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linux-sg2042
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Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 

* 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86-32, percpu: Correct the ordering of the percpu readmostly section
  x86, mm: Enable ARCH_DMA_ADDR_T_64BIT with X86_64 || HIGHMEM64G
  x86: Spread tlb flush vector between nodes
  percpu: Introduce a read-mostly percpu API
  x86, mm: Fix incorrect data type in vmalloc_sync_all()
  x86, mm: Hold mm->page_table_lock while doing vmalloc_sync
  x86, mm: Fix bogus whitespace in sync_global_pgds()
  x86-32: Fix sparse warning for the __PHYSICAL_MASK calculation
  x86, mm: Add RESERVE_BRK_ARRAY() helper
  mm, x86: Saving vmcore with non-lazy freeing of vmas
  x86, kdump: Change copy_oldmem_page() to use cached addressing
  x86, mm: fix uninitialized addr in kernel_physical_mapping_init()
  x86, kmemcheck: Remove double test
  x86, mm: Make spurious_fault check explicitly check the PRESENT bit
  x86-64, mem: Update all PGDs for direct mapping and vmemmap mapping changes
  x86, mm: Separate x86_64 vmalloc_sync_all() into separate functions
  x86, mm: Avoid unnecessary TLB flush
This commit is contained in:
Linus Torvalds 2010-10-21 13:47:29 -07:00
parent 8d8d2e9ccd 2aeb66d303
commit c3b86a2942
17 changed files with 174 additions and 34 deletions
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3
arch/x86/Kconfig
View File

@ -1163,6 +1163,9 @@ config X86_PAE
config ARCH_PHYS_ADDR_T_64BIT
def_bool X86_64 || X86_PAE
config ARCH_DMA_ADDR_T_64BIT
def_bool X86_64 || HIGHMEM64G
config DIRECT_GBPAGES
bool "Enable 1GB pages for kernel pagetables" if EMBEDDED
default y

1
arch/x86/include/asm/io.h
View File

@ -206,6 +206,7 @@ static inline void __iomem *ioremap(resource_size_t offset, unsigned long size)
extern void iounmap(volatile void __iomem *addr);
extern void set_iounmap_nonlazy(void);
#ifdef __KERNEL__

2
arch/x86/include/asm/page_types.h
View File

@ -8,7 +8,7 @@
#define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE-1))
#define __PHYSICAL_MASK ((phys_addr_t)(1ULL << __PHYSICAL_MASK_SHIFT) - 1)
#define __PHYSICAL_MASK ((phys_addr_t)((1ULL << __PHYSICAL_MASK_SHIFT) - 1))
#define __VIRTUAL_MASK ((1UL << __VIRTUAL_MASK_SHIFT) - 1)
/* Cast PAGE_MASK to a signed type so that it is sign-extended if

4
arch/x86/include/asm/pgtable.h
View File

@ -28,6 +28,8 @@ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
extern spinlock_t pgd_lock;
extern struct list_head pgd_list;
extern struct mm_struct *pgd_page_get_mm(struct page *page);
#ifdef CONFIG_PARAVIRT
#include <asm/paravirt.h>
#else /* !CONFIG_PARAVIRT */
@ -603,6 +605,8 @@ static inline void ptep_set_wrprotect(struct mm_struct *mm,
pte_update(mm, addr, ptep);
}
#define flush_tlb_fix_spurious_fault(vma, address)
/*
* clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
*

2
arch/x86/include/asm/pgtable_64.h
View File

@ -102,6 +102,8 @@ static inline void native_pgd_clear(pgd_t *pgd)
native_set_pgd(pgd, native_make_pgd(0));
}
extern void sync_global_pgds(unsigned long start, unsigned long end);
/*
* Conversion functions: convert a page and protection to a page entry,
* and a page entry and page directory to the page they refer to.

