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Merge git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-2.6-nommu 

* git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-2.6-nommu:
  NOMMU: Support XIP on initramfs
  NOMMU: Teach kobjsize() about VMA regions.
  FLAT: Don't attempt to expand the userspace stack to fill the space allocated
  FDPIC: Don't attempt to expand the userspace stack to fill the space allocated
  NOMMU: Improve procfs output using per-MM VMAs
  NOMMU: Make mmap allocation page trimming behaviour configurable.
  NOMMU: Make VMAs per MM as for MMU-mode linux
  NOMMU: Delete askedalloc and realalloc variables
  NOMMU: Rename ARM's struct vm_region
  NOMMU: Fix cleanup handling in ramfs_nommu_get_umapped_area()
This commit is contained in:
Linus Torvalds 2009-01-09 14:00:58 -08:00
Родитель 1a7d0f0bec cb6ff20807
Коммит c40f6f8bbc
29 изменённых файлов: 1019 добавлений и 548 удалений
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31
Documentation/nommu-mmap.txt
Просмотреть файл

@ -109,12 +109,18 @@ and it's also much more restricted in the latter case:
FURTHER NOTES ON NO-MMU MMAP
============================
(*) A request for a private mapping of less than a page in size may not return
a page-aligned buffer. This is because the kernel calls kmalloc() to
allocate the buffer, not get_free_page().
(*) A request for a private mapping of a file may return a buffer that is not
page-aligned. This is because XIP may take place, and the data may not be
paged aligned in the backing store.
(*) A list of all the mappings on the system is visible through /proc/maps in
no-MMU mode.
(*) A request for an anonymous mapping will always be page aligned. If
possible the size of the request should be a power of two otherwise some
of the space may be wasted as the kernel must allocate a power-of-2
granule but will only discard the excess if appropriately configured as
this has an effect on fragmentation.
(*) A list of all the private copy and anonymous mappings on the system is
visible through /proc/maps in no-MMU mode.
(*) A list of all the mappings in use by a process is visible through
/proc/<pid>/maps in no-MMU mode.
@ -242,3 +248,18 @@ PROVIDING SHAREABLE BLOCK DEVICE SUPPORT
Provision of shared mappings on block device files is exactly the same as for
character devices. If there isn't a real device underneath, then the driver
should allocate sufficient contiguous memory to honour any supported mapping.
=================================
ADJUSTING PAGE TRIMMING BEHAVIOUR
=================================
NOMMU mmap automatically rounds up to the nearest power-of-2 number of pages
when performing an allocation. This can have adverse effects on memory
fragmentation, and as such, is left configurable. The default behaviour is to
aggressively trim allocations and discard any excess pages back in to the page
allocator. In order to retain finer-grained control over fragmentation, this
behaviour can either be disabled completely, or bumped up to a higher page
watermark where trimming begins.
Page trimming behaviour is configurable via the sysctl `vm.nr_trim_pages'.

18
Documentation/sysctl/vm.txt
Просмотреть файл

@ -38,6 +38,7 @@ Currently, these files are in /proc/sys/vm:
- numa_zonelist_order
- nr_hugepages
- nr_overcommit_hugepages
- nr_trim_pages (only if CONFIG_MMU=n)
==============================================================
@ -348,3 +349,20 @@ Change the maximum size of the hugepage pool. The maximum is
nr_hugepages + nr_overcommit_hugepages.
See Documentation/vm/hugetlbpage.txt
==============================================================
nr_trim_pages
This is available only on NOMMU kernels.
This value adjusts the excess page trimming behaviour of power-of-2 aligned
NOMMU mmap allocations.
A value of 0 disables trimming of allocations entirely, while a value of 1
trims excess pages aggressively. Any value >= 1 acts as the watermark where
trimming of allocations is initiated.
The default value is 1.
See Documentation/nommu-mmap.txt for more information.

1
arch/arm/include/asm/mmu.h
Просмотреть файл

@ -24,7 +24,6 @@ typedef struct {
* modified for 2.6 by Hyok S. Choi <hyok.choi@samsung.com>
*/
typedef struct {
struct vm_list_struct *vmlist;
unsigned long end_brk;
} mm_context_t;

