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Avoid unneccessary TLB shootdowns in pmap_unwire_ptp() for user pmaps,

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which no longer create recursive page table mappings.

Benchmarked by:	bde
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Konstantin Belousov 2018-05-30 20:24:21 +00:00
parent 440e2f9e91
commit 1095694a73
1 changed files with 6 additions and 10 deletions
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16
sys/i386/i386/pmap.c
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@ -1872,7 +1872,6 @@ pmap_unwire_ptp(pmap_t pmap, vm_page_t m, struct spglist *free)
static void
_pmap_unwire_ptp(pmap_t pmap, vm_page_t m, struct spglist *free)
{
vm_offset_t pteva;
/*
* unmap the page table page
@ -1881,16 +1880,13 @@ _pmap_unwire_ptp(pmap_t pmap, vm_page_t m, struct spglist *free)
--pmap->pm_stats.resident_count;
/*
* Do an invltlb to make the invalidated mapping
* take effect immediately.
*/
pteva = VM_MAXUSER_ADDRESS + i386_ptob(m->pindex);
pmap_invalidate_page(pmap, pteva);
/*
* Put page on a list so that it is released after
* *ALL* TLB shootdown is done
* There is not need to invalidate the recursive mapping since
* we never instantiate such mapping for the usermode pmaps,
* and never remove page table pages from the kernel pmap.
* Put page on a list so that it is released since all TLB
* shootdown is done.
*/
MPASS(pmap != kernel_pmap);
pmap_add_delayed_free_list(m, free, TRUE);
}