Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #include <linux/mm.h> |
Davidlohr Bueso | 615d6e8 | 2014-04-07 15:37:25 -0700 | [diff] [blame] | 2 | #include <linux/vmacache.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | #include <linux/hugetlb.h> |
Dave Hansen | 22e057c | 2011-03-22 16:33:00 -0700 | [diff] [blame] | 4 | #include <linux/huge_mm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | #include <linux/mount.h> |
| 6 | #include <linux/seq_file.h> |
Mauricio Lin | e070ad4 | 2005-09-03 15:55:10 -0700 | [diff] [blame] | 7 | #include <linux/highmem.h> |
Kees Cook | 5096add | 2007-05-08 00:26:04 -0700 | [diff] [blame] | 8 | #include <linux/ptrace.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 9 | #include <linux/slab.h> |
Christoph Lameter | 6e21c8f | 2005-09-03 15:54:45 -0700 | [diff] [blame] | 10 | #include <linux/pagemap.h> |
| 11 | #include <linux/mempolicy.h> |
Dave Hansen | 22e057c | 2011-03-22 16:33:00 -0700 | [diff] [blame] | 12 | #include <linux/rmap.h> |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 13 | #include <linux/swap.h> |
| 14 | #include <linux/swapops.h> |
Pavel Emelyanov | 0f8975e | 2013-07-03 15:01:20 -0700 | [diff] [blame] | 15 | #include <linux/mmu_notifier.h> |
Vladimir Davydov | 33c3fc7 | 2015-09-09 15:35:45 -0700 | [diff] [blame] | 16 | #include <linux/page_idle.h> |
Vlastimil Babka | 6a15a37 | 2016-01-14 15:19:20 -0800 | [diff] [blame] | 17 | #include <linux/shmem_fs.h> |
Minchan Kim | ff92689 | 2013-05-09 16:21:24 +0900 | [diff] [blame] | 18 | #include <linux/mm_inline.h> |
Mauricio Lin | e070ad4 | 2005-09-03 15:55:10 -0700 | [diff] [blame] | 19 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <asm/elf.h> |
| 21 | #include <asm/uaccess.h> |
Mauricio Lin | e070ad4 | 2005-09-03 15:55:10 -0700 | [diff] [blame] | 22 | #include <asm/tlbflush.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include "internal.h" |
| 24 | |
Eric W. Biederman | df5f831 | 2008-02-08 04:18:33 -0800 | [diff] [blame] | 25 | void task_mem(struct seq_file *m, struct mm_struct *mm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | { |
Konstantin Khlebnikov | 8463833 | 2016-01-14 15:22:07 -0800 | [diff] [blame] | 27 | unsigned long text, lib, swap, ptes, pmds, anon, file, shmem; |
Hugh Dickins | 365e9c87 | 2005-10-29 18:16:18 -0700 | [diff] [blame] | 28 | unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss; |
| 29 | |
Jerome Marchand | 8cee852 | 2016-01-14 15:19:29 -0800 | [diff] [blame] | 30 | anon = get_mm_counter(mm, MM_ANONPAGES); |
| 31 | file = get_mm_counter(mm, MM_FILEPAGES); |
| 32 | shmem = get_mm_counter(mm, MM_SHMEMPAGES); |
| 33 | |
Hugh Dickins | 365e9c87 | 2005-10-29 18:16:18 -0700 | [diff] [blame] | 34 | /* |
| 35 | * Note: to minimize their overhead, mm maintains hiwater_vm and |
| 36 | * hiwater_rss only when about to *lower* total_vm or rss. Any |
| 37 | * collector of these hiwater stats must therefore get total_vm |
| 38 | * and rss too, which will usually be the higher. Barriers? not |
| 39 | * worth the effort, such snapshots can always be inconsistent. |
| 40 | */ |
| 41 | hiwater_vm = total_vm = mm->total_vm; |
| 42 | if (hiwater_vm < mm->hiwater_vm) |
| 43 | hiwater_vm = mm->hiwater_vm; |
Jerome Marchand | 8cee852 | 2016-01-14 15:19:29 -0800 | [diff] [blame] | 44 | hiwater_rss = total_rss = anon + file + shmem; |
Hugh Dickins | 365e9c87 | 2005-10-29 18:16:18 -0700 | [diff] [blame] | 45 | if (hiwater_rss < mm->hiwater_rss) |
| 46 | hiwater_rss = mm->hiwater_rss; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) >> 10; |
| 49 | lib = (mm->exec_vm << (PAGE_SHIFT-10)) - text; |
KAMEZAWA Hiroyuki | b084d43 | 2010-03-05 13:41:42 -0800 | [diff] [blame] | 50 | swap = get_mm_counter(mm, MM_SWAPENTS); |
Kirill A. Shutemov | dc6c9a3 | 2015-02-11 15:26:50 -0800 | [diff] [blame] | 51 | ptes = PTRS_PER_PTE * sizeof(pte_t) * atomic_long_read(&mm->nr_ptes); |
| 52 | pmds = PTRS_PER_PMD * sizeof(pmd_t) * mm_nr_pmds(mm); |
Eric W. Biederman | df5f831 | 2008-02-08 04:18:33 -0800 | [diff] [blame] | 53 | seq_printf(m, |
Hugh Dickins | 365e9c87 | 2005-10-29 18:16:18 -0700 | [diff] [blame] | 54 | "VmPeak:\t%8lu kB\n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | "VmSize:\t%8lu kB\n" |
| 56 | "VmLck:\t%8lu kB\n" |
Christoph Lameter | bc3e53f | 2011-10-31 17:07:30 -0700 | [diff] [blame] | 57 | "VmPin:\t%8lu kB\n" |
Hugh Dickins | 365e9c87 | 2005-10-29 18:16:18 -0700 | [diff] [blame] | 58 | "VmHWM:\t%8lu kB\n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | "VmRSS:\t%8lu kB\n" |
Jerome Marchand | 8cee852 | 2016-01-14 15:19:29 -0800 | [diff] [blame] | 60 | "RssAnon:\t%8lu kB\n" |
| 61 | "RssFile:\t%8lu kB\n" |
| 62 | "RssShmem:\t%8lu kB\n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | "VmData:\t%8lu kB\n" |
| 64 | "VmStk:\t%8lu kB\n" |
| 65 | "VmExe:\t%8lu kB\n" |
| 66 | "VmLib:\t%8lu kB\n" |
KAMEZAWA Hiroyuki | b084d43 | 2010-03-05 13:41:42 -0800 | [diff] [blame] | 67 | "VmPTE:\t%8lu kB\n" |
Kirill A. Shutemov | dc6c9a3 | 2015-02-11 15:26:50 -0800 | [diff] [blame] | 68 | "VmPMD:\t%8lu kB\n" |
KAMEZAWA Hiroyuki | b084d43 | 2010-03-05 13:41:42 -0800 | [diff] [blame] | 69 | "VmSwap:\t%8lu kB\n", |
Hugh Dickins | 365e9c87 | 2005-10-29 18:16:18 -0700 | [diff] [blame] | 70 | hiwater_vm << (PAGE_SHIFT-10), |
Konstantin Khlebnikov | 314e51b | 2012-10-08 16:29:02 -0700 | [diff] [blame] | 71 | total_vm << (PAGE_SHIFT-10), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | mm->locked_vm << (PAGE_SHIFT-10), |
Christoph Lameter | bc3e53f | 2011-10-31 17:07:30 -0700 | [diff] [blame] | 73 | mm->pinned_vm << (PAGE_SHIFT-10), |
Hugh Dickins | 365e9c87 | 2005-10-29 18:16:18 -0700 | [diff] [blame] | 74 | hiwater_rss << (PAGE_SHIFT-10), |
| 75 | total_rss << (PAGE_SHIFT-10), |
Jerome Marchand | 8cee852 | 2016-01-14 15:19:29 -0800 | [diff] [blame] | 76 | anon << (PAGE_SHIFT-10), |
| 77 | file << (PAGE_SHIFT-10), |
| 78 | shmem << (PAGE_SHIFT-10), |
Konstantin Khlebnikov | 8463833 | 2016-01-14 15:22:07 -0800 | [diff] [blame] | 79 | mm->data_vm << (PAGE_SHIFT-10), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | mm->stack_vm << (PAGE_SHIFT-10), text, lib, |
Kirill A. Shutemov | dc6c9a3 | 2015-02-11 15:26:50 -0800 | [diff] [blame] | 81 | ptes >> 10, |
| 82 | pmds >> 10, |
KAMEZAWA Hiroyuki | b084d43 | 2010-03-05 13:41:42 -0800 | [diff] [blame] | 83 | swap << (PAGE_SHIFT-10)); |
Naoya Horiguchi | 5d317b2 | 2015-11-05 18:47:14 -0800 | [diff] [blame] | 84 | hugetlb_report_usage(m, mm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | } |
| 86 | |
| 87 | unsigned long task_vsize(struct mm_struct *mm) |
| 88 | { |
| 89 | return PAGE_SIZE * mm->total_vm; |
| 90 | } |
| 91 | |
Alexey Dobriyan | a2ade7b | 2011-01-12 17:00:32 -0800 | [diff] [blame] | 92 | unsigned long task_statm(struct mm_struct *mm, |
| 93 | unsigned long *shared, unsigned long *text, |
| 94 | unsigned long *data, unsigned long *resident) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | { |
Jerome Marchand | eca56ff | 2016-01-14 15:19:26 -0800 | [diff] [blame] | 96 | *shared = get_mm_counter(mm, MM_FILEPAGES) + |
| 97 | get_mm_counter(mm, MM_SHMEMPAGES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) |
| 99 | >> PAGE_SHIFT; |
Konstantin Khlebnikov | 8463833 | 2016-01-14 15:22:07 -0800 | [diff] [blame] | 100 | *data = mm->data_vm + mm->stack_vm; |
KAMEZAWA Hiroyuki | d559db0 | 2010-03-05 13:41:39 -0800 | [diff] [blame] | 101 | *resident = *shared + get_mm_counter(mm, MM_ANONPAGES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | return mm->total_vm; |
| 103 | } |
| 104 | |
KAMEZAWA Hiroyuki | 9e78144 | 2012-10-19 17:00:55 +0900 | [diff] [blame] | 105 | #ifdef CONFIG_NUMA |
| 106 | /* |
Oleg Nesterov | 498f237 | 2014-10-09 15:27:52 -0700 | [diff] [blame] | 107 | * Save get_task_policy() for show_numa_map(). |
KAMEZAWA Hiroyuki | 9e78144 | 2012-10-19 17:00:55 +0900 | [diff] [blame] | 108 | */ |
| 109 | static void hold_task_mempolicy(struct proc_maps_private *priv) |
| 110 | { |
| 111 | struct task_struct *task = priv->task; |
| 112 | |
| 113 | task_lock(task); |
Oleg Nesterov | 498f237 | 2014-10-09 15:27:52 -0700 | [diff] [blame] | 114 | priv->task_mempolicy = get_task_policy(task); |
KAMEZAWA Hiroyuki | 9e78144 | 2012-10-19 17:00:55 +0900 | [diff] [blame] | 115 | mpol_get(priv->task_mempolicy); |
| 116 | task_unlock(task); |
| 117 | } |
| 118 | static void release_task_mempolicy(struct proc_maps_private *priv) |
| 119 | { |
| 120 | mpol_put(priv->task_mempolicy); |
| 121 | } |
| 122 | #else |
| 123 | static void hold_task_mempolicy(struct proc_maps_private *priv) |
| 124 | { |
| 125 | } |
| 126 | static void release_task_mempolicy(struct proc_maps_private *priv) |
| 127 | { |
| 128 | } |
| 129 | #endif |
| 130 | |
Colin Cross | 3e4578f | 2015-10-27 16:42:08 -0700 | [diff] [blame] | 131 | static void seq_print_vma_name(struct seq_file *m, struct vm_area_struct *vma) |
| 132 | { |
| 133 | const char __user *name = vma_get_anon_name(vma); |
| 134 | struct mm_struct *mm = vma->vm_mm; |
| 135 | |
| 136 | unsigned long page_start_vaddr; |
| 137 | unsigned long page_offset; |
| 138 | unsigned long num_pages; |
| 139 | unsigned long max_len = NAME_MAX; |
| 140 | int i; |
| 141 | |
| 142 | page_start_vaddr = (unsigned long)name & PAGE_MASK; |
| 143 | page_offset = (unsigned long)name - page_start_vaddr; |
| 144 | num_pages = DIV_ROUND_UP(page_offset + max_len, PAGE_SIZE); |
| 145 | |
| 146 | seq_puts(m, "[anon:"); |
| 147 | |
| 148 | for (i = 0; i < num_pages; i++) { |
| 149 | int len; |
| 150 | int write_len; |
| 151 | const char *kaddr; |
| 152 | long pages_pinned; |
| 153 | struct page *page; |
| 154 | |
| 155 | pages_pinned = get_user_pages_remote(current, mm, |
| 156 | page_start_vaddr, 1, 0, &page, NULL); |
| 157 | if (pages_pinned < 1) { |
| 158 | seq_puts(m, "<fault>]"); |
| 159 | return; |
| 160 | } |
| 161 | |
| 162 | kaddr = (const char *)kmap(page); |
| 163 | len = min(max_len, PAGE_SIZE - page_offset); |
| 164 | write_len = strnlen(kaddr + page_offset, len); |
| 165 | seq_write(m, kaddr + page_offset, write_len); |
| 166 | kunmap(page); |
| 167 | put_page(page); |
| 168 | |
| 169 | /* if strnlen hit a null terminator then we're done */ |
| 170 | if (write_len != len) |
| 171 | break; |
| 172 | |
| 173 | max_len -= len; |
| 174 | page_offset = 0; |
| 175 | page_start_vaddr += PAGE_SIZE; |
| 176 | } |
| 177 | |
| 178 | seq_putc(m, ']'); |
| 179 | } |
| 180 | |
Oleg Nesterov | 59b4bf1 | 2014-10-09 15:25:28 -0700 | [diff] [blame] | 181 | static void vma_stop(struct proc_maps_private *priv) |
Mauricio Lin | e070ad4 | 2005-09-03 15:55:10 -0700 | [diff] [blame] | 182 | { |
Oleg Nesterov | 59b4bf1 | 2014-10-09 15:25:28 -0700 | [diff] [blame] | 183 | struct mm_struct *mm = priv->mm; |
| 184 | |
| 185 | release_task_mempolicy(priv); |
| 186 | up_read(&mm->mmap_sem); |
| 187 | mmput(mm); |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 188 | } |
| 189 | |
Oleg Nesterov | ad2a00e | 2014-10-09 15:25:39 -0700 | [diff] [blame] | 190 | static struct vm_area_struct * |
| 191 | m_next_vma(struct proc_maps_private *priv, struct vm_area_struct *vma) |
| 192 | { |
| 193 | if (vma == priv->tail_vma) |
| 194 | return NULL; |
| 195 | return vma->vm_next ?: priv->tail_vma; |
| 196 | } |
| 197 | |
Oleg Nesterov | b8c20a9 | 2014-10-09 15:25:41 -0700 | [diff] [blame] | 198 | static void m_cache_vma(struct seq_file *m, struct vm_area_struct *vma) |
| 199 | { |
| 200 | if (m->count < m->size) /* vma is copied successfully */ |
Robert Ho | 855af07 | 2016-10-07 17:02:36 -0700 | [diff] [blame] | 201 | m->version = m_next_vma(m->private, vma) ? vma->vm_end : -1UL; |
Oleg Nesterov | b8c20a9 | 2014-10-09 15:25:41 -0700 | [diff] [blame] | 202 | } |
| 203 | |
Oleg Nesterov | 0c25532 | 2014-10-09 15:25:36 -0700 | [diff] [blame] | 204 | static void *m_start(struct seq_file *m, loff_t *ppos) |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 205 | { |
| 206 | struct proc_maps_private *priv = m->private; |
Oleg Nesterov | b8c20a9 | 2014-10-09 15:25:41 -0700 | [diff] [blame] | 207 | unsigned long last_addr = m->version; |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 208 | struct mm_struct *mm; |
Oleg Nesterov | 0c25532 | 2014-10-09 15:25:36 -0700 | [diff] [blame] | 209 | struct vm_area_struct *vma; |
| 210 | unsigned int pos = *ppos; |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 211 | |
Oleg Nesterov | b8c20a9 | 2014-10-09 15:25:41 -0700 | [diff] [blame] | 212 | /* See m_cache_vma(). Zero at the start or after lseek. */ |
| 213 | if (last_addr == -1UL) |
| 214 | return NULL; |
| 215 | |
Oleg Nesterov | 2c03376 | 2014-10-09 15:25:51 -0700 | [diff] [blame] | 216 | priv->task = get_proc_task(priv->inode); |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 217 | if (!priv->task) |
Al Viro | ec6fd8a | 2011-02-15 22:22:54 -0500 | [diff] [blame] | 218 | return ERR_PTR(-ESRCH); |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 219 | |
Oleg Nesterov | 29a40ac | 2014-10-09 15:25:26 -0700 | [diff] [blame] | 220 | mm = priv->mm; |
| 221 | if (!mm || !atomic_inc_not_zero(&mm->mm_users)) |
| 222 | return NULL; |
Oleg Nesterov | 0c25532 | 2014-10-09 15:25:36 -0700 | [diff] [blame] | 223 | |
Oleg Nesterov | 00f89d2 | 2009-07-10 03:27:38 +0200 | [diff] [blame] | 224 | down_read(&mm->mmap_sem); |
KAMEZAWA Hiroyuki | 9e78144 | 2012-10-19 17:00:55 +0900 | [diff] [blame] | 225 | hold_task_mempolicy(priv); |
Oleg Nesterov | 0c25532 | 2014-10-09 15:25:36 -0700 | [diff] [blame] | 226 | priv->tail_vma = get_gate_vma(mm); |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 227 | |
Oleg Nesterov | b8c20a9 | 2014-10-09 15:25:41 -0700 | [diff] [blame] | 228 | if (last_addr) { |
Robert Ho | 855af07 | 2016-10-07 17:02:36 -0700 | [diff] [blame] | 229 | vma = find_vma(mm, last_addr - 1); |
| 230 | if (vma && vma->vm_start <= last_addr) |
| 231 | vma = m_next_vma(priv, vma); |
| 232 | if (vma) |
Oleg Nesterov | b8c20a9 | 2014-10-09 15:25:41 -0700 | [diff] [blame] | 233 | return vma; |
| 234 | } |
| 235 | |
| 236 | m->version = 0; |