28
arch/arm/mm/dma-mapping.c
Просмотреть файл

@ -71,7 +71,7 @@ static DEFINE_SPINLOCK(consistent_lock);
* the amount of RAM found at boot time.) I would imagine that get_vm_area()
* would have to initialise this each time prior to calling vm_region_alloc().
*/
struct vm_region {
struct arm_vm_region {
struct list_head vm_list;
unsigned long vm_start;
unsigned long vm_end;
@ -79,20 +79,20 @@ struct vm_region {
int vm_active;
};
static struct vm_region consistent_head = {
static struct arm_vm_region consistent_head = {
.vm_list = LIST_HEAD_INIT(consistent_head.vm_list),
.vm_start = CONSISTENT_BASE,
.vm_end = CONSISTENT_END,
};
static struct vm_region *
vm_region_alloc(struct vm_region *head, size_t size, gfp_t gfp)
static struct arm_vm_region *
arm_vm_region_alloc(struct arm_vm_region *head, size_t size, gfp_t gfp)
{
unsigned long addr = head->vm_start, end = head->vm_end - size;
unsigned long flags;
struct vm_region *c, *new;
struct arm_vm_region *c, *new;
new = kmalloc(sizeof(struct vm_region), gfp);
new = kmalloc(sizeof(struct arm_vm_region), gfp);
if (!new)
goto out;
@ -127,9 +127,9 @@ vm_region_alloc(struct vm_region *head, size_t size, gfp_t gfp)
return NULL;
}
static struct vm_region *vm_region_find(struct vm_region *head, unsigned long addr)
static struct arm_vm_region *arm_vm_region_find(struct arm_vm_region *head, unsigned long addr)
{
struct vm_region *c;
struct arm_vm_region *c;
list_for_each_entry(c, &head->vm_list, vm_list) {
if (c->vm_active && c->vm_start == addr)
@ -149,7 +149,7 @@ __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
pgprot_t prot)
{
struct page *page;
struct vm_region *c;
struct arm_vm_region *c;
unsigned long order;
u64 mask = ISA_DMA_THRESHOLD, limit;
@ -214,7 +214,7 @@ __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
/*
* Allocate a virtual address in the consistent mapping region.
*/
c = vm_region_alloc(&consistent_head, size,
c = arm_vm_region_alloc(&consistent_head, size,
gfp & ~(__GFP_DMA | __GFP_HIGHMEM));
if (c) {
pte_t *pte;
@ -311,13 +311,13 @@ static int dma_mmap(struct device *dev, struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size)
{
unsigned long flags, user_size, kern_size;
struct vm_region *c;
struct arm_vm_region *c;
int ret = -ENXIO;
user_size = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
spin_lock_irqsave(&consistent_lock, flags);
c = vm_region_find(&consistent_head, (unsigned long)cpu_addr);
c = arm_vm_region_find(&consistent_head, (unsigned long)cpu_addr);
spin_unlock_irqrestore(&consistent_lock, flags);
if (c) {
@ -359,7 +359,7 @@ EXPORT_SYMBOL(dma_mmap_writecombine);
*/
void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, dma_addr_t handle)
{
struct vm_region *c;
struct arm_vm_region *c;
unsigned long flags, addr;
pte_t *ptep;
int idx;
@ -378,7 +378,7 @@ void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, dma_addr
size = PAGE_ALIGN(size);
spin_lock_irqsave(&consistent_lock, flags);
c = vm_region_find(&consistent_head, (unsigned long)cpu_addr);
c = arm_vm_region_find(&consistent_head, (unsigned long)cpu_addr);
if (!c)
goto no_area;

1
arch/blackfin/include/asm/mmu.h
Просмотреть файл

@ -10,7 +10,6 @@ struct sram_list_struct {
};
typedef struct {
struct vm_list_struct *vmlist;
unsigned long end_brk;
unsigned long stack_start;

6
arch/blackfin/kernel/ptrace.c
Просмотреть файл

@ -160,15 +160,15 @@ put_reg(struct task_struct *task, int regno, unsigned long data)
static inline int is_user_addr_valid(struct task_struct *child,
unsigned long start, unsigned long len)
{
struct vm_list_struct *vml;
struct vm_area_struct *vma;
struct sram_list_struct *sraml;
/* overflow */
if (start + len < start)
return -EIO;
for (vml = child->mm->context.vmlist; vml; vml = vml->next)
if (start >= vml->vma->vm_start && start + len < vml->vma->vm_end)
vma = find_vma(child->mm, start);
if (vma && start >= vma->vm_start && start + len <= vma->vm_end)
return 0;
for (sraml = child->mm->context.sram_list; sraml; sraml = sraml->next)

11
arch/blackfin/kernel/traps.c
Просмотреть файл

@ -32,6 +32,7 @@
#include <linux/module.h>
#include <linux/kallsyms.h>
#include <linux/fs.h>
#include <linux/rbtree.h>
#include <asm/traps.h>
#include <asm/cacheflush.h>
#include <asm/cplb.h>
@ -83,6 +84,7 @@ static void decode_address(char *buf, unsigned long address)
struct mm_struct *mm;
unsigned long flags, offset;
unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
struct rb_node *n;
#ifdef CONFIG_KALLSYMS
unsigned long symsize;
@ -128,9 +130,10 @@ static void decode_address(char *buf, unsigned long address)
if (!mm)
continue;
vml = mm->context.vmlist;
while (vml) {
struct vm_area_struct *vma = vml->vma;
for (n = rb_first(&mm->mm_rb); n; n = rb_next(n)) {
struct vm_area_struct *vma;
vma = rb_entry(n, struct vm_area_struct, vm_rb);
if (address >= vma->vm_start && address < vma->vm_end) {
char _tmpbuf[256];
@ -176,8 +179,6 @@ static void decode_address(char *buf, unsigned long address)
goto done;
}
vml = vml->next;
}
if (!in_atomic)
mmput(mm);

