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xen: lazy-mmu operations

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This patch uses the lazy-mmu hooks to batch mmu operations where
possible.  This is primarily useful for batching operations applied to
active pagetables, which happens during mprotect, munmap, mremap and
the like (mmap does not do bulk pagetable operations, so it isn't
helped).

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Acked-by: Chris Wright <chrisw@sous-sol.org>
This commit is contained in:
Jeremy Fitzhardinge
2007-07-17 18:37:06 -07:00
committed by Jeremy Fitzhardinge
parent f120f13ea0
commit d66bf8fcf3
3 changed files with 72 additions and 32 deletions
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52
arch/i386/xen/mmu.c
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@@ -98,12 +98,20 @@ void make_lowmem_page_readwrite(void *vaddr)
void xen_set_pmd(pmd_t *ptr, pmd_t val)
{
struct mmu_update u;
struct multicall_space mcs;
struct mmu_update *u;
u.ptr = virt_to_machine(ptr).maddr;
u.val = pmd_val_ma(val);
if (HYPERVISOR_mmu_update(&u, 1, NULL, DOMID_SELF) < 0)
BUG();
preempt_disable();
mcs = xen_mc_entry(sizeof(*u));
u = mcs.args;
u->ptr = virt_to_machine(ptr).maddr;
u->val = pmd_val_ma(val);
MULTI_mmu_update(mcs.mc, u, 1, NULL, DOMID_SELF);
xen_mc_issue(PARAVIRT_LAZY_MMU);
preempt_enable();
}
/*
@@ -146,20 +154,38 @@ void set_pte_mfn(unsigned long vaddr, unsigned long mfn, pgprot_t flags)
void xen_set_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pteval)
{
if ((mm != current->mm && mm != &init_mm) ||
HYPERVISOR_update_va_mapping(addr, pteval, 0) != 0)
xen_set_pte(ptep, pteval);
if (mm == current->mm || mm == &init_mm) {
if (xen_get_lazy_mode() == PARAVIRT_LAZY_MMU) {
struct multicall_space mcs;
mcs = xen_mc_entry(0);
MULTI_update_va_mapping(mcs.mc, addr, pteval, 0);
xen_mc_issue(PARAVIRT_LAZY_MMU);
return;
} else
if (HYPERVISOR_update_va_mapping(addr, pteval, 0) == 0)
return;
}
xen_set_pte(ptep, pteval);
}
#ifdef CONFIG_X86_PAE
void xen_set_pud(pud_t *ptr, pud_t val)
{
struct mmu_update u;
struct multicall_space mcs;
struct mmu_update *u;
u.ptr = virt_to_machine(ptr).maddr;
u.val = pud_val_ma(val);
if (HYPERVISOR_mmu_update(&u, 1, NULL, DOMID_SELF) < 0)
BUG();
preempt_disable();
mcs = xen_mc_entry(sizeof(*u));
u = mcs.args;
u->ptr = virt_to_machine(ptr).maddr;
u->val = pud_val_ma(val);
MULTI_mmu_update(mcs.mc, u, 1, NULL, DOMID_SELF);
xen_mc_issue(PARAVIRT_LAZY_MMU);
preempt_enable();
}
void xen_set_pte(pte_t *ptep, pte_t pte)