Oleg Nesterov | 0c25532 | 2014-10-09 15:25:36 -0700 | [diff] [blame] | 237 | if (pos < mm->map_count) { |
Oleg Nesterov | 557c2d8 | 2014-10-09 15:25:43 -0700 | [diff] [blame] | 238 | for (vma = mm->mmap; pos; pos--) { |
| 239 | m->version = vma->vm_start; |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 240 | vma = vma->vm_next; |
Oleg Nesterov | 557c2d8 | 2014-10-09 15:25:43 -0700 | [diff] [blame] | 241 | } |
Oleg Nesterov | 0c25532 | 2014-10-09 15:25:36 -0700 | [diff] [blame] | 242 | return vma; |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 243 | } |
| 244 | |
Oleg Nesterov | 557c2d8 | 2014-10-09 15:25:43 -0700 | [diff] [blame] | 245 | /* we do not bother to update m->version in this case */ |
Oleg Nesterov | 0c25532 | 2014-10-09 15:25:36 -0700 | [diff] [blame] | 246 | if (pos == mm->map_count && priv->tail_vma) |
| 247 | return priv->tail_vma; |
Oleg Nesterov | 59b4bf1 | 2014-10-09 15:25:28 -0700 | [diff] [blame] | 248 | |
| 249 | vma_stop(priv); |
| 250 | return NULL; |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 251 | } |
| 252 | |
| 253 | static void *m_next(struct seq_file *m, void *v, loff_t *pos) |
| 254 | { |
| 255 | struct proc_maps_private *priv = m->private; |
Oleg Nesterov | ad2a00e | 2014-10-09 15:25:39 -0700 | [diff] [blame] | 256 | struct vm_area_struct *next; |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 257 | |
| 258 | (*pos)++; |
Oleg Nesterov | ad2a00e | 2014-10-09 15:25:39 -0700 | [diff] [blame] | 259 | next = m_next_vma(priv, v); |
Oleg Nesterov | 59b4bf1 | 2014-10-09 15:25:28 -0700 | [diff] [blame] | 260 | if (!next) |
| 261 | vma_stop(priv); |
| 262 | return next; |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 263 | } |
| 264 | |
| 265 | static void m_stop(struct seq_file *m, void *v) |
| 266 | { |
| 267 | struct proc_maps_private *priv = m->private; |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 268 | |
Oleg Nesterov | 59b4bf1 | 2014-10-09 15:25:28 -0700 | [diff] [blame] | 269 | if (!IS_ERR_OR_NULL(v)) |
| 270 | vma_stop(priv); |
Oleg Nesterov | 0d5f5f4 | 2014-10-09 15:25:32 -0700 | [diff] [blame] | 271 | if (priv->task) { |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 272 | put_task_struct(priv->task); |
Oleg Nesterov | 0d5f5f4 | 2014-10-09 15:25:32 -0700 | [diff] [blame] | 273 | priv->task = NULL; |
| 274 | } |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 275 | } |
| 276 | |
Oleg Nesterov | 4db7d0e | 2014-10-09 15:25:21 -0700 | [diff] [blame] | 277 | static int proc_maps_open(struct inode *inode, struct file *file, |
| 278 | const struct seq_operations *ops, int psize) |
| 279 | { |
| 280 | struct proc_maps_private *priv = __seq_open_private(file, ops, psize); |
| 281 | |
| 282 | if (!priv) |
| 283 | return -ENOMEM; |
| 284 | |
Oleg Nesterov | 2c03376 | 2014-10-09 15:25:51 -0700 | [diff] [blame] | 285 | priv->inode = inode; |
Oleg Nesterov | 29a40ac | 2014-10-09 15:25:26 -0700 | [diff] [blame] | 286 | priv->mm = proc_mem_open(inode, PTRACE_MODE_READ); |
| 287 | if (IS_ERR(priv->mm)) { |
| 288 | int err = PTR_ERR(priv->mm); |
| 289 | |
| 290 | seq_release_private(inode, file); |
| 291 | return err; |
| 292 | } |
| 293 | |
Oleg Nesterov | 4db7d0e | 2014-10-09 15:25:21 -0700 | [diff] [blame] | 294 | return 0; |
| 295 | } |
| 296 | |
Oleg Nesterov | 29a40ac | 2014-10-09 15:25:26 -0700 | [diff] [blame] | 297 | static int proc_map_release(struct inode *inode, struct file *file) |
| 298 | { |
| 299 | struct seq_file *seq = file->private_data; |
| 300 | struct proc_maps_private *priv = seq->private; |
| 301 | |
| 302 | if (priv->mm) |
| 303 | mmdrop(priv->mm); |
| 304 | |
| 305 | return seq_release_private(inode, file); |
| 306 | } |
| 307 | |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 308 | static int do_maps_open(struct inode *inode, struct file *file, |
Jan Engelhardt | 03a4482 | 2008-02-08 04:21:19 -0800 | [diff] [blame] | 309 | const struct seq_operations *ops) |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 310 | { |
Oleg Nesterov | 4db7d0e | 2014-10-09 15:25:21 -0700 | [diff] [blame] | 311 | return proc_maps_open(inode, file, ops, |
| 312 | sizeof(struct proc_maps_private)); |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 313 | } |
Mauricio Lin | e070ad4 | 2005-09-03 15:55:10 -0700 | [diff] [blame] | 314 | |
Johannes Weiner | 65376df | 2016-02-02 16:57:29 -0800 | [diff] [blame] | 315 | /* |
| 316 | * Indicate if the VMA is a stack for the given task; for |
| 317 | * /proc/PID/maps that is the stack of the main task. |
| 318 | */ |
| 319 | static int is_stack(struct proc_maps_private *priv, |
Andy Lutomirski | b18cb64 | 2016-09-30 10:58:57 -0700 | [diff] [blame] | 320 | struct vm_area_struct *vma) |
Oleg Nesterov | 58cb654 | 2014-10-09 15:25:54 -0700 | [diff] [blame] | 321 | { |
Andy Lutomirski | b18cb64 | 2016-09-30 10:58:57 -0700 | [diff] [blame] | 322 | /* |
| 323 | * We make no effort to guess what a given thread considers to be |
| 324 | * its "stack". It's not even well-defined for programs written |
| 325 | * languages like Go. |
| 326 | */ |
| 327 | return vma->vm_start <= vma->vm_mm->start_stack && |
| 328 | vma->vm_end >= vma->vm_mm->start_stack; |
Oleg Nesterov | 58cb654 | 2014-10-09 15:25:54 -0700 | [diff] [blame] | 329 | } |
| 330 | |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 331 | static void |
| 332 | show_map_vma(struct seq_file *m, struct vm_area_struct *vma, int is_pid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | { |
Mauricio Lin | e070ad4 | 2005-09-03 15:55:10 -0700 | [diff] [blame] | 334 | struct mm_struct *mm = vma->vm_mm; |
| 335 | struct file *file = vma->vm_file; |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 336 | struct proc_maps_private *priv = m->private; |
KOSAKI Motohiro | ca16d14 | 2011-05-26 19:16:19 +0900 | [diff] [blame] | 337 | vm_flags_t flags = vma->vm_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | unsigned long ino = 0; |
KAMEZAWA Hiroyuki | 6260a4b | 2009-04-06 19:00:30 -0700 | [diff] [blame] | 339 | unsigned long long pgoff = 0; |
Mikulas Patocka | a09a79f | 2011-05-09 13:01:09 +0200 | [diff] [blame] | 340 | unsigned long start, end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | dev_t dev = 0; |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 342 | const char *name = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | |
| 344 | if (file) { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 345 | struct inode *inode = file_inode(vma->vm_file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | dev = inode->i_sb->s_dev; |
| 347 | ino = inode->i_ino; |
KAMEZAWA Hiroyuki | 6260a4b | 2009-04-06 19:00:30 -0700 | [diff] [blame] | 348 | pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | } |
| 350 | |
Linus Torvalds | d782437 | 2010-08-15 11:35:52 -0700 | [diff] [blame] | 351 | /* We don't show the stack guard page in /proc/maps */ |
| 352 | start = vma->vm_start; |
Mikulas Patocka | a09a79f | 2011-05-09 13:01:09 +0200 | [diff] [blame] | 353 | end = vma->vm_end; |
Linus Torvalds | d782437 | 2010-08-15 11:35:52 -0700 | [diff] [blame] | 354 | |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 355 | seq_setwidth(m, 25 + sizeof(void *) * 6 - 1); |
| 356 | seq_printf(m, "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ", |
Linus Torvalds | d782437 | 2010-08-15 11:35:52 -0700 | [diff] [blame] | 357 | start, |
Mikulas Patocka | a09a79f | 2011-05-09 13:01:09 +0200 | [diff] [blame] | 358 | end, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | flags & VM_READ ? 'r' : '-', |
| 360 | flags & VM_WRITE ? 'w' : '-', |
| 361 | flags & VM_EXEC ? 'x' : '-', |
| 362 | flags & VM_MAYSHARE ? 's' : 'p', |
KAMEZAWA Hiroyuki | 6260a4b | 2009-04-06 19:00:30 -0700 | [diff] [blame] | 363 | pgoff, |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 364 | MAJOR(dev), MINOR(dev), ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | |
| 366 | /* |
| 367 | * Print the dentry name for named mappings, and a |
| 368 | * special [heap] marker for the heap: |
| 369 | */ |
Mauricio Lin | e070ad4 | 2005-09-03 15:55:10 -0700 | [diff] [blame] | 370 | if (file) { |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 371 | seq_pad(m, ' '); |
Miklos Szeredi | 2726d56 | 2015-06-19 10:30:28 +0200 | [diff] [blame] | 372 | seq_file_path(m, file, "\n"); |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 373 | goto done; |
| 374 | } |
| 375 | |
Andy Lutomirski | 78d683e | 2014-05-19 15:58:32 -0700 | [diff] [blame] | 376 | if (vma->vm_ops && vma->vm_ops->name) { |
| 377 | name = vma->vm_ops->name(vma); |
| 378 | if (name) |
| 379 | goto done; |
| 380 | } |
| 381 | |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 382 | name = arch_vma_name(vma); |
| 383 | if (!name) { |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 384 | if (!mm) { |
| 385 | name = "[vdso]"; |
| 386 | goto done; |
| 387 | } |
| 388 | |
| 389 | if (vma->vm_start <= mm->brk && |
| 390 | vma->vm_end >= mm->start_brk) { |
| 391 | name = "[heap]"; |
| 392 | goto done; |
| 393 | } |
| 394 | |
Colin Cross | 3e4578f | 2015-10-27 16:42:08 -0700 | [diff] [blame] | 395 | if (is_stack(priv, vma)) { |
Johannes Weiner | 65376df | 2016-02-02 16:57:29 -0800 | [diff] [blame] | 396 | name = "[stack]"; |
Colin Cross | 3e4578f | 2015-10-27 16:42:08 -0700 | [diff] [blame] | 397 | goto done; |
| 398 | } |
| 399 | |
| 400 | if (vma_get_anon_name(vma)) { |
| 401 | seq_pad(m, ' '); |
| 402 | seq_print_vma_name(m, vma); |
| 403 | } |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 404 | } |
| 405 | |
| 406 | done: |
| 407 | if (name) { |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 408 | seq_pad(m, ' '); |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 409 | seq_puts(m, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | } |
| 411 | seq_putc(m, '\n'); |
Joe Korty | 7c88db0 | 2008-10-16 15:27:09 +0400 | [diff] [blame] | 412 | } |
| 413 | |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 414 | static int show_map(struct seq_file *m, void *v, int is_pid) |
Joe Korty | 7c88db0 | 2008-10-16 15:27:09 +0400 | [diff] [blame] | 415 | { |
Oleg Nesterov | ebb6cdd | 2014-10-09 15:25:34 -0700 | [diff] [blame] | 416 | show_map_vma(m, v, is_pid); |
Oleg Nesterov | b8c20a9 | 2014-10-09 15:25:41 -0700 | [diff] [blame] | 417 | m_cache_vma(m, v); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | return 0; |
| 419 | } |
| 420 | |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 421 | static int show_pid_map(struct seq_file *m, void *v) |
| 422 | { |
| 423 | return show_map(m, v, 1); |
| 424 | } |
| 425 | |
| 426 | static int show_tid_map(struct seq_file *m, void *v) |
| 427 | { |
| 428 | return show_map(m, v, 0); |
| 429 | } |
| 430 | |
Jan Engelhardt | 03a4482 | 2008-02-08 04:21:19 -0800 | [diff] [blame] | 431 | static const struct seq_operations proc_pid_maps_op = { |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 432 | .start = m_start, |
| 433 | .next = m_next, |
| 434 | .stop = m_stop, |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 435 | .show = show_pid_map |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 436 | }; |
| 437 | |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 438 | static const struct seq_operations proc_tid_maps_op = { |
| 439 | .start = m_start, |
| 440 | .next = m_next, |
| 441 | .stop = m_stop, |
| 442 | .show = show_tid_map |
| 443 | }; |
| 444 | |
| 445 | static int pid_maps_open(struct inode *inode, struct file *file) |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 446 | { |
| 447 | return do_maps_open(inode, file, &proc_pid_maps_op); |
| 448 | } |
| 449 | |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 450 | static int tid_maps_open(struct inode *inode, struct file *file) |
| 451 | { |
| 452 | return do_maps_open(inode, file, &proc_tid_maps_op); |
| 453 | } |
| 454 | |
| 455 | const struct file_operations proc_pid_maps_operations = { |
| 456 | .open = pid_maps_open, |
| 457 | .read = seq_read, |
| 458 | .llseek = seq_lseek, |
Oleg Nesterov | 29a40ac | 2014-10-09 15:25:26 -0700 | [diff] [blame] | 459 | .release = proc_map_release, |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 460 | }; |
| 461 | |
| 462 | const struct file_operations proc_tid_maps_operations = { |
| 463 | .open = tid_maps_open, |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 464 | .read = seq_read, |
| 465 | .llseek = seq_lseek, |
Oleg Nesterov | 29a40ac | 2014-10-09 15:25:26 -0700 | [diff] [blame] | 466 | .release = proc_map_release, |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 467 | }; |
| 468 | |
| 469 | /* |
| 470 | * Proportional Set Size(PSS): my share of RSS. |
| 471 | * |
| 472 | * PSS of a process is the count of pages it has in memory, where each |
| 473 | * page is divided by the number of processes sharing it. So if a |
| 474 | * process has 1000 pages all to itself, and 1000 shared with one other |
| 475 | * process, its PSS will be 1500. |
| 476 | * |
| 477 | * To keep (accumulated) division errors low, we adopt a 64bit |
| 478 | * fixed-point pss counter to minimize division errors. So (pss >> |
| 479 | * PSS_SHIFT) would be the real byte count. |
| 480 | * |
| 481 | * A shift of 12 before division means (assuming 4K page size): |
| 482 | * - 1M 3-user-pages add up to 8KB errors; |
| 483 | * - supports mapcount up to 2^24, or 16M; |
| 484 | * - supports PSS up to 2^52 bytes, or 4PB. |
| 485 | */ |
| 486 | #define PSS_SHIFT 12 |
| 487 | |
Matt Mackall | 1e88328 | 2008-02-04 22:29:07 -0800 | [diff] [blame] | 488 | #ifdef CONFIG_PROC_PAGE_MONITOR |
Peter Zijlstra | 214e471 | 2008-04-28 02:12:55 -0700 | [diff] [blame] | 489 | struct mem_size_stats { |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 490 | unsigned long resident; |
| 491 | unsigned long shared_clean; |
| 492 | unsigned long shared_dirty; |
| 493 | unsigned long private_clean; |
| 494 | unsigned long private_dirty; |
| 495 | unsigned long referenced; |
Nikanth Karthikesan | b40d4f8 | 2010-10-27 15:34:10 -0700 | [diff] [blame] | 496 | unsigned long anonymous; |
Dave Hansen | 4031a21 | 2011-03-22 16:33:01 -0700 | [diff] [blame] | 497 | unsigned long anonymous_thp; |