11
arch/frv/kernel/ptrace.c
Просмотреть файл

@ -69,7 +69,8 @@ static inline int put_reg(struct task_struct *task, int regno,
}
/*
* check that an address falls within the bounds of the target process's memory mappings
* check that an address falls within the bounds of the target process's memory
* mappings
*/
static inline int is_user_addr_valid(struct task_struct *child,
unsigned long start, unsigned long len)
@ -79,11 +80,11 @@ static inline int is_user_addr_valid(struct task_struct *child,
return -EIO;
return 0;
#else
struct vm_list_struct *vml;
struct vm_area_struct *vma;
for (vml = child->mm->context.vmlist; vml; vml = vml->next)
if (start >= vml->vma->vm_start && start + len <= vml->vma->vm_end)
return 0;
vma = find_vma(child->mm, start);
if (vma && start >= vma->vm_start && start + len <= vma->vm_end)
return 0;
return -EIO;
#endif

1
arch/h8300/include/asm/mmu.h
Просмотреть файл

@ -4,7 +4,6 @@
/* Copyright (C) 2002, David McCullough <davidm@snapgear.com> */
typedef struct {
struct vm_list_struct *vmlist;
unsigned long end_brk;
} mm_context_t;

1
arch/m68knommu/include/asm/mmu.h
Просмотреть файл

@ -4,7 +4,6 @@
/* Copyright (C) 2002, David McCullough <davidm@snapgear.com> */
typedef struct {
struct vm_list_struct *vmlist;
unsigned long end_brk;
} mm_context_t;

1
arch/sh/include/asm/mmu.h
Просмотреть файл

@ -9,7 +9,6 @@ typedef struct {
mm_context_id_t id;
void *vdso;
#else
struct vm_list_struct *vmlist;
unsigned long end_brk;
#endif
#ifdef CONFIG_BINFMT_ELF_FDPIC

35
fs/binfmt_elf_fdpic.c
Просмотреть файл

@ -168,9 +168,6 @@ static int load_elf_fdpic_binary(struct linux_binprm *bprm,
struct elf_fdpic_params exec_params, interp_params;
struct elf_phdr *phdr;
unsigned long stack_size, entryaddr;
#ifndef CONFIG_MMU
unsigned long fullsize;
#endif
#ifdef ELF_FDPIC_PLAT_INIT
unsigned long dynaddr;
#endif
@ -390,11 +387,6 @@ static int load_elf_fdpic_binary(struct linux_binprm *bprm,
goto error_kill;
}
/* expand the stack mapping to use up the entire allocation granule */
fullsize = kobjsize((char *) current->mm->start_brk);
if (!IS_ERR_VALUE(do_mremap(current->mm->start_brk, stack_size,
fullsize, 0, 0)))
stack_size = fullsize;
up_write(&current->mm->mmap_sem);
current->mm->brk = current->mm->start_brk;
@ -1567,11 +1559,9 @@ end_coredump:
static int elf_fdpic_dump_segments(struct file *file, size_t *size,
unsigned long *limit, unsigned long mm_flags)
{
struct vm_list_struct *vml;
for (vml = current->mm->context.vmlist; vml; vml = vml->next) {
struct vm_area_struct *vma = vml->vma;
struct vm_area_struct *vma;
for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
if (!maydump(vma, mm_flags))
continue;
@ -1617,9 +1607,6 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
elf_fpxregset_t *xfpu = NULL;
#endif
int thread_status_size = 0;
#ifndef CONFIG_MMU
struct vm_list_struct *vml;
#endif
elf_addr_t *auxv;
unsigned long mm_flags;
@ -1685,13 +1672,7 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
fill_prstatus(prstatus, current, signr);
elf_core_copy_regs(&prstatus->pr_reg, regs);
#ifdef CONFIG_MMU
segs = current->mm->map_count;
#else
segs = 0;
for (vml = current->mm->context.vmlist; vml; vml = vml->next)
segs++;
#endif
#ifdef ELF_CORE_EXTRA_PHDRS
segs += ELF_CORE_EXTRA_PHDRS;
#endif
@ -1766,20 +1747,10 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
mm_flags = current->mm->flags;
/* write program headers for segments dump */
for (
#ifdef CONFIG_MMU
vma = current->mm->mmap; vma; vma = vma->vm_next
#else
vml = current->mm->context.vmlist; vml; vml = vml->next
#endif
) {
for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
struct elf_phdr phdr;
size_t sz;
#ifndef CONFIG_MMU
vma = vml->vma;
#endif
sz = vma->vm_end - vma->vm_start;
phdr.p_type = PT_LOAD;