5
arch/x86/include/asm/setup.h
View File

@ -93,6 +93,11 @@ void *extend_brk(size_t size, size_t align);
: : "i" (sz)); \
}
/* Helper for reserving space for arrays of things */
#define RESERVE_BRK_ARRAY(type, name, entries) \
type *name; \
RESERVE_BRK(name, sizeof(type) * entries)
#ifdef __i386__
void __init i386_start_kernel(void);

3
arch/x86/kernel/crash_dump_64.c
View File

@ -34,7 +34,7 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
if (!csize)
return 0;
vaddr = ioremap(pfn << PAGE_SHIFT, PAGE_SIZE);
vaddr = ioremap_cache(pfn << PAGE_SHIFT, PAGE_SIZE);
if (!vaddr)
return -ENOMEM;
@ -46,6 +46,7 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
} else
memcpy(buf, vaddr + offset, csize);
set_iounmap_nonlazy();
iounmap(vaddr);
return csize;
}

43
arch/x86/mm/fault.c
View File

@ -229,7 +229,16 @@ void vmalloc_sync_all(void)
spin_lock_irqsave(&pgd_lock, flags);
list_for_each_entry(page, &pgd_list, lru) {
if (!vmalloc_sync_one(page_address(page), address))
spinlock_t *pgt_lock;
pmd_t *ret;
pgt_lock = &pgd_page_get_mm(page)->page_table_lock;
spin_lock(pgt_lock);
ret = vmalloc_sync_one(page_address(page), address);
spin_unlock(pgt_lock);
if (!ret)
break;
}
spin_unlock_irqrestore(&pgd_lock, flags);
@ -328,29 +337,7 @@ out:
void vmalloc_sync_all(void)
{
unsigned long address;
for (address = VMALLOC_START & PGDIR_MASK; address <= VMALLOC_END;
address += PGDIR_SIZE) {
const pgd_t *pgd_ref = pgd_offset_k(address);
unsigned long flags;
struct page *page;
if (pgd_none(*pgd_ref))
continue;
spin_lock_irqsave(&pgd_lock, flags);
list_for_each_entry(page, &pgd_list, lru) {
pgd_t *pgd;
pgd = (pgd_t *)page_address(page) + pgd_index(address);
if (pgd_none(*pgd))
set_pgd(pgd, *pgd_ref);
else
BUG_ON(pgd_page_vaddr(*pgd) != pgd_page_vaddr(*pgd_ref));
}
spin_unlock_irqrestore(&pgd_lock, flags);
}
sync_global_pgds(VMALLOC_START & PGDIR_MASK, VMALLOC_END);
}
/*
@ -898,8 +885,14 @@ spurious_fault(unsigned long error_code, unsigned long address)
if (pmd_large(*pmd))
return spurious_fault_check(error_code, (pte_t *) pmd);
/*
* Note: don't use pte_present() here, since it returns true
* if the _PAGE_PROTNONE bit is set. However, this aliases the
* _PAGE_GLOBAL bit, which for kernel pages give false positives
* when CONFIG_DEBUG_PAGEALLOC is used.
*/
pte = pte_offset_kernel(pmd, address);
if (!pte_present(*pte))
if (!(pte_flags(*pte) & _PAGE_PRESENT))
return 0;
ret = spurious_fault_check(error_code, pte);

47
arch/x86/mm/init_64.c
View File

@ -97,6 +97,43 @@ static int __init nonx32_setup(char *str)
}
__setup("noexec32=", nonx32_setup);
/*
* When memory was added/removed make sure all the processes MM have
* suitable PGD entries in the local PGD level page.
*/
void sync_global_pgds(unsigned long start, unsigned long end)
{
unsigned long address;
for (address = start; address <= end; address += PGDIR_SIZE) {
const pgd_t *pgd_ref = pgd_offset_k(address);
unsigned long flags;
struct page *page;
if (pgd_none(*pgd_ref))
continue;
spin_lock_irqsave(&pgd_lock, flags);
list_for_each_entry(page, &pgd_list, lru) {
pgd_t *pgd;
spinlock_t *pgt_lock;
pgd = (pgd_t *)page_address(page) + pgd_index(address);
pgt_lock = &pgd_page_get_mm(page)->page_table_lock;
spin_lock(pgt_lock);
if (pgd_none(*pgd))
set_pgd(pgd, *pgd_ref);
else
BUG_ON(pgd_page_vaddr(*pgd)
!= pgd_page_vaddr(*pgd_ref));
spin_unlock(pgt_lock);
}
spin_unlock_irqrestore(&pgd_lock, flags);
}
}
/*
* NOTE: This function is marked __ref because it calls __init function
* (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0.
@ -534,11 +571,13 @@ kernel_physical_mapping_init(unsigned long start,
unsigned long end,
unsigned long page_size_mask)
{
bool pgd_changed = false;
unsigned long next, last_map_addr = end;
unsigned long addr;
start = (unsigned long)__va(start);
end = (unsigned long)__va(end);
addr = start;
for (; start < end; start = next) {
pgd_t *pgd = pgd_offset_k(start);
@ -563,7 +602,12 @@ kernel_physical_mapping_init(unsigned long start,
spin_lock(&init_mm.page_table_lock);
pgd_populate(&init_mm, pgd, __va(pud_phys));
spin_unlock(&init_mm.page_table_lock);
pgd_changed = true;
}
if (pgd_changed)
sync_global_pgds(addr, end);
__flush_tlb_all();
return last_map_addr;
@ -1003,6 +1047,7 @@ vmemmap_populate(struct page *start_page, unsigned long size, int node)
}
}
sync_global_pgds((unsigned long)start_page, end);
return 0;
}