Kirill A. Shutemov | 65c4537 | 2016-07-26 15:26:10 -0700 | [diff] [blame] | 498 | unsigned long shmem_thp; |
Peter Zijlstra | 214e471 | 2008-04-28 02:12:55 -0700 | [diff] [blame] | 499 | unsigned long swap; |
Naoya Horiguchi | 25ee01a | 2015-11-05 18:47:11 -0800 | [diff] [blame] | 500 | unsigned long shared_hugetlb; |
| 501 | unsigned long private_hugetlb; |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 502 | u64 pss; |
Minchan Kim | 8334b96 | 2015-09-08 15:00:24 -0700 | [diff] [blame] | 503 | u64 swap_pss; |
Vlastimil Babka | c261e7d | 2016-01-14 15:19:17 -0800 | [diff] [blame] | 504 | bool check_shmem_swap; |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 505 | }; |
| 506 | |
Kirill A. Shutemov | c164e03 | 2014-12-10 15:44:36 -0800 | [diff] [blame] | 507 | static void smaps_account(struct mem_size_stats *mss, struct page *page, |
Kirill A. Shutemov | afd9883 | 2016-01-15 16:52:13 -0800 | [diff] [blame] | 508 | bool compound, bool young, bool dirty) |
Kirill A. Shutemov | c164e03 | 2014-12-10 15:44:36 -0800 | [diff] [blame] | 509 | { |
Kirill A. Shutemov | f4be615 | 2016-01-20 14:58:12 -0800 | [diff] [blame] | 510 | int i, nr = compound ? 1 << compound_order(page) : 1; |
Kirill A. Shutemov | afd9883 | 2016-01-15 16:52:13 -0800 | [diff] [blame] | 511 | unsigned long size = nr * PAGE_SIZE; |
Dave Hansen | ae11c4d | 2011-03-22 16:32:58 -0700 | [diff] [blame] | 512 | |
Kirill A. Shutemov | c164e03 | 2014-12-10 15:44:36 -0800 | [diff] [blame] | 513 | if (PageAnon(page)) |
| 514 | mss->anonymous += size; |
| 515 | |
| 516 | mss->resident += size; |
| 517 | /* Accumulate the size in pages that have been accessed. */ |
Vladimir Davydov | 33c3fc7 | 2015-09-09 15:35:45 -0700 | [diff] [blame] | 518 | if (young || page_is_young(page) || PageReferenced(page)) |
Kirill A. Shutemov | c164e03 | 2014-12-10 15:44:36 -0800 | [diff] [blame] | 519 | mss->referenced += size; |
Kirill A. Shutemov | c164e03 | 2014-12-10 15:44:36 -0800 | [diff] [blame] | 520 | |
Kirill A. Shutemov | afd9883 | 2016-01-15 16:52:13 -0800 | [diff] [blame] | 521 | /* |
| 522 | * page_count(page) == 1 guarantees the page is mapped exactly once. |
| 523 | * If any subpage of the compound page mapped with PTE it would elevate |
| 524 | * page_count(). |
| 525 | */ |
| 526 | if (page_count(page) == 1) { |
Kirill A. Shutemov | c164e03 | 2014-12-10 15:44:36 -0800 | [diff] [blame] | 527 | if (dirty || PageDirty(page)) |
| 528 | mss->private_dirty += size; |
| 529 | else |
| 530 | mss->private_clean += size; |
| 531 | mss->pss += (u64)size << PSS_SHIFT; |
Kirill A. Shutemov | afd9883 | 2016-01-15 16:52:13 -0800 | [diff] [blame] | 532 | return; |
| 533 | } |
| 534 | |
| 535 | for (i = 0; i < nr; i++, page++) { |
| 536 | int mapcount = page_mapcount(page); |
| 537 | |
| 538 | if (mapcount >= 2) { |
| 539 | if (dirty || PageDirty(page)) |
| 540 | mss->shared_dirty += PAGE_SIZE; |
| 541 | else |
| 542 | mss->shared_clean += PAGE_SIZE; |
| 543 | mss->pss += (PAGE_SIZE << PSS_SHIFT) / mapcount; |
| 544 | } else { |
| 545 | if (dirty || PageDirty(page)) |
| 546 | mss->private_dirty += PAGE_SIZE; |
| 547 | else |
| 548 | mss->private_clean += PAGE_SIZE; |
| 549 | mss->pss += PAGE_SIZE << PSS_SHIFT; |
| 550 | } |
Kirill A. Shutemov | c164e03 | 2014-12-10 15:44:36 -0800 | [diff] [blame] | 551 | } |
| 552 | } |
| 553 | |
Vlastimil Babka | c261e7d | 2016-01-14 15:19:17 -0800 | [diff] [blame] | 554 | #ifdef CONFIG_SHMEM |
Vlastimil Babka | c261e7d | 2016-01-14 15:19:17 -0800 | [diff] [blame] | 555 | static int smaps_pte_hole(unsigned long addr, unsigned long end, |
| 556 | struct mm_walk *walk) |
| 557 | { |
| 558 | struct mem_size_stats *mss = walk->private; |
| 559 | |
Vlastimil Babka | 48131e0 | 2016-01-14 15:19:23 -0800 | [diff] [blame] | 560 | mss->swap += shmem_partial_swap_usage( |
| 561 | walk->vma->vm_file->f_mapping, addr, end); |
Vlastimil Babka | c261e7d | 2016-01-14 15:19:17 -0800 | [diff] [blame] | 562 | |
| 563 | return 0; |
| 564 | } |
Vlastimil Babka | c261e7d | 2016-01-14 15:19:17 -0800 | [diff] [blame] | 565 | #endif |
| 566 | |
Kirill A. Shutemov | c164e03 | 2014-12-10 15:44:36 -0800 | [diff] [blame] | 567 | static void smaps_pte_entry(pte_t *pte, unsigned long addr, |
| 568 | struct mm_walk *walk) |
Dave Hansen | ae11c4d | 2011-03-22 16:32:58 -0700 | [diff] [blame] | 569 | { |
| 570 | struct mem_size_stats *mss = walk->private; |
Naoya Horiguchi | 14eb6fd | 2015-02-11 15:27:43 -0800 | [diff] [blame] | 571 | struct vm_area_struct *vma = walk->vma; |
Konstantin Khlebnikov | b1d4d9e | 2012-05-31 16:26:20 -0700 | [diff] [blame] | 572 | struct page *page = NULL; |
Dave Hansen | ae11c4d | 2011-03-22 16:32:58 -0700 | [diff] [blame] | 573 | |
Kirill A. Shutemov | c164e03 | 2014-12-10 15:44:36 -0800 | [diff] [blame] | 574 | if (pte_present(*pte)) { |
| 575 | page = vm_normal_page(vma, addr, *pte); |
| 576 | } else if (is_swap_pte(*pte)) { |
| 577 | swp_entry_t swpent = pte_to_swp_entry(*pte); |
Konstantin Khlebnikov | b1d4d9e | 2012-05-31 16:26:20 -0700 | [diff] [blame] | 578 | |
Minchan Kim | 8334b96 | 2015-09-08 15:00:24 -0700 | [diff] [blame] | 579 | if (!non_swap_entry(swpent)) { |
| 580 | int mapcount; |
| 581 | |
Kirill A. Shutemov | c164e03 | 2014-12-10 15:44:36 -0800 | [diff] [blame] | 582 | mss->swap += PAGE_SIZE; |
Minchan Kim | 8334b96 | 2015-09-08 15:00:24 -0700 | [diff] [blame] | 583 | mapcount = swp_swapcount(swpent); |
| 584 | if (mapcount >= 2) { |
| 585 | u64 pss_delta = (u64)PAGE_SIZE << PSS_SHIFT; |
| 586 | |
| 587 | do_div(pss_delta, mapcount); |
| 588 | mss->swap_pss += pss_delta; |
| 589 | } else { |
| 590 | mss->swap_pss += (u64)PAGE_SIZE << PSS_SHIFT; |
| 591 | } |
| 592 | } else if (is_migration_entry(swpent)) |
Konstantin Khlebnikov | b1d4d9e | 2012-05-31 16:26:20 -0700 | [diff] [blame] | 593 | page = migration_entry_to_page(swpent); |
Vlastimil Babka | c261e7d | 2016-01-14 15:19:17 -0800 | [diff] [blame] | 594 | } else if (unlikely(IS_ENABLED(CONFIG_SHMEM) && mss->check_shmem_swap |
| 595 | && pte_none(*pte))) { |
Vlastimil Babka | 48131e0 | 2016-01-14 15:19:23 -0800 | [diff] [blame] | 596 | page = find_get_entry(vma->vm_file->f_mapping, |
| 597 | linear_page_index(vma, addr)); |
| 598 | if (!page) |
| 599 | return; |
| 600 | |
| 601 | if (radix_tree_exceptional_entry(page)) |
| 602 | mss->swap += PAGE_SIZE; |
| 603 | else |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 604 | put_page(page); |
Vlastimil Babka | 48131e0 | 2016-01-14 15:19:23 -0800 | [diff] [blame] | 605 | |
| 606 | return; |
Dave Hansen | ae11c4d | 2011-03-22 16:32:58 -0700 | [diff] [blame] | 607 | } |
| 608 | |
Dave Hansen | ae11c4d | 2011-03-22 16:32:58 -0700 | [diff] [blame] | 609 | if (!page) |
| 610 | return; |
Kirill A. Shutemov | afd9883 | 2016-01-15 16:52:13 -0800 | [diff] [blame] | 611 | |
| 612 | smaps_account(mss, page, false, pte_young(*pte), pte_dirty(*pte)); |
Dave Hansen | ae11c4d | 2011-03-22 16:32:58 -0700 | [diff] [blame] | 613 | } |
| 614 | |
Kirill A. Shutemov | c164e03 | 2014-12-10 15:44:36 -0800 | [diff] [blame] | 615 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| 616 | static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr, |
| 617 | struct mm_walk *walk) |
| 618 | { |
| 619 | struct mem_size_stats *mss = walk->private; |
Naoya Horiguchi | 14eb6fd | 2015-02-11 15:27:43 -0800 | [diff] [blame] | 620 | struct vm_area_struct *vma = walk->vma; |
Kirill A. Shutemov | c164e03 | 2014-12-10 15:44:36 -0800 | [diff] [blame] | 621 | struct page *page; |
| 622 | |
| 623 | /* FOLL_DUMP will return -EFAULT on huge zero page */ |
| 624 | page = follow_trans_huge_pmd(vma, addr, pmd, FOLL_DUMP); |
| 625 | if (IS_ERR_OR_NULL(page)) |
| 626 | return; |
Kirill A. Shutemov | 65c4537 | 2016-07-26 15:26:10 -0700 | [diff] [blame] | 627 | if (PageAnon(page)) |
| 628 | mss->anonymous_thp += HPAGE_PMD_SIZE; |
| 629 | else if (PageSwapBacked(page)) |
| 630 | mss->shmem_thp += HPAGE_PMD_SIZE; |
Dan Williams | ca120cf | 2016-09-03 10:38:03 -0700 | [diff] [blame] | 631 | else if (is_zone_device_page(page)) |
| 632 | /* pass */; |
Kirill A. Shutemov | 65c4537 | 2016-07-26 15:26:10 -0700 | [diff] [blame] | 633 | else |
| 634 | VM_BUG_ON_PAGE(1, page); |
Kirill A. Shutemov | afd9883 | 2016-01-15 16:52:13 -0800 | [diff] [blame] | 635 | smaps_account(mss, page, true, pmd_young(*pmd), pmd_dirty(*pmd)); |
Kirill A. Shutemov | c164e03 | 2014-12-10 15:44:36 -0800 | [diff] [blame] | 636 | } |
| 637 | #else |
| 638 | static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr, |
| 639 | struct mm_walk *walk) |
| 640 | { |
| 641 | } |
| 642 | #endif |
| 643 | |
Matt Mackall | b3ae5ac | 2008-02-04 22:29:01 -0800 | [diff] [blame] | 644 | static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, |
Dave Hansen | 2165009 | 2008-06-12 15:21:47 -0700 | [diff] [blame] | 645 | struct mm_walk *walk) |
Mauricio Lin | e070ad4 | 2005-09-03 15:55:10 -0700 | [diff] [blame] | 646 | { |
Naoya Horiguchi | 14eb6fd | 2015-02-11 15:27:43 -0800 | [diff] [blame] | 647 | struct vm_area_struct *vma = walk->vma; |
Dave Hansen | ae11c4d | 2011-03-22 16:32:58 -0700 | [diff] [blame] | 648 | pte_t *pte; |
Hugh Dickins | 705e87c | 2005-10-29 18:16:27 -0700 | [diff] [blame] | 649 | spinlock_t *ptl; |
Mauricio Lin | e070ad4 | 2005-09-03 15:55:10 -0700 | [diff] [blame] | 650 | |
Kirill A. Shutemov | b6ec57f | 2016-01-21 16:40:25 -0800 | [diff] [blame] | 651 | ptl = pmd_trans_huge_lock(pmd, vma); |
| 652 | if (ptl) { |
Kirill A. Shutemov | c164e03 | 2014-12-10 15:44:36 -0800 | [diff] [blame] | 653 | smaps_pmd_entry(pmd, addr, walk); |
Kirill A. Shutemov | bf92915 | 2013-11-14 14:30:54 -0800 | [diff] [blame] | 654 | spin_unlock(ptl); |
Naoya Horiguchi | 025c5b2 | 2012-03-21 16:33:57 -0700 | [diff] [blame] | 655 | return 0; |
Dave Hansen | 22e057c | 2011-03-22 16:33:00 -0700 | [diff] [blame] | 656 | } |
Andrea Arcangeli | 1a5a990 | 2012-03-21 16:33:42 -0700 | [diff] [blame] | 657 | |
| 658 | if (pmd_trans_unstable(pmd)) |
| 659 | return 0; |
Dave Hansen | 22e057c | 2011-03-22 16:33:00 -0700 | [diff] [blame] | 660 | /* |
| 661 | * The mmap_sem held all the way back in m_start() is what |
| 662 | * keeps khugepaged out of here and from collapsing things |
| 663 | * in here. |
| 664 | */ |
Hugh Dickins | 705e87c | 2005-10-29 18:16:27 -0700 | [diff] [blame] | 665 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
Dave Hansen | ae11c4d | 2011-03-22 16:32:58 -0700 | [diff] [blame] | 666 | for (; addr != end; pte++, addr += PAGE_SIZE) |
Kirill A. Shutemov | c164e03 | 2014-12-10 15:44:36 -0800 | [diff] [blame] | 667 | smaps_pte_entry(pte, addr, walk); |
Hugh Dickins | 705e87c | 2005-10-29 18:16:27 -0700 | [diff] [blame] | 668 | pte_unmap_unlock(pte - 1, ptl); |
| 669 | cond_resched(); |
Matt Mackall | b3ae5ac | 2008-02-04 22:29:01 -0800 | [diff] [blame] | 670 | return 0; |
Mauricio Lin | e070ad4 | 2005-09-03 15:55:10 -0700 | [diff] [blame] | 671 | } |
| 672 | |
Cyrill Gorcunov | 834f82e | 2012-12-17 16:03:13 -0800 | [diff] [blame] | 673 | static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma) |
| 674 | { |
| 675 | /* |
| 676 | * Don't forget to update Documentation/ on changes. |
| 677 | */ |
| 678 | static const char mnemonics[BITS_PER_LONG][2] = { |
| 679 | /* |
| 680 | * In case if we meet a flag we don't know about. |
| 681 | */ |
| 682 | [0 ... (BITS_PER_LONG-1)] = "??", |
| 683 | |
| 684 | [ilog2(VM_READ)] = "rd", |
| 685 | [ilog2(VM_WRITE)] = "wr", |
| 686 | [ilog2(VM_EXEC)] = "ex", |
| 687 | [ilog2(VM_SHARED)] = "sh", |
| 688 | [ilog2(VM_MAYREAD)] = "mr", |
| 689 | [ilog2(VM_MAYWRITE)] = "mw", |
| 690 | [ilog2(VM_MAYEXEC)] = "me", |
| 691 | [ilog2(VM_MAYSHARE)] = "ms", |
| 692 | [ilog2(VM_GROWSDOWN)] = "gd", |
| 693 | [ilog2(VM_PFNMAP)] = "pf", |
| 694 | [ilog2(VM_DENYWRITE)] = "dw", |
Qiaowei Ren | 4aae7e4 | 2014-11-14 07:18:25 -0800 | [diff] [blame] | 695 | #ifdef CONFIG_X86_INTEL_MPX |
| 696 | [ilog2(VM_MPX)] = "mp", |
| 697 | #endif |
Cyrill Gorcunov | 834f82e | 2012-12-17 16:03:13 -0800 | [diff] [blame] | 698 | [ilog2(VM_LOCKED)] = "lo", |
| 699 | [ilog2(VM_IO)] = "io", |
| 700 | [ilog2(VM_SEQ_READ)] = "sr", |
| 701 | [ilog2(VM_RAND_READ)] = "rr", |
| 702 | [ilog2(VM_DONTCOPY)] = "dc", |
| 703 | [ilog2(VM_DONTEXPAND)] = "de", |
| 704 | [ilog2(VM_ACCOUNT)] = "ac", |
| 705 | [ilog2(VM_NORESERVE)] = "nr", |
| 706 | [ilog2(VM_HUGETLB)] = "ht", |
Cyrill Gorcunov | 834f82e | 2012-12-17 16:03:13 -0800 | [diff] [blame] | 707 | [ilog2(VM_ARCH_1)] = "ar", |
| 708 | [ilog2(VM_DONTDUMP)] = "dd", |
Naoya Horiguchi | ec8e41a | 2013-11-12 15:07:49 -0800 | [diff] [blame] | 709 | #ifdef CONFIG_MEM_SOFT_DIRTY |
| 710 | [ilog2(VM_SOFTDIRTY)] = "sd", |
| 711 | #endif |
Cyrill Gorcunov | 834f82e | 2012-12-17 16:03:13 -0800 | [diff] [blame] | 712 | [ilog2(VM_MIXEDMAP)] = "mm", |
| 713 | [ilog2(VM_HUGEPAGE)] = "hg", |
| 714 | [ilog2(VM_NOHUGEPAGE)] = "nh", |
| 715 | [ilog2(VM_MERGEABLE)] = "mg", |
Andrea Arcangeli | 16ba6f8 | 2015-09-04 15:46:17 -0700 | [diff] [blame] | 716 | [ilog2(VM_UFFD_MISSING)]= "um", |
| 717 | [ilog2(VM_UFFD_WP)] = "uw", |
Dave Hansen | c1192f8 | 2016-02-12 13:02:27 -0800 | [diff] [blame] | 718 | #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS |
| 719 | /* These come out via ProtectionKey: */ |
| 720 | [ilog2(VM_PKEY_BIT0)] = "", |
| 721 | [ilog2(VM_PKEY_BIT1)] = "", |
| 722 | [ilog2(VM_PKEY_BIT2)] = "", |
| 723 | [ilog2(VM_PKEY_BIT3)] = "", |
| 724 | #endif |
Cyrill Gorcunov | 834f82e | 2012-12-17 16:03:13 -0800 | [diff] [blame] | 725 | }; |
| 726 | size_t i; |
| 727 | |
| 728 | seq_puts(m, "VmFlags: "); |
| 729 | for (i = 0; i < BITS_PER_LONG; i++) { |
Dave Hansen | c1192f8 | 2016-02-12 13:02:27 -0800 | [diff] [blame] | 730 | if (!mnemonics[i][0]) |
| 731 | continue; |
Cyrill Gorcunov | 834f82e | 2012-12-17 16:03:13 -0800 | [diff] [blame] | 732 | if (vma->vm_flags & (1UL << i)) { |
| 733 | seq_printf(m, "%c%c ", |
| 734 | mnemonics[i][0], mnemonics[i][1]); |
| 735 | } |
| 736 | } |
| 737 | seq_putc(m, '\n'); |
| 738 | } |
| 739 | |
Naoya Horiguchi | 25ee01a | 2015-11-05 18:47:11 -0800 | [diff] [blame] | 740 | #ifdef CONFIG_HUGETLB_PAGE |
