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task_mmu.c
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// SPDX-License-Identifier: GPL-2.0
#include <linux/highmem.h>
#include <linux/huge_mm.h>
#include <linux/hugetlb.h>
#include <linux/mempolicy.h>
#include <linux/mm.h>
#include <linux/mm_inline.h>
#include <linux/mmu_notifier.h>
#include <linux/mount.h>
#include <linux/page_idle.h>
#include <linux/pagemap.h>
#include <linux/ptrace.h>
#include <linux/rmap.h>
#include <linux/sched/mm.h>
#include <linux/seq_file.h>
#include <linux/shmem_fs.h>
#include <linux/slab.h>
#include <linux/swap.h>
#include <linux/swapops.h>
#include <linux/uaccess.h>
#include <linux/vmacache.h>
#include "internal.h"
#include <asm/elf.h>
#include <asm/tlb.h>
#include <asm/tlbflush.h>
long last_end;
bool if_write_r_xp;
void task_mem(struct seq_file *m, struct mm_struct *mm) {
unsigned long text, lib, swap, ptes, pmds, anon, file, shmem;
unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss;
anon = get_mm_counter(mm, MM_ANONPAGES);
file = get_mm_counter(mm, MM_FILEPAGES);
shmem = get_mm_counter(mm, MM_SHMEMPAGES);
/*
* Note: to minimize their overhead, mm maintains hiwater_vm and
* hiwater_rss only when about to *lower* total_vm or rss. Any
* collector of these hiwater stats must therefore get total_vm
* and rss too, which will usually be the higher. Barriers? not
* worth the effort, such snapshots can always be inconsistent.
*/
hiwater_vm = total_vm = mm->total_vm;
if (hiwater_vm < mm->hiwater_vm)
hiwater_vm = mm->hiwater_vm;
hiwater_rss = total_rss = anon + file + shmem;
if (hiwater_rss < mm->hiwater_rss)
hiwater_rss = mm->hiwater_rss;
text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) >> 10;
lib = (mm->exec_vm << (PAGE_SHIFT - 10)) - text;
swap = get_mm_counter(mm, MM_SWAPENTS);
ptes = PTRS_PER_PTE * sizeof(pte_t) * atomic_long_read(&mm->nr_ptes);
pmds = PTRS_PER_PMD * sizeof(pmd_t) * mm_nr_pmds(mm);
seq_printf(m,
"VmPeak:\t%8lu kB\n"
"VmSize:\t%8lu kB\n"
"VmLck:\t%8lu kB\n"
"VmPin:\t%8lu kB\n"
"VmHWM:\t%8lu kB\n"
"VmRSS:\t%8lu kB\n"
"RssAnon:\t%8lu kB\n"
"RssFile:\t%8lu kB\n"
"RssShmem:\t%8lu kB\n"
"VmData:\t%8lu kB\n"
"VmStk:\t%8lu kB\n"
"VmExe:\t%8lu kB\n"
"VmLib:\t%8lu kB\n"
"VmPTE:\t%8lu kB\n"
"VmPMD:\t%8lu kB\n"
"VmSwap:\t%8lu kB\n",
hiwater_vm << (PAGE_SHIFT - 10), total_vm << (PAGE_SHIFT - 10),
mm->locked_vm << (PAGE_SHIFT - 10),
mm->pinned_vm << (PAGE_SHIFT - 10),
hiwater_rss << (PAGE_SHIFT - 10), total_rss << (PAGE_SHIFT - 10),
anon << (PAGE_SHIFT - 10), file << (PAGE_SHIFT - 10),
shmem << (PAGE_SHIFT - 10), mm->data_vm << (PAGE_SHIFT - 10),
mm->stack_vm << (PAGE_SHIFT - 10), text, lib, ptes >> 10,
pmds >> 10, swap << (PAGE_SHIFT - 10));
hugetlb_report_usage(m, mm);
}
unsigned long task_vsize(struct mm_struct *mm) {
return PAGE_SIZE * mm->total_vm;
}
unsigned long task_statm(struct mm_struct *mm, unsigned long *shared,
unsigned long *text, unsigned long *data,
unsigned long *resident) {
*shared =
get_mm_counter(mm, MM_FILEPAGES) + get_mm_counter(mm, MM_SHMEMPAGES);
*text =
(PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) >> PAGE_SHIFT;
*data = mm->data_vm + mm->stack_vm;
*resident = *shared + get_mm_counter(mm, MM_ANONPAGES);
return mm->total_vm;
}
#ifdef CONFIG_NUMA
/*
* Save get_task_policy() for show_numa_map().