34
fs/binfmt_flat.c
Просмотреть файл

@ -417,8 +417,8 @@ static int load_flat_file(struct linux_binprm * bprm,
unsigned long textpos = 0, datapos = 0, result;
unsigned long realdatastart = 0;
unsigned long text_len, data_len, bss_len, stack_len, flags;
unsigned long len, reallen, memp = 0;
unsigned long extra, rlim;
unsigned long len, memp = 0;
unsigned long memp_size, extra, rlim;
unsigned long *reloc = 0, *rp;
struct inode *inode;
int i, rev, relocs = 0;
@ -543,17 +543,10 @@ static int load_flat_file(struct linux_binprm * bprm,
}
len = data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long);
len = PAGE_ALIGN(len);
down_write(&current->mm->mmap_sem);
realdatastart = do_mmap(0, 0, len,
PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0);
/* Remap to use all availabe slack region space */
if (realdatastart && (realdatastart < (unsigned long)-4096)) {
reallen = kobjsize((void *)realdatastart);
if (reallen > len) {
realdatastart = do_mremap(realdatastart, len,
reallen, MREMAP_FIXED, realdatastart);
}
}
up_write(&current->mm->mmap_sem);
if (realdatastart == 0 || realdatastart >= (unsigned long)-4096) {
@ -591,21 +584,14 @@ static int load_flat_file(struct linux_binprm * bprm,
reloc = (unsigned long *) (datapos+(ntohl(hdr->reloc_start)-text_len));
memp = realdatastart;
memp_size = len;
} else {
len = text_len + data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long);
len = PAGE_ALIGN(len);
down_write(&current->mm->mmap_sem);
textpos = do_mmap(0, 0, len,
PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0);
/* Remap to use all availabe slack region space */
if (textpos && (textpos < (unsigned long) -4096)) {
reallen = kobjsize((void *)textpos);
if (reallen > len) {
textpos = do_mremap(textpos, len, reallen,
MREMAP_FIXED, textpos);
}
}
up_write(&current->mm->mmap_sem);
if (!textpos || textpos >= (unsigned long) -4096) {
@ -622,7 +608,7 @@ static int load_flat_file(struct linux_binprm * bprm,
reloc = (unsigned long *) (textpos + ntohl(hdr->reloc_start) +
MAX_SHARED_LIBS * sizeof(unsigned long));
memp = textpos;
memp_size = len;
#ifdef CONFIG_BINFMT_ZFLAT
/*
* load it all in and treat it like a RAM load from now on
@ -680,10 +666,12 @@ static int load_flat_file(struct linux_binprm * bprm,
* set up the brk stuff, uses any slack left in data/bss/stack
* allocation. We put the brk after the bss (between the bss
* and stack) like other platforms.
* Userspace code relies on the stack pointer starting out at
* an address right at the end of a page.
*/
current->mm->start_brk = datapos + data_len + bss_len;
current->mm->brk = (current->mm->start_brk + 3) & ~3;
current->mm->context.end_brk = memp + kobjsize((void *) memp) - stack_len;
current->mm->context.end_brk = memp + memp_size - stack_len;
}
if (flags & FLAT_FLAG_KTRACE)
@ -790,8 +778,8 @@ static int load_flat_file(struct linux_binprm * bprm,
/* zero the BSS, BRK and stack areas */
memset((void*)(datapos + data_len), 0, bss_len +
(memp + kobjsize((void *) memp) - stack_len - /* end brk */
libinfo->lib_list[id].start_brk) + /* start brk */
(memp + memp_size - stack_len - /* end brk */
libinfo->lib_list[id].start_brk) + /* start brk */
stack_len);
return 0;

2
fs/proc/internal.h
Просмотреть файл

@ -41,8 +41,6 @@ do { \
(vmi)->used = 0; \
(vmi)->largest_chunk = 0; \
} while(0)
extern int nommu_vma_show(struct seq_file *, struct vm_area_struct *);
#endif
extern int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,

6
fs/proc/meminfo.c
Просмотреть файл

@ -73,6 +73,9 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
"HighFree: %8lu kB\n"
"LowTotal: %8lu kB\n"
"LowFree: %8lu kB\n"
#endif
#ifndef CONFIG_MMU
"MmapCopy: %8lu kB\n"
#endif
"SwapTotal: %8lu kB\n"
"SwapFree: %8lu kB\n"
@ -115,6 +118,9 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
K(i.freehigh),
K(i.totalram-i.totalhigh),
K(i.freeram-i.freehigh),
#endif
#ifndef CONFIG_MMU
K((unsigned long) atomic_read(&mmap_pages_allocated)),
#endif
K(i.totalswap),
K(i.freeswap),