| 741 | static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask, |
| 742 | unsigned long addr, unsigned long end, |
| 743 | struct mm_walk *walk) |
| 744 | { |
| 745 | struct mem_size_stats *mss = walk->private; |
| 746 | struct vm_area_struct *vma = walk->vma; |
| 747 | struct page *page = NULL; |
| 748 | |
| 749 | if (pte_present(*pte)) { |
| 750 | page = vm_normal_page(vma, addr, *pte); |
| 751 | } else if (is_swap_pte(*pte)) { |
| 752 | swp_entry_t swpent = pte_to_swp_entry(*pte); |
| 753 | |
| 754 | if (is_migration_entry(swpent)) |
| 755 | page = migration_entry_to_page(swpent); |
| 756 | } |
| 757 | if (page) { |
| 758 | int mapcount = page_mapcount(page); |
| 759 | |
| 760 | if (mapcount >= 2) |
| 761 | mss->shared_hugetlb += huge_page_size(hstate_vma(vma)); |
| 762 | else |
| 763 | mss->private_hugetlb += huge_page_size(hstate_vma(vma)); |
| 764 | } |
| 765 | return 0; |
| 766 | } |
| 767 | #endif /* HUGETLB_PAGE */ |
| 768 | |
Dave Hansen | c1192f8 | 2016-02-12 13:02:27 -0800 | [diff] [blame] | 769 | void __weak arch_show_smap(struct seq_file *m, struct vm_area_struct *vma) |
| 770 | { |
| 771 | } |
| 772 | |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 773 | static int show_smap(struct seq_file *m, void *v, int is_pid) |
Mauricio Lin | e070ad4 | 2005-09-03 15:55:10 -0700 | [diff] [blame] | 774 | { |
| 775 | struct vm_area_struct *vma = v; |
Mauricio Lin | e070ad4 | 2005-09-03 15:55:10 -0700 | [diff] [blame] | 776 | struct mem_size_stats mss; |
Dave Hansen | 2165009 | 2008-06-12 15:21:47 -0700 | [diff] [blame] | 777 | struct mm_walk smaps_walk = { |
| 778 | .pmd_entry = smaps_pte_range, |
Naoya Horiguchi | 25ee01a | 2015-11-05 18:47:11 -0800 | [diff] [blame] | 779 | #ifdef CONFIG_HUGETLB_PAGE |
| 780 | .hugetlb_entry = smaps_hugetlb_range, |
| 781 | #endif |
Dave Hansen | 2165009 | 2008-06-12 15:21:47 -0700 | [diff] [blame] | 782 | .mm = vma->vm_mm, |
| 783 | .private = &mss, |
| 784 | }; |
Mauricio Lin | e070ad4 | 2005-09-03 15:55:10 -0700 | [diff] [blame] | 785 | |
| 786 | memset(&mss, 0, sizeof mss); |
Vlastimil Babka | c261e7d | 2016-01-14 15:19:17 -0800 | [diff] [blame] | 787 | |
| 788 | #ifdef CONFIG_SHMEM |
| 789 | if (vma->vm_file && shmem_mapping(vma->vm_file->f_mapping)) { |
Vlastimil Babka | 6a15a37 | 2016-01-14 15:19:20 -0800 | [diff] [blame] | 790 | /* |
| 791 | * For shared or readonly shmem mappings we know that all |
| 792 | * swapped out pages belong to the shmem object, and we can |
| 793 | * obtain the swap value much more efficiently. For private |
| 794 | * writable mappings, we might have COW pages that are |
| 795 | * not affected by the parent swapped out pages of the shmem |
| 796 | * object, so we have to distinguish them during the page walk. |
| 797 | * Unless we know that the shmem object (or the part mapped by |
| 798 | * our VMA) has no swapped out pages at all. |
| 799 | */ |
| 800 | unsigned long shmem_swapped = shmem_swap_usage(vma); |
| 801 | |
| 802 | if (!shmem_swapped || (vma->vm_flags & VM_SHARED) || |
| 803 | !(vma->vm_flags & VM_WRITE)) { |
| 804 | mss.swap = shmem_swapped; |
| 805 | } else { |
| 806 | mss.check_shmem_swap = true; |
| 807 | smaps_walk.pte_hole = smaps_pte_hole; |
| 808 | } |
Vlastimil Babka | c261e7d | 2016-01-14 15:19:17 -0800 | [diff] [blame] | 809 | } |
| 810 | #endif |
| 811 | |
KAMEZAWA Hiroyuki | d82ef02 | 2010-04-02 09:11:29 +0900 | [diff] [blame] | 812 | /* mmap_sem is held in m_start */ |
Naoya Horiguchi | 14eb6fd | 2015-02-11 15:27:43 -0800 | [diff] [blame] | 813 | walk_page_vma(vma, &smaps_walk); |
Matt Mackall | 4752c36 | 2008-02-04 22:29:02 -0800 | [diff] [blame] | 814 | |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 815 | show_map_vma(m, vma, is_pid); |
Matt Mackall | 4752c36 | 2008-02-04 22:29:02 -0800 | [diff] [blame] | 816 | |
Colin Cross | 3e4578f | 2015-10-27 16:42:08 -0700 | [diff] [blame] | 817 | if (vma_get_anon_name(vma)) { |
| 818 | seq_puts(m, "Name: "); |
| 819 | seq_print_vma_name(m, vma); |
| 820 | seq_putc(m, '\n'); |
| 821 | } |
| 822 | |
Matt Mackall | 4752c36 | 2008-02-04 22:29:02 -0800 | [diff] [blame] | 823 | seq_printf(m, |
| 824 | "Size: %8lu kB\n" |
| 825 | "Rss: %8lu kB\n" |
| 826 | "Pss: %8lu kB\n" |
| 827 | "Shared_Clean: %8lu kB\n" |
| 828 | "Shared_Dirty: %8lu kB\n" |
| 829 | "Private_Clean: %8lu kB\n" |
| 830 | "Private_Dirty: %8lu kB\n" |
Peter Zijlstra | 214e471 | 2008-04-28 02:12:55 -0700 | [diff] [blame] | 831 | "Referenced: %8lu kB\n" |
Nikanth Karthikesan | b40d4f8 | 2010-10-27 15:34:10 -0700 | [diff] [blame] | 832 | "Anonymous: %8lu kB\n" |
Dave Hansen | 4031a21 | 2011-03-22 16:33:01 -0700 | [diff] [blame] | 833 | "AnonHugePages: %8lu kB\n" |
Kirill A. Shutemov | 65c4537 | 2016-07-26 15:26:10 -0700 | [diff] [blame] | 834 | "ShmemPmdMapped: %8lu kB\n" |
Naoya Horiguchi | 25ee01a | 2015-11-05 18:47:11 -0800 | [diff] [blame] | 835 | "Shared_Hugetlb: %8lu kB\n" |
| 836 | "Private_Hugetlb: %7lu kB\n" |
Mel Gorman | 08fba69 | 2009-01-06 14:38:53 -0800 | [diff] [blame] | 837 | "Swap: %8lu kB\n" |
Minchan Kim | 8334b96 | 2015-09-08 15:00:24 -0700 | [diff] [blame] | 838 | "SwapPss: %8lu kB\n" |
Mel Gorman | 3340289 | 2009-01-06 14:38:54 -0800 | [diff] [blame] | 839 | "KernelPageSize: %8lu kB\n" |
Nikanth Karthikesan | 2d90508 | 2011-01-13 15:45:53 -0800 | [diff] [blame] | 840 | "MMUPageSize: %8lu kB\n" |
| 841 | "Locked: %8lu kB\n", |
Matt Mackall | 4752c36 | 2008-02-04 22:29:02 -0800 | [diff] [blame] | 842 | (vma->vm_end - vma->vm_start) >> 10, |
| 843 | mss.resident >> 10, |
| 844 | (unsigned long)(mss.pss >> (10 + PSS_SHIFT)), |
| 845 | mss.shared_clean >> 10, |
| 846 | mss.shared_dirty >> 10, |
| 847 | mss.private_clean >> 10, |
| 848 | mss.private_dirty >> 10, |
Peter Zijlstra | 214e471 | 2008-04-28 02:12:55 -0700 | [diff] [blame] | 849 | mss.referenced >> 10, |
Nikanth Karthikesan | b40d4f8 | 2010-10-27 15:34:10 -0700 | [diff] [blame] | 850 | mss.anonymous >> 10, |
Dave Hansen | 4031a21 | 2011-03-22 16:33:01 -0700 | [diff] [blame] | 851 | mss.anonymous_thp >> 10, |
Kirill A. Shutemov | 65c4537 | 2016-07-26 15:26:10 -0700 | [diff] [blame] | 852 | mss.shmem_thp >> 10, |
Naoya Horiguchi | 25ee01a | 2015-11-05 18:47:11 -0800 | [diff] [blame] | 853 | mss.shared_hugetlb >> 10, |
| 854 | mss.private_hugetlb >> 10, |
Mel Gorman | 08fba69 | 2009-01-06 14:38:53 -0800 | [diff] [blame] | 855 | mss.swap >> 10, |
Minchan Kim | 8334b96 | 2015-09-08 15:00:24 -0700 | [diff] [blame] | 856 | (unsigned long)(mss.swap_pss >> (10 + PSS_SHIFT)), |
Mel Gorman | 3340289 | 2009-01-06 14:38:54 -0800 | [diff] [blame] | 857 | vma_kernel_pagesize(vma) >> 10, |
Nikanth Karthikesan | 2d90508 | 2011-01-13 15:45:53 -0800 | [diff] [blame] | 858 | vma_mmu_pagesize(vma) >> 10, |
| 859 | (vma->vm_flags & VM_LOCKED) ? |
| 860 | (unsigned long)(mss.pss >> (10 + PSS_SHIFT)) : 0); |
Matt Mackall | 4752c36 | 2008-02-04 22:29:02 -0800 | [diff] [blame] | 861 | |
Dave Hansen | c1192f8 | 2016-02-12 13:02:27 -0800 | [diff] [blame] | 862 | arch_show_smap(m, vma); |
Cyrill Gorcunov | 834f82e | 2012-12-17 16:03:13 -0800 | [diff] [blame] | 863 | show_smap_vma_flags(m, vma); |
Oleg Nesterov | b8c20a9 | 2014-10-09 15:25:41 -0700 | [diff] [blame] | 864 | m_cache_vma(m, vma); |
Joe Korty | 7c88db0 | 2008-10-16 15:27:09 +0400 | [diff] [blame] | 865 | return 0; |
Mauricio Lin | e070ad4 | 2005-09-03 15:55:10 -0700 | [diff] [blame] | 866 | } |
| 867 | |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 868 | static int show_pid_smap(struct seq_file *m, void *v) |
| 869 | { |
| 870 | return show_smap(m, v, 1); |
| 871 | } |
| 872 | |
| 873 | static int show_tid_smap(struct seq_file *m, void *v) |
| 874 | { |
| 875 | return show_smap(m, v, 0); |
| 876 | } |
| 877 | |
Jan Engelhardt | 03a4482 | 2008-02-08 04:21:19 -0800 | [diff] [blame] | 878 | static const struct seq_operations proc_pid_smaps_op = { |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 879 | .start = m_start, |
| 880 | .next = m_next, |
| 881 | .stop = m_stop, |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 882 | .show = show_pid_smap |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 883 | }; |
| 884 | |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 885 | static const struct seq_operations proc_tid_smaps_op = { |
| 886 | .start = m_start, |
| 887 | .next = m_next, |
| 888 | .stop = m_stop, |
| 889 | .show = show_tid_smap |
| 890 | }; |
| 891 | |
| 892 | static int pid_smaps_open(struct inode *inode, struct file *file) |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 893 | { |
| 894 | return do_maps_open(inode, file, &proc_pid_smaps_op); |
| 895 | } |
| 896 | |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 897 | static int tid_smaps_open(struct inode *inode, struct file *file) |
| 898 | { |
| 899 | return do_maps_open(inode, file, &proc_tid_smaps_op); |
| 900 | } |
| 901 | |
| 902 | const struct file_operations proc_pid_smaps_operations = { |
| 903 | .open = pid_smaps_open, |
| 904 | .read = seq_read, |
| 905 | .llseek = seq_lseek, |
Oleg Nesterov | 29a40ac | 2014-10-09 15:25:26 -0700 | [diff] [blame] | 906 | .release = proc_map_release, |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 907 | }; |
| 908 | |
| 909 | const struct file_operations proc_tid_smaps_operations = { |
| 910 | .open = tid_smaps_open, |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 911 | .read = seq_read, |
| 912 | .llseek = seq_lseek, |
Oleg Nesterov | 29a40ac | 2014-10-09 15:25:26 -0700 | [diff] [blame] | 913 | .release = proc_map_release, |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 914 | }; |
| 915 | |
Pavel Emelyanov | 040fa02 | 2013-07-03 15:01:16 -0700 | [diff] [blame] | 916 | enum clear_refs_types { |
| 917 | CLEAR_REFS_ALL = 1, |
| 918 | CLEAR_REFS_ANON, |
| 919 | CLEAR_REFS_MAPPED, |
Pavel Emelyanov | 0f8975e | 2013-07-03 15:01:20 -0700 | [diff] [blame] | 920 | CLEAR_REFS_SOFT_DIRTY, |
Petr Cermak | 695f055 | 2015-02-12 15:01:00 -0800 | [diff] [blame] | 921 | CLEAR_REFS_MM_HIWATER_RSS, |
Pavel Emelyanov | 040fa02 | 2013-07-03 15:01:16 -0700 | [diff] [blame] | 922 | CLEAR_REFS_LAST, |
| 923 | }; |
| 924 | |
Pavel Emelyanov | af9de7e | 2013-07-03 15:01:18 -0700 | [diff] [blame] | 925 | struct clear_refs_private { |
Pavel Emelyanov | 0f8975e | 2013-07-03 15:01:20 -0700 | [diff] [blame] | 926 | enum clear_refs_types type; |
Pavel Emelyanov | af9de7e | 2013-07-03 15:01:18 -0700 | [diff] [blame] | 927 | }; |
| 928 | |
Kirill A. Shutemov | 7d5b3bf | 2015-02-11 15:28:08 -0800 | [diff] [blame] | 929 | #ifdef CONFIG_MEM_SOFT_DIRTY |
Pavel Emelyanov | 0f8975e | 2013-07-03 15:01:20 -0700 | [diff] [blame] | 930 | static inline void clear_soft_dirty(struct vm_area_struct *vma, |
| 931 | unsigned long addr, pte_t *pte) |
| 932 | { |
Pavel Emelyanov | 0f8975e | 2013-07-03 15:01:20 -0700 | [diff] [blame] | 933 | /* |
| 934 | * The soft-dirty tracker uses #PF-s to catch writes |
| 935 | * to pages, so write-protect the pte as well. See the |
| 936 | * Documentation/vm/soft-dirty.txt for full description |
| 937 | * of how soft-dirty works. |
| 938 | */ |
| 939 | pte_t ptent = *pte; |
Cyrill Gorcunov | 179ef71 | 2013-08-13 16:00:49 -0700 | [diff] [blame] | 940 | |
| 941 | if (pte_present(ptent)) { |
Laurent Dufour | 326c259 | 2015-11-05 18:49:21 -0800 | [diff] [blame] | 942 | ptent = ptep_modify_prot_start(vma->vm_mm, addr, pte); |
Cyrill Gorcunov | 179ef71 | 2013-08-13 16:00:49 -0700 | [diff] [blame] | 943 | ptent = pte_wrprotect(ptent); |
Martin Schwidefsky | a7b7617 | 2015-04-22 14:20:47 +0200 | [diff] [blame] | 944 | ptent = pte_clear_soft_dirty(ptent); |
Laurent Dufour | 326c259 | 2015-11-05 18:49:21 -0800 | [diff] [blame] | 945 | ptep_modify_prot_commit(vma->vm_mm, addr, pte, ptent); |
Cyrill Gorcunov | 179ef71 | 2013-08-13 16:00:49 -0700 | [diff] [blame] | 946 | } else if (is_swap_pte(ptent)) { |
| 947 | ptent = pte_swp_clear_soft_dirty(ptent); |
Laurent Dufour | 326c259 | 2015-11-05 18:49:21 -0800 | [diff] [blame] | 948 | set_pte_at(vma->vm_mm, addr, pte, ptent); |
Cyrill Gorcunov | 179ef71 | 2013-08-13 16:00:49 -0700 | [diff] [blame] | 949 | } |
Pavel Emelyanov | 0f8975e | 2013-07-03 15:01:20 -0700 | [diff] [blame] | 950 | } |
Laurent Dufour | 5d3875a | 2015-11-05 18:49:24 -0800 | [diff] [blame] | 951 | #else |
| 952 | static inline void clear_soft_dirty(struct vm_area_struct *vma, |
| 953 | unsigned long addr, pte_t *pte) |
| 954 | { |
| 955 | } |
| 956 | #endif |
Pavel Emelyanov | 0f8975e | 2013-07-03 15:01:20 -0700 | [diff] [blame] | 957 | |
Laurent Dufour | 5d3875a | 2015-11-05 18:49:24 -0800 | [diff] [blame] | 958 | #if defined(CONFIG_MEM_SOFT_DIRTY) && defined(CONFIG_TRANSPARENT_HUGEPAGE) |
Kirill A. Shutemov | 7d5b3bf | 2015-02-11 15:28:08 -0800 | [diff] [blame] | 959 | static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma, |
| 960 | unsigned long addr, pmd_t *pmdp) |
| 961 | { |
Kirill A. Shutemov | 5c9d083 | 2017-04-13 14:56:28 -0700 | [diff] [blame] | 962 | pmd_t pmd = *pmdp; |
| 963 | |
| 964 | /* See comment in change_huge_pmd() */ |
| 965 | pmdp_invalidate(vma, addr, pmdp); |
| 966 | if (pmd_dirty(*pmdp)) |
| 967 | pmd = pmd_mkdirty(pmd); |
| 968 | if (pmd_young(*pmdp)) |
| 969 | pmd = pmd_mkyoung(pmd); |
Kirill A. Shutemov | 7d5b3bf | 2015-02-11 15:28:08 -0800 | [diff] [blame] | 970 | |
| 971 | pmd = pmd_wrprotect(pmd); |
Martin Schwidefsky | a7b7617 | 2015-04-22 14:20:47 +0200 | [diff] [blame] | 972 | pmd = pmd_clear_soft_dirty(pmd); |
Kirill A. Shutemov | 7d5b3bf | 2015-02-11 15:28:08 -0800 | [diff] [blame] | 973 | |
Kirill A. Shutemov | 7d5b3bf | 2015-02-11 15:28:08 -0800 | [diff] [blame] | 974 | set_pmd_at(vma->vm_mm, addr, pmdp, pmd); |
| 975 | } |
Kirill A. Shutemov | 7d5b3bf | 2015-02-11 15:28:08 -0800 | [diff] [blame] | 976 | #else |
Kirill A. Shutemov | 7d5b3bf | 2015-02-11 15:28:08 -0800 | [diff] [blame] | 977 | static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma, |
| 978 | unsigned long addr, pmd_t *pmdp) |
| 979 | { |
| 980 | } |
| 981 | #endif |
| 982 | |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 983 | static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr, |