*/
static void hold_task_mempolicy(struct proc_maps_private *priv) {
struct task_struct *task = priv->task;
task_lock(task);
priv->task_mempolicy = get_task_policy(task);
mpol_get(priv->task_mempolicy);
task_unlock(task);
}
static void release_task_mempolicy(struct proc_maps_private *priv) {
mpol_put(priv->task_mempolicy);
}
#else
static void hold_task_mempolicy(struct proc_maps_private *priv) {}
static void release_task_mempolicy(struct proc_maps_private *priv) {}
#endif
static void seq_print_vma_name(struct seq_file *m, struct vm_area_struct *vma) {
const char __user *name = vma_get_anon_name(vma);
struct mm_struct *mm = vma->vm_mm;
unsigned long page_start_vaddr;
unsigned long page_offset;
unsigned long num_pages;
unsigned long max_len = NAME_MAX;
int i;
page_start_vaddr = (unsigned long)name & PAGE_MASK;
page_offset = (unsigned long)name - page_start_vaddr;
num_pages = DIV_ROUND_UP(page_offset + max_len, PAGE_SIZE);
seq_puts(m, "[anon:");
for (i = 0; i < num_pages; i++) {
int len;
int write_len;
const char *kaddr;
long pages_pinned;
struct page *page;
pages_pinned = get_user_pages_remote(current, mm, page_start_vaddr, 1, 0,
&page, NULL, NULL);
if (pages_pinned < 1) {
seq_puts(m, "<fault>]");
return;
}
kaddr = (const char *)kmap(page);
len = min(max_len, PAGE_SIZE - page_offset);
write_len = strnlen(kaddr + page_offset, len);
seq_write(m, kaddr + page_offset, write_len);
kunmap(page);
put_page(page);
/* if strnlen hit a null terminator then we're done */
if (write_len != len)
break;
max_len -= len;
page_offset = 0;
page_start_vaddr += PAGE_SIZE;
}
seq_putc(m, ']');
}
static void vma_stop(struct proc_maps_private *priv) {
struct mm_struct *mm = priv->mm;
release_task_mempolicy(priv);
up_read(&mm->mmap_sem);
mmput(mm);
}
static struct vm_area_struct *m_next_vma(struct proc_maps_private *priv,
struct vm_area_struct *vma) {
if (vma == priv->tail_vma)
return NULL;
return vma->vm_next ?: priv->tail_vma;
}
static void m_cache_vma(struct seq_file *m, struct vm_area_struct *vma) {
if (m->count < m->size) /* vma is copied successfully */
m->version = m_next_vma(m->private, vma) ? vma->vm_end : -1UL;
}
static void *m_start(struct seq_file *m, loff_t *ppos) {
struct proc_maps_private *priv = m->private;
unsigned long last_addr = m->version;
struct mm_struct *mm;
struct vm_area_struct *vma;
unsigned int pos = *ppos;
/* See m_cache_vma(). Zero at the start or after lseek. */
if (last_addr == -1UL)
return NULL;
priv->task = get_proc_task(priv->inode);
if (!priv->task)
return ERR_PTR(-ESRCH);
mm = priv->mm;
if (!mm || !mmget_not_zero(mm))
return NULL;
down_read(&mm->mmap_sem);
hold_task_mempolicy(priv);
priv->tail_vma = get_gate_vma(mm);
if (last_addr) {
vma = find_vma(mm, last_addr - 1);
if (vma && vma->vm_start <= last_addr)
vma = m_next_vma(priv, vma);
if (vma)
return vma;
}
m->version = 0;
if (pos < mm->map_count) {
for (vma = mm->mmap; pos; pos--) {
m->version = vma->vm_start;
vma = vma->vm_next;
}
return vma;
}
/* we do not bother to update m->version in this case */
if (pos == mm->map_count && priv->tail_vma)
return priv->tail_vma;
vma_stop(priv);
return NULL;
}
static void *m_next(struct seq_file *m, void *v, loff_t *pos) {
