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-rw-r--r--fs/proc/task_mmu.c692
1 files changed, 444 insertions, 248 deletions
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 8043a3eab52..49958cffbd8 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -5,14 +5,18 @@
#include <linux/highmem.h>
#include <linux/ptrace.h>
#include <linux/pagemap.h>
+#include <linux/ptrace.h>
#include <linux/mempolicy.h>
+#include <linux/swap.h>
+#include <linux/swapops.h>
+#include <linux/seq_file.h>
#include <asm/elf.h>
#include <asm/uaccess.h>
#include <asm/tlbflush.h>
#include "internal.h"
-char *task_mem(struct mm_struct *mm, char *buffer)
+void task_mem(struct seq_file *m, struct mm_struct *mm)
{
unsigned long data, text, lib;
unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss;
@@ -34,7 +38,7 @@ char *task_mem(struct mm_struct *mm, char *buffer)
data = mm->total_vm - mm->shared_vm - mm->stack_vm;
text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) >> 10;
lib = (mm->exec_vm << (PAGE_SHIFT-10)) - text;
- buffer += sprintf(buffer,
+ seq_printf(m,
"VmPeak:\t%8lu kB\n"
"VmSize:\t%8lu kB\n"
"VmLck:\t%8lu kB\n"
@@ -53,7 +57,6 @@ char *task_mem(struct mm_struct *mm, char *buffer)
data << (PAGE_SHIFT-10),
mm->stack_vm << (PAGE_SHIFT-10), text, lib,
(PTRS_PER_PTE*sizeof(pte_t)*mm->nr_ptes) >> 10);
- return buffer;
}
unsigned long task_vsize(struct mm_struct *mm)
@@ -72,7 +75,7 @@ int task_statm(struct mm_struct *mm, int *shared, int *text,
return mm->total_vm;
}
-int proc_exe_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
+int proc_exe_link(struct inode *inode, struct path *path)
{
struct vm_area_struct * vma;
int result = -ENOENT;
@@ -95,8 +98,8 @@ int proc_exe_link(struct inode *inode, struct dentry **dentry, struct vfsmount *
}
if (vma) {
- *mnt = mntget(vma->vm_file->f_path.mnt);
- *dentry = dget(vma->vm_file->f_path.dentry);
+ *path = vma->vm_file->f_path;
+ path_get(&vma->vm_file->f_path);
result = 0;
}
@@ -114,24 +117,124 @@ static void pad_len_spaces(struct seq_file *m, int len)
seq_printf(m, "%*c", len, ' ');
}
-struct mem_size_stats
+static void vma_stop(struct proc_maps_private *priv, struct vm_area_struct *vma)
{
- unsigned long resident;
- unsigned long shared_clean;
- unsigned long shared_dirty;
- unsigned long private_clean;
- unsigned long private_dirty;
- unsigned long referenced;
-};
+ if (vma && vma != priv->tail_vma) {
+ struct mm_struct *mm = vma->vm_mm;
+ up_read(&mm->mmap_sem);
+ mmput(mm);
+ }
+}
-struct pmd_walker {
- struct vm_area_struct *vma;
- void *private;
- void (*action)(struct vm_area_struct *, pmd_t *, unsigned long,
- unsigned long, void *);
-};
+static void *m_start(struct seq_file *m, loff_t *pos)
+{
+ struct proc_maps_private *priv = m->private;
+ unsigned long last_addr = m->version;
+ struct mm_struct *mm;
+ struct vm_area_struct *vma, *tail_vma = NULL;
+ loff_t l = *pos;
+
+ /* Clear the per syscall fields in priv */
+ priv->task = NULL;
+ priv->tail_vma = NULL;
+
+ /*
+ * We remember last_addr rather than next_addr to hit with
+ * mmap_cache most of the time. We have zero last_addr at
+ * the beginning and also after lseek. We will have -1 last_addr
+ * after the end of the vmas.
+ */
+
+ if (last_addr == -1UL)
+ return NULL;
+
+ priv->task = get_pid_task(priv->pid, PIDTYPE_PID);
+ if (!priv->task)
+ return NULL;
+
+ mm = mm_for_maps(priv->task);
+ if (!mm)
+ return NULL;
+
+ tail_vma = get_gate_vma(priv->task);
+ priv->tail_vma = tail_vma;
+
+ /* Start with last addr hint */
+ vma = find_vma(mm, last_addr);
+ if (last_addr && vma) {
+ vma = vma->vm_next;
+ goto out;
+ }
+
+ /*
+ * Check the vma index is within the range and do
+ * sequential scan until m_index.
