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powerpc/pmap: Minor optimizations to 64-bit booke pmap

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Don't recalculate the VM page of the page table pages, just pass them down
to free.  Also, use the pmap's page zero function instead of bzero().
This commit is contained in:
Justin Hibbits 2019-08-08 03:18:35 +00:00
parent ca05fff090
commit 937e8f20af
1 changed files with 7 additions and 19 deletions
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26
sys/powerpc/booke/pmap.c
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@ -264,7 +264,7 @@ static int pv_entry_count = 0, pv_entry_max = 0, pv_entry_high_water = 0;
#ifdef __powerpc64__
static pte_t *ptbl_alloc(mmu_t, pmap_t, pte_t **,
unsigned int, boolean_t);
static void ptbl_free(mmu_t, pmap_t, pte_t **, unsigned int);
static void ptbl_free(mmu_t, pmap_t, pte_t **, unsigned int, vm_page_t);
static void ptbl_hold(mmu_t, pmap_t, pte_t **, unsigned int);
static int ptbl_unhold(mmu_t, pmap_t, vm_offset_t);
#else
@ -615,19 +615,16 @@ pdir_alloc(mmu_t mmu, pmap_t pmap, unsigned int pp2d_idx, bool nosleep)
/* Zero whole ptbl. */
pdir = (pte_t **)PHYS_TO_DMAP(VM_PAGE_TO_PHYS(m));
bzero(pdir, PAGE_SIZE);
mmu_booke_zero_page(mmu, m);
return (pdir);
}
/* Free pdir pages and invalidate pdir entry. */
static void
pdir_free(mmu_t mmu, pmap_t pmap, unsigned int pp2d_idx)
pdir_free(mmu_t mmu, pmap_t pmap, unsigned int pp2d_idx, vm_page_t m)
{
pte_t **pdir;
vm_paddr_t pa;
vm_offset_t va;
vm_page_t m;
pdir = pmap->pm_pp2d[pp2d_idx];
@ -635,9 +632,6 @@ pdir_free(mmu_t mmu, pmap_t pmap, unsigned int pp2d_idx)
pmap->pm_pp2d[pp2d_idx] = NULL;
va = (vm_offset_t) pdir;
pa = DMAP_TO_PHYS(va);
m = PHYS_TO_VM_PAGE(pa);
vm_page_free_zero(m);
}
@ -667,7 +661,7 @@ pdir_unhold(mmu_t mmu, pmap_t pmap, u_int pp2d_idx)
* Free pdir page if there are no dir entries in this pdir.
*/
if (vm_page_unwire_noq(m)) {
pdir_free(mmu, pmap, pp2d_idx);
pdir_free(mmu, pmap, pp2d_idx, m);
return (1);
}
return (0);
@ -717,19 +711,16 @@ ptbl_alloc(mmu_t mmu, pmap_t pmap, pte_t ** pdir, unsigned int pdir_idx,
/* Zero whole ptbl. */
ptbl = (pte_t *)PHYS_TO_DMAP(VM_PAGE_TO_PHYS(m));
bzero(ptbl, PAGE_SIZE);
mmu_booke_zero_page(mmu, m);
return (ptbl);
}
/* Free ptbl pages and invalidate pdir entry. */
static void
ptbl_free(mmu_t mmu, pmap_t pmap, pte_t ** pdir, unsigned int pdir_idx)
ptbl_free(mmu_t mmu, pmap_t pmap, pte_t ** pdir, unsigned int pdir_idx, vm_page_t m)
{
pte_t *ptbl;
vm_paddr_t pa;
vm_offset_t va;
vm_page_t m;
ptbl = pdir[pdir_idx];
@ -737,9 +728,6 @@ ptbl_free(mmu_t mmu, pmap_t pmap, pte_t ** pdir, unsigned int pdir_idx)
pdir[pdir_idx] = NULL;
va = (vm_offset_t) ptbl;
pa = DMAP_TO_PHYS(va);
m = PHYS_TO_VM_PAGE(pa);
vm_page_free_zero(m);
}
@ -776,7 +764,7 @@ ptbl_unhold(mmu_t mmu, pmap_t pmap, vm_offset_t va)
* last page.
*/
if (vm_page_unwire_noq(m)) {
ptbl_free(mmu, pmap, pdir, pdir_idx);
ptbl_free(mmu, pmap, pdir, pdir_idx, m);
pdir_unhold(mmu, pmap, pp2d_idx);
return (1);
}