#include <linux/mm.h> #include <linux/hugetlb.h> #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> #include <asm/elf.h> #include <asm/uaccess.h> #include <asm/tlbflush.h> #include "internal.h" char *task_mem(struct mm_struct *mm, char *buffer) { unsigned long data, text, lib; unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss; /* * 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 = get_mm_rss(mm); if (hiwater_rss < mm->hiwater_rss) hiwater_rss = mm->hiwater_rss; 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, "VmPeak:\t%8lu kB\n" "VmSize:\t%8lu kB\n" "VmLck:\t%8lu kB\n" "VmHWM:\t%8lu kB\n" "VmRSS:\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", hiwater_vm << (PAGE_SHIFT-10), (total_vm - mm->reserved_vm) << (PAGE_SHIFT-10), mm->locked_vm << (PAGE_SHIFT-10), hiwater_rss << (PAGE_SHIFT-10), total_rss << (PAGE_SHIFT-10), 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) { return PAGE_SIZE * mm->total_vm; } int task_statm(struct mm_struct *mm, int *shared, int *text, int *data, int *resident) { *shared = get_mm_counter(mm, file_rss); *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) >> PAGE_SHIFT; *data = mm->total_vm - mm->shared_vm; *resident = *shared + get_mm_counter(mm, anon_rss); return mm->total_vm; } int proc_exe_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt) { struct vm_area_struct * vma; int result = -ENOENT; struct task_struct *task = get_proc_task(inode); struct mm_struct * mm = NULL; if (task) { mm = get_task_mm(task); put_task_struct(task); } if (!mm) goto out; down_read(&mm->mmap_sem); vma = mm->mmap; while (vma) { if ((vma->vm_flags & VM_EXECUTABLE) && vma->vm_file) break; vma = vma->vm_next; } if (vma) { *mnt = mntget(vma->vm_file->f_path.mnt); *dentry = dget(vma->vm_file->f_path.dentry); result = 0; } up_read(&mm->mmap_sem); mmput(mm); out: return result; } static void pad_len_spaces(struct seq_file *m, int len) { len = 25 + sizeof(void*) * 6 - len; if (len < 1) len = 1; seq_printf(m, "%*c", len, ' '); } 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; }; struct pmd_walker { struct vm_area_struct *vma; void *private; void (*action)(struct vm_area_struct *, pmd_t *, unsigned long, unsigned long, void *); }; static int show_map_internal(struct seq_file *m, void *v, struct mem_size_stats *mss) { struct proc_maps_private *priv = m->private; struct task_struct *task = priv->task; struct vm_area_struct *vma = v; struct mm_struct *mm = vma->vm_mm; struct file *file = vma->vm_file; int flags = vma->vm_flags; unsigned long ino = 0; 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; 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 ? 's' : 'p', vma->vm_pgoff << PAGE_SHIFT, MAJOR(dev), MINOR(dev), ino, &len); /* * Print the dentry name for named mappings, and a * special [heap] marker for the heap: */ if (file) { pad_len_spaces(m, len); seq_path(m, file->f_path.mnt, file->f_path.dentry, "\n"); } else { const char *name = arch_vma_name(vma); if (!name) { if (mm) { if (vma->vm_start <= mm->start_brk && vma->vm_end >= mm->brk) { name = "[heap]"; } else if (vma->vm_start <= mm->start_stack && vma->vm_end >= mm->start_stack) { name = "[stack]"; } } else { name = "[vdso]"; } } if (name) { pad_len_spaces(m, len); seq_puts(m, name); } } 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) { 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, void *private) { struct mem_size_stats *mss = private; pte_t *pte, ptent; spinlock_t *ptl; struct page *page; 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; mss->resident += PAGE_SIZE; page = vm_normal_page(vma, addr, ptent); if (!page) continue; /* Accumulate the size in pages that have been accessed. */ if (pte_young(ptent) || PageReferenced(page)) mss->referenced += PAGE_SIZE; if (page_mapcount(page) >= 2) { if (pte_dirty(ptent)) mss->shared_dirty += PAGE_SIZE; else mss->shared_clean += PAGE_SIZE; } else { if (pte_dirty(ptent)) mss->private_dirty += PAGE_SIZE; else mss->private_clean += PAGE_SIZE; } } pte_unmap_unlock(pte - 1, ptl); cond_resched(); } static void clear_refs_pte_range(struct vm_area_struct *vma, pmd_t *pmd, unsigned long addr, unsigned long end, void *private) { pte_t *pte, ptent; spinlock_t *ptl; struct page *page; 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; page = vm_normal_page(vma, addr, ptent); if (!page) continue; /* Clear accessed and referenced bits. */ ptep_test_and_clear_young(vma, addr, pte); ClearPageReferenced(page); } pte_unmap_unlock(pte - 1, ptl); cond_resched(); } static inline void walk_pmd_range(struct pmd_walker *walker, pud_t *pud, unsigned long addr, unsigned long end) { pmd_t *pmd; unsigned long next; 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); } } 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; 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); } } /* * 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) { 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); } } 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); if (vma->vm_mm && !is_vm_hugetlb_page(vma)) walk_page_range(vma, smaps_pte_range, &mss); return show_map_internal(m, v, &mss); } void clear_refs_smap(struct mm_struct *mm) { struct vm_area_struct *vma; 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); } 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 = get_task_mm(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))) { 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 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); } } 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); } } 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, }; #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_checked }; static int numa_maps_open(struct inode *inode, struct file *file) { return do_maps_open(inode, file, &proc_pid_numa_maps_op); } const struct file_operations proc_numa_maps_operations = { .open = numa_maps_open, .read = seq_read, .llseek = seq_lseek, .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, };