+ */
+ vma = NULL;
+ if ((unsigned long)l < mm->map_count) {
+ vma = mm->mmap;
+ while (l-- && vma)
+ vma = vma->vm_next;
+ goto out;
+ }
+
+ if (l != mm->map_count)
+ tail_vma = NULL; /* After gate vma */
+
+out:
+ if (vma)
+ return vma;
+
+ /* End of vmas has been reached */
+ m->version = (tail_vma != NULL)? 0: -1UL;
+ up_read(&mm->mmap_sem);
+ mmput(mm);
+ return tail_vma;
+}
+
+static void *m_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ struct proc_maps_private *priv = m->private;
+ struct vm_area_struct *vma = v;
+ struct vm_area_struct *tail_vma = priv->tail_vma;
+
+ (*pos)++;
+ if (vma && (vma != tail_vma) && vma->vm_next)
+ return vma->vm_next;
+ vma_stop(priv, vma);
+ return (vma != tail_vma)? tail_vma: NULL;
+}
-static int show_map_internal(struct seq_file *m, void *v, struct mem_size_stats *mss)
+static void m_stop(struct seq_file *m, void *v)
+{
+ struct proc_maps_private *priv = m->private;
+ struct vm_area_struct *vma = v;
+
+ vma_stop(priv, vma);
+ if (priv->task)
+ put_task_struct(priv->task);
+}
+
+static int do_maps_open(struct inode *inode, struct file *file,
+ const struct seq_operations *ops)
+{
+ struct proc_maps_private *priv;
+ int ret = -ENOMEM;
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ if (priv) {
+ priv->pid = proc_pid(inode);
+ ret = seq_open(file, ops);
+ if (!ret) {
+ struct seq_file *m = file->private_data;
+ m->private = priv;
+ } else {
+ kfree(priv);
+ }
+ }
+ return ret;
+}
+
+static int show_map(struct seq_file *m, void *v)
{
struct proc_maps_private *priv = m->private;
struct task_struct *task = priv->task;
@@ -168,7 +271,7 @@ static int show_map_internal(struct seq_file *m, void *v, struct mem_size_stats
*/
if (file) {
pad_len_spaces(m, len);
- seq_path(m, file->f_path.mnt, file->f_path.dentry, "\n");
+ seq_path(m, &file->f_path, "\n");
} else {
const char *name = arch_vma_name(vma);
if (!name) {
@@ -191,41 +294,71 @@ static int show_map_internal(struct seq_file *m, void *v, struct mem_size_stats
}
seq_putc(m, '\n');
- if (mss)
- seq_printf(m,
- "Size: %8lu kB\n"
- "Rss: %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",
- (vma->vm_end - vma->vm_start) >> 10,
- mss->resident >> 10,
- mss->shared_clean >> 10,
- mss->shared_dirty >> 10,
- mss->private_clean >> 10,
- mss->private_dirty >> 10,
- mss->referenced >> 10);
-
if (m->count < m->size) /* vma is copied successfully */
m->version = (vma != get_gate_vma(task))? vma->vm_start: 0;
return 0;
}
-static int show_map(struct seq_file *m, void *v)
+static const struct seq_operations proc_pid_maps_op = {
+ .start = m_start,
+ .next = m_next,
+ .stop = m_stop,
+ .show = show_map
+};
+
+static int maps_open(struct inode *inode, struct file *file)
{
- return show_map_internal(m, v, NULL);
+ return do_maps_open(inode, file, &proc_pid_maps_op);
}
-static void smaps_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
- unsigned long addr, unsigned long end,
- void *private)
+const struct file_operations proc_maps_operations = {
+ .open = maps_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release_private,
+};
+
+/*
+ * 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
+{
+ struct vm_area_struct *vma;
+ unsigned long resident;
+ unsigned long shared_clean;
+ unsigned long shared_dirty;
+ unsigned long private_clean;
+ unsigned long private_dirty;
+ unsigned long referenced;
+ u64 pss;
+};
+
+static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
+ void *private)
{
struct mem_size_stats *mss = private;
+ struct vm_area_struct *vma = mss->vma;
pte_t *pte, ptent;
spinlock_t *ptl;
struct page *page;
+ int mapcount;
pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
for (; addr != end; pte++, addr += PAGE_SIZE) {
@@ -242,26 +375,88 @@ static void smaps_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
/* Accumulate the size in pages that have been accessed. */
if (pte_young(ptent) || PageReferenced(page))
mss->referenced += PAGE_SIZE;
- if (page_mapcount(page) >= 2) {
+ mapcount = page_mapcount(page);
+ if (mapcount >= 2) {
if (pte_dirty(ptent))
mss->shared_dirty += PAGE_SIZE;
else
mss->shared_clean += PAGE_SIZE;
