thp: memcg huge memory

Add memcg charge/uncharge to hugepage faults in huge_memory.c.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 31 insertions, 5 deletions

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 620891f4e54f..a313403b3c5e 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -233,6 +233,7 @@ static int __do_huge_pmd_anonymous_page(struct mm_struct *mm,
         VM_BUG_ON(!PageCompound(page));
         pgtable = pte_alloc_one(mm, haddr);
         if (unlikely(!pgtable)) {
+                mem_cgroup_uncharge_page(page);
                 put_page(page);
                 return VM_FAULT_OOM;
         }
@@ -243,6 +244,7 @@ static int __do_huge_pmd_anonymous_page(struct mm_struct *mm,
         spin_lock(&mm->page_table_lock);
         if (unlikely(!pmd_none(*pmd))) {
                 spin_unlock(&mm->page_table_lock);
+                mem_cgroup_uncharge_page(page);
                 put_page(page);
                 pte_free(mm, pgtable);
         } else {
@@ -286,6 +288,10 @@ int do_huge_pmd_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
                 page = alloc_hugepage(transparent_hugepage_defrag(vma));
                 if (unlikely(!page))
                         goto out;
+                if (unlikely(mem_cgroup_newpage_charge(page, mm, GFP_KERNEL))) {
+                        put_page(page);
+                        goto out;
+                }
 
                 return __do_huge_pmd_anonymous_page(mm, vma, haddr, pmd, page);
         }
@@ -402,9 +408,17 @@ static int do_huge_pmd_wp_page_fallback(struct mm_struct *mm,
         for (i = 0; i < HPAGE_PMD_NR; i++) {
                 pages[i] = alloc_page_vma(GFP_HIGHUSER_MOVABLE,
                                           vma, address);
-                if (unlikely(!pages[i])) {
-                        while (--i >= 0)
+                if (unlikely(!pages[i] ||
+                             mem_cgroup_newpage_charge(pages[i], mm,
+                                                       GFP_KERNEL))) {
+                        if (pages[i])
                                 put_page(pages[i]);
+                        mem_cgroup_uncharge_start();
+                        while (--i >= 0) {
+                                mem_cgroup_uncharge_page(pages[i]);
+                                put_page(pages[i]);
+                        }
+                        mem_cgroup_uncharge_end();
                         kfree(pages);
                         ret |= VM_FAULT_OOM;
                         goto out;
@@ -455,8 +469,12 @@ out:
 
 out_free_pages:
         spin_unlock(&mm->page_table_lock);
-        for (i = 0; i < HPAGE_PMD_NR; i++)
+        mem_cgroup_uncharge_start();
+        for (i = 0; i < HPAGE_PMD_NR; i++) {
+                mem_cgroup_uncharge_page(pages[i]);
                 put_page(pages[i]);
+        }
+        mem_cgroup_uncharge_end();
         kfree(pages);
         goto out;
 }
@@ -501,14 +519,22 @@ int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
                 goto out;
         }
 
+        if (unlikely(mem_cgroup_newpage_charge(new_page, mm, GFP_KERNEL))) {
+                put_page(new_page);
+                put_page(page);
+                ret |= VM_FAULT_OOM;
+                goto out;
+        }
+
         copy_user_huge_page(new_page, page, haddr, vma, HPAGE_PMD_NR);
         __SetPageUptodate(new_page);
 
         spin_lock(&mm->page_table_lock);
         put_page(page);
-        if (unlikely(!pmd_same(*pmd, orig_pmd)))
+        if (unlikely(!pmd_same(*pmd, orig_pmd))) {
+                mem_cgroup_uncharge_page(new_page);
                 put_page(new_page);
-        else {
+        } else {
                 pmd_t entry;
                 VM_BUG_ON(!PageHead(page));
                 entry = mk_pmd(new_page, vma->vm_page_prot);