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authorJeremy Fitzhardinge <jeremy@goop.org>2008-05-31 01:24:27 +0100
committerIngo Molnar <mingo@elte.hu>2008-06-02 13:24:40 +0200
commite2426cf85f8db5891fb5831323d2d0c176c4dadc (patch)
tree630dbc2032df606566f7249aa326c1e2a120c1ce /arch/x86/xen/enlighten.c
parent15ce60056b24a65b65e28de973a9fd8ac0750a2f (diff)
xen: avoid hypercalls when updating unpinned pud/pmd
When operating on an unpinned pagetable (ie, one under construction or destruction), it isn't necessary to use a hypercall to update a pud/pmd entry. Jan Beulich observed that a similar optimisation avoided many thousands of hypercalls while doing a kernel build. One tricky part is that early in the kernel boot there's no page structure, so we can't check to see if the page is pinned. In that case, we just always use the hypercall. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Jan Beulich <jbeulich@novell.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/xen/enlighten.c')
-rw-r--r--arch/x86/xen/enlighten.c14
1 files changed, 11 insertions, 3 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index b94f63ac228..ed9f04b3836 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -901,6 +901,14 @@ static __init void xen_pagetable_setup_done(pgd_t *base)
pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE, PFN_DOWN(__pa(base)));
}
+static __init void xen_post_allocator_init(void)
+{
+ pv_mmu_ops.set_pmd = xen_set_pmd;
+ pv_mmu_ops.set_pud = xen_set_pud;
+
+ xen_mark_init_mm_pinned();
+}
+
/* This is called once we have the cpu_possible_map */
void xen_setup_vcpu_info_placement(void)
{
@@ -988,7 +996,7 @@ static const struct pv_init_ops xen_init_ops __initdata = {
.banner = xen_banner,
.memory_setup = xen_memory_setup,
.arch_setup = xen_arch_setup,
- .post_allocator_init = xen_mark_init_mm_pinned,
+ .post_allocator_init = xen_post_allocator_init,
};
static const struct pv_time_ops xen_time_ops __initdata = {
@@ -1100,7 +1108,7 @@ static const struct pv_mmu_ops xen_mmu_ops __initdata = {
.set_pte = NULL, /* see xen_pagetable_setup_* */
.set_pte_at = xen_set_pte_at,
- .set_pmd = xen_set_pmd,
+ .set_pmd = xen_set_pmd_hyper,
.pte_val = xen_pte_val,
.pte_flags = native_pte_val,
@@ -1111,7 +1119,7 @@ static const struct pv_mmu_ops xen_mmu_ops __initdata = {
.set_pte_atomic = xen_set_pte_atomic,
.set_pte_present = xen_set_pte_at,
- .set_pud = xen_set_pud,
+ .set_pud = xen_set_pud_hyper,
.pte_clear = xen_pte_clear,
.pmd_clear = xen_pmd_clear,