap_clear_ptes(vm_page_t m, long bit);
static int pmap_remove_pte(pmap_t pmap, pt_entry_t *ptq,
vm_offset_t sva, pd_entry_t ptepde);
static void pmap_remove_page(struct pmap *pmap, vm_offset_t va);
static int pmap_remove_entry(struct pmap *pmap, vm_page_t m,
vm_offset_t va, pd_entry_t ptepde);
static void pmap_remove_entry(struct pmap *pmap, vm_page_t m,
vm_offset_t va);
static void pmap_insert_entry(pmap_t pmap, vm_offset_t va, vm_page_t m);
static vm_page_t pmap_allocpte(pmap_t pmap, vm_offset_t va, int flags);
@ -1420,11 +1420,10 @@ get_pv_entry(void)
}
static int
pmap_remove_entry(pmap_t pmap, vm_page_t m, vm_offset_t va, pd_entry_t ptepde)
static void
pmap_remove_entry(pmap_t pmap, vm_page_t m, vm_offset_t va)
{
pv_entry_t pv;
int rtval;
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
mtx_assert(&vm_page_queue_mtx, MA_OWNED);
@ -1439,20 +1438,13 @@ pmap_remove_entry(pmap_t pmap, vm_page_t m, vm_offset_t va, pd_entry_t ptepde)
break;
}
}
rtval = 0;
if (pv) {
rtval = pmap_unuse_pt(pmap, va, ptepde);
TAILQ_REMOVE(&m->md.pv_list, pv, pv_list);
m->md.pv_list_count--;
if (TAILQ_FIRST(&m->md.pv_list) == NULL)
vm_page_flag_clear(m, PG_WRITEABLE);
TAILQ_REMOVE(&pmap->pm_pvlist, pv, pv_plist);
free_pv_entry(pv);
}
return rtval;
KASSERT(pv != NULL, ("pmap_remove_entry: pv not found"));
TAILQ_REMOVE(&m->md.pv_list, pv, pv_list);
m->md.pv_list_count--;
if (TAILQ_EMPTY(&m->md.pv_list))
vm_page_flag_clear(m, PG_WRITEABLE);
TAILQ_REMOVE(&pmap->pm_pvlist, pv, pv_plist);
free_pv_entry(pv);
}
/*
@ -1510,10 +1502,9 @@ pmap_remove_pte(pmap_t pmap, pt_entry_t *ptq, vm_offset_t va, pd_entry_t ptepde)
}
if (oldpte & PG_A)
vm_page_flag_set(m, PG_REFERENCED);
return pmap_remove_entry(pmap, m, va, ptepde);
} else {
return pmap_unuse_pt(pmap, va, ptepde);
pmap_remove_entry(pmap, m, va);
}
return (pmap_unuse_pt(pmap, va, ptepde));
}
/*
@ -1930,9 +1921,9 @@ pmap_enter(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot,
pmap->pm_stats.wired_count--;
if (origpte & PG_MANAGED) {
om = PHYS_TO_VM_PAGE(opa);
err = pmap_remove_entry(pmap, om, va, ptepde);
} else
err = pmap_unuse_pt(pmap, va, ptepde);
pmap_remove_entry(pmap, om, va);
}
err = pmap_unuse_pt(pmap, va, ptepde);
if (err)
panic("pmap_enter: pte vanished, va: 0x%lx", va);
} else

37
sys/i386/i386/pmap.c
View File

@ -256,7 +256,7 @@ static void pmap_clear_ptes(vm_page_t m, int bit);
static int pmap_remove_pte(pmap_t pmap, pt_entry_t *ptq, vm_offset_t sva);
static void pmap_remove_page(struct pmap *pmap, vm_offset_t va);
static int pmap_remove_entry(struct pmap *pmap, vm_page_t m,
static void pmap_remove_entry(struct pmap *pmap, vm_page_t m,
vm_offset_t va);
static void pmap_insert_entry(pmap_t pmap, vm_offset_t va, vm_page_t m);
@ -1471,11 +1471,10 @@ get_pv_entry(void)
}
static int
static void
pmap_remove_entry(pmap_t pmap, vm_page_t m, vm_offset_t va)
{
pv_entry_t pv;
int rtval;
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
mtx_assert(&vm_page_queue_mtx, MA_OWNED);
@ -1490,20 +1489,13 @@ pmap_remove_entry(pmap_t pmap, vm_page_t m, vm_offset_t va)
break;
}
}
rtval = 0;
if (pv) {
rtval = pmap_unuse_pt(pmap, va);
TAILQ_REMOVE(&m->md.pv_list, pv, pv_list);
m->md.pv_list_count--;
if (TAILQ_FIRST(&m->md.pv_list) == NULL)
vm_page_flag_clear(m, PG_WRITEABLE);
TAILQ_REMOVE(&pmap->pm_pvlist, pv, pv_plist);
free_pv_entry(pv);
}
return rtval;
KASSERT(pv != NULL, ("pmap_remove_entry: pv not found"));
TAILQ_REMOVE(&m->md.pv_list, pv, pv_list);
m->md.pv_list_count--;
if (TAILQ_EMPTY(&m->md.pv_list))
vm_page_flag_clear(m, PG_WRITEABLE);
TAILQ_REMOVE(&pmap->pm_pvlist, pv, pv_plist);
free_pv_entry(pv);
}
/*
@ -1562,10 +1554,9 @@ pmap_remove_pte(pmap_t pmap, pt_entry_t *ptq, vm_offset_t va)
}
if (oldpte & PG_A)
vm_page_flag_set(m, PG_REFERENCED);
return pmap_remove_entry(pmap, m, va);
} else {
return pmap_unuse_pt(pmap, va);
pmap_remove_entry(pmap, m, va);
}
return (pmap_unuse_pt(pmap, va));
}
/*
@ -1969,9 +1960,9 @@ pmap_enter(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot,
pmap->pm_stats.wired_count--;
if (origpte & PG_MANAGED) {
om = PHYS_TO_VM_PAGE(opa);
err = pmap_remove_entry(pmap, om, va);
} else
err = pmap_unuse_pt(pmap, va);
pmap_remove_entry(pmap, om, va);
}
err = pmap_unuse_pt(pmap, va);
if (err)
panic("pmap_enter: pte vanished, va: 0x%x", va);
} else