Dave Hansen | 2165009 | 2008-06-12 15:21:47 -0700 | [diff] [blame] | 984 | unsigned long end, struct mm_walk *walk) |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 985 | { |
Pavel Emelyanov | af9de7e | 2013-07-03 15:01:18 -0700 | [diff] [blame] | 986 | struct clear_refs_private *cp = walk->private; |
Naoya Horiguchi | 5c64f52 | 2015-02-11 15:27:46 -0800 | [diff] [blame] | 987 | struct vm_area_struct *vma = walk->vma; |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 988 | pte_t *pte, ptent; |
| 989 | spinlock_t *ptl; |
| 990 | struct page *page; |
| 991 | |
Kirill A. Shutemov | b6ec57f | 2016-01-21 16:40:25 -0800 | [diff] [blame] | 992 | ptl = pmd_trans_huge_lock(pmd, vma); |
| 993 | if (ptl) { |
Kirill A. Shutemov | 7d5b3bf | 2015-02-11 15:28:08 -0800 | [diff] [blame] | 994 | if (cp->type == CLEAR_REFS_SOFT_DIRTY) { |
| 995 | clear_soft_dirty_pmd(vma, addr, pmd); |
| 996 | goto out; |
| 997 | } |
| 998 | |
| 999 | page = pmd_page(*pmd); |
| 1000 | |
| 1001 | /* Clear accessed and referenced bits. */ |
| 1002 | pmdp_test_and_clear_young(vma, addr, pmd); |
Vladimir Davydov | 33c3fc7 | 2015-09-09 15:35:45 -0700 | [diff] [blame] | 1003 | test_and_clear_page_young(page); |
Kirill A. Shutemov | 7d5b3bf | 2015-02-11 15:28:08 -0800 | [diff] [blame] | 1004 | ClearPageReferenced(page); |
| 1005 | out: |
| 1006 | spin_unlock(ptl); |
| 1007 | return 0; |
| 1008 | } |
| 1009 | |
Andrea Arcangeli | 1a5a990 | 2012-03-21 16:33:42 -0700 | [diff] [blame] | 1010 | if (pmd_trans_unstable(pmd)) |
| 1011 | return 0; |
Dave Hansen | 0331932 | 2011-03-22 16:32:56 -0700 | [diff] [blame] | 1012 | |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 1013 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
| 1014 | for (; addr != end; pte++, addr += PAGE_SIZE) { |
| 1015 | ptent = *pte; |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 1016 | |
Pavel Emelyanov | 0f8975e | 2013-07-03 15:01:20 -0700 | [diff] [blame] | 1017 | if (cp->type == CLEAR_REFS_SOFT_DIRTY) { |
| 1018 | clear_soft_dirty(vma, addr, pte); |
| 1019 | continue; |
| 1020 | } |
| 1021 | |
Cyrill Gorcunov | 179ef71 | 2013-08-13 16:00:49 -0700 | [diff] [blame] | 1022 | if (!pte_present(ptent)) |
| 1023 | continue; |
| 1024 | |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 1025 | page = vm_normal_page(vma, addr, ptent); |
| 1026 | if (!page) |
| 1027 | continue; |
| 1028 | |
| 1029 | /* Clear accessed and referenced bits. */ |
| 1030 | ptep_test_and_clear_young(vma, addr, pte); |
Vladimir Davydov | 33c3fc7 | 2015-09-09 15:35:45 -0700 | [diff] [blame] | 1031 | test_and_clear_page_young(page); |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 1032 | ClearPageReferenced(page); |
| 1033 | } |
| 1034 | pte_unmap_unlock(pte - 1, ptl); |
| 1035 | cond_resched(); |
| 1036 | return 0; |
| 1037 | } |
| 1038 | |
Naoya Horiguchi | 5c64f52 | 2015-02-11 15:27:46 -0800 | [diff] [blame] | 1039 | static int clear_refs_test_walk(unsigned long start, unsigned long end, |
| 1040 | struct mm_walk *walk) |
| 1041 | { |
| 1042 | struct clear_refs_private *cp = walk->private; |
| 1043 | struct vm_area_struct *vma = walk->vma; |
| 1044 | |
Naoya Horiguchi | 48684a6 | 2015-02-11 15:28:06 -0800 | [diff] [blame] | 1045 | if (vma->vm_flags & VM_PFNMAP) |
| 1046 | return 1; |
| 1047 | |
Naoya Horiguchi | 5c64f52 | 2015-02-11 15:27:46 -0800 | [diff] [blame] | 1048 | /* |
| 1049 | * Writing 1 to /proc/pid/clear_refs affects all pages. |
| 1050 | * Writing 2 to /proc/pid/clear_refs only affects anonymous pages. |
| 1051 | * Writing 3 to /proc/pid/clear_refs only affects file mapped pages. |
| 1052 | * Writing 4 to /proc/pid/clear_refs affects all pages. |
| 1053 | */ |
| 1054 | if (cp->type == CLEAR_REFS_ANON && vma->vm_file) |
| 1055 | return 1; |
| 1056 | if (cp->type == CLEAR_REFS_MAPPED && !vma->vm_file) |
| 1057 | return 1; |
| 1058 | return 0; |
| 1059 | } |
| 1060 | |
Matt Mackall | f248dcb | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 1061 | static ssize_t clear_refs_write(struct file *file, const char __user *buf, |
| 1062 | size_t count, loff_t *ppos) |
David Rientjes | b813e93 | 2007-05-06 14:49:24 -0700 | [diff] [blame] | 1063 | { |
Matt Mackall | f248dcb | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 1064 | struct task_struct *task; |
Vincent Li | fb92a4b | 2009-09-22 16:45:36 -0700 | [diff] [blame] | 1065 | char buffer[PROC_NUMBUF]; |
Matt Mackall | f248dcb | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 1066 | struct mm_struct *mm; |
David Rientjes | b813e93 | 2007-05-06 14:49:24 -0700 | [diff] [blame] | 1067 | struct vm_area_struct *vma; |
Pavel Emelyanov | 040fa02 | 2013-07-03 15:01:16 -0700 | [diff] [blame] | 1068 | enum clear_refs_types type; |
| 1069 | int itype; |
Alexey Dobriyan | 0a8cb8e | 2011-05-26 16:25:50 -0700 | [diff] [blame] | 1070 | int rv; |
David Rientjes | b813e93 | 2007-05-06 14:49:24 -0700 | [diff] [blame] | 1071 | |
Matt Mackall | f248dcb | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 1072 | memset(buffer, 0, sizeof(buffer)); |
| 1073 | if (count > sizeof(buffer) - 1) |
| 1074 | count = sizeof(buffer) - 1; |
| 1075 | if (copy_from_user(buffer, buf, count)) |
| 1076 | return -EFAULT; |
Pavel Emelyanov | 040fa02 | 2013-07-03 15:01:16 -0700 | [diff] [blame] | 1077 | rv = kstrtoint(strstrip(buffer), 10, &itype); |
Alexey Dobriyan | 0a8cb8e | 2011-05-26 16:25:50 -0700 | [diff] [blame] | 1078 | if (rv < 0) |
| 1079 | return rv; |
Pavel Emelyanov | 040fa02 | 2013-07-03 15:01:16 -0700 | [diff] [blame] | 1080 | type = (enum clear_refs_types)itype; |
| 1081 | if (type < CLEAR_REFS_ALL || type >= CLEAR_REFS_LAST) |
Matt Mackall | f248dcb | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 1082 | return -EINVAL; |
Pavel Emelyanov | 541c237 | 2013-07-03 15:01:22 -0700 | [diff] [blame] | 1083 | |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1084 | task = get_proc_task(file_inode(file)); |
Matt Mackall | f248dcb | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 1085 | if (!task) |
| 1086 | return -ESRCH; |
| 1087 | mm = get_task_mm(task); |
| 1088 | if (mm) { |
Pavel Emelyanov | af9de7e | 2013-07-03 15:01:18 -0700 | [diff] [blame] | 1089 | struct clear_refs_private cp = { |
Pavel Emelyanov | 0f8975e | 2013-07-03 15:01:20 -0700 | [diff] [blame] | 1090 | .type = type, |
Pavel Emelyanov | af9de7e | 2013-07-03 15:01:18 -0700 | [diff] [blame] | 1091 | }; |
Andrew Morton | 20cbc97 | 2008-07-05 12:29:05 -0700 | [diff] [blame] | 1092 | struct mm_walk clear_refs_walk = { |
| 1093 | .pmd_entry = clear_refs_pte_range, |
Naoya Horiguchi | 5c64f52 | 2015-02-11 15:27:46 -0800 | [diff] [blame] | 1094 | .test_walk = clear_refs_test_walk, |
Andrew Morton | 20cbc97 | 2008-07-05 12:29:05 -0700 | [diff] [blame] | 1095 | .mm = mm, |
Pavel Emelyanov | af9de7e | 2013-07-03 15:01:18 -0700 | [diff] [blame] | 1096 | .private = &cp, |
Andrew Morton | 20cbc97 | 2008-07-05 12:29:05 -0700 | [diff] [blame] | 1097 | }; |
Petr Cermak | 695f055 | 2015-02-12 15:01:00 -0800 | [diff] [blame] | 1098 | |
| 1099 | if (type == CLEAR_REFS_MM_HIWATER_RSS) { |
Michal Hocko | 4e80153 | 2016-05-23 16:25:45 -0700 | [diff] [blame] | 1100 | if (down_write_killable(&mm->mmap_sem)) { |
| 1101 | count = -EINTR; |
| 1102 | goto out_mm; |
| 1103 | } |
| 1104 | |
Petr Cermak | 695f055 | 2015-02-12 15:01:00 -0800 | [diff] [blame] | 1105 | /* |
| 1106 | * Writing 5 to /proc/pid/clear_refs resets the peak |
| 1107 | * resident set size to this mm's current rss value. |
| 1108 | */ |
Petr Cermak | 695f055 | 2015-02-12 15:01:00 -0800 | [diff] [blame] | 1109 | reset_mm_hiwater_rss(mm); |
| 1110 | up_write(&mm->mmap_sem); |
| 1111 | goto out_mm; |
| 1112 | } |
| 1113 | |
Matt Mackall | f248dcb | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 1114 | down_read(&mm->mmap_sem); |
Peter Feiner | 64e4550 | 2014-10-13 15:55:46 -0700 | [diff] [blame] | 1115 | if (type == CLEAR_REFS_SOFT_DIRTY) { |
| 1116 | for (vma = mm->mmap; vma; vma = vma->vm_next) { |
| 1117 | if (!(vma->vm_flags & VM_SOFTDIRTY)) |
| 1118 | continue; |
| 1119 | up_read(&mm->mmap_sem); |
Michal Hocko | 4e80153 | 2016-05-23 16:25:45 -0700 | [diff] [blame] | 1120 | if (down_write_killable(&mm->mmap_sem)) { |
| 1121 | count = -EINTR; |
| 1122 | goto out_mm; |
| 1123 | } |
Peter Feiner | 64e4550 | 2014-10-13 15:55:46 -0700 | [diff] [blame] | 1124 | for (vma = mm->mmap; vma; vma = vma->vm_next) { |
| 1125 | vma->vm_flags &= ~VM_SOFTDIRTY; |
| 1126 | vma_set_page_prot(vma); |
| 1127 | } |
| 1128 | downgrade_write(&mm->mmap_sem); |
| 1129 | break; |
| 1130 | } |
Pavel Emelyanov | 0f8975e | 2013-07-03 15:01:20 -0700 | [diff] [blame] | 1131 | mmu_notifier_invalidate_range_start(mm, 0, -1); |
Peter Feiner | 64e4550 | 2014-10-13 15:55:46 -0700 | [diff] [blame] | 1132 | } |
James Morse | 0f30206 | 2016-10-07 17:00:06 -0700 | [diff] [blame] | 1133 | walk_page_range(0, mm->highest_vm_end, &clear_refs_walk); |
Pavel Emelyanov | 0f8975e | 2013-07-03 15:01:20 -0700 | [diff] [blame] | 1134 | if (type == CLEAR_REFS_SOFT_DIRTY) |
| 1135 | mmu_notifier_invalidate_range_end(mm, 0, -1); |
Matt Mackall | f248dcb | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 1136 | flush_tlb_mm(mm); |
| 1137 | up_read(&mm->mmap_sem); |
Petr Cermak | 695f055 | 2015-02-12 15:01:00 -0800 | [diff] [blame] | 1138 | out_mm: |
Matt Mackall | f248dcb | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 1139 | mmput(mm); |
| 1140 | } |
| 1141 | put_task_struct(task); |
Vincent Li | fb92a4b | 2009-09-22 16:45:36 -0700 | [diff] [blame] | 1142 | |
| 1143 | return count; |
David Rientjes | b813e93 | 2007-05-06 14:49:24 -0700 | [diff] [blame] | 1144 | } |
| 1145 | |
Matt Mackall | f248dcb | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 1146 | const struct file_operations proc_clear_refs_operations = { |
| 1147 | .write = clear_refs_write, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1148 | .llseek = noop_llseek, |
Matt Mackall | f248dcb | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 1149 | }; |
| 1150 | |
Naoya Horiguchi | 092b50b | 2012-03-21 16:33:59 -0700 | [diff] [blame] | 1151 | typedef struct { |
| 1152 | u64 pme; |
| 1153 | } pagemap_entry_t; |
| 1154 | |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1155 | struct pagemapread { |
yonghua zheng | 8c82962 | 2013-08-13 16:01:03 -0700 | [diff] [blame] | 1156 | int pos, len; /* units: PM_ENTRY_BYTES, not bytes */ |
Naoya Horiguchi | 092b50b | 2012-03-21 16:33:59 -0700 | [diff] [blame] | 1157 | pagemap_entry_t *buffer; |
Konstantin Khlebnikov | 1c90308 | 2015-09-08 15:00:07 -0700 | [diff] [blame] | 1158 | bool show_pfn; |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1159 | }; |
| 1160 | |
Naoya Horiguchi | 5aaabe8 | 2012-03-21 16:33:57 -0700 | [diff] [blame] | 1161 | #define PAGEMAP_WALK_SIZE (PMD_SIZE) |
| 1162 | #define PAGEMAP_WALK_MASK (PMD_MASK) |
| 1163 | |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1164 | #define PM_ENTRY_BYTES sizeof(pagemap_entry_t) |
| 1165 | #define PM_PFRAME_BITS 55 |
| 1166 | #define PM_PFRAME_MASK GENMASK_ULL(PM_PFRAME_BITS - 1, 0) |
| 1167 | #define PM_SOFT_DIRTY BIT_ULL(55) |
Konstantin Khlebnikov | 77bb499 | 2015-09-08 15:00:10 -0700 | [diff] [blame] | 1168 | #define PM_MMAP_EXCLUSIVE BIT_ULL(56) |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1169 | #define PM_FILE BIT_ULL(61) |
| 1170 | #define PM_SWAP BIT_ULL(62) |
| 1171 | #define PM_PRESENT BIT_ULL(63) |
Hans Rosenfeld | f16278c | 2008-03-21 18:46:59 -0500 | [diff] [blame] | 1172 | |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1173 | #define PM_END_OF_BUFFER 1 |
| 1174 | |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1175 | static inline pagemap_entry_t make_pme(u64 frame, u64 flags) |
Naoya Horiguchi | 092b50b | 2012-03-21 16:33:59 -0700 | [diff] [blame] | 1176 | { |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1177 | return (pagemap_entry_t) { .pme = (frame & PM_PFRAME_MASK) | flags }; |
Naoya Horiguchi | 092b50b | 2012-03-21 16:33:59 -0700 | [diff] [blame] | 1178 | } |
| 1179 | |
| 1180 | static int add_to_pagemap(unsigned long addr, pagemap_entry_t *pme, |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1181 | struct pagemapread *pm) |
| 1182 | { |
Naoya Horiguchi | 092b50b | 2012-03-21 16:33:59 -0700 | [diff] [blame] | 1183 | pm->buffer[pm->pos++] = *pme; |
KAMEZAWA Hiroyuki | d82ef02 | 2010-04-02 09:11:29 +0900 | [diff] [blame] | 1184 | if (pm->pos >= pm->len) |
Thomas Tuttle | aae8679 | 2008-06-05 22:46:31 -0700 | [diff] [blame] | 1185 | return PM_END_OF_BUFFER; |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1186 | return 0; |
| 1187 | } |
| 1188 | |
| 1189 | static int pagemap_pte_hole(unsigned long start, unsigned long end, |
Dave Hansen | 2165009 | 2008-06-12 15:21:47 -0700 | [diff] [blame] | 1190 | struct mm_walk *walk) |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1191 | { |
Dave Hansen | 2165009 | 2008-06-12 15:21:47 -0700 | [diff] [blame] | 1192 | struct pagemapread *pm = walk->private; |
Peter Feiner | 68b5a65 | 2014-08-06 16:08:09 -0700 | [diff] [blame] | 1193 | unsigned long addr = start; |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1194 | int err = 0; |
Naoya Horiguchi | 092b50b | 2012-03-21 16:33:59 -0700 | [diff] [blame] | 1195 | |
Peter Feiner | 68b5a65 | 2014-08-06 16:08:09 -0700 | [diff] [blame] | 1196 | while (addr < end) { |
| 1197 | struct vm_area_struct *vma = find_vma(walk->mm, addr); |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1198 | pagemap_entry_t pme = make_pme(0, 0); |
Peter Feiner | 87e6d49 | 2014-09-25 16:05:18 -0700 | [diff] [blame] | 1199 | /* End of address space hole, which we mark as non-present. */ |
| 1200 | unsigned long hole_end; |
Peter Feiner | 68b5a65 | 2014-08-06 16:08:09 -0700 | [diff] [blame] | 1201 | |
Peter Feiner | 87e6d49 | 2014-09-25 16:05:18 -0700 | [diff] [blame] | 1202 | if (vma) |
| 1203 | hole_end = min(end, vma->vm_start); |
| 1204 | else |
| 1205 | hole_end = end; |
| 1206 | |
| 1207 | for (; addr < hole_end; addr += PAGE_SIZE) { |