+ mss->pss += (PAGE_SIZE << PSS_SHIFT) / mapcount;
} else {
if (pte_dirty(ptent))
mss->private_dirty += PAGE_SIZE;
else
mss->private_clean += PAGE_SIZE;
+ mss->pss += (PAGE_SIZE << PSS_SHIFT);
}
}
pte_unmap_unlock(pte - 1, ptl);
cond_resched();
+ return 0;
+}
+
+static struct mm_walk smaps_walk = { .pmd_entry = smaps_pte_range };
+
+static int show_smap(struct seq_file *m, void *v)
+{
+ struct vm_area_struct *vma = v;
+ struct mem_size_stats mss;
+ int ret;
+
+ memset(&mss, 0, sizeof mss);
+ mss.vma = vma;
+ if (vma->vm_mm && !is_vm_hugetlb_page(vma))
+ walk_page_range(vma->vm_mm, vma->vm_start, vma->vm_end,
+ &smaps_walk, &mss);
+
+ ret = show_map(m, v);
+ if (ret)
+ return ret;
+
+ seq_printf(m,
+ "Size: %8lu kB\n"
+ "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",
+ (vma->vm_end - vma->vm_start) >> 10,
+ 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);
+
+ 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 smaps_open(struct inode *inode, struct file *file)
+{
+ return do_maps_open(inode, file, &proc_pid_smaps_op);
}
-static void clear_refs_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
- unsigned long addr, unsigned long end,
- void *private)
+const struct file_operations proc_smaps_operations = {
+ .open = smaps_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release_private,
+};
+
+static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
+ unsigned long end, void *private)
{
+ struct vm_area_struct *vma = private;
pte_t *pte, ptent;
spinlock_t *ptl;
struct page *page;
@@ -282,235 +477,248 @@ static void clear_refs_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
}
pte_unmap_unlock(pte - 1, ptl);
cond_resched();
+ return 0;
}
-static inline void walk_pmd_range(struct pmd_walker *walker, pud_t *pud,
- unsigned long addr, unsigned long end)
+static struct mm_walk clear_refs_walk = { .pmd_entry = clear_refs_pte_range };
+
+static ssize_t clear_refs_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
{
- pmd_t *pmd;
- unsigned long next;
+ struct task_struct *task;
+ char buffer[PROC_NUMBUF], *end;
+ struct mm_struct *mm;
+ struct vm_area_struct *vma;
- for (pmd = pmd_offset(pud, addr); addr != end;
- pmd++, addr = next) {
- next = pmd_addr_end(addr, end);
- if (pmd_none_or_clear_bad(pmd))
- continue;
- walker->action(walker->vma, pmd, addr, next, walker->private);
+ memset(buffer, 0, sizeof(buffer));
+ if (count > sizeof(buffer) - 1)
+ count = sizeof(buffer) - 1;
+ if (copy_from_user(buffer, buf, count))
+ return -EFAULT;
+ if (!simple_strtol(buffer, &end, 0))
+ return -EINVAL;
+ if (*end == '\n')
+ end++;
+ task = get_proc_task(file->f_path.dentry->d_inode);
+ if (!task)
+ return -ESRCH;
+ mm = get_task_mm(task);
+ if (mm) {
+ down_read(&mm->mmap_sem);
+ for (vma = mm->mmap; vma; vma = vma->vm_next)
+ if (!is_vm_hugetlb_page(vma))
+ walk_page_range(mm, vma->vm_start, vma->vm_end,
+ &clear_refs_walk, vma);
+ flush_tlb_mm(mm);
+ up_read(&mm->mmap_sem);
+ mmput(mm);
}
+ put_task_struct(task);
+ if (end - buffer == 0)
+ return -EIO;
+ return end - buffer;
}
-static inline void walk_pud_range(struct pmd_walker *walker, pgd_t *pgd,
- unsigned long addr, unsigned long end)
-{
- pud_t *pud;
- unsigned long next;
+const struct file_operations proc_clear_refs_operations = {
+ .write = clear_refs_write,
+};
- for (pud = pud_offset(pgd, addr); addr != end;
- pud++, addr = next) {
- next = pud_addr_end(addr, end);
- if (pud_none_or_clear_bad(pud))
- continue;
- walk_pmd_range(walker, pud, addr, next);
+struct pagemapread {
+ char __user *out, *end;
+};
+
+#define PM_ENTRY_BYTES sizeof(u64)
+#define PM_RESERVED_BITS 3
+#define PM_RESERVED_OFFSET (64 - PM_RESERVED_BITS)
+#define PM_RESERVED_MASK (((1LL<<PM_RESERVED_BITS)-1) << PM_RESERVED_OFFSET)
+#define PM_SPECIAL(nr) (((nr) << PM_RESERVED_OFFSET) | PM_RESERVED_MASK)
+#define PM_NOT_PRESENT PM_SPECIAL(1LL)
+#define PM_SWAP PM_SPECIAL(2LL)
+#define PM_END_OF_BUFFER 1
+
+static int add_to_pagemap(unsigned long addr, u64 pfn,
+ struct pagemapread *pm)
+{
+ /*
+ * Make sure there's room in the buffer for an
+ * entire entry. Otherwise, only copy part of
+ * the pfn.
