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-rw-r--r--fs/proc/task_mmu.c96
1 files changed, 59 insertions, 37 deletions
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 4e0023643f8b..8b4f3073f8f5 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -1,6 +1,5 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/pagewalk.h>
-#include <linux/vmacache.h>
#include <linux/mm_inline.h>
#include <linux/hugetlb.h>
#include <linux/huge_mm.h>
@@ -124,12 +123,26 @@ static void release_task_mempolicy(struct proc_maps_private *priv)
}
#endif
+static struct vm_area_struct *proc_get_vma(struct proc_maps_private *priv,
+ loff_t *ppos)
+{
+ struct vm_area_struct *vma = vma_next(&priv->iter);
+
+ if (vma) {
+ *ppos = vma->vm_start;
+ } else {
+ *ppos = -2UL;
+ vma = get_gate_vma(priv->mm);
+ }
+
+ return vma;
+}
+
static void *m_start(struct seq_file *m, loff_t *ppos)
{
struct proc_maps_private *priv = m->private;
unsigned long last_addr = *ppos;
struct mm_struct *mm;
- struct vm_area_struct *vma;
/* See m_next(). Zero at the start or after lseek. */
if (last_addr == -1UL)
@@ -153,31 +166,21 @@ static void *m_start(struct seq_file *m, loff_t *ppos)
return ERR_PTR(-EINTR);
}
+ vma_iter_init(&priv->iter, mm, last_addr);
hold_task_mempolicy(priv);
- priv->tail_vma = get_gate_vma(mm);
-
- vma = find_vma(mm, last_addr);
- if (vma)
- return vma;
+ if (last_addr == -2UL)
+ return get_gate_vma(mm);
- return priv->tail_vma;
+ return proc_get_vma(priv, ppos);
}
static void *m_next(struct seq_file *m, void *v, loff_t *ppos)
{
- struct proc_maps_private *priv = m->private;
- struct vm_area_struct *next, *vma = v;
-
- if (vma == priv->tail_vma)
- next = NULL;
- else if (vma->vm_next)
- next = vma->vm_next;
- else
- next = priv->tail_vma;
-
- *ppos = next ? next->vm_start : -1UL;
-
- return next;
+ if (*ppos == -2UL) {
+ *ppos = -1UL;
+ return NULL;
+ }
+ return proc_get_vma(m->private, ppos);
}
static void m_stop(struct seq_file *m, void *v)
@@ -864,7 +867,7 @@ static int show_smap(struct seq_file *m, void *v)
__show_smap(m, &mss, false);
seq_printf(m, "THPeligible: %d\n",
- hugepage_vma_check(vma, vma->vm_flags, true, false));
+ hugepage_vma_check(vma, vma->vm_flags, true, false, true));
if (arch_pkeys_enabled())
seq_printf(m, "ProtectionKey: %8u\n", vma_pkey(vma));
@@ -877,16 +880,16 @@ static int show_smaps_rollup(struct seq_file *m, void *v)
{
struct proc_maps_private *priv = m->private;
struct mem_size_stats mss;
- struct mm_struct *mm;
+ struct mm_struct *mm = priv->mm;
struct vm_area_struct *vma;
- unsigned long last_vma_end = 0;
+ unsigned long vma_start = 0, last_vma_end = 0;
int ret = 0;
+ MA_STATE(mas, &mm->mm_mt, 0, 0);
priv->task = get_proc_task(priv->inode);
if (!priv->task)
return -ESRCH;
- mm = priv->mm;
if (!mm || !mmget_not_zero(mm)) {
ret = -ESRCH;
goto out_put_task;
@@ -899,8 +902,13 @@ static int show_smaps_rollup(struct seq_file *m, void *v)
goto out_put_mm;
hold_task_mempolicy(priv);
+ vma = mas_find(&mas, 0);
+
+ if (unlikely(!vma))
+ goto empty_set;
- for (vma = priv->mm->mmap; vma;) {
+ vma_start = vma->vm_start;
+ do {
smap_gather_stats(vma, &mss, 0);
last_vma_end = vma->vm_end;
@@ -909,6 +917,7 @@ static int show_smaps_rollup(struct seq_file *m, void *v)
* access it for write request.