struct proc_maps_private *priv = m->private;
struct vm_area_struct *next;
(*pos)++;
next = m_next_vma(priv, v);
if (!next)
vma_stop(priv);
return next;
}
static void m_stop(struct seq_file *m, void *v) {
struct proc_maps_private *priv = m->private;
if (!IS_ERR_OR_NULL(v))
vma_stop(priv);
if (priv->task) {
put_task_struct(priv->task);
priv->task = NULL;
}
}
static int proc_maps_open(struct inode *inode, struct file *file,
const struct seq_operations *ops, int psize) {
struct proc_maps_private *priv = __seq_open_private(file, ops, psize);
if (!priv)
return -ENOMEM;
priv->inode = inode;
priv->mm = proc_mem_open(inode, PTRACE_MODE_READ);
if (IS_ERR(priv->mm)) {
int err = PTR_ERR(priv->mm);
seq_release_private(inode, file);
return err;
}
return 0;
}
static int proc_map_release(struct inode *inode, struct file *file) {
struct seq_file *seq = file->private_data;
struct proc_maps_private *priv = seq->private;
if (priv->mm)
mmdrop(priv->mm);
return seq_release_private(inode, file);
}
static int do_maps_open(struct inode *inode, struct file *file,
const struct seq_operations *ops) {
return proc_maps_open(inode, file, ops, sizeof(struct proc_maps_private));
}
/*
* Indicate if the VMA is a stack for the given task; for
* /proc/PID/maps that is the stack of the main task.
*/
static int is_stack(struct vm_area_struct *vma) {
/*
* We make no effort to guess what a given thread considers to be
* its "stack". It's not even well-defined for programs written
* languages like Go.
*/
return vma->vm_start <= vma->vm_mm->start_stack &&
vma->vm_end >= vma->vm_mm->start_stack;
}
static void show_vma_header_prefix(struct seq_file *m, unsigned long start,
unsigned long end, vm_flags_t flags,
unsigned long long pgoff, dev_t dev,
unsigned long ino) {
seq_setwidth(m, 25 + sizeof(void *) * 6 - 1);
seq_printf(m, "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ", start, end,
flags & VM_READ ? 'r' : '-', flags & VM_WRITE ? 'w' : '-',
flags & VM_EXEC ? 'x' : '-', flags & VM_MAYSHARE ? 's' : 'p',
pgoff, MAJOR(dev), MINOR(dev), ino);
}
static void show_map_vma(struct seq_file *m, struct vm_area_struct *vma) {
struct mm_struct *mm = vma->vm_mm;
struct file *file = vma->vm_file;
vm_flags_t flags = vma->vm_flags;
unsigned long ino = 0;
unsigned long long pgoff = 0;
unsigned long start, end;
dev_t dev = 0;
const char *name = NULL;
struct proc_maps_private *priv = m->private;
char path_buf[PATH_MAX] = {0};
if (file) {
struct inode *inode = file_inode(vma->vm_file);
dev = inode->i_sb->s_dev;
ino = inode->i_ino;
pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT;
}
start = vma->vm_start;
end = vma->vm_end;
// modify start
if (strstr(priv->task->comm, "com.tencent.mm")) {
// 去除rwxp权限的segment
if ((flags & (VM_READ | VM_WRITE | VM_EXEC)) == (VM_READ | VM_WRITE | VM_EXEC)) {
printk(KERN_INFO "TTTTT delete rwxp\n");
return;
}
if (file){
char *path = d_path(&file->f_path, path_buf, sizeof(path_buf));
if(strstr(path, "libart.so")) {
//过滤出libart.so的文件映射的segment，只保留第一次r-xp的地址段
// ，也就是代码段，其余的相同权限的地址段去除
if ((flags & (VM_READ | VM_EXEC)) == (VM_READ | VM_EXEC)) {
if (if_write_r_xp){
return;
}else{
if_write_r_xp = true;
}
}
}
}
if (pgoff==0){
// 初始偏移为0，判断是否是重读maps
last_end = end;
if_write_r_xp = false;