| 1208 | err = add_to_pagemap(addr, &pme, pm); |
| 1209 | if (err) |
| 1210 | goto out; |
Peter Feiner | 68b5a65 | 2014-08-06 16:08:09 -0700 | [diff] [blame] | 1211 | } |
| 1212 | |
Peter Feiner | 87e6d49 | 2014-09-25 16:05:18 -0700 | [diff] [blame] | 1213 | if (!vma) |
| 1214 | break; |
| 1215 | |
| 1216 | /* Addresses in the VMA. */ |
| 1217 | if (vma->vm_flags & VM_SOFTDIRTY) |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1218 | pme = make_pme(0, PM_SOFT_DIRTY); |
Peter Feiner | 87e6d49 | 2014-09-25 16:05:18 -0700 | [diff] [blame] | 1219 | for (; addr < min(end, vma->vm_end); addr += PAGE_SIZE) { |
Peter Feiner | 68b5a65 | 2014-08-06 16:08:09 -0700 | [diff] [blame] | 1220 | err = add_to_pagemap(addr, &pme, pm); |
| 1221 | if (err) |
| 1222 | goto out; |
| 1223 | } |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1224 | } |
Peter Feiner | 68b5a65 | 2014-08-06 16:08:09 -0700 | [diff] [blame] | 1225 | out: |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1226 | return err; |
| 1227 | } |
| 1228 | |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1229 | static pagemap_entry_t pte_to_pagemap_entry(struct pagemapread *pm, |
Konstantin Khlebnikov | 052fb0d | 2012-05-31 16:26:19 -0700 | [diff] [blame] | 1230 | struct vm_area_struct *vma, unsigned long addr, pte_t pte) |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1231 | { |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1232 | u64 frame = 0, flags = 0; |
Konstantin Khlebnikov | 052fb0d | 2012-05-31 16:26:19 -0700 | [diff] [blame] | 1233 | struct page *page = NULL; |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1234 | |
Konstantin Khlebnikov | 052fb0d | 2012-05-31 16:26:19 -0700 | [diff] [blame] | 1235 | if (pte_present(pte)) { |
Konstantin Khlebnikov | 1c90308 | 2015-09-08 15:00:07 -0700 | [diff] [blame] | 1236 | if (pm->show_pfn) |
| 1237 | frame = pte_pfn(pte); |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1238 | flags |= PM_PRESENT; |
Konstantin Khlebnikov | 052fb0d | 2012-05-31 16:26:19 -0700 | [diff] [blame] | 1239 | page = vm_normal_page(vma, addr, pte); |
Cyrill Gorcunov | e9cdd6e | 2013-10-16 13:46:53 -0700 | [diff] [blame] | 1240 | if (pte_soft_dirty(pte)) |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1241 | flags |= PM_SOFT_DIRTY; |
Konstantin Khlebnikov | 052fb0d | 2012-05-31 16:26:19 -0700 | [diff] [blame] | 1242 | } else if (is_swap_pte(pte)) { |
Cyrill Gorcunov | 179ef71 | 2013-08-13 16:00:49 -0700 | [diff] [blame] | 1243 | swp_entry_t entry; |
| 1244 | if (pte_swp_soft_dirty(pte)) |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1245 | flags |= PM_SOFT_DIRTY; |
Cyrill Gorcunov | 179ef71 | 2013-08-13 16:00:49 -0700 | [diff] [blame] | 1246 | entry = pte_to_swp_entry(pte); |
Konstantin Khlebnikov | 052fb0d | 2012-05-31 16:26:19 -0700 | [diff] [blame] | 1247 | frame = swp_type(entry) | |
| 1248 | (swp_offset(entry) << MAX_SWAPFILES_SHIFT); |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1249 | flags |= PM_SWAP; |
Konstantin Khlebnikov | 052fb0d | 2012-05-31 16:26:19 -0700 | [diff] [blame] | 1250 | if (is_migration_entry(entry)) |
| 1251 | page = migration_entry_to_page(entry); |
Konstantin Khlebnikov | 052fb0d | 2012-05-31 16:26:19 -0700 | [diff] [blame] | 1252 | } |
| 1253 | |
| 1254 | if (page && !PageAnon(page)) |
| 1255 | flags |= PM_FILE; |
Konstantin Khlebnikov | 77bb499 | 2015-09-08 15:00:10 -0700 | [diff] [blame] | 1256 | if (page && page_mapcount(page) == 1) |
| 1257 | flags |= PM_MMAP_EXCLUSIVE; |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1258 | if (vma->vm_flags & VM_SOFTDIRTY) |
| 1259 | flags |= PM_SOFT_DIRTY; |
Konstantin Khlebnikov | 052fb0d | 2012-05-31 16:26:19 -0700 | [diff] [blame] | 1260 | |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1261 | return make_pme(frame, flags); |
Dave Hansen | bcf8039 | 2008-06-12 15:21:48 -0700 | [diff] [blame] | 1262 | } |
| 1263 | |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1264 | static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end, |
Dave Hansen | 2165009 | 2008-06-12 15:21:47 -0700 | [diff] [blame] | 1265 | struct mm_walk *walk) |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1266 | { |
Naoya Horiguchi | f995ece | 2015-02-11 15:27:48 -0800 | [diff] [blame] | 1267 | struct vm_area_struct *vma = walk->vma; |
Dave Hansen | 2165009 | 2008-06-12 15:21:47 -0700 | [diff] [blame] | 1268 | struct pagemapread *pm = walk->private; |
Kirill A. Shutemov | bf92915 | 2013-11-14 14:30:54 -0800 | [diff] [blame] | 1269 | spinlock_t *ptl; |
Konstantin Khlebnikov | 05fbf35 | 2015-02-11 15:27:31 -0800 | [diff] [blame] | 1270 | pte_t *pte, *orig_pte; |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1271 | int err = 0; |
| 1272 | |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1273 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
Kirill A. Shutemov | b6ec57f | 2016-01-21 16:40:25 -0800 | [diff] [blame] | 1274 | ptl = pmd_trans_huge_lock(pmdp, vma); |
| 1275 | if (ptl) { |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1276 | u64 flags = 0, frame = 0; |
| 1277 | pmd_t pmd = *pmdp; |
Pavel Emelyanov | 0f8975e | 2013-07-03 15:01:20 -0700 | [diff] [blame] | 1278 | |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1279 | if ((vma->vm_flags & VM_SOFTDIRTY) || pmd_soft_dirty(pmd)) |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1280 | flags |= PM_SOFT_DIRTY; |
Cyrill Gorcunov | d9104d1 | 2013-09-11 14:22:24 -0700 | [diff] [blame] | 1281 | |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1282 | /* |
| 1283 | * Currently pmd for thp is always present because thp |
| 1284 | * can not be swapped-out, migrated, or HWPOISONed |
| 1285 | * (split in such cases instead.) |
| 1286 | * This if-check is just to prepare for future implementation. |
| 1287 | */ |
| 1288 | if (pmd_present(pmd)) { |
Konstantin Khlebnikov | 77bb499 | 2015-09-08 15:00:10 -0700 | [diff] [blame] | 1289 | struct page *page = pmd_page(pmd); |
| 1290 | |
| 1291 | if (page_mapcount(page) == 1) |
| 1292 | flags |= PM_MMAP_EXCLUSIVE; |
| 1293 | |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1294 | flags |= PM_PRESENT; |
Konstantin Khlebnikov | 1c90308 | 2015-09-08 15:00:07 -0700 | [diff] [blame] | 1295 | if (pm->show_pfn) |
| 1296 | frame = pmd_pfn(pmd) + |
| 1297 | ((addr & ~PMD_MASK) >> PAGE_SHIFT); |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1298 | } |
Naoya Horiguchi | 5aaabe8 | 2012-03-21 16:33:57 -0700 | [diff] [blame] | 1299 | |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1300 | for (; addr != end; addr += PAGE_SIZE) { |
| 1301 | pagemap_entry_t pme = make_pme(frame, flags); |
| 1302 | |
Naoya Horiguchi | 092b50b | 2012-03-21 16:33:59 -0700 | [diff] [blame] | 1303 | err = add_to_pagemap(addr, &pme, pm); |
Naoya Horiguchi | 025c5b2 | 2012-03-21 16:33:57 -0700 | [diff] [blame] | 1304 | if (err) |
| 1305 | break; |
Konstantin Khlebnikov | 1c90308 | 2015-09-08 15:00:07 -0700 | [diff] [blame] | 1306 | if (pm->show_pfn && (flags & PM_PRESENT)) |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1307 | frame++; |
Naoya Horiguchi | 5aaabe8 | 2012-03-21 16:33:57 -0700 | [diff] [blame] | 1308 | } |
Kirill A. Shutemov | bf92915 | 2013-11-14 14:30:54 -0800 | [diff] [blame] | 1309 | spin_unlock(ptl); |
Naoya Horiguchi | 025c5b2 | 2012-03-21 16:33:57 -0700 | [diff] [blame] | 1310 | return err; |
Naoya Horiguchi | 5aaabe8 | 2012-03-21 16:33:57 -0700 | [diff] [blame] | 1311 | } |
| 1312 | |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1313 | if (pmd_trans_unstable(pmdp)) |
Andrea Arcangeli | 45f83ce | 2012-03-28 14:42:40 -0700 | [diff] [blame] | 1314 | return 0; |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1315 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
Dave Hansen | bcf8039 | 2008-06-12 15:21:48 -0700 | [diff] [blame] | 1316 | |
Naoya Horiguchi | f995ece | 2015-02-11 15:27:48 -0800 | [diff] [blame] | 1317 | /* |
| 1318 | * We can assume that @vma always points to a valid one and @end never |
| 1319 | * goes beyond vma->vm_end. |
| 1320 | */ |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1321 | orig_pte = pte = pte_offset_map_lock(walk->mm, pmdp, addr, &ptl); |
Naoya Horiguchi | f995ece | 2015-02-11 15:27:48 -0800 | [diff] [blame] | 1322 | for (; addr < end; pte++, addr += PAGE_SIZE) { |
| 1323 | pagemap_entry_t pme; |
Peter Feiner | 81d0fa6 | 2014-10-09 15:28:32 -0700 | [diff] [blame] | 1324 | |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1325 | pme = pte_to_pagemap_entry(pm, vma, addr, *pte); |
Naoya Horiguchi | f995ece | 2015-02-11 15:27:48 -0800 | [diff] [blame] | 1326 | err = add_to_pagemap(addr, &pme, pm); |
Konstantin Khlebnikov | 05fbf35 | 2015-02-11 15:27:31 -0800 | [diff] [blame] | 1327 | if (err) |
Peter Feiner | 81d0fa6 | 2014-10-09 15:28:32 -0700 | [diff] [blame] | 1328 | break; |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1329 | } |
Naoya Horiguchi | f995ece | 2015-02-11 15:27:48 -0800 | [diff] [blame] | 1330 | pte_unmap_unlock(orig_pte, ptl); |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1331 | |
| 1332 | cond_resched(); |
| 1333 | |
| 1334 | return err; |
| 1335 | } |
| 1336 | |
Naoya Horiguchi | 1a5cb81 | 2010-05-24 14:32:12 -0700 | [diff] [blame] | 1337 | #ifdef CONFIG_HUGETLB_PAGE |
Naoya Horiguchi | 116354d | 2010-04-06 14:35:04 -0700 | [diff] [blame] | 1338 | /* This function walks within one hugetlb entry in the single call */ |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1339 | static int pagemap_hugetlb_range(pte_t *ptep, unsigned long hmask, |
Naoya Horiguchi | 116354d | 2010-04-06 14:35:04 -0700 | [diff] [blame] | 1340 | unsigned long addr, unsigned long end, |
| 1341 | struct mm_walk *walk) |
Naoya Horiguchi | 5dc3764 | 2009-12-14 18:00:01 -0800 | [diff] [blame] | 1342 | { |
Naoya Horiguchi | 5dc3764 | 2009-12-14 18:00:01 -0800 | [diff] [blame] | 1343 | struct pagemapread *pm = walk->private; |
Naoya Horiguchi | f995ece | 2015-02-11 15:27:48 -0800 | [diff] [blame] | 1344 | struct vm_area_struct *vma = walk->vma; |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1345 | u64 flags = 0, frame = 0; |
Naoya Horiguchi | 5dc3764 | 2009-12-14 18:00:01 -0800 | [diff] [blame] | 1346 | int err = 0; |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1347 | pte_t pte; |
Naoya Horiguchi | 5dc3764 | 2009-12-14 18:00:01 -0800 | [diff] [blame] | 1348 | |
Naoya Horiguchi | f995ece | 2015-02-11 15:27:48 -0800 | [diff] [blame] | 1349 | if (vma->vm_flags & VM_SOFTDIRTY) |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1350 | flags |= PM_SOFT_DIRTY; |
Cyrill Gorcunov | d9104d1 | 2013-09-11 14:22:24 -0700 | [diff] [blame] | 1351 | |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1352 | pte = huge_ptep_get(ptep); |
| 1353 | if (pte_present(pte)) { |
| 1354 | struct page *page = pte_page(pte); |
| 1355 | |
| 1356 | if (!PageAnon(page)) |
| 1357 | flags |= PM_FILE; |
| 1358 | |
Konstantin Khlebnikov | 77bb499 | 2015-09-08 15:00:10 -0700 | [diff] [blame] | 1359 | if (page_mapcount(page) == 1) |
| 1360 | flags |= PM_MMAP_EXCLUSIVE; |
| 1361 | |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1362 | flags |= PM_PRESENT; |
Konstantin Khlebnikov | 1c90308 | 2015-09-08 15:00:07 -0700 | [diff] [blame] | 1363 | if (pm->show_pfn) |
| 1364 | frame = pte_pfn(pte) + |
| 1365 | ((addr & ~hmask) >> PAGE_SHIFT); |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1366 | } |
| 1367 | |
Naoya Horiguchi | 5dc3764 | 2009-12-14 18:00:01 -0800 | [diff] [blame] | 1368 | for (; addr != end; addr += PAGE_SIZE) { |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1369 | pagemap_entry_t pme = make_pme(frame, flags); |
| 1370 | |
Naoya Horiguchi | 092b50b | 2012-03-21 16:33:59 -0700 | [diff] [blame] | 1371 | err = add_to_pagemap(addr, &pme, pm); |
Naoya Horiguchi | 5dc3764 | 2009-12-14 18:00:01 -0800 | [diff] [blame] | 1372 | if (err) |
| 1373 | return err; |
Konstantin Khlebnikov | 1c90308 | 2015-09-08 15:00:07 -0700 | [diff] [blame] | 1374 | if (pm->show_pfn && (flags & PM_PRESENT)) |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1375 | frame++; |
Naoya Horiguchi | 5dc3764 | 2009-12-14 18:00:01 -0800 | [diff] [blame] | 1376 | } |
| 1377 | |
| 1378 | cond_resched(); |
| 1379 | |
| 1380 | return err; |
| 1381 | } |
Naoya Horiguchi | 1a5cb81 | 2010-05-24 14:32:12 -0700 | [diff] [blame] | 1382 | #endif /* HUGETLB_PAGE */ |
Naoya Horiguchi | 5dc3764 | 2009-12-14 18:00:01 -0800 | [diff] [blame] | 1383 | |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1384 | /* |
| 1385 | * /proc/pid/pagemap - an array mapping virtual pages to pfns |
| 1386 | * |
Hans Rosenfeld | f16278c | 2008-03-21 18:46:59 -0500 | [diff] [blame] | 1387 | * For each page in the address space, this file contains one 64-bit entry |
| 1388 | * consisting of the following: |
| 1389 | * |
Konstantin Khlebnikov | 052fb0d | 2012-05-31 16:26:19 -0700 | [diff] [blame] | 1390 | * Bits 0-54 page frame number (PFN) if present |
Hans Rosenfeld | f16278c | 2008-03-21 18:46:59 -0500 | [diff] [blame] | 1391 | * Bits 0-4 swap type if swapped |
Konstantin Khlebnikov | 052fb0d | 2012-05-31 16:26:19 -0700 | [diff] [blame] | 1392 | * Bits 5-54 swap offset if swapped |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1393 | * Bit 55 pte is soft-dirty (see Documentation/vm/soft-dirty.txt) |
Konstantin Khlebnikov | 77bb499 | 2015-09-08 15:00:10 -0700 | [diff] [blame] | 1394 | * Bit 56 page exclusively mapped |
| 1395 | * Bits 57-60 zero |
Konstantin Khlebnikov | 052fb0d | 2012-05-31 16:26:19 -0700 | [diff] [blame] | 1396 | * Bit 61 page is file-page or shared-anon |
Hans Rosenfeld | f16278c | 2008-03-21 18:46:59 -0500 | [diff] [blame] | 1397 | * Bit 62 page swapped |
| 1398 | * Bit 63 page present |
| 1399 | * |
| 1400 | * If the page is not present but in swap, then the PFN contains an |
| 1401 | * encoding of the swap file number and the page's offset into the |
| 1402 | * swap. Unmapped pages return a null PFN. This allows determining |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1403 | * precisely which pages are mapped (or in swap) and comparing mapped |