+ */
+ if (pm->out + PM_ENTRY_BYTES >= pm->end) {
+ if (copy_to_user(pm->out, &pfn, pm->end - pm->out))
+ return -EFAULT;
+ pm->out = pm->end;
+ return PM_END_OF_BUFFER;
}
+
+ if (put_user(pfn, pm->out))
+ return -EFAULT;
+ pm->out += PM_ENTRY_BYTES;
+ return 0;
}
-/*
- * walk_page_range - walk the page tables of a VMA with a callback
- * @vma - VMA to walk
- * @action - callback invoked for every bottom-level (PTE) page table
- * @private - private data passed to the callback function
- *
- * Recursively walk the page table for the memory area in a VMA, calling
- * a callback for every bottom-level (PTE) page table.
- */
-static inline void walk_page_range(struct vm_area_struct *vma,
- void (*action)(struct vm_area_struct *,
- pmd_t *, unsigned long,
- unsigned long, void *),
- void *private)
+static int pagemap_pte_hole(unsigned long start, unsigned long end,
+ void *private)
{
- unsigned long addr = vma->vm_start;
- unsigned long end = vma->vm_end;
- struct pmd_walker walker = {
- .vma = vma,
- .private = private,
- .action = action,
- };
- pgd_t *pgd;
- unsigned long next;
-
- for (pgd = pgd_offset(vma->vm_mm, addr); addr != end;
- pgd++, addr = next) {
- next = pgd_addr_end(addr, end);
- if (pgd_none_or_clear_bad(pgd))
- continue;
- walk_pud_range(&walker, pgd, addr, next);
+ struct pagemapread *pm = private;
+ unsigned long addr;
+ int err = 0;
+ for (addr = start; addr < end; addr += PAGE_SIZE) {
+ err = add_to_pagemap(addr, PM_NOT_PRESENT, pm);
+ if (err)
+ break;
}
+ return err;
}
-static int show_smap(struct seq_file *m, void *v)
+u64 swap_pte_to_pagemap_entry(pte_t pte)
{
- struct vm_area_struct *vma = v;
- struct mem_size_stats mss;
-
- memset(&mss, 0, sizeof mss);
- if (vma->vm_mm && !is_vm_hugetlb_page(vma))
- walk_page_range(vma, smaps_pte_range, &mss);
- return show_map_internal(m, v, &mss);
+ swp_entry_t e = pte_to_swp_entry(pte);
+ return PM_SWAP | swp_type(e) | (swp_offset(e) << MAX_SWAPFILES_SHIFT);
}
-void clear_refs_smap(struct mm_struct *mm)
+static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
+ void *private)
{
- struct vm_area_struct *vma;
+ struct pagemapread *pm = private;
+ pte_t *pte;
+ int err = 0;
+
+ for (; addr != end; addr += PAGE_SIZE) {
+ u64 pfn = PM_NOT_PRESENT;
+ pte = pte_offset_map(pmd, addr);
+ if (is_swap_pte(*pte))
+ pfn = swap_pte_to_pagemap_entry(*pte);
+ else if (pte_present(*pte))
+ pfn = pte_pfn(*pte);
+ /* unmap so we're not in atomic when we copy to userspace */
+ pte_unmap(pte);
+ err = add_to_pagemap(addr, pfn, pm);
+ if (err)
+ return err;
+ }
- down_read(&mm->mmap_sem);
- for (vma = mm->mmap; vma; vma = vma->vm_next)
- if (vma->vm_mm && !is_vm_hugetlb_page(vma))
- walk_page_range(vma, clear_refs_pte_range, NULL);
- flush_tlb_mm(mm);
- up_read(&mm->mmap_sem);
+ cond_resched();
+
+ return err;
}
-static void *m_start(struct seq_file *m, loff_t *pos)
+static struct mm_walk pagemap_walk = {
+ .pmd_entry = pagemap_pte_range,
+ .pte_hole = pagemap_pte_hole
+};
+
+/*
+ * /proc/pid/pagemap - an array mapping virtual pages to pfns
+ *
+ * For each page in the address space, this file contains one 64-bit
+ * entry representing the corresponding physical page frame number
+ * (PFN) if the page is present. If there is a swap entry for the
+ * physical page, then an encoding of the swap file number and the
+ * page's offset into the swap file are returned. If no page is
+ * present at all, PM_NOT_PRESENT is returned. This allows determining
+ * precisely which pages are mapped (or in swap) and comparing mapped
+ * pages between processes.