71
fs/proc/nommu.c
Просмотреть файл

@ -33,33 +33,33 @@
#include "internal.h"
/*
* display a single VMA to a sequenced file
* display a single region to a sequenced file
*/
int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma)
static int nommu_region_show(struct seq_file *m, struct vm_region *region)
{
unsigned long ino = 0;
struct file *file;
dev_t dev = 0;
int flags, len;
flags = vma->vm_flags;
file = vma->vm_file;
flags = region->vm_flags;
file = region->vm_file;
if (file) {
struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
struct inode *inode = region->vm_file->f_path.dentry->d_inode;
dev = inode->i_sb->s_dev;
ino = inode->i_ino;
}
seq_printf(m,
"%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu %n",
vma->vm_start,
vma->vm_end,
region->vm_start,
region->vm_end,
flags & VM_READ ? 'r' : '-',
flags & VM_WRITE ? 'w' : '-',
flags & VM_EXEC ? 'x' : '-',
flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p',
((loff_t)vma->vm_pgoff) << PAGE_SHIFT,
((loff_t)region->vm_pgoff) << PAGE_SHIFT,
MAJOR(dev), MINOR(dev), ino, &len);
if (file) {
@ -75,61 +75,54 @@ int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma)
}
/*
* display a list of all the VMAs the kernel knows about
* display a list of all the REGIONs the kernel knows about
* - nommu kernals have a single flat list
*/
static int nommu_vma_list_show(struct seq_file *m, void *v)
static int nommu_region_list_show(struct seq_file *m, void *_p)
{
struct vm_area_struct *vma;
struct rb_node *p = _p;
vma = rb_entry((struct rb_node *) v, struct vm_area_struct, vm_rb);
return nommu_vma_show(m, vma);
return nommu_region_show(m, rb_entry(p, struct vm_region, vm_rb));
}
static void *nommu_vma_list_start(struct seq_file *m, loff_t *_pos)
static void *nommu_region_list_start(struct seq_file *m, loff_t *_pos)
{
struct rb_node *_rb;
struct rb_node *p;
loff_t pos = *_pos;
void *next = NULL;
down_read(&nommu_vma_sem);
down_read(&nommu_region_sem);
for (_rb = rb_first(&nommu_vma_tree); _rb; _rb = rb_next(_rb)) {
if (pos == 0) {
next = _rb;
break;
}
pos--;
}
return next;
for (p = rb_first(&nommu_region_tree); p; p = rb_next(p))
if (pos-- == 0)
return p;
return NULL;
}
static void nommu_vma_list_stop(struct seq_file *m, void *v)
static void nommu_region_list_stop(struct seq_file *m, void *v)
{
up_read(&nommu_vma_sem);
up_read(&nommu_region_sem);
}
static void *nommu_vma_list_next(struct seq_file *m, void *v, loff_t *pos)
static void *nommu_region_list_next(struct seq_file *m, void *v, loff_t *pos)
{
(*pos)++;
return rb_next((struct rb_node *) v);
}
static const struct seq_operations proc_nommu_vma_list_seqop = {
.start = nommu_vma_list_start,
.next = nommu_vma_list_next,
.stop = nommu_vma_list_stop,
.show = nommu_vma_list_show
static struct seq_operations proc_nommu_region_list_seqop = {
.start = nommu_region_list_start,
.next = nommu_region_list_next,
.stop = nommu_region_list_stop,
.show = nommu_region_list_show
};
static int proc_nommu_vma_list_open(struct inode *inode, struct file *file)
static int proc_nommu_region_list_open(struct inode *inode, struct file *file)
{
return seq_open(file, &proc_nommu_vma_list_seqop);
return seq_open(file, &proc_nommu_region_list_seqop);
}
static const struct file_operations proc_nommu_vma_list_operations = {
.open = proc_nommu_vma_list_open,
static const struct file_operations proc_nommu_region_list_operations = {
.open = proc_nommu_region_list_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
@ -137,7 +130,7 @@ static const struct file_operations proc_nommu_vma_list_operations = {
static int __init proc_nommu_init(void)
{
proc_create("maps", S_IRUGO, NULL, &proc_nommu_vma_list_operations);
proc_create("maps", S_IRUGO, NULL, &proc_nommu_region_list_operations);
return 0;
}