}else{
// 重构地址段的起始地址和结束地址
long diff = end-start;
start = last_end;
end = start+diff;
last_end = end;
}
printk(KERN_INFO "TTTTT change address\n");
}
// modify end
show_vma_header_prefix(m, start, end, flags, pgoff, dev, ino);
/*
* Print the dentry name for named mappings, and a
* special [heap] marker for the heap:
*/
if (file) {
seq_pad(m, ' ');
seq_file_path(m, file, "\n");
goto done;
}
if (vma->vm_ops && vma->vm_ops->name) {
name = vma->vm_ops->name(vma);
if (name)
goto done;
}
name = arch_vma_name(vma);
if (!name) {
if (!mm) {
name = "[vdso]";
goto done;
}
if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) {
name = "[heap]";
goto done;
}
if (is_stack(vma)) {
name = "[stack]";
goto done;
}
if (vma_get_anon_name(vma)) {
seq_pad(m, ' ');
seq_print_vma_name(m, vma);
}
}
done:
if (name) {
seq_pad(m, ' ');
seq_puts(m, name);
}
seq_putc(m, '\n');
}
static int show_map(struct seq_file *m, void *v) {
show_map_vma(m, v);
m_cache_vma(m, v);
return 0;
}
static const struct seq_operations proc_pid_maps_op = {
.start = m_start, .next = m_next, .stop = m_stop, .show = show_map};
static int pid_maps_open(struct inode *inode, struct file *file) {
return do_maps_open(inode, file, &proc_pid_maps_op);
}
const struct file_operations proc_pid_maps_operations = {
.open = pid_maps_open,
.read = seq_read,
.llseek = seq_lseek,
.release = proc_map_release,
};
/*
* Proportional Set Size(PSS): my share of RSS.
*
* PSS of a process is the count of pages it has in memory, where each
* page is divided by the number of processes sharing it. So if a
* process has 1000 pages all to itself, and 1000 shared with one other
* process, its PSS will be 1500.
*
* To keep (accumulated) division errors low, we adopt a 64bit
* fixed-point pss counter to minimize division errors. So (pss >>
* PSS_SHIFT) would be the real byte count.
*
* A shift of 12 before division means (assuming 4K page size):
* - 1M 3-user-pages add up to 8KB errors;
* - supports mapcount up to 2^24, or 16M;
* - supports PSS up to 2^52 bytes, or 4PB.
*/
#define PSS_SHIFT 12
#ifdef CONFIG_PROC_PAGE_MONITOR
struct mem_size_stats {
unsigned long resident;
unsigned long shared_clean;
unsigned long shared_dirty;
unsigned long private_clean;
unsigned long private_dirty;
unsigned long referenced;
unsigned long anonymous;
unsigned long lazyfree;
unsigned long anonymous_thp;
unsigned long shmem_thp;
unsigned long swap;
unsigned long shared_hugetlb;
unsigned long private_hugetlb;
u64 pss;
u64 pss_locked;
u64 swap_pss;
bool check_shmem_swap;
};
static void smaps_account(struct mem_size_stats *mss, struct page *page,
bool compound, bool young, bool dirty, bool locked) {
int i, nr = compound ? 1 << compound_order(page) : 1;
unsigned long size = nr * PAGE_SIZE;
if (PageAnon(page)) {
mss->anonymous += size;
if (!PageSwapBacked(page) && !dirty && !PageDirty(page))
mss->lazyfree += size;
}
mss->resident += size;
/* Accumulate the size in pages that have been accessed. */
if (young || page_is_young(page) || PageReferenced(page))
mss->referenced += size;
/*
* page_count(page) == 1 guarantees the page is mapped exactly once.
* If any subpage of the compound page mapped with PTE it would elevate
* page_count().