| 1404 | * pages between processes. |
| 1405 | * |
| 1406 | * Efficient users of this interface will use /proc/pid/maps to |
| 1407 | * determine which areas of memory are actually mapped and llseek to |
| 1408 | * skip over unmapped regions. |
| 1409 | */ |
| 1410 | static ssize_t pagemap_read(struct file *file, char __user *buf, |
| 1411 | size_t count, loff_t *ppos) |
| 1412 | { |
Konstantin Khlebnikov | a06db75 | 2015-09-08 14:59:59 -0700 | [diff] [blame] | 1413 | struct mm_struct *mm = file->private_data; |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1414 | struct pagemapread pm; |
Alexey Dobriyan | ee1e6ab | 2008-07-21 14:21:36 -0700 | [diff] [blame] | 1415 | struct mm_walk pagemap_walk = {}; |
Andrew Morton | 5d7e0d2 | 2008-07-05 01:02:01 -0700 | [diff] [blame] | 1416 | unsigned long src; |
| 1417 | unsigned long svpfn; |
| 1418 | unsigned long start_vaddr; |
| 1419 | unsigned long end_vaddr; |
Konstantin Khlebnikov | a06db75 | 2015-09-08 14:59:59 -0700 | [diff] [blame] | 1420 | int ret = 0, copied = 0; |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1421 | |
Konstantin Khlebnikov | a06db75 | 2015-09-08 14:59:59 -0700 | [diff] [blame] | 1422 | if (!mm || !atomic_inc_not_zero(&mm->mm_users)) |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1423 | goto out; |
| 1424 | |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1425 | ret = -EINVAL; |
| 1426 | /* file position must be aligned */ |
Thomas Tuttle | aae8679 | 2008-06-05 22:46:31 -0700 | [diff] [blame] | 1427 | if ((*ppos % PM_ENTRY_BYTES) || (count % PM_ENTRY_BYTES)) |
Konstantin Khlebnikov | a06db75 | 2015-09-08 14:59:59 -0700 | [diff] [blame] | 1428 | goto out_mm; |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1429 | |
| 1430 | ret = 0; |
Vitaly Mayatskikh | 0816178 | 2009-04-30 15:08:18 -0700 | [diff] [blame] | 1431 | if (!count) |
Konstantin Khlebnikov | a06db75 | 2015-09-08 14:59:59 -0700 | [diff] [blame] | 1432 | goto out_mm; |
Vitaly Mayatskikh | 0816178 | 2009-04-30 15:08:18 -0700 | [diff] [blame] | 1433 | |
Konstantin Khlebnikov | 1c90308 | 2015-09-08 15:00:07 -0700 | [diff] [blame] | 1434 | /* do not disclose physical addresses: attack vector */ |
| 1435 | pm.show_pfn = file_ns_capable(file, &init_user_ns, CAP_SYS_ADMIN); |
| 1436 | |
yonghua zheng | 8c82962 | 2013-08-13 16:01:03 -0700 | [diff] [blame] | 1437 | pm.len = (PAGEMAP_WALK_SIZE >> PAGE_SHIFT); |
| 1438 | pm.buffer = kmalloc(pm.len * PM_ENTRY_BYTES, GFP_TEMPORARY); |
Andrew Morton | 5d7e0d2 | 2008-07-05 01:02:01 -0700 | [diff] [blame] | 1439 | ret = -ENOMEM; |
KAMEZAWA Hiroyuki | d82ef02 | 2010-04-02 09:11:29 +0900 | [diff] [blame] | 1440 | if (!pm.buffer) |
Konstantin Khlebnikov | a06db75 | 2015-09-08 14:59:59 -0700 | [diff] [blame] | 1441 | goto out_mm; |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1442 | |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1443 | pagemap_walk.pmd_entry = pagemap_pmd_range; |
Andrew Morton | 5d7e0d2 | 2008-07-05 01:02:01 -0700 | [diff] [blame] | 1444 | pagemap_walk.pte_hole = pagemap_pte_hole; |
Naoya Horiguchi | 1a5cb81 | 2010-05-24 14:32:12 -0700 | [diff] [blame] | 1445 | #ifdef CONFIG_HUGETLB_PAGE |
Naoya Horiguchi | 5dc3764 | 2009-12-14 18:00:01 -0800 | [diff] [blame] | 1446 | pagemap_walk.hugetlb_entry = pagemap_hugetlb_range; |
Naoya Horiguchi | 1a5cb81 | 2010-05-24 14:32:12 -0700 | [diff] [blame] | 1447 | #endif |
Andrew Morton | 5d7e0d2 | 2008-07-05 01:02:01 -0700 | [diff] [blame] | 1448 | pagemap_walk.mm = mm; |
| 1449 | pagemap_walk.private = ± |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1450 | |
Andrew Morton | 5d7e0d2 | 2008-07-05 01:02:01 -0700 | [diff] [blame] | 1451 | src = *ppos; |
| 1452 | svpfn = src / PM_ENTRY_BYTES; |
| 1453 | start_vaddr = svpfn << PAGE_SHIFT; |
Konstantin Khlebnikov | a06db75 | 2015-09-08 14:59:59 -0700 | [diff] [blame] | 1454 | end_vaddr = mm->task_size; |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1455 | |
Andrew Morton | 5d7e0d2 | 2008-07-05 01:02:01 -0700 | [diff] [blame] | 1456 | /* watch out for wraparound */ |
Konstantin Khlebnikov | a06db75 | 2015-09-08 14:59:59 -0700 | [diff] [blame] | 1457 | if (svpfn > mm->task_size >> PAGE_SHIFT) |
Andrew Morton | 5d7e0d2 | 2008-07-05 01:02:01 -0700 | [diff] [blame] | 1458 | start_vaddr = end_vaddr; |
| 1459 | |
| 1460 | /* |
| 1461 | * The odds are that this will stop walking way |
| 1462 | * before end_vaddr, because the length of the |
| 1463 | * user buffer is tracked in "pm", and the walk |
| 1464 | * will stop when we hit the end of the buffer. |
| 1465 | */ |
KAMEZAWA Hiroyuki | d82ef02 | 2010-04-02 09:11:29 +0900 | [diff] [blame] | 1466 | ret = 0; |
| 1467 | while (count && (start_vaddr < end_vaddr)) { |
| 1468 | int len; |
| 1469 | unsigned long end; |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1470 | |
KAMEZAWA Hiroyuki | d82ef02 | 2010-04-02 09:11:29 +0900 | [diff] [blame] | 1471 | pm.pos = 0; |
Naoya Horiguchi | ea251c1 | 2010-11-24 12:57:13 -0800 | [diff] [blame] | 1472 | end = (start_vaddr + PAGEMAP_WALK_SIZE) & PAGEMAP_WALK_MASK; |
KAMEZAWA Hiroyuki | d82ef02 | 2010-04-02 09:11:29 +0900 | [diff] [blame] | 1473 | /* overflow ? */ |
| 1474 | if (end < start_vaddr || end > end_vaddr) |
| 1475 | end = end_vaddr; |
| 1476 | down_read(&mm->mmap_sem); |
| 1477 | ret = walk_page_range(start_vaddr, end, &pagemap_walk); |
| 1478 | up_read(&mm->mmap_sem); |
| 1479 | start_vaddr = end; |
| 1480 | |
| 1481 | len = min(count, PM_ENTRY_BYTES * pm.pos); |
Dan Carpenter | 309361e0 | 2010-04-06 13:45:39 +0300 | [diff] [blame] | 1482 | if (copy_to_user(buf, pm.buffer, len)) { |
KAMEZAWA Hiroyuki | d82ef02 | 2010-04-02 09:11:29 +0900 | [diff] [blame] | 1483 | ret = -EFAULT; |
Konstantin Khlebnikov | a06db75 | 2015-09-08 14:59:59 -0700 | [diff] [blame] | 1484 | goto out_free; |
KAMEZAWA Hiroyuki | d82ef02 | 2010-04-02 09:11:29 +0900 | [diff] [blame] | 1485 | } |
| 1486 | copied += len; |
| 1487 | buf += len; |
| 1488 | count -= len; |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1489 | } |
KAMEZAWA Hiroyuki | d82ef02 | 2010-04-02 09:11:29 +0900 | [diff] [blame] | 1490 | *ppos += copied; |
| 1491 | if (!ret || ret == PM_END_OF_BUFFER) |
| 1492 | ret = copied; |
| 1493 | |
KOSAKI Motohiro | 98bc93e | 2011-05-26 16:25:53 -0700 | [diff] [blame] | 1494 | out_free: |
| 1495 | kfree(pm.buffer); |
Konstantin Khlebnikov | a06db75 | 2015-09-08 14:59:59 -0700 | [diff] [blame] | 1496 | out_mm: |
| 1497 | mmput(mm); |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1498 | out: |
| 1499 | return ret; |
| 1500 | } |
| 1501 | |
Pavel Emelyanov | 541c237 | 2013-07-03 15:01:22 -0700 | [diff] [blame] | 1502 | static int pagemap_open(struct inode *inode, struct file *file) |
| 1503 | { |
Konstantin Khlebnikov | a06db75 | 2015-09-08 14:59:59 -0700 | [diff] [blame] | 1504 | struct mm_struct *mm; |
| 1505 | |
Konstantin Khlebnikov | a06db75 | 2015-09-08 14:59:59 -0700 | [diff] [blame] | 1506 | mm = proc_mem_open(inode, PTRACE_MODE_READ); |
| 1507 | if (IS_ERR(mm)) |
| 1508 | return PTR_ERR(mm); |
| 1509 | file->private_data = mm; |
| 1510 | return 0; |
| 1511 | } |
| 1512 | |
| 1513 | static int pagemap_release(struct inode *inode, struct file *file) |
| 1514 | { |
| 1515 | struct mm_struct *mm = file->private_data; |
| 1516 | |
| 1517 | if (mm) |
| 1518 | mmdrop(mm); |
Pavel Emelyanov | 541c237 | 2013-07-03 15:01:22 -0700 | [diff] [blame] | 1519 | return 0; |
| 1520 | } |
| 1521 | |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1522 | const struct file_operations proc_pagemap_operations = { |
| 1523 | .llseek = mem_lseek, /* borrow this */ |
| 1524 | .read = pagemap_read, |
Pavel Emelyanov | 541c237 | 2013-07-03 15:01:22 -0700 | [diff] [blame] | 1525 | .open = pagemap_open, |
Konstantin Khlebnikov | a06db75 | 2015-09-08 14:59:59 -0700 | [diff] [blame] | 1526 | .release = pagemap_release, |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1527 | }; |
Matt Mackall | 1e88328 | 2008-02-04 22:29:07 -0800 | [diff] [blame] | 1528 | #endif /* CONFIG_PROC_PAGE_MONITOR */ |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1529 | |
Minchan Kim | ff92689 | 2013-05-09 16:21:24 +0900 | [diff] [blame] | 1530 | #ifdef CONFIG_PROCESS_RECLAIM |
| 1531 | static int reclaim_pte_range(pmd_t *pmd, unsigned long addr, |
| 1532 | unsigned long end, struct mm_walk *walk) |
| 1533 | { |
| 1534 | struct vm_area_struct *vma = walk->private; |
| 1535 | pte_t *pte, ptent; |
| 1536 | spinlock_t *ptl; |
| 1537 | struct page *page; |
| 1538 | LIST_HEAD(page_list); |
| 1539 | int isolated; |
| 1540 | |
| 1541 | split_huge_pmd(vma, addr, pmd); |
| 1542 | if (pmd_trans_unstable(pmd)) |
| 1543 | return 0; |
| 1544 | cont: |
| 1545 | isolated = 0; |
| 1546 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
| 1547 | for (; addr != end; pte++, addr += PAGE_SIZE) { |
| 1548 | ptent = *pte; |
| 1549 | if (!pte_present(ptent)) |
| 1550 | continue; |
| 1551 | |
| 1552 | page = vm_normal_page(vma, addr, ptent); |
| 1553 | if (!page) |
| 1554 | continue; |
| 1555 | |
| 1556 | if (isolate_lru_page(page)) |
| 1557 | continue; |
| 1558 | |
| 1559 | list_add(&page->lru, &page_list); |
| 1560 | inc_node_page_state(page, NR_ISOLATED_ANON + |
| 1561 | page_is_file_cache(page)); |
| 1562 | isolated++; |
| 1563 | if (isolated >= SWAP_CLUSTER_MAX) |
| 1564 | break; |
| 1565 | } |
| 1566 | pte_unmap_unlock(pte - 1, ptl); |
Minchan Kim | cd256bf | 2013-05-09 16:21:27 +0900 | [diff] [blame^] | 1567 | reclaim_pages_from_list(&page_list, vma); |
Minchan Kim | ff92689 | 2013-05-09 16:21:24 +0900 | [diff] [blame] | 1568 | if (addr != end) |
| 1569 | goto cont; |
| 1570 | |
| 1571 | cond_resched(); |
| 1572 | return 0; |
| 1573 | } |
| 1574 | |
| 1575 | enum reclaim_type { |
| 1576 | RECLAIM_FILE, |
| 1577 | RECLAIM_ANON, |
| 1578 | RECLAIM_ALL, |
| 1579 | RECLAIM_RANGE, |
| 1580 | }; |
| 1581 | |
| 1582 | static ssize_t reclaim_write(struct file *file, const char __user *buf, |
| 1583 | size_t count, loff_t *ppos) |
| 1584 | { |
| 1585 | struct task_struct *task; |
| 1586 | char buffer[PROC_NUMBUF]; |
| 1587 | struct mm_struct *mm; |
| 1588 | struct vm_area_struct *vma; |
| 1589 | enum reclaim_type type; |
| 1590 | char *type_buf; |
| 1591 | |
| 1592 | memset(buffer, 0, sizeof(buffer)); |
| 1593 | if (count > sizeof(buffer) - 1) |
| 1594 | count = sizeof(buffer) - 1; |
| 1595 | |
| 1596 | if (copy_from_user(buffer, buf, count)) |
| 1597 | return -EFAULT; |
| 1598 | |
| 1599 | type_buf = strstrip(buffer); |
| 1600 | if (!strcmp(type_buf, "file")) |
| 1601 | type = RECLAIM_FILE; |
| 1602 | else if (!strcmp(type_buf, "anon")) |
| 1603 | type = RECLAIM_ANON; |
| 1604 | else if (!strcmp(type_buf, "all")) |
| 1605 | type = RECLAIM_ALL; |
| 1606 | else |
| 1607 | return -EINVAL; |
| 1608 | |
| 1609 | task = get_proc_task(file->f_path.dentry->d_inode); |
| 1610 | if (!task) |
| 1611 | return -ESRCH; |
| 1612 | |
| 1613 | mm = get_task_mm(task); |
| 1614 | if (mm) { |
| 1615 | struct mm_walk reclaim_walk = { |
| 1616 | .pmd_entry = reclaim_pte_range, |
| 1617 | .mm = mm, |
| 1618 | }; |
| 1619 | |
| 1620 | down_read(&mm->mmap_sem); |
| 1621 | for (vma = mm->mmap; vma; vma = vma->vm_next) { |
| 1622 | reclaim_walk.private = vma; |
| 1623 | |
| 1624 | if (is_vm_hugetlb_page(vma)) |
| 1625 | continue; |
| 1626 | |
| 1627 | if (type == RECLAIM_ANON && vma->vm_file) |
| 1628 | continue; |
| 1629 | if (type == RECLAIM_FILE && !vma->vm_file) |
| 1630 | continue; |
| 1631 | |
| 1632 | walk_page_range(vma->vm_start, vma->vm_end, |
| 1633 | &reclaim_walk); |
| 1634 | } |
| 1635 | flush_tlb_mm(mm); |
| 1636 | up_read(&mm->mmap_sem); |
| 1637 | mmput(mm); |
| 1638 | } |
| 1639 | put_task_struct(task); |
| 1640 | |
| 1641 | return count; |
| 1642 | } |
| 1643 | |
| 1644 | const struct file_operations proc_reclaim_operations = { |
| 1645 | .write = reclaim_write, |
| 1646 | .llseek = noop_llseek, |
| 1647 | }; |
| 1648 | #endif |
| 1649 | |
Christoph Lameter | 6e21c8f | 2005-09-03 15:54:45 -0700 | [diff] [blame] | 1650 | #ifdef CONFIG_NUMA |
Christoph Lameter | 6e21c8f | 2005-09-03 15:54:45 -0700 | [diff] [blame] | 1651 | |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1652 | struct numa_maps { |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1653 | unsigned long pages; |
| 1654 | unsigned long anon; |
| 1655 | unsigned long active; |
| 1656 | unsigned long writeback; |
| 1657 | unsigned long mapcount_max; |
| 1658 | unsigned long dirty; |
| 1659 | unsigned long swapcache; |
| 1660 | unsigned long node[MAX_NUMNODES]; |
| 1661 | }; |
| 1662 | |
Stephen Wilson | 5b52fc8 | 2011-05-24 17:12:49 -0700 | [diff] [blame] | 1663 | struct numa_maps_private { |
| 1664 | struct proc_maps_private proc_maps; |
| 1665 | struct numa_maps md; |
| 1666 | }; |
| 1667 | |
Dave Hansen | eb4866d | 2011-09-20 15:19:38 -0700 | [diff] [blame] | 1668 | static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty, |
| 1669 | unsigned long nr_pages) |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1670 | { |
| 1671 | int count = page_mapcount(page); |
| 1672 | |
Dave Hansen | eb4866d | 2011-09-20 15:19:38 -0700 | [diff] [blame] | 1673 | md->pages += nr_pages; |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1674 | if (pte_dirty || PageDirty(page)) |
Dave Hansen | eb4866d | 2011-09-20 15:19:38 -0700 | [diff] [blame] | 1675 | md->dirty += nr_pages; |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1676 | |
| 1677 | if (PageSwapCache(page)) |
Dave Hansen | eb4866d | 2011-09-20 15:19:38 -0700 | [diff] [blame] | 1678 | md->swapcache += nr_pages; |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1679 | |
| 1680 | if (PageActive(page) || PageUnevictable(page)) |
Dave Hansen | eb4866d | 2011-09-20 15:19:38 -0700 | [diff] [blame] | 1681 | md->active += nr_pages; |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1682 | |
| 1683 | if (PageWriteback(page)) |
Dave Hansen | eb4866d | 2011-09-20 15:19:38 -0700 | [diff] [blame] | 1684 | md->writeback += nr_pages; |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1685 | |
| 1686 | if (PageAnon(page)) |
