#include <linux/mount.h>
#include <linux/seq_file.h>
#include <linux/highmem.h>
+#include <linux/ptrace.h>
#include <linux/pagemap.h>
#include <linux/mempolicy.h>
seq_printf(m, "%*c", len, ' ');
}
+/*
+ * 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
+
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 show_map_internal(struct seq_file *m, void *v, struct mem_size_stats *mss)
+static int show_map(struct seq_file *m, void *v)
{
struct proc_maps_private *priv = m->private;
struct task_struct *task = priv->task;
dev_t dev = 0;
int len;
+ if (maps_protect && !ptrace_may_attach(task))
+ return -EACCES;
+
if (file) {
struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
dev = inode->i_sb->s_dev;
}
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",
- (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);
-
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)
-{
- return show_map_internal(m, v, NULL);
-}
-
-static void smaps_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
- unsigned long addr, unsigned long end,
- struct mem_size_stats *mss)
+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);
- do {
+ for (; addr != end; pte++, addr += PAGE_SIZE) {
ptent = *pte;
if (!pte_present(ptent))
continue;
if (!page)
continue;
- if (page_mapcount(page) >= 2) {
+ /* Accumulate the size in pages that have been accessed. */
+ if (pte_young(ptent) || PageReferenced(page))
+ mss->referenced += PAGE_SIZE;
+ 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);
}
- } while (pte++, addr += PAGE_SIZE, addr != end);
+ }
pte_unmap_unlock(pte - 1, ptl);
cond_resched();
+ return 0;
}
-static inline void smaps_pmd_range(struct vm_area_struct *vma, pud_t *pud,
- unsigned long addr, unsigned long end,
- struct mem_size_stats *mss)
+static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
+ unsigned long end, void *private)
{
- pmd_t *pmd;
- unsigned long next;
+ struct vm_area_struct *vma = private;
+ pte_t *pte, ptent;
+ spinlock_t *ptl;
+ struct page *page;
- pmd = pmd_offset(pud, addr);
- do {
- next = pmd_addr_end(addr, end);
- if (pmd_none_or_clear_bad(pmd))
+ pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
+ for (; addr != end; pte++, addr += PAGE_SIZE) {
+ ptent = *pte;
+ if (!pte_present(ptent))
continue;
- smaps_pte_range(vma, pmd, addr, next, mss);
- } while (pmd++, addr = next, addr != end);
-}
-
-static inline void smaps_pud_range(struct vm_area_struct *vma, pgd_t *pgd,
- unsigned long addr, unsigned long end,
- struct mem_size_stats *mss)
-{
- pud_t *pud;
- unsigned long next;
- pud = pud_offset(pgd, addr);
- do {
- next = pud_addr_end(addr, end);
- if (pud_none_or_clear_bad(pud))
+ page = vm_normal_page(vma, addr, ptent);
+ if (!page)
continue;
- smaps_pmd_range(vma, pud, addr, next, mss);
- } while (pud++, addr = next, addr != end);
-}
-static inline void smaps_pgd_range(struct vm_area_struct *vma,
- unsigned long addr, unsigned long end,
- struct mem_size_stats *mss)
-{
- pgd_t *pgd;
- unsigned long next;
-
- pgd = pgd_offset(vma->vm_mm, addr);
- do {
- next = pgd_addr_end(addr, end);
- if (pgd_none_or_clear_bad(pgd))
- continue;
- smaps_pud_range(vma, pgd, addr, next, mss);
- } while (pgd++, addr = next, addr != end);
+ /* Clear accessed and referenced bits. */
+ ptep_test_and_clear_young(vma, addr, pte);
+ ClearPageReferenced(page);
+ }
+ 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))
- smaps_pgd_range(vma, vma->vm_start, vma->vm_end, &mss);
- return show_map_internal(m, v, &mss);
+ 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 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)
+{
+ struct task_struct *task;
+ char buffer[PROC_NUMBUF], *end;
+ struct mm_struct *mm;
+ struct vm_area_struct *vma;
+
+ 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;
+}
+
+const struct file_operations proc_clear_refs_operations = {
+ .write = clear_refs_write,
+};
+
static void *m_start(struct seq_file *m, loff_t *pos)
{
struct proc_maps_private *priv = m->private;
if (!priv->task)
return NULL;
- mm = get_task_mm(priv->task);
+ mm = mm_for_maps(priv->task);
if (!mm)
return NULL;
priv->tail_vma = tail_vma = get_gate_vma(priv->task);
- down_read(&mm->mmap_sem);
/* Start with last addr hint */
if (last_addr && (vma = find_vma(mm, last_addr))) {
return do_maps_open(inode, file, &proc_pid_maps_op);
}
-struct file_operations proc_maps_operations = {
+const struct file_operations proc_maps_operations = {
.open = maps_open,
.read = seq_read,
.llseek = seq_lseek,
#ifdef CONFIG_NUMA
extern int show_numa_map(struct seq_file *m, void *v);
+static int show_numa_map_checked(struct seq_file *m, void *v)
+{
+ struct proc_maps_private *priv = m->private;
+ struct task_struct *task = priv->task;
+
+ if (maps_protect && !ptrace_may_attach(task))
+ return -EACCES;
+
+ return show_numa_map(m, v);
+}
+
static struct seq_operations proc_pid_numa_maps_op = {
.start = m_start,
.next = m_next,
.stop = m_stop,
- .show = show_numa_map
+ .show = show_numa_map_checked
};
static int numa_maps_open(struct inode *inode, struct file *file)
return do_maps_open(inode, file, &proc_pid_numa_maps_op);
}
-struct file_operations proc_numa_maps_operations = {
+const struct file_operations proc_numa_maps_operations = {
.open = numa_maps_open,
.read = seq_read,
.llseek = seq_lseek,
return do_maps_open(inode, file, &proc_pid_smaps_op);
}
-struct file_operations proc_smaps_operations = {
+const struct file_operations proc_smaps_operations = {
.open = smaps_open,
.read = seq_read,
.llseek = seq_lseek,