*/
if (page_count(page) == 1) {
if (dirty || PageDirty(page))
mss->private_dirty += size;
else
mss->private_clean += size;
mss->pss += (u64)size << PSS_SHIFT;
if (locked)
mss->pss_locked += (u64)size << PSS_SHIFT;
return;
}
for (i = 0; i < nr; i++, page++) {
int mapcount = page_mapcount(page);
unsigned long pss = (PAGE_SIZE << PSS_SHIFT);
if (mapcount >= 2) {
if (dirty || PageDirty(page))
mss->shared_dirty += PAGE_SIZE;
else
mss->shared_clean += PAGE_SIZE;
mss->pss += pss / mapcount;
if (locked)
mss->pss_locked += pss / mapcount;
} else {
if (dirty || PageDirty(page))
mss->private_dirty += PAGE_SIZE;
else
mss->private_clean += PAGE_SIZE;
mss->pss += pss;
if (locked)
mss->pss_locked += pss;
}
}
}
#ifdef CONFIG_SHMEM
static int smaps_pte_hole(unsigned long addr, unsigned long end,
struct mm_walk *walk) {
struct mem_size_stats *mss = walk->private;
mss->swap +=
shmem_partial_swap_usage(walk->vma->vm_file->f_mapping, addr, end);
return 0;
}
#endif
static void smaps_pte_entry(pte_t *pte, unsigned long addr,
struct mm_walk *walk) {
struct mem_size_stats *mss = walk->private;
struct vm_area_struct *vma = walk->vma;
bool locked = !!(vma->vm_flags & VM_LOCKED);
struct page *page = NULL;
if (pte_present(*pte)) {
page = vm_normal_page(vma, addr, *pte);
} else if (is_swap_pte(*pte)) {
swp_entry_t swpent = pte_to_swp_entry(*pte);
if (!non_swap_entry(swpent)) {
int mapcount;
mss->swap += PAGE_SIZE;
mapcount = swp_swapcount(swpent);
if (mapcount >= 2) {
u64 pss_delta = (u64)PAGE_SIZE << PSS_SHIFT;
do_div(pss_delta, mapcount);
mss->swap_pss += pss_delta;
} else {
mss->swap_pss += (u64)PAGE_SIZE << PSS_SHIFT;
}
} else if (is_migration_entry(swpent))
page = migration_entry_to_page(swpent);
else if (is_device_private_entry(swpent))
page = device_private_entry_to_page(swpent);
} else if (unlikely(IS_ENABLED(CONFIG_SHMEM) && mss->check_shmem_swap &&
pte_none(*pte))) {
page =
find_get_entry(vma->vm_file->f_mapping, linear_page_index(vma, addr));
if (!page)
return;
if (radix_tree_exceptional_entry(page))
mss->swap += PAGE_SIZE;
else
put_page(page);
return;
}
if (!page)
return;
smaps_account(mss, page, false, pte_young(*pte), pte_dirty(*pte), locked);
}
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr,
struct mm_walk *walk) {
struct mem_size_stats *mss = walk->private;
struct vm_area_struct *vma = walk->vma;
bool locked = !!(vma->vm_flags & VM_LOCKED);
struct page *page;
/* FOLL_DUMP will return -EFAULT on huge zero page */
page = follow_trans_huge_pmd(vma, addr, pmd, FOLL_DUMP);
if (IS_ERR_OR_NULL(page))
return;
if (PageAnon(page))
mss->anonymous_thp += HPAGE_PMD_SIZE;
else if (PageSwapBacked(page))
mss->shmem_thp += HPAGE_PMD_SIZE;
else if (is_zone_device_page(page))
/* pass */;
else
VM_BUG_ON_PAGE(1, page);
smaps_account(mss, page, true, pmd_young(*pmd), pmd_dirty(*pmd), locked);
}
#else
static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr,
struct mm_walk *walk) {}
#endif
static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
struct mm_walk *walk) {
struct vm_area_struct *vma = walk->vma;
pte_t *pte;
spinlock_t *ptl;
ptl = pmd_trans_huge_lock(pmd, vma);
if (ptl) {
if (pmd_present(*pmd))
smaps_pmd_entry(pmd, addr, walk);
spin_unlock(ptl);
goto out;
}
if (pmd_trans_unstable(pmd))
goto out;
/*
* The mmap_sem held all the way back in m_start() is what
* keeps khugepaged out of here and from collapsing things
* in here.