2
arch/x86/mm/kmemcheck/opcode.c
View File

@ -9,7 +9,7 @@ static bool opcode_is_prefix(uint8_t b)
b == 0xf0 || b == 0xf2 || b == 0xf3
/* Group 2 */
|| b == 0x2e || b == 0x36 || b == 0x3e || b == 0x26
|| b == 0x64 || b == 0x65 || b == 0x2e || b == 0x3e
|| b == 0x64 || b == 0x65
/* Group 3 */
|| b == 0x66
/* Group 4 */

20
arch/x86/mm/pgtable.c
View File

@ -87,7 +87,19 @@ static inline void pgd_list_del(pgd_t *pgd)
#define UNSHARED_PTRS_PER_PGD \
(SHARED_KERNEL_PMD ? KERNEL_PGD_BOUNDARY : PTRS_PER_PGD)
static void pgd_ctor(pgd_t *pgd)
static void pgd_set_mm(pgd_t *pgd, struct mm_struct *mm)
{
BUILD_BUG_ON(sizeof(virt_to_page(pgd)->index) < sizeof(mm));
virt_to_page(pgd)->index = (pgoff_t)mm;
}
struct mm_struct *pgd_page_get_mm(struct page *page)
{
return (struct mm_struct *)page->index;
}
static void pgd_ctor(struct mm_struct *mm, pgd_t *pgd)
{
/* If the pgd points to a shared pagetable level (either the
ptes in non-PAE, or shared PMD in PAE), then just copy the
@ -105,8 +117,10 @@ static void pgd_ctor(pgd_t *pgd)
}
/* list required to sync kernel mapping updates */
if (!SHARED_KERNEL_PMD)
if (!SHARED_KERNEL_PMD) {
pgd_set_mm(pgd, mm);
pgd_list_add(pgd);
}
}
static void pgd_dtor(pgd_t *pgd)
@ -272,7 +286,7 @@ pgd_t *pgd_alloc(struct mm_struct *mm)
*/
spin_lock_irqsave(&pgd_lock, flags);
pgd_ctor(pgd);
pgd_ctor(mm, pgd);
pgd_prepopulate_pmd(mm, pgd, pmds);
spin_unlock_irqrestore(&pgd_lock, flags);

48
arch/x86/mm/tlb.c
View File

@ -5,6 +5,7 @@
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/cpu.h>
#include <asm/tlbflush.h>
#include <asm/mmu_context.h>
@ -52,6 +53,8 @@ union smp_flush_state {
want false sharing in the per cpu data segment. */
static union smp_flush_state flush_state[NUM_INVALIDATE_TLB_VECTORS];
static DEFINE_PER_CPU_READ_MOSTLY(int, tlb_vector_offset);
/*
* We cannot call mmdrop() because we are in interrupt context,
* instead update mm->cpu_vm_mask.
@ -173,7 +176,7 @@ static void flush_tlb_others_ipi(const struct cpumask *cpumask,
union smp_flush_state *f;
/* Caller has disabled preemption */
sender = smp_processor_id() % NUM_INVALIDATE_TLB_VECTORS;
sender = this_cpu_read(tlb_vector_offset);
f = &flush_state[sender];
/*
@ -218,6 +221,47 @@ void native_flush_tlb_others(const struct cpumask *cpumask,
flush_tlb_others_ipi(cpumask, mm, va);
}
static void __cpuinit calculate_tlb_offset(void)
{
int cpu, node, nr_node_vecs;
/*
* we are changing tlb_vector_offset for each CPU in runtime, but this
* will not cause inconsistency, as the write is atomic under X86. we
* might see more lock contentions in a short time, but after all CPU's
* tlb_vector_offset are changed, everything should go normal
*
* Note: if NUM_INVALIDATE_TLB_VECTORS % nr_online_nodes !=0, we might
* waste some vectors.
**/
if (nr_online_nodes > NUM_INVALIDATE_TLB_VECTORS)
nr_node_vecs = 1;
else
nr_node_vecs = NUM_INVALIDATE_TLB_VECTORS/nr_online_nodes;
for_each_online_node(node) {
int node_offset = (node % NUM_INVALIDATE_TLB_VECTORS) *
nr_node_vecs;
int cpu_offset = 0;
for_each_cpu(cpu, cpumask_of_node(node)) {
per_cpu(tlb_vector_offset, cpu) = node_offset +
cpu_offset;
cpu_offset++;
cpu_offset = cpu_offset % nr_node_vecs;
}
}
}
static int tlb_cpuhp_notify(struct notifier_block *n,
unsigned long action, void *hcpu)
{
switch (action & 0xf) {
case CPU_ONLINE:
case CPU_DEAD:
calculate_tlb_offset();
}
return NOTIFY_OK;
}
static int __cpuinit init_smp_flush(void)
{
int i;
@ -225,6 +269,8 @@ static int __cpuinit init_smp_flush(void)
for (i = 0; i < ARRAY_SIZE(flush_state); i++)
raw_spin_lock_init(&flush_state[i].tlbstate_lock);
calculate_tlb_offset();
hotcpu_notifier(tlb_cpuhp_notify, 0);
return 0;
}
core_initcall(init_smp_flush);

