Author: alc
Date: Thu Mar 5 18:11:26 2009
New Revision: 189415
URL: http://svn.freebsd.org/changeset/base/189415
Log:
Make pmap_copy() more TLB friendly. Specifically, make it use the kernel's
direct map instead of the pmap's recursive mapping to access the lowest
level in the page table.
MFC after: 6 weeks
Modified:
head/sys/amd64/amd64/pmap.c
Modified: head/sys/amd64/amd64/pmap.c
==============================================================================
--- head/sys/amd64/amd64/pmap.c Thu Mar 5 18:03:46 2009 (r189414)
+++ head/sys/amd64/amd64/pmap.c Thu Mar 5 18:11:26 2009 (r189415)
@@ -3481,9 +3481,6 @@ pmap_copy(pmap_t dst_pmap, pmap_t src_pm
if (dst_addr != src_addr)
return;
- if (!pmap_is_current(src_pmap))
- return;
-
vm_page_lock_queues();
if (dst_pmap < src_pmap) {
PMAP_LOCK(dst_pmap);
@@ -3545,14 +3542,16 @@ pmap_copy(pmap_t dst_pmap, pmap_t src_pm
continue;
}
- srcmpte = PHYS_TO_VM_PAGE(srcptepaddr & PG_FRAME);
+ srcptepaddr &= PG_FRAME;
+ srcmpte = PHYS_TO_VM_PAGE(srcptepaddr);
KASSERT(srcmpte->wire_count > 0,
("pmap_copy: source page table page is unused"));
if (va_next > end_addr)
va_next = end_addr;
- src_pte = vtopte(addr);
+ src_pte = (pt_entry_t *)PHYS_TO_DMAP(srcptepaddr);
+ src_pte = &src_pte[pmap_pte_index(addr)];
while (addr < va_next) {
pt_entry_t ptetemp;
ptetemp = *src_pte;
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