Author: alc
Date: Fri Apr 30 15:22:52 2010
New Revision: 207437
URL: http://svn.freebsd.org/changeset/base/207437
Log:
MFamd64/i386 r207205
Clearing a page table entry's accessed bit and setting the page's
PG_REFERENCED flag in pmap_protect() can't really be justified, so
don't do it.
Additionally, two changes that make this pmap behave like the others do:
Change pmap_protect() such that it calls vm_page_dirty() only if the
page is managed.
Change pmap_remove_write() such that it doesn't clear a page table
entry's accessed bit.
Modified:
head/sys/powerpc/booke/pmap.c
Modified: head/sys/powerpc/booke/pmap.c
==============================================================================
--- head/sys/powerpc/booke/pmap.c Fri Apr 30 15:12:30 2010
(r207436)
+++ head/sys/powerpc/booke/pmap.c Fri Apr 30 15:22:52 2010
(r207437)
@@ -1915,16 +1915,11 @@ mmu_booke_protect(mmu_t mmu, pmap_t pmap
tlb_miss_lock();
/* Handle modified pages. */
- if (PTE_ISMODIFIED(pte))
+ if (PTE_ISMODIFIED(pte) && PTE_ISMANAGED(pte))
vm_page_dirty(m);
- /* Referenced pages. */
- if (PTE_ISREFERENCED(pte))
- vm_page_flag_set(m, PG_REFERENCED);
-
tlb0_flush_entry(va);
- pte->flags &= ~(PTE_UW | PTE_SW | PTE_MODIFIED |
- PTE_REFERENCED);
+ pte->flags &= ~(PTE_UW | PTE_SW | PTE_MODIFIED);
tlb_miss_unlock();
mtx_unlock_spin(&tlbivax_mutex);
@@ -1962,13 +1957,8 @@ mmu_booke_remove_write(mmu_t mmu, vm_pag
if (PTE_ISMODIFIED(pte))
vm_page_dirty(m);
- /* Referenced pages. */
- if (PTE_ISREFERENCED(pte))
- vm_page_flag_set(m, PG_REFERENCED);
-
/* Flush mapping from TLB0. */
- pte->flags &= ~(PTE_UW | PTE_SW | PTE_MODIFIED |
- PTE_REFERENCED);
+ pte->flags &= ~(PTE_UW | PTE_SW | PTE_MODIFIED);
tlb_miss_unlock();
mtx_unlock_spin(&tlbivax_mutex);
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