+ *
+ * Efficient users of this interface will use /proc/pid/maps to
+ * determine which areas of memory are actually mapped and llseek to
+ * skip over unmapped regions.
+ */
+static ssize_t pagemap_read(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
{
- struct proc_maps_private *priv = m->private;
- unsigned long last_addr = m->version;
+ struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
+ struct page **pages, *page;
+ unsigned long uaddr, uend;
struct mm_struct *mm;
- struct vm_area_struct *vma, *tail_vma = NULL;
- loff_t l = *pos;
-
- /* Clear the per syscall fields in priv */
- priv->task = NULL;
- priv->tail_vma = NULL;
+ struct pagemapread pm;
+ int pagecount;
+ int ret = -ESRCH;
- /*
- * We remember last_addr rather than next_addr to hit with
- * mmap_cache most of the time. We have zero last_addr at
- * the beginning and also after lseek. We will have -1 last_addr
- * after the end of the vmas.
- */
+ if (!task)
+ goto out;
- if (last_addr == -1UL)
- return NULL;
+ ret = -EACCES;
+ if (!ptrace_may_attach(task))
+ goto out;
- priv->task = get_pid_task(priv->pid, PIDTYPE_PID);
- if (!priv->task)
- return NULL;
+ ret = -EINVAL;
+ /* file position must be aligned */
+ if (*ppos % PM_ENTRY_BYTES)
+ goto out;
- mm = mm_for_maps(priv->task);
+ ret = 0;
+ mm = get_task_mm(task);
if (!mm)
- return NULL;
-
- priv->tail_vma = tail_vma = get_gate_vma(priv->task);
-
- /* Start with last addr hint */
- if (last_addr && (vma = find_vma(mm, last_addr))) {
- vma = vma->vm_next;
goto out;
- }
- /*
- * Check the vma index is within the range and do
- * sequential scan until m_index.
- */
- vma = NULL;
- if ((unsigned long)l < mm->map_count) {
- vma = mm->mmap;
- while (l-- && vma)
- vma = vma->vm_next;
- goto out;
- }
+ ret = -ENOMEM;
+ uaddr = (unsigned long)buf & PAGE_MASK;
+ uend = (unsigned long)(buf + count);
+ pagecount = (PAGE_ALIGN(uend) - uaddr) / PAGE_SIZE;
+ pages = kmalloc(pagecount * sizeof(struct page *), GFP_KERNEL);
+ if (!pages)
+ goto out_task;
- if (l != mm->map_count)
- tail_vma = NULL; /* After gate vma */
+ down_read(&current->mm->mmap_sem);
+ ret = get_user_pages(current, current->mm, uaddr, pagecount,
+ 1, 0, pages, NULL);
+ up_read(&current->mm->mmap_sem);
-out:
- if (vma)
- return vma;
+ if (ret < 0)
+ goto out_free;
- /* End of vmas has been reached */
- m->version = (tail_vma != NULL)? 0: -1UL;
- up_read(&mm->mmap_sem);
- mmput(mm);
- return tail_vma;
-}
+ pm.out = buf;
+ pm.end = buf + count;
-static void vma_stop(struct proc_maps_private *priv, struct vm_area_struct *vma)
-{
- if (vma && vma != priv->tail_vma) {
- struct mm_struct *mm = vma->vm_mm;
- up_read(&mm->mmap_sem);
- mmput(mm);
+ if (!ptrace_may_attach(task)) {
+ ret = -EIO;
+ } else {
+ unsigned long src = *ppos;
+ unsigned long svpfn = src / PM_ENTRY_BYTES;
+ unsigned long start_vaddr = svpfn << PAGE_SHIFT;
+ unsigned long end_vaddr = TASK_SIZE_OF(task);
+
+ /* watch out for wraparound */
+ if (svpfn > TASK_SIZE_OF(task) >> PAGE_SHIFT)
+ start_vaddr = end_vaddr;
+
+ /*
+ * The odds are that this will stop walking way
+ * before end_vaddr, because the length of the
+ * user buffer is tracked in "pm", and the walk
+ * will stop when we hit the end of the buffer.