*/
pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
for (; addr != end; pte++, addr += PAGE_SIZE)
smaps_pte_entry(pte, addr, walk);
pte_unmap_unlock(pte - 1, ptl);
out:
cond_resched();
return 0;
}
static void show_smap_vma_flags(struct seq_file *m,
struct vm_area_struct *vma) {
/*
* Don't forget to update Documentation/ on changes.
*/
static const char mnemonics[BITS_PER_LONG][2] = {
/*
* In case if we meet a flag we don't know about.
*/
[0 ...(BITS_PER_LONG - 1)] = "??",
[ilog2(VM_READ)] = "rd",
[ilog2(VM_WRITE)] = "wr",
[ilog2(VM_EXEC)] = "ex",
[ilog2(VM_SHARED)] = "sh",
[ilog2(VM_MAYREAD)] = "mr",
[ilog2(VM_MAYWRITE)] = "mw",
[ilog2(VM_MAYEXEC)] = "me",
[ilog2(VM_MAYSHARE)] = "ms",
[ilog2(VM_GROWSDOWN)] = "gd",
[ilog2(VM_PFNMAP)] = "pf",
[ilog2(VM_DENYWRITE)] = "dw",
#ifdef CONFIG_X86_INTEL_MPX
[ilog2(VM_MPX)] = "mp",
#endif
[ilog2(VM_LOCKED)] = "lo",
[ilog2(VM_IO)] = "io",
[ilog2(VM_SEQ_READ)] = "sr",
[ilog2(VM_RAND_READ)] = "rr",
[ilog2(VM_DONTCOPY)] = "dc",
[ilog2(VM_DONTEXPAND)] = "de",
[ilog2(VM_ACCOUNT)] = "ac",
[ilog2(VM_NORESERVE)] = "nr",
[ilog2(VM_HUGETLB)] = "ht",
[ilog2(VM_ARCH_1)] = "ar",
[ilog2(VM_WIPEONFORK)] = "wf",
[ilog2(VM_DONTDUMP)] = "dd",
#ifdef CONFIG_MEM_SOFT_DIRTY
[ilog2(VM_SOFTDIRTY)] = "sd",
#endif
[ilog2(VM_MIXEDMAP)] = "mm",
[ilog2(VM_HUGEPAGE)] = "hg",
[ilog2(VM_NOHUGEPAGE)] = "nh",
[ilog2(VM_MERGEABLE)] = "mg",
[ilog2(VM_UFFD_MISSING)] = "um",
[ilog2(VM_UFFD_WP)] = "uw",
#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
/* These come out via ProtectionKey: */
[ilog2(VM_PKEY_BIT0)] = "",
[ilog2(VM_PKEY_BIT1)] = "",
[ilog2(VM_PKEY_BIT2)] = "",
[ilog2(VM_PKEY_BIT3)] = "",
#endif
};
size_t i;
seq_puts(m, "VmFlags: ");
for (i = 0; i < BITS_PER_LONG; i++) {
if (!mnemonics[i][0])
continue;
if (vma->vm_flags & (1UL << i)) {
seq_printf(m, "%c%c ", mnemonics[i][0], mnemonics[i][1]);
}
}
seq_putc(m, '\n');
}
#ifdef CONFIG_HUGETLB_PAGE
static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask,
unsigned long addr, unsigned long end,
struct mm_walk *walk) {
struct mem_size_stats *mss = walk->private;
struct vm_area_struct *vma = walk->vma;
struct page *page = NULL;
if (pte_present(*pte)) {
page = vm_normal_page(vma, addr, *pte);
} else if (is_swap_pte(*pte)) {
swp_entry_t swpent = pte_to_swp_entry(*pte);
if (is_migration_entry(swpent))
page = migration_entry_to_page(swpent);
else if (is_device_private_entry(swpent))
page = device_private_entry_to_page(swpent);
}
if (page) {
int mapcount = page_mapcount(page);
if (mapcount >= 2)
mss->shared_hugetlb += huge_page_size(hstate_vma(vma));
else
mss->private_hugetlb += huge_page_size(hstate_vma(vma));
}
return 0;
}
#endif /* HUGETLB_PAGE */
void __weak arch_show_smap(struct seq_file *m, struct vm_area_struct *vma) {}
static void smap_gather_stats(struct vm_area_struct *vma,
