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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] x86: introduce specialized clear_page()
# HG changeset patch
# User kfraser@xxxxxxxxxxxxxxxxxxxxx
# Date 1182352683 -3600
# Node ID 79b180596baf8969941da952a37c9d8b312218ff
# Parent 005dd6b1cf8e0008aba7984b828274a40e8d7d95
x86: introduce specialized clear_page()
More than doubles performance of page clearing on not too old
processors (SSE2 supported).
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
---
xen/arch/x86/Makefile | 1 +
xen/arch/x86/clear_page.S | 26 ++++++++++++++++++++++++++
xen/arch/x86/domain.c | 9 ++++++---
xen/arch/x86/x86_64/Makefile | 2 +-
xen/arch/x86/x86_64/mm.c | 9 ++++++---
xen/include/asm-x86/page.h | 13 +++++++++----
6 files changed, 49 insertions(+), 11 deletions(-)
diff -r 005dd6b1cf8e -r 79b180596baf xen/arch/x86/Makefile
--- a/xen/arch/x86/Makefile Wed Jun 20 15:33:14 2007 +0100
+++ b/xen/arch/x86/Makefile Wed Jun 20 16:18:03 2007 +0100
@@ -10,6 +10,7 @@ subdir-$(x86_64) += x86_64
obj-y += apic.o
obj-y += bitops.o
+obj-y += clear_page.o
obj-y += compat.o
obj-y += delay.o
obj-y += dmi_scan.o
diff -r 005dd6b1cf8e -r 79b180596baf xen/arch/x86/clear_page.S
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/xen/arch/x86/clear_page.S Wed Jun 20 16:18:03 2007 +0100
@@ -0,0 +1,26 @@
+#include <xen/config.h>
+#include <asm/page.h>
+
+#ifdef __i386__
+#define ptr_reg %edx
+#else
+#define ptr_reg %rdi
+#endif
+
+ENTRY(clear_page_sse2)
+#ifdef __i386__
+ mov 4(%esp), ptr_reg
+#endif
+ mov $PAGE_SIZE/16, %ecx
+ xor %eax,%eax
+
+0: dec %ecx
+ movnti %eax, (ptr_reg)
+ movnti %eax, 4(ptr_reg)
+ movnti %eax, 8(ptr_reg)
+ movnti %eax, 12(ptr_reg)
+ lea 16(ptr_reg), ptr_reg
+ jnz 0b
+
+ sfence
+ ret
diff -r 005dd6b1cf8e -r 79b180596baf xen/arch/x86/domain.c
--- a/xen/arch/x86/domain.c Wed Jun 20 15:33:14 2007 +0100
+++ b/xen/arch/x86/domain.c Wed Jun 20 16:18:03 2007 +0100
@@ -151,7 +151,8 @@ int setup_arg_xlat_area(struct vcpu *v,
pg = alloc_domheap_page(NULL);
if ( !pg )
return -ENOMEM;
- d->arch.mm_arg_xlat_l3 = clear_page(page_to_virt(pg));
+ d->arch.mm_arg_xlat_l3 = page_to_virt(pg);
+ clear_page(d->arch.mm_arg_xlat_l3);
}
l4tab[l4_table_offset(COMPAT_ARG_XLAT_VIRT_BASE)] =
@@ -444,7 +445,8 @@ int arch_domain_create(struct domain *d)
if ( (pg = alloc_domheap_page(NULL)) == NULL )
goto fail;
- d->arch.mm_perdomain_l2 = clear_page(page_to_virt(pg));
+ d->arch.mm_perdomain_l2 = page_to_virt(pg);
+ clear_page(d->arch.mm_perdomain_l2);
for ( i = 0; i < (1 << pdpt_order); i++ )
d->arch.mm_perdomain_l2[l2_table_offset(PERDOMAIN_VIRT_START)+i] =
l2e_from_page(virt_to_page(d->arch.mm_perdomain_pt)+i,
@@ -452,7 +454,8 @@ int arch_domain_create(struct domain *d)
if ( (pg = alloc_domheap_page(NULL)) == NULL )
goto fail;
- d->arch.mm_perdomain_l3 = clear_page(page_to_virt(pg));
+ d->arch.mm_perdomain_l3 = page_to_virt(pg);
+ clear_page(d->arch.mm_perdomain_l3);
d->arch.mm_perdomain_l3[l3_table_offset(PERDOMAIN_VIRT_START)] =
l3e_from_page(virt_to_page(d->arch.mm_perdomain_l2),
__PAGE_HYPERVISOR);
diff -r 005dd6b1cf8e -r 79b180596baf xen/arch/x86/x86_64/Makefile
--- a/xen/arch/x86/x86_64/Makefile Wed Jun 20 15:33:14 2007 +0100
+++ b/xen/arch/x86/x86_64/Makefile Wed Jun 20 16:18:03 2007 +0100
@@ -1,12 +1,12 @@ subdir-y += compat
subdir-y += compat