+ */
+ ret = walk_page_range(mm, start_vaddr, end_vaddr,
+ &pagemap_walk, &pm);
+ if (ret == PM_END_OF_BUFFER)
+ ret = 0;
+ /* don't need mmap_sem for these, but this looks cleaner */
+ *ppos += pm.out - buf;
+ if (!ret)
+ ret = pm.out - buf;
}
-}
-
-static void *m_next(struct seq_file *m, void *v, loff_t *pos)
-{
- struct proc_maps_private *priv = m->private;
- struct vm_area_struct *vma = v;
- struct vm_area_struct *tail_vma = priv->tail_vma;
-
- (*pos)++;
- if (vma && (vma != tail_vma) && vma->vm_next)
- return vma->vm_next;
- vma_stop(priv, vma);
- return (vma != tail_vma)? tail_vma: NULL;
-}
-
-static void m_stop(struct seq_file *m, void *v)
-{
- struct proc_maps_private *priv = m->private;
- struct vm_area_struct *vma = v;
-
- vma_stop(priv, vma);
- if (priv->task)
- put_task_struct(priv->task);
-}
-
-static struct seq_operations proc_pid_maps_op = {
- .start = m_start,
- .next = m_next,
- .stop = m_stop,
- .show = show_map
-};
-
-static struct seq_operations proc_pid_smaps_op = {
- .start = m_start,
- .next = m_next,
- .stop = m_stop,
- .show = show_smap
-};
-static int do_maps_open(struct inode *inode, struct file *file,
- struct seq_operations *ops)
-{
- struct proc_maps_private *priv;
- int ret = -ENOMEM;
- priv = kzalloc(sizeof(*priv), GFP_KERNEL);
- if (priv) {
- priv->pid = proc_pid(inode);
- ret = seq_open(file, ops);
- if (!ret) {
- struct seq_file *m = file->private_data;
- m->private = priv;
- } else {
- kfree(priv);
- }
+ for (; pagecount; pagecount--) {
+ page = pages[pagecount-1];
+ if (!PageReserved(page))
+ SetPageDirty(page);
+ page_cache_release(page);
}
+ mmput(mm);
+out_free:
+ kfree(pages);
+out_task:
+ put_task_struct(task);
+out:
return ret;
}
-static int maps_open(struct inode *inode, struct file *file)
-{
- return do_maps_open(inode, file, &proc_pid_maps_op);
-}
-
-const struct file_operations proc_maps_operations = {
- .open = maps_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = seq_release_private,
+const struct file_operations proc_pagemap_operations = {
+ .llseek = mem_lseek, /* borrow this */
+ .read = pagemap_read,
};
+#endif /* CONFIG_PROC_PAGE_MONITOR */
#ifdef CONFIG_NUMA
extern int show_numa_map(struct seq_file *m, void *v);
@@ -526,7 +734,7 @@ static int show_numa_map_checked(struct seq_file *m, void *v)
return show_numa_map(m, v);
}
-static struct seq_operations proc_pid_numa_maps_op = {
+static const struct seq_operations proc_pid_numa_maps_op = {
.start = m_start,
.next = m_next,
.stop = m_stop,
@@ -545,15 +753,3 @@ const struct file_operations proc_numa_maps_operations = {
.release = seq_release_private,
};
#endif
-
-static int smaps_open(struct inode *inode, struct file *file)
-{
- return do_maps_open(inode, file, &proc_pid_smaps_op);
-}
-
-const struct file_operations proc_smaps_operations = {
- .open = smaps_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = seq_release_private,
-};