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authorJeremy Fitzhardinge <jeremy@xensource.com>2007-07-17 18:37:06 -0700
committerJeremy Fitzhardinge <jeremy@goop.org>2007-07-18 08:47:44 -0700
commitd66bf8fcf3fce058a1cd164a7c8ee6093fdf039c (patch)
treed09a2a4a8d0e81b8f19a4844c18690fe521bf513
parentf120f13ea0dbb0b0d6675683d5f6faea71277e65 (diff)
xen: lazy-mmu operations
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>
-rw-r--r--arch/i386/xen/enlighten.c48
-rw-r--r--arch/i386/xen/mmu.c52
-rw-r--r--arch/i386/xen/multicalls.c4
3 files changed, 72 insertions, 32 deletions
diff --git a/arch/i386/xen/enlighten.c b/arch/i386/xen/enlighten.c
index a1124b7f1d1..031dc1dcf81 100644
--- a/arch/i386/xen/enlighten.c
+++ b/arch/i386/xen/enlighten.c
@@ -472,28 +472,38 @@ static void xen_apic_write(unsigned long reg, unsigned long val)
static void xen_flush_tlb(void)
{
- struct mmuext_op op;
+ struct mmuext_op *op;
+ struct multicall_space mcs = xen_mc_entry(sizeof(*op));
- op.cmd = MMUEXT_TLB_FLUSH_LOCAL;
- if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF))
- BUG();
+ op = mcs.args;
+ op->cmd = MMUEXT_TLB_FLUSH_LOCAL;
+ MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
+
+ xen_mc_issue(PARAVIRT_LAZY_MMU);
}
static void xen_flush_tlb_single(unsigned long addr)
{
- struct mmuext_op op;
+ struct mmuext_op *op;
+ struct multicall_space mcs = xen_mc_entry(sizeof(*op));
- op.cmd = MMUEXT_INVLPG_LOCAL;
- op.arg1.linear_addr = addr & PAGE_MASK;
- if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF))
- BUG();
+ op = mcs.args;
+ op->cmd = MMUEXT_INVLPG_LOCAL;
+ op->arg1.linear_addr = addr & PAGE_MASK;
+ MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
+
+ xen_mc_issue(PARAVIRT_LAZY_MMU);
}
static void xen_flush_tlb_others(const cpumask_t *cpus, struct mm_struct *mm,
unsigned long va)
{
- struct mmuext_op op;
+ struct {
+ struct mmuext_op op;
+ cpumask_t mask;
+ } *args;
cpumask_t cpumask = *cpus;
+ struct multicall_space mcs;
/*
* A couple of (to be removed) sanity checks:
@@ -510,17 +520,21 @@ static void xen_flush_tlb_others(const cpumask_t *cpus, struct mm_struct *mm,
if (cpus_empty(cpumask))
return;
+ mcs = xen_mc_entry(sizeof(*args));
+ args = mcs.args;
+ args->mask = cpumask;
+ args->op.arg2.vcpumask = &args->mask;
+
if (va == TLB_FLUSH_ALL) {
- op.cmd = MMUEXT_TLB_FLUSH_MULTI;
- op.arg2.vcpumask = (void *)cpus;
+ args->op.cmd = MMUEXT_TLB_FLUSH_MULTI;
} else {
- op.cmd = MMUEXT_INVLPG_MULTI;
- op.arg1.linear_addr = va;
- op.arg2.vcpumask = (void *)cpus;
+ args->op.cmd = MMUEXT_INVLPG_MULTI;
+ args->op.arg1.linear_addr = va;
}
- if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF))
- BUG();
+ MULTI_mmuext_op(mcs.mc, &args->op, 1, NULL, DOMID_SELF);
+
+ xen_mc_issue(PARAVIRT_LAZY_MMU);
}
static unsigned long xen_read_cr2(void)
diff --git a/arch/i386/xen/mmu.c b/arch/i386/xen/mmu.c
index f431cf14e64..4ae038aa6c2 100644
--- a/arch/i386/xen/mmu.c
+++ b/arch/i386/xen/mmu.c
@@ -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)
diff --git a/arch/i386/xen/multicalls.c b/arch/i386/xen/multicalls.c
index d4015a9ed46..c837e8e463d 100644
--- a/arch/i386/xen/multicalls.c
+++ b/arch/i386/xen/multicalls.c
@@ -26,8 +26,8 @@
#include "multicalls.h"
-#define MC_BATCH 8
-#define MC_ARGS (MC_BATCH * 32 / sizeof(u64))
+#define MC_BATCH 32
+#define MC_ARGS (MC_BATCH * 16 / sizeof(u64))
struct mc_buffer {
struct multicall_entry entries[MC_BATCH];