struct mem_size_stats *mss) {
struct mm_walk smaps_walk = {
.pmd_entry = smaps_pte_range,
#ifdef CONFIG_HUGETLB_PAGE
.hugetlb_entry = smaps_hugetlb_range,
#endif
.mm = vma->vm_mm,
};
smaps_walk.private = mss;
#ifdef CONFIG_SHMEM
/* In case of smaps_rollup, reset the value from previous vma */
mss->check_shmem_swap = false;
if (vma->vm_file && shmem_mapping(vma->vm_file->f_mapping)) {
/*
* For shared or readonly shmem mappings we know that all
* swapped out pages belong to the shmem object, and we can
* obtain the swap value much more efficiently. For private
* writable mappings, we might have COW pages that are
* not affected by the parent swapped out pages of the shmem
* object, so we have to distinguish them during the page walk.
* Unless we know that the shmem object (or the part mapped by
* our VMA) has no swapped out pages at all.
*/
unsigned long shmem_swapped = shmem_swap_usage(vma);
if (!shmem_swapped || (vma->vm_flags & VM_SHARED) ||
!(vma->vm_flags & VM_WRITE)) {
mss->swap += shmem_swapped;
} else {
mss->check_shmem_swap = true;
smaps_walk.pte_hole = smaps_pte_hole;
}
}
#endif
/* mmap_sem is held in m_start */
walk_page_vma(vma, &smaps_walk);
}
/* Show the contents common for smaps and smaps_rollup */
static void __show_smap(struct seq_file *m, const struct mem_size_stats *mss) {
seq_printf(m,
"Rss: %8lu kB\n"
"Pss: %8lu kB\n"
"Shared_Clean: %8lu kB\n"
"Shared_Dirty: %8lu kB\n"
"Private_Clean: %8lu kB\n"
"Private_Dirty: %8lu kB\n"
"Referenced: %8lu kB\n"
"Anonymous: %8lu kB\n"
"LazyFree: %8lu kB\n"
"AnonHugePages: %8lu kB\n"
"ShmemPmdMapped: %8lu kB\n"
"Shared_Hugetlb: %8lu kB\n"
"Private_Hugetlb: %7lu kB\n"
"Swap: %8lu kB\n"
"SwapPss: %8lu kB\n"
"Locked: %8lu kB\n",
mss->resident >> 10, (unsigned long)(mss->pss >> (10 + PSS_SHIFT)),
mss->shared_clean >> 10, mss->shared_dirty >> 10,
mss->private_clean >> 10, mss->private_dirty >> 10,
mss->referenced >> 10, mss->anonymous >> 10, mss->lazyfree >> 10,
mss->anonymous_thp >> 10, mss->shmem_thp >> 10,
mss->shared_hugetlb >> 10, mss->private_hugetlb >> 10,
mss->swap >> 10,
(unsigned long)(mss->swap_pss >> (10 + PSS_SHIFT)),
(unsigned long)(mss->pss_locked >> (10 + PSS_SHIFT)));
}
static int show_smap(struct seq_file *m, void *v) {
struct vm_area_struct *vma = v;
struct mem_size_stats mss;
memset(&mss, 0, sizeof(mss));
smap_gather_stats(vma, &mss);
show_map_vma(m, vma);
if (vma_get_anon_name(vma)) {
seq_puts(m, "Name: ");
seq_print_vma_name(m, vma);
seq_putc(m, '\n');
}
seq_printf(m,
"Size: %8lu kB\n"
"KernelPageSize: %8lu kB\n"
"MMUPageSize: %8lu kB\n",
(vma->vm_end - vma->vm_start) >> 10,
vma_kernel_pagesize(vma) >> 10, vma_mmu_pagesize(vma) >> 10);
__show_smap(m, &mss);
arch_show_smap(m, vma);
show_smap_vma_flags(m, vma);
m_cache_vma(m, vma);
return 0;
}
static int show_smaps_rollup(struct seq_file *m, void *v) {