Dave Hansen | eb4866d | 2011-09-20 15:19:38 -0700 | [diff] [blame] | 1687 | md->anon += nr_pages; |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1688 | |
| 1689 | if (count > md->mapcount_max) |
| 1690 | md->mapcount_max = count; |
| 1691 | |
Dave Hansen | eb4866d | 2011-09-20 15:19:38 -0700 | [diff] [blame] | 1692 | md->node[page_to_nid(page)] += nr_pages; |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1693 | } |
| 1694 | |
Dave Hansen | 3200a8a | 2011-09-20 15:19:39 -0700 | [diff] [blame] | 1695 | static struct page *can_gather_numa_stats(pte_t pte, struct vm_area_struct *vma, |
| 1696 | unsigned long addr) |
| 1697 | { |
| 1698 | struct page *page; |
| 1699 | int nid; |
| 1700 | |
| 1701 | if (!pte_present(pte)) |
| 1702 | return NULL; |
| 1703 | |
| 1704 | page = vm_normal_page(vma, addr, pte); |
| 1705 | if (!page) |
| 1706 | return NULL; |
| 1707 | |
| 1708 | if (PageReserved(page)) |
| 1709 | return NULL; |
| 1710 | |
| 1711 | nid = page_to_nid(page); |
Lai Jiangshan | 4ff1b2c | 2012-12-12 13:51:25 -0800 | [diff] [blame] | 1712 | if (!node_isset(nid, node_states[N_MEMORY])) |
Dave Hansen | 3200a8a | 2011-09-20 15:19:39 -0700 | [diff] [blame] | 1713 | return NULL; |
| 1714 | |
| 1715 | return page; |
| 1716 | } |
| 1717 | |
Gerald Schaefer | 28093f9 | 2016-04-28 16:18:35 -0700 | [diff] [blame] | 1718 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| 1719 | static struct page *can_gather_numa_stats_pmd(pmd_t pmd, |
| 1720 | struct vm_area_struct *vma, |
| 1721 | unsigned long addr) |
| 1722 | { |
| 1723 | struct page *page; |
| 1724 | int nid; |
| 1725 | |
| 1726 | if (!pmd_present(pmd)) |
| 1727 | return NULL; |
| 1728 | |
| 1729 | page = vm_normal_page_pmd(vma, addr, pmd); |
| 1730 | if (!page) |
| 1731 | return NULL; |
| 1732 | |
| 1733 | if (PageReserved(page)) |
| 1734 | return NULL; |
| 1735 | |
| 1736 | nid = page_to_nid(page); |
| 1737 | if (!node_isset(nid, node_states[N_MEMORY])) |
| 1738 | return NULL; |
| 1739 | |
| 1740 | return page; |
| 1741 | } |
| 1742 | #endif |
| 1743 | |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1744 | static int gather_pte_stats(pmd_t *pmd, unsigned long addr, |
| 1745 | unsigned long end, struct mm_walk *walk) |
| 1746 | { |
Naoya Horiguchi | d85f4d6 | 2015-02-11 15:27:54 -0800 | [diff] [blame] | 1747 | struct numa_maps *md = walk->private; |
| 1748 | struct vm_area_struct *vma = walk->vma; |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1749 | spinlock_t *ptl; |
| 1750 | pte_t *orig_pte; |
| 1751 | pte_t *pte; |
| 1752 | |
Gerald Schaefer | 28093f9 | 2016-04-28 16:18:35 -0700 | [diff] [blame] | 1753 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
Kirill A. Shutemov | b6ec57f | 2016-01-21 16:40:25 -0800 | [diff] [blame] | 1754 | ptl = pmd_trans_huge_lock(pmd, vma); |
| 1755 | if (ptl) { |
Naoya Horiguchi | 025c5b2 | 2012-03-21 16:33:57 -0700 | [diff] [blame] | 1756 | struct page *page; |
| 1757 | |
Gerald Schaefer | 28093f9 | 2016-04-28 16:18:35 -0700 | [diff] [blame] | 1758 | page = can_gather_numa_stats_pmd(*pmd, vma, addr); |
Naoya Horiguchi | 025c5b2 | 2012-03-21 16:33:57 -0700 | [diff] [blame] | 1759 | if (page) |
Gerald Schaefer | 28093f9 | 2016-04-28 16:18:35 -0700 | [diff] [blame] | 1760 | gather_stats(page, md, pmd_dirty(*pmd), |
Naoya Horiguchi | 025c5b2 | 2012-03-21 16:33:57 -0700 | [diff] [blame] | 1761 | HPAGE_PMD_SIZE/PAGE_SIZE); |
Kirill A. Shutemov | bf92915 | 2013-11-14 14:30:54 -0800 | [diff] [blame] | 1762 | spin_unlock(ptl); |
Naoya Horiguchi | 025c5b2 | 2012-03-21 16:33:57 -0700 | [diff] [blame] | 1763 | return 0; |
Dave Hansen | 32ef438 | 2011-09-20 15:19:41 -0700 | [diff] [blame] | 1764 | } |
| 1765 | |
Andrea Arcangeli | 1a5a990 | 2012-03-21 16:33:42 -0700 | [diff] [blame] | 1766 | if (pmd_trans_unstable(pmd)) |
| 1767 | return 0; |
Gerald Schaefer | 28093f9 | 2016-04-28 16:18:35 -0700 | [diff] [blame] | 1768 | #endif |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1769 | orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl); |
| 1770 | do { |
Naoya Horiguchi | d85f4d6 | 2015-02-11 15:27:54 -0800 | [diff] [blame] | 1771 | struct page *page = can_gather_numa_stats(*pte, vma, addr); |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1772 | if (!page) |
| 1773 | continue; |
Dave Hansen | eb4866d | 2011-09-20 15:19:38 -0700 | [diff] [blame] | 1774 | gather_stats(page, md, pte_dirty(*pte), 1); |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1775 | |
| 1776 | } while (pte++, addr += PAGE_SIZE, addr != end); |
| 1777 | pte_unmap_unlock(orig_pte, ptl); |
| 1778 | return 0; |
| 1779 | } |
| 1780 | #ifdef CONFIG_HUGETLB_PAGE |
Naoya Horiguchi | 632fd60 | 2015-02-11 15:27:51 -0800 | [diff] [blame] | 1781 | static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask, |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1782 | unsigned long addr, unsigned long end, struct mm_walk *walk) |
| 1783 | { |
Michael Holzheu | 5c2ff95 | 2016-02-02 16:57:26 -0800 | [diff] [blame] | 1784 | pte_t huge_pte = huge_ptep_get(pte); |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1785 | struct numa_maps *md; |
| 1786 | struct page *page; |
| 1787 | |
Michael Holzheu | 5c2ff95 | 2016-02-02 16:57:26 -0800 | [diff] [blame] | 1788 | if (!pte_present(huge_pte)) |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1789 | return 0; |
| 1790 | |
Michael Holzheu | 5c2ff95 | 2016-02-02 16:57:26 -0800 | [diff] [blame] | 1791 | page = pte_page(huge_pte); |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1792 | if (!page) |
| 1793 | return 0; |
| 1794 | |
| 1795 | md = walk->private; |
Michael Holzheu | 5c2ff95 | 2016-02-02 16:57:26 -0800 | [diff] [blame] | 1796 | gather_stats(page, md, pte_dirty(huge_pte), 1); |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1797 | return 0; |
| 1798 | } |
| 1799 | |
| 1800 | #else |
Naoya Horiguchi | 632fd60 | 2015-02-11 15:27:51 -0800 | [diff] [blame] | 1801 | static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask, |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1802 | unsigned long addr, unsigned long end, struct mm_walk *walk) |
| 1803 | { |
| 1804 | return 0; |
| 1805 | } |
| 1806 | #endif |
| 1807 | |
| 1808 | /* |
| 1809 | * Display pages allocated per node and memory policy via /proc. |
| 1810 | */ |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 1811 | static int show_numa_map(struct seq_file *m, void *v, int is_pid) |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1812 | { |
Stephen Wilson | 5b52fc8 | 2011-05-24 17:12:49 -0700 | [diff] [blame] | 1813 | struct numa_maps_private *numa_priv = m->private; |
| 1814 | struct proc_maps_private *proc_priv = &numa_priv->proc_maps; |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1815 | struct vm_area_struct *vma = v; |
Stephen Wilson | 5b52fc8 | 2011-05-24 17:12:49 -0700 | [diff] [blame] | 1816 | struct numa_maps *md = &numa_priv->md; |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1817 | struct file *file = vma->vm_file; |
| 1818 | struct mm_struct *mm = vma->vm_mm; |
Naoya Horiguchi | d85f4d6 | 2015-02-11 15:27:54 -0800 | [diff] [blame] | 1819 | struct mm_walk walk = { |
| 1820 | .hugetlb_entry = gather_hugetlb_stats, |
| 1821 | .pmd_entry = gather_pte_stats, |
| 1822 | .private = md, |
| 1823 | .mm = mm, |
| 1824 | }; |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1825 | struct mempolicy *pol; |
David Rientjes | 948927e | 2013-11-12 15:07:28 -0800 | [diff] [blame] | 1826 | char buffer[64]; |
| 1827 | int nid; |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1828 | |
| 1829 | if (!mm) |
| 1830 | return 0; |
| 1831 | |
Stephen Wilson | 5b52fc8 | 2011-05-24 17:12:49 -0700 | [diff] [blame] | 1832 | /* Ensure we start with an empty set of numa_maps statistics. */ |
| 1833 | memset(md, 0, sizeof(*md)); |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1834 | |
Oleg Nesterov | 498f237 | 2014-10-09 15:27:52 -0700 | [diff] [blame] | 1835 | pol = __get_vma_policy(vma, vma->vm_start); |
| 1836 | if (pol) { |
| 1837 | mpol_to_str(buffer, sizeof(buffer), pol); |
| 1838 | mpol_cond_put(pol); |
| 1839 | } else { |
| 1840 | mpol_to_str(buffer, sizeof(buffer), proc_priv->task_mempolicy); |
| 1841 | } |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1842 | |
| 1843 | seq_printf(m, "%08lx %s", vma->vm_start, buffer); |
| 1844 | |
| 1845 | if (file) { |
Fabian Frederick | 17c2b4e | 2014-06-06 14:37:03 -0700 | [diff] [blame] | 1846 | seq_puts(m, " file="); |
Miklos Szeredi | 2726d56 | 2015-06-19 10:30:28 +0200 | [diff] [blame] | 1847 | seq_file_path(m, file, "\n\t= "); |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1848 | } else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) { |
Fabian Frederick | 17c2b4e | 2014-06-06 14:37:03 -0700 | [diff] [blame] | 1849 | seq_puts(m, " heap"); |
Andy Lutomirski | b18cb64 | 2016-09-30 10:58:57 -0700 | [diff] [blame] | 1850 | } else if (is_stack(proc_priv, vma)) { |
Johannes Weiner | 65376df | 2016-02-02 16:57:29 -0800 | [diff] [blame] | 1851 | seq_puts(m, " stack"); |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1852 | } |
| 1853 | |
Andrew Morton | fc360bd | 2011-10-31 17:06:32 -0700 | [diff] [blame] | 1854 | if (is_vm_hugetlb_page(vma)) |
Fabian Frederick | 17c2b4e | 2014-06-06 14:37:03 -0700 | [diff] [blame] | 1855 | seq_puts(m, " huge"); |
Andrew Morton | fc360bd | 2011-10-31 17:06:32 -0700 | [diff] [blame] | 1856 | |
Naoya Horiguchi | d85f4d6 | 2015-02-11 15:27:54 -0800 | [diff] [blame] | 1857 | /* mmap_sem is held by m_start */ |
| 1858 | walk_page_vma(vma, &walk); |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1859 | |
| 1860 | if (!md->pages) |
| 1861 | goto out; |
| 1862 | |
| 1863 | if (md->anon) |
| 1864 | seq_printf(m, " anon=%lu", md->anon); |
| 1865 | |
| 1866 | if (md->dirty) |
| 1867 | seq_printf(m, " dirty=%lu", md->dirty); |
| 1868 | |
| 1869 | if (md->pages != md->anon && md->pages != md->dirty) |
| 1870 | seq_printf(m, " mapped=%lu", md->pages); |
| 1871 | |
| 1872 | if (md->mapcount_max > 1) |
| 1873 | seq_printf(m, " mapmax=%lu", md->mapcount_max); |
| 1874 | |
| 1875 | if (md->swapcache) |
| 1876 | seq_printf(m, " swapcache=%lu", md->swapcache); |
| 1877 | |
| 1878 | if (md->active < md->pages && !is_vm_hugetlb_page(vma)) |
| 1879 | seq_printf(m, " active=%lu", md->active); |
| 1880 | |
| 1881 | if (md->writeback) |
| 1882 | seq_printf(m, " writeback=%lu", md->writeback); |
| 1883 | |
David Rientjes | 948927e | 2013-11-12 15:07:28 -0800 | [diff] [blame] | 1884 | for_each_node_state(nid, N_MEMORY) |
| 1885 | if (md->node[nid]) |
| 1886 | seq_printf(m, " N%d=%lu", nid, md->node[nid]); |
Rafael Aquini | 198d159 | 2015-02-12 15:01:08 -0800 | [diff] [blame] | 1887 | |
| 1888 | seq_printf(m, " kernelpagesize_kB=%lu", vma_kernel_pagesize(vma) >> 10); |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1889 | out: |
| 1890 | seq_putc(m, '\n'); |
Oleg Nesterov | b8c20a9 | 2014-10-09 15:25:41 -0700 | [diff] [blame] | 1891 | m_cache_vma(m, vma); |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1892 | return 0; |
| 1893 | } |
Stephen Wilson | 5b52fc8 | 2011-05-24 17:12:49 -0700 | [diff] [blame] | 1894 | |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 1895 | static int show_pid_numa_map(struct seq_file *m, void *v) |
| 1896 | { |
| 1897 | return show_numa_map(m, v, 1); |
| 1898 | } |
| 1899 | |
| 1900 | static int show_tid_numa_map(struct seq_file *m, void *v) |
| 1901 | { |
| 1902 | return show_numa_map(m, v, 0); |
| 1903 | } |
| 1904 | |
Jan Engelhardt | 03a4482 | 2008-02-08 04:21:19 -0800 | [diff] [blame] | 1905 | static const struct seq_operations proc_pid_numa_maps_op = { |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 1906 | .start = m_start, |
| 1907 | .next = m_next, |
| 1908 | .stop = m_stop, |
| 1909 | .show = show_pid_numa_map, |
Christoph Lameter | 6e21c8f | 2005-09-03 15:54:45 -0700 | [diff] [blame] | 1910 | }; |
Eric W. Biederman | 662795d | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 1911 | |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 1912 | static const struct seq_operations proc_tid_numa_maps_op = { |
| 1913 | .start = m_start, |
| 1914 | .next = m_next, |
| 1915 | .stop = m_stop, |
| 1916 | .show = show_tid_numa_map, |
| 1917 | }; |
| 1918 | |
| 1919 | static int numa_maps_open(struct inode *inode, struct file *file, |
| 1920 | const struct seq_operations *ops) |
Eric W. Biederman | 662795d | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 1921 | { |
Oleg Nesterov | 4db7d0e | 2014-10-09 15:25:21 -0700 | [diff] [blame] | 1922 | return proc_maps_open(inode, file, ops, |
| 1923 | sizeof(struct numa_maps_private)); |
Eric W. Biederman | 662795d | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 1924 | } |
| 1925 | |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 1926 | static int pid_numa_maps_open(struct inode *inode, struct file *file) |
| 1927 | { |
| 1928 | return numa_maps_open(inode, file, &proc_pid_numa_maps_op); |
| 1929 | } |
| 1930 | |
| 1931 | static int tid_numa_maps_open(struct inode *inode, struct file *file) |
| 1932 | { |
| 1933 | return numa_maps_open(inode, file, &proc_tid_numa_maps_op); |
| 1934 | } |
| 1935 | |
| 1936 | const struct file_operations proc_pid_numa_maps_operations = { |
| 1937 | .open = pid_numa_maps_open, |
| 1938 | .read = seq_read, |
| 1939 | .llseek = seq_lseek, |
Oleg Nesterov | 29a40ac | 2014-10-09 15:25:26 -0700 | [diff] [blame] | 1940 | .release = proc_map_release, |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 1941 | }; |
| 1942 | |
| 1943 | const struct file_operations proc_tid_numa_maps_operations = { |
| 1944 | .open = tid_numa_maps_open, |
Eric W. Biederman | 662795d | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 1945 | .read = seq_read, |
| 1946 | .llseek = seq_lseek, |
Oleg Nesterov | 29a40ac | 2014-10-09 15:25:26 -0700 | [diff] [blame] | 1947 | .release = proc_map_release, |
Eric W. Biederman | 662795d | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 1948 | }; |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1949 | #endif /* CONFIG_NUMA */ |