4
include/asm-generic/pgtable.h
View File

@ -129,6 +129,10 @@ static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addres
#define move_pte(pte, prot, old_addr, new_addr) (pte)
#endif
#ifndef flush_tlb_fix_spurious_fault
#define flush_tlb_fix_spurious_fault(vma, address) flush_tlb_page(vma, address)
#endif
#ifndef pgprot_noncached
#define pgprot_noncached(prot) (prot)
#endif

4
include/asm-generic/vmlinux.lds.h
View File

@ -687,7 +687,9 @@
- LOAD_OFFSET) { \
VMLINUX_SYMBOL(__per_cpu_start) = .; \
*(.data..percpu..first) \
. = ALIGN(PAGE_SIZE); \
*(.data..percpu..page_aligned) \
*(.data..percpu..readmostly) \
*(.data..percpu) \
*(.data..percpu..shared_aligned) \
VMLINUX_SYMBOL(__per_cpu_end) = .; \
@ -713,7 +715,9 @@
VMLINUX_SYMBOL(__per_cpu_load) = .; \
VMLINUX_SYMBOL(__per_cpu_start) = .; \
*(.data..percpu..first) \
. = ALIGN(PAGE_SIZE); \
*(.data..percpu..page_aligned) \
*(.data..percpu..readmostly) \
*(.data..percpu) \
*(.data..percpu..shared_aligned) \
VMLINUX_SYMBOL(__per_cpu_end) = .; \

9
include/linux/percpu-defs.h
View File

@ -138,6 +138,15 @@
DEFINE_PER_CPU_SECTION(type, name, "..page_aligned") \
__aligned(PAGE_SIZE)
/*
* Declaration/definition used for per-CPU variables that must be read mostly.
*/
#define DECLARE_PER_CPU_READ_MOSTLY(type, name) \
DECLARE_PER_CPU_SECTION(type, name, "..readmostly")
#define DEFINE_PER_CPU_READ_MOSTLY(type, name) \
DEFINE_PER_CPU_SECTION(type, name, "..readmostly")
/*
* Intermodule exports for per-CPU variables. sparse forgets about
* address space across EXPORT_SYMBOL(), change EXPORT_SYMBOL() to

2
mm/memory.c
View File

@ -3185,7 +3185,7 @@ static inline int handle_pte_fault(struct mm_struct *mm,
* with threads.
*/
if (flags & FAULT_FLAG_WRITE)
flush_tlb_page(vma, address);
flush_tlb_fix_spurious_fault(vma, address);
}
unlock:
pte_unmap_unlock(pte, ptl);

9
mm/vmalloc.c
View File

@ -516,6 +516,15 @@ static atomic_t vmap_lazy_nr = ATOMIC_INIT(0);
/* for per-CPU blocks */
static void purge_fragmented_blocks_allcpus(void);
/*
* called before a call to iounmap() if the caller wants vm_area_struct's
* immediately freed.
*/
void set_iounmap_nonlazy(void)
{
atomic_set(&vmap_lazy_nr, lazy_max_pages()+1);
}
/*
* Purges all lazily-freed vmap areas.
*