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Eliminate (many) unnecessary calls to pmap_remove_all(). Pages from objects

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with a reference count of zero can't possibly be mapped, so there is never a
need for vm_page_set_invalid() to call pmap_remove_all() on them.

Reviewed by:	kib
MFC after:	1 week
Sponsored by:	EMC / Isilon Storage Division
This commit is contained in:
alc 2015-09-17 22:28:38 +00:00
parent bd28f7dce8
commit 899038e461
1 changed files with 2 additions and 1 deletions
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3
sys/vm/vm_page.c
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@ -3096,7 +3096,8 @@ vm_page_set_invalid(vm_page_t m, int base, int size)
bits = VM_PAGE_BITS_ALL;
else
bits = vm_page_bits(base, size);
if (m->valid == VM_PAGE_BITS_ALL && bits != 0)
if (object->ref_count != 0 && m->valid == VM_PAGE_BITS_ALL &&
bits != 0)
pmap_remove_all(m);
KASSERT((bits == 0 && m->valid == VM_PAGE_BITS_ALL) ||
!pmap_page_is_mapped(m),