*/
if (mmap_lock_is_contended(mm)) {
+ mas_pause(&mas);
mmap_read_unlock(mm);
ret = mmap_read_lock_killable(mm);
if (ret) {
@@ -952,7 +961,7 @@ static int show_smaps_rollup(struct seq_file *m, void *v)
* contains last_vma_end.
* Iterate VMA' from last_vma_end.
*/
- vma = find_vma(mm, last_vma_end - 1);
+ vma = mas_find(&mas, ULONG_MAX);
/* Case 3 above */
if (!vma)
break;
@@ -966,11 +975,10 @@ static int show_smaps_rollup(struct seq_file *m, void *v)
smap_gather_stats(vma, &mss, last_vma_end);
}
/* Case 2 above */
- vma = vma->vm_next;
- }
+ } while ((vma = mas_find(&mas, ULONG_MAX)) != NULL);
- show_vma_header_prefix(m, priv->mm->mmap->vm_start,
- last_vma_end, 0, 0, 0, 0);
+empty_set:
+ show_vma_header_prefix(m, vma_start, last_vma_end, 0, 0, 0, 0);
seq_pad(m, ' ');
seq_puts(m, "[rollup]\n");
@@ -1263,6 +1271,7 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf,
return -ESRCH;
mm = get_task_mm(task);
if (mm) {
+ MA_STATE(mas, &mm->mm_mt, 0, 0);
struct mmu_notifier_range range;
struct clear_refs_private cp = {
.type = type,
@@ -1282,7 +1291,7 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf,
}
if (type == CLEAR_REFS_SOFT_DIRTY) {
- for (vma = mm->mmap; vma; vma = vma->vm_next) {
+ mas_for_each(&mas, vma, ULONG_MAX) {
if (!(vma->vm_flags & VM_SOFTDIRTY))
continue;
vma->vm_flags &= ~VM_SOFTDIRTY;
@@ -1294,8 +1303,7 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf,
0, NULL, mm, 0, -1UL);
mmu_notifier_invalidate_range_start(&range);
}
- walk_page_range(mm, 0, mm->highest_vm_end, &clear_refs_walk_ops,
- &cp);
+ walk_page_range(mm, 0, -1, &clear_refs_walk_ops, &cp);
if (type == CLEAR_REFS_SOFT_DIRTY) {
mmu_notifier_invalidate_range_end(&range);
flush_tlb_mm(mm);
@@ -1418,9 +1426,19 @@ static pagemap_entry_t pte_to_pagemap_entry(struct pagemapread *pm,
if (pte_swp_uffd_wp(pte))
flags |= PM_UFFD_WP;
entry = pte_to_swp_entry(pte);
- if (pm->show_pfn)
+ if (pm->show_pfn) {
+ pgoff_t offset;
+ /*
+ * For PFN swap offsets, keeping the offset field
+ * to be PFN only to be compatible with old smaps.
+ */
+ if (is_pfn_swap_entry(entry))
+ offset = swp_offset_pfn(entry);
+ else
+ offset = swp_offset(entry);
frame = swp_type(entry) |
- (swp_offset(entry) << MAX_SWAPFILES_SHIFT);
+ (offset << MAX_SWAPFILES_SHIFT);
+ }
flags |= PM_SWAP;
migration = is_migration_entry(entry);
if (is_pfn_swap_entry(entry))
@@ -1477,7 +1495,11 @@ static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end,
unsigned long offset;
if (pm->show_pfn) {
- offset = swp_offset(entry) +
+ if (is_pfn_swap_entry(entry))
+ offset = swp_offset_pfn(entry);
+ else
+ offset = swp_offset(entry);
+ offset = offset +
((addr & ~PMD_MASK) >> PAGE_SHIFT);
frame = swp_type(entry) |
(offset << MAX_SWAPFILES_SHIFT);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-27 10:50:33 +0000