122
fs/proc/task_nommu.c
Просмотреть файл

@ -15,25 +15,32 @@
*/
void task_mem(struct seq_file *m, struct mm_struct *mm)
{
struct vm_list_struct *vml;
unsigned long bytes = 0, sbytes = 0, slack = 0;
struct vm_area_struct *vma;
struct vm_region *region;
struct rb_node *p;
unsigned long bytes = 0, sbytes = 0, slack = 0, size;
down_read(&mm->mmap_sem);
for (vml = mm->context.vmlist; vml; vml = vml->next) {
if (!vml->vma)
continue;
for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
vma = rb_entry(p, struct vm_area_struct, vm_rb);
bytes += kobjsize(vml);
if (atomic_read(&mm->mm_count) > 1 ||
atomic_read(&vml->vma->vm_usage) > 1
) {
sbytes += kobjsize((void *) vml->vma->vm_start);
sbytes += kobjsize(vml->vma);
bytes += kobjsize(vma);
region = vma->vm_region;
if (region) {
size = kobjsize(region);
size += region->vm_end - region->vm_start;
} else {
bytes += kobjsize((void *) vml->vma->vm_start);
bytes += kobjsize(vml->vma);
slack += kobjsize((void *) vml->vma->vm_start) -
(vml->vma->vm_end - vml->vma->vm_start);
size = vma->vm_end - vma->vm_start;
}
if (atomic_read(&mm->mm_count) > 1 ||
vma->vm_flags & VM_MAYSHARE) {
sbytes += size;
} else {
bytes += size;
if (region)
slack = region->vm_end - vma->vm_end;
}
}
@ -70,13 +77,14 @@ void task_mem(struct seq_file *m, struct mm_struct *mm)
unsigned long task_vsize(struct mm_struct *mm)
{
struct vm_list_struct *tbp;
struct vm_area_struct *vma;
struct rb_node *p;
unsigned long vsize = 0;
down_read(&mm->mmap_sem);
for (tbp = mm->context.vmlist; tbp; tbp = tbp->next) {
if (tbp->vma)
vsize += kobjsize((void *) tbp->vma->vm_start);
for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
vma = rb_entry(p, struct vm_area_struct, vm_rb);
vsize += vma->vm_end - vma->vm_start;
}
up_read(&mm->mmap_sem);
return vsize;
@ -85,15 +93,19 @@ unsigned long task_vsize(struct mm_struct *mm)
int task_statm(struct mm_struct *mm, int *shared, int *text,
int *data, int *resident)
{
struct vm_list_struct *tbp;
struct vm_area_struct *vma;
struct vm_region *region;
struct rb_node *p;
int size = kobjsize(mm);
down_read(&mm->mmap_sem);
for (tbp = mm->context.vmlist; tbp; tbp = tbp->next) {
size += kobjsize(tbp);
if (tbp->vma) {
size += kobjsize(tbp->vma);
size += kobjsize((void *) tbp->vma->vm_start);
for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
vma = rb_entry(p, struct vm_area_struct, vm_rb);
size += kobjsize(vma);
region = vma->vm_region;
if (region) {
size += kobjsize(region);
size += region->vm_end - region->vm_start;
}
}
@ -104,21 +116,63 @@ int task_statm(struct mm_struct *mm, int *shared, int *text,
return size;
}
/*
* display a single VMA to a sequenced file
*/
static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma)
{
unsigned long ino = 0;
struct file *file;
dev_t dev = 0;
int flags, len;
flags = vma->vm_flags;
file = vma->vm_file;
if (file) {
struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
dev = inode->i_sb->s_dev;
ino = inode->i_ino;
}
seq_printf(m,
"%08lx-%08lx %c%c%c%c %08lx %02x:%02x %lu %n",
vma->vm_start,
vma->vm_end,
flags & VM_READ ? 'r' : '-',
flags & VM_WRITE ? 'w' : '-',
flags & VM_EXEC ? 'x' : '-',
flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p',
vma->vm_pgoff << PAGE_SHIFT,
MAJOR(dev), MINOR(dev), ino, &len);
if (file) {
len = 25 + sizeof(void *) * 6 - len;
if (len < 1)
len = 1;
seq_printf(m, "%*c", len, ' ');
seq_path(m, &file->f_path, "");
}
seq_putc(m, '\n');
return 0;
}
/*
* display mapping lines for a particular process's /proc/pid/maps
*/
static int show_map(struct seq_file *m, void *_vml)
static int show_map(struct seq_file *m, void *_p)
{
struct vm_list_struct *vml = _vml;
struct rb_node *p = _p;
return nommu_vma_show(m, vml->vma);
return nommu_vma_show(m, rb_entry(p, struct vm_area_struct, vm_rb));
}
static void *m_start(struct seq_file *m, loff_t *pos)
{
struct proc_maps_private *priv = m->private;
struct vm_list_struct *vml;
struct mm_struct *mm;
struct rb_node *p;
loff_t n = *pos;
/* pin the task and mm whilst we play with them */
@ -134,9 +188,9 @@ static void *m_start(struct seq_file *m, loff_t *pos)
}
/* start from the Nth VMA */
for (vml = mm->context.vmlist; vml; vml = vml->next)
for (p = rb_first(&mm->mm_rb); p; p = rb_next(p))
if (n-- == 0)
return vml;
return p;
return NULL;
}
@ -152,12 +206,12 @@ static void m_stop(struct seq_file *m, void *_vml)
}
}
static void *m_next(struct seq_file *m, void *_vml, loff_t *pos)
static void *m_next(struct seq_file *m, void *_p, loff_t *pos)
{
struct vm_list_struct *vml = _vml;
struct rb_node *p = _p;
(*pos)++;
return vml ? vml->next : NULL;
return p ? rb_next(p) : NULL;
}
static const struct seq_operations proc_pid_maps_ops = {