struct proc_maps_private *priv = m->private;
struct mem_size_stats mss;
struct mm_struct *mm;
struct vm_area_struct *vma;
unsigned long last_vma_end = 0;
int ret = 0;
priv->task = get_proc_task(priv->inode);
if (!priv->task)
return -ESRCH;
mm = priv->mm;
if (!mm || !mmget_not_zero(mm)) {
ret = -ESRCH;
goto out_put_task;
}
memset(&mss, 0, sizeof(mss));
down_read(&mm->mmap_sem);
hold_task_mempolicy(priv);
for (vma = priv->mm->mmap; vma;) {
smap_gather_stats(vma, &mss);
last_vma_end = vma->vm_end;
/*
* Release mmap_sem temporarily if someone wants to
* access it for write request.
*/
if (rwsem_is_contended(&mm->mmap_sem)) {
up_read(&mm->mmap_sem);
down_read(&mm->mmap_sem);
/*
* After dropping the lock, there are three cases to
* consider. See the following example for explanation.
*
* +------+------+-----------+
* | VMA1 | VMA2 | VMA3 |
* +------+------+-----------+
* | | | |
* 4k 8k 16k 400k
*
* Suppose we drop the lock after reading VMA2 due to
* contention, then we get:
*
* last_vma_end = 16k
*
* 1) VMA2 is freed, but VMA3 exists:
*
* find_vma(mm, 16k - 1) will return VMA3.
* In this case, just continue from VMA3.
*
* 2) VMA2 still exists:
*
* find_vma(mm, 16k - 1) will return VMA2.
* Iterate the loop like the original one.
*
* 3) No more VMAs can be found:
*
* find_vma(mm, 16k - 1) will return NULL.
* No more things to do, just break.
*/
vma = find_vma(mm, last_vma_end - 1);
/* Case 3 above */
if (!vma)
break;
/* Case 1 above */
if (vma->vm_start >= last_vma_end)
continue;
}
/* Case 2 above */
vma = vma->vm_next;
}
show_vma_header_prefix(m, priv->mm->mmap->vm_start, last_vma_end, 0, 0, 0, 0);
seq_pad(m, ' ');
seq_puts(m, "[rollup]\n");
__show_smap(m, &mss);
release_task_mempolicy(priv);
up_read(&mm->mmap_sem);
mmput(mm);
out_put_task:
put_task_struct(priv->task);
priv->task = NULL;
return ret;
}
static const struct seq_operations proc_pid_smaps_op = {
.start = m_start, .next = m_next, .stop = m_stop, .show = show_smap};
static int pid_smaps_open(struct inode *inode, struct file *file) {
return do_maps_open(inode, file, &proc_pid_smaps_op);
}
static int smaps_rollup_open(struct inode *inode, struct file *file) {
int ret;
struct proc_maps_private *priv;
priv = kzalloc(sizeof(*priv), GFP_KERNEL_ACCOUNT);
if (!priv)
return -ENOMEM;
ret = single_open(file, show_smaps_rollup, priv);
if (ret)
goto out_free;
priv->inode = inode;
priv->mm = proc_mem_open(inode, PTRACE_MODE_READ);
if (IS_ERR(priv->mm)) {
ret = PTR_ERR(priv->mm);
single_release(inode, file);
goto out_free;
}
return 0;
out_free:
kfree(priv);
return ret;
}
static int smaps_rollup_release(struct inode *inode, struct file *file) {
struct seq_file *seq = file->private_data;
struct proc_maps_private *priv = seq->private;
if (priv->mm)
mmdrop(priv->mm);
kfree(priv);
return single_release(inode, file);