obj-y += entry.o
-obj-y += compat_kexec.o
obj-y += gpr_switch.o
obj-y += mm.o
obj-y += traps.o
obj-$(CONFIG_COMPAT) += compat.o
+obj-$(CONFIG_COMPAT) += compat_kexec.o
obj-$(CONFIG_COMPAT) += domain.o
obj-$(CONFIG_COMPAT) += physdev.o
obj-$(CONFIG_COMPAT) += platform_hypercall.o
diff -r 005dd6b1cf8e -r 79b180596baf xen/arch/x86/x86_64/mm.c
--- a/xen/arch/x86/x86_64/mm.c Wed Jun 20 15:33:14 2007 +0100
+++ b/xen/arch/x86/x86_64/mm.c Wed Jun 20 16:18:03 2007 +0100
@@ -106,7 +106,8 @@ void __init paging_init(void)
/* Create user-accessible L2 directory to map the MPT for guests. */
if ( (l2_pg = alloc_domheap_page(NULL)) == NULL )
goto nomem;
- l3_ro_mpt = clear_page(page_to_virt(l2_pg));
+ l3_ro_mpt = page_to_virt(l2_pg);
+ clear_page(l3_ro_mpt);
l4e_write(&idle_pg_table[l4_table_offset(RO_MPT_VIRT_START)],
l4e_from_page(l2_pg, __PAGE_HYPERVISOR | _PAGE_USER));
@@ -132,7 +133,8 @@ void __init paging_init(void)
if ( (l2_pg = alloc_domheap_page(NULL)) == NULL )
goto nomem;
va = RO_MPT_VIRT_START + (i << L2_PAGETABLE_SHIFT);
- l2_ro_mpt = clear_page(page_to_virt(l2_pg));
+ l2_ro_mpt = page_to_virt(l2_pg);
+ clear_page(l2_ro_mpt);
l3e_write(&l3_ro_mpt[l3_table_offset(va)],
l3e_from_page(l2_pg, __PAGE_HYPERVISOR | _PAGE_USER));
l2_ro_mpt += l2_table_offset(va);
@@ -152,7 +154,8 @@ void __init paging_init(void)
l3_ro_mpt =
l4e_to_l3e(idle_pg_table[l4_table_offset(HIRO_COMPAT_MPT_VIRT_START)]);
if ( (l2_pg = alloc_domheap_page(NULL)) == NULL )
goto nomem;
- compat_idle_pg_table_l2 = l2_ro_mpt = clear_page(page_to_virt(l2_pg));
+ compat_idle_pg_table_l2 = l2_ro_mpt = page_to_virt(l2_pg);
+ clear_page(l2_ro_mpt);
l3e_write(&l3_ro_mpt[l3_table_offset(HIRO_COMPAT_MPT_VIRT_START)],
l3e_from_page(l2_pg, __PAGE_HYPERVISOR));
l2_ro_mpt += l2_table_offset(HIRO_COMPAT_MPT_VIRT_START);
diff -r 005dd6b1cf8e -r 79b180596baf xen/include/asm-x86/page.h
--- a/xen/include/asm-x86/page.h Wed Jun 20 15:33:14 2007 +0100
+++ b/xen/include/asm-x86/page.h Wed Jun 20 16:18:03 2007 +0100
@@ -192,8 +192,9 @@ static inline l4_pgentry_t l4e_from_padd
#define pgentry_ptr_to_slot(_p) \
(((unsigned long)(_p) & ~PAGE_MASK) / sizeof(*(_p)))
+#ifndef __ASSEMBLY__
+
/* Page-table type. */
-#ifndef __ASSEMBLY__
#if CONFIG_PAGING_LEVELS == 2
/* x86_32 default */
typedef struct { u32 pfn; } pagetable_t;
@@ -214,9 +215,11 @@ typedef struct { u64 pfn; } pagetable_t;
#define pagetable_from_page(pg) pagetable_from_pfn(page_to_mfn(pg))
#define pagetable_from_paddr(p) pagetable_from_pfn((p)>>PAGE_SHIFT)
#define pagetable_null() pagetable_from_pfn(0)
-#endif
-
-#define clear_page(_p) memset((void *)(_p), 0, PAGE_SIZE)
+
+void clear_page_sse2(void *);
+#define clear_page(_p) (cpu_has_xmm2 ? \
+ clear_page_sse2((void *)(_p)) : \
+ (void)memset((void *)(_p), 0, PAGE_SIZE))
#define copy_page(_t,_f) memcpy((void *)(_t), (void *)(_f), PAGE_SIZE)
#define mfn_valid(mfn) ((mfn) < max_page)
@@ -244,6 +247,8 @@ typedef struct { u64 pfn; } pagetable_t;
/* Convert between frame number and address formats. */
#define pfn_to_paddr(pfn) ((paddr_t)(pfn) << PAGE_SHIFT)
#define paddr_to_pfn(pa) ((unsigned long)((pa) >> PAGE_SHIFT))
+
+#endif /* !defined(__ASSEMBLY__) */
/* High table entries are reserved by the hypervisor. */
#if defined(CONFIG_X86_32) && !defined(CONFIG_X86_PAE)
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