21
fs/ramfs/file-nommu.c
Просмотреть файл

@ -262,11 +262,11 @@ unsigned long ramfs_nommu_get_unmapped_area(struct file *file,
ret = -ENOMEM;
pages = kzalloc(lpages * sizeof(struct page *), GFP_KERNEL);
if (!pages)
goto out;
goto out_free;
nr = find_get_pages(inode->i_mapping, pgoff, lpages, pages);
if (nr != lpages)
goto out; /* leave if some pages were missing */
goto out_free_pages; /* leave if some pages were missing */
/* check the pages for physical adjacency */
ptr = pages;
@ -274,19 +274,18 @@ unsigned long ramfs_nommu_get_unmapped_area(struct file *file,
page++;
for (loop = lpages; loop > 1; loop--)
if (*ptr++ != page++)
goto out;
goto out_free_pages;
/* okay - all conditions fulfilled */
ret = (unsigned long) page_address(pages[0]);
out:
if (pages) {
ptr = pages;
for (loop = lpages; loop > 0; loop--)
put_page(*ptr++);
kfree(pages);
}
out_free_pages:
ptr = pages;
for (loop = nr; loop > 0; loop--)
put_page(*ptr++);
out_free:
kfree(pages);
out:
return ret;
}

1
include/asm-frv/mmu.h
Просмотреть файл

@ -22,7 +22,6 @@ typedef struct {
unsigned long dtlb_ptd_mapping; /* [DAMR5] PTD mapping for dtlb cached PGE */
#else
struct vm_list_struct *vmlist;
unsigned long end_brk;
#endif

1
include/asm-m32r/mmu.h
Просмотреть файл

@ -4,7 +4,6 @@
#if !defined(CONFIG_MMU)
typedef struct {
struct vm_list_struct *vmlist;
unsigned long end_brk;
} mm_context_t;

18
include/linux/mm.h
Просмотреть файл

@ -56,19 +56,9 @@ extern unsigned long mmap_min_addr;
extern struct kmem_cache *vm_area_cachep;
/*
* This struct defines the per-mm list of VMAs for uClinux. If CONFIG_MMU is
* disabled, then there's a single shared list of VMAs maintained by the
* system, and mm's subscribe to these individually
*/
struct vm_list_struct {
struct vm_list_struct *next;
struct vm_area_struct *vma;
};
#ifndef CONFIG_MMU
extern struct rb_root nommu_vma_tree;
extern struct rw_semaphore nommu_vma_sem;
extern struct rb_root nommu_region_tree;
extern struct rw_semaphore nommu_region_sem;
extern unsigned int kobjsize(const void *objp);
#endif
@ -1061,6 +1051,7 @@ extern void memmap_init_zone(unsigned long, int, unsigned long,
unsigned long, enum memmap_context);
extern void setup_per_zone_pages_min(void);
extern void mem_init(void);
extern void __init mmap_init(void);
extern void show_mem(void);
extern void si_meminfo(struct sysinfo * val);
extern void si_meminfo_node(struct sysinfo *val, int nid);
@ -1072,6 +1063,9 @@ extern void setup_per_cpu_pageset(void);
static inline void setup_per_cpu_pageset(void) {}
#endif
/* nommu.c */
extern atomic_t mmap_pages_allocated;
/* prio_tree.c */
void vma_prio_tree_add(struct vm_area_struct *, struct vm_area_struct *old);
void vma_prio_tree_insert(struct vm_area_struct *, struct prio_tree_root *);

19
include/linux/mm_types.h
Просмотреть файл

@ -96,6 +96,23 @@ struct page {
#endif /* WANT_PAGE_VIRTUAL */
};
/*
* A region containing a mapping of a non-memory backed file under NOMMU
* conditions. These are held in a global tree and are pinned by the VMAs that
* map parts of them.
*/
struct vm_region {
struct rb_node vm_rb; /* link in global region tree */
unsigned long vm_flags; /* VMA vm_flags */
unsigned long vm_start; /* start address of region */
unsigned long vm_end; /* region initialised to here */
unsigned long vm_top; /* region allocated to here */
unsigned long vm_pgoff; /* the offset in vm_file corresponding to vm_start */
struct file *vm_file; /* the backing file or NULL */
atomic_t vm_usage; /* region usage count */
};
/*
* This struct defines a memory VMM memory area. There is one of these
* per VM-area/task. A VM area is any part of the process virtual memory
@ -152,7 +169,7 @@ struct vm_area_struct {
unsigned long vm_truncate_count;/* truncate_count or restart_addr */
#ifndef CONFIG_MMU
atomic_t vm_usage; /* refcount (VMAs shared if !MMU) */
struct vm_region *vm_region; /* NOMMU mapping region */
#endif
#ifdef CONFIG_NUMA
struct mempolicy *vm_policy; /* NUMA policy for the VMA */

1
init/initramfs.c
Просмотреть файл

@ -317,6 +317,7 @@ static int __init do_name(void)
if (wfd >= 0) {
sys_fchown(wfd, uid, gid);
sys_fchmod(wfd, mode);
sys_ftruncate(wfd, body_len);
vcollected = kstrdup(collected, GFP_KERNEL);
state = CopyFile;
}

12
ipc/shm.c
Просмотреть файл

@ -990,6 +990,7 @@ asmlinkage long sys_shmdt(char __user *shmaddr)
*/
vma = find_vma(mm, addr);
#ifdef CONFIG_MMU
while (vma) {
next = vma->vm_next;
@ -1034,6 +1035,17 @@ asmlinkage long sys_shmdt(char __user *shmaddr)
vma = next;
}
#else /* CONFIG_MMU */
/* under NOMMU conditions, the exact address to be destroyed must be
* given */
retval = -EINVAL;
if (vma->vm_start == addr && vma->vm_ops == &shm_vm_ops) {
do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start);
retval = 0;
}
#endif
up_write(&mm->mmap_sem);
return retval;
}

4
kernel/fork.c
Просмотреть файл

@ -1481,12 +1481,10 @@ void __init proc_caches_init(void)
fs_cachep = kmem_cache_create("fs_cache",
sizeof(struct fs_struct), 0,
SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
vm_area_cachep = kmem_cache_create("vm_area_struct",
sizeof(struct vm_area_struct), 0,
SLAB_PANIC, NULL);
mm_cachep = kmem_cache_create("mm_struct",
sizeof(struct mm_struct), ARCH_MIN_MMSTRUCT_ALIGN,
SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
mmap_init();
}
/*

14
kernel/sysctl.c
Просмотреть файл

@ -82,6 +82,9 @@ extern int percpu_pagelist_fraction;
extern int compat_log;
extern int latencytop_enabled;
extern int sysctl_nr_open_min, sysctl_nr_open_max;
#ifndef CONFIG_MMU
extern int sysctl_nr_trim_pages;
#endif
#ifdef CONFIG_RCU_TORTURE_TEST
extern int rcutorture_runnable;
#endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
@ -1102,6 +1105,17 @@ static struct ctl_table vm_table[] = {
.mode = 0644,
.proc_handler = &proc_dointvec
},
#else
{
.ctl_name = CTL_UNNUMBERED,
.procname = "nr_trim_pages",
.data = &sysctl_nr_trim_pages,
.maxlen = sizeof(sysctl_nr_trim_pages),
.mode = 0644,
.proc_handler = &proc_dointvec_minmax,
.strategy = &sysctl_intvec,
.extra1 = &zero,
},
#endif
{
.ctl_name = VM_LAPTOP_MODE,

7
lib/Kconfig.debug
Просмотреть файл

@ -512,6 +512,13 @@ config DEBUG_VIRTUAL
If unsure, say N.
config DEBUG_NOMMU_REGIONS
bool "Debug the global anon/private NOMMU mapping region tree"
depends on DEBUG_KERNEL && !MMU
help
This option causes the global tree of anonymous and private mapping
regions to be regularly checked for invalid topology.
config DEBUG_WRITECOUNT
bool "Debug filesystem writers count"
depends on DEBUG_KERNEL

10
mm/mmap.c
Просмотреть файл

@ -2472,3 +2472,13 @@ void mm_drop_all_locks(struct mm_struct *mm)
mutex_unlock(&mm_all_locks_mutex);
}
/*
* initialise the VMA slab
*/
void __init mmap_init(void)
{
vm_area_cachep = kmem_cache_create("vm_area_struct",
sizeof(struct vm_area_struct), 0,
SLAB_PANIC, NULL);
}

1079
mm/nommu.c
Просмотреть файл

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