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-rw-r--r--mm/huge_memory.c112
1 files changed, 70 insertions, 42 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 113e35c4750..83326ad66d9 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -244,24 +244,28 @@ static ssize_t single_flag_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf,
enum transparent_hugepage_flag flag)
{
- if (test_bit(flag, &transparent_hugepage_flags))
- return sprintf(buf, "[yes] no\n");
- else
- return sprintf(buf, "yes [no]\n");
+ return sprintf(buf, "%d\n",
+ !!test_bit(flag, &transparent_hugepage_flags));
}
+
static ssize_t single_flag_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count,
enum transparent_hugepage_flag flag)
{
- if (!memcmp("yes", buf,
- min(sizeof("yes")-1, count))) {
+ unsigned long value;
+ int ret;
+
+ ret = kstrtoul(buf, 10, &value);
+ if (ret < 0)
+ return ret;
+ if (value > 1)
+ return -EINVAL;
+
+ if (value)
set_bit(flag, &transparent_hugepage_flags);
- } else if (!memcmp("no", buf,
- min(sizeof("no")-1, count))) {
+ else
clear_bit(flag, &transparent_hugepage_flags);
- } else
- return -EINVAL;
return count;
}
@@ -643,23 +647,24 @@ static int __do_huge_pmd_anonymous_page(struct mm_struct *mm,
return ret;
}
-static inline gfp_t alloc_hugepage_gfpmask(int defrag)
+static inline gfp_t alloc_hugepage_gfpmask(int defrag, gfp_t extra_gfp)
{
- return GFP_TRANSHUGE & ~(defrag ? 0 : __GFP_WAIT);
+ return (GFP_TRANSHUGE & ~(defrag ? 0 : __GFP_WAIT)) | extra_gfp;
}
static inline struct page *alloc_hugepage_vma(int defrag,
struct vm_area_struct *vma,
- unsigned long haddr, int nd)
+ unsigned long haddr, int nd,
+ gfp_t extra_gfp)
{
- return alloc_pages_vma(alloc_hugepage_gfpmask(defrag),
+ return alloc_pages_vma(alloc_hugepage_gfpmask(defrag, extra_gfp),
HPAGE_PMD_ORDER, vma, haddr, nd);
}
#ifndef CONFIG_NUMA
static inline struct page *alloc_hugepage(int defrag)
{
- return alloc_pages(alloc_hugepage_gfpmask(defrag),
+ return alloc_pages(alloc_hugepage_gfpmask(defrag, 0),
HPAGE_PMD_ORDER);
}
#endif
@@ -678,9 +683,12 @@ int do_huge_pmd_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
if (unlikely(khugepaged_enter(vma)))
return VM_FAULT_OOM;
page = alloc_hugepage_vma(transparent_hugepage_defrag(vma),
- vma, haddr, numa_node_id());
- if (unlikely(!page))
+ vma, haddr, numa_node_id(), 0);
+ if (unlikely(!page)) {
+ count_vm_event(THP_FAULT_FALLBACK);
goto out;
+ }
+ count_vm_event(THP_FAULT_ALLOC);
if (unlikely(mem_cgroup_newpage_charge(page, mm, GFP_KERNEL))) {
put_page(page);
goto out;
@@ -799,7 +807,8 @@ 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_node(GFP_HIGHUSER_MOVABLE,
+ pages[i] = alloc_page_vma_node(GFP_HIGHUSER_MOVABLE |
+ __GFP_OTHER_NODE,
vma, address, page_to_nid(page));
if (unlikely(!pages[i] ||
mem_cgroup_newpage_charge(pages[i], mm,
@@ -902,16 +911,18 @@ int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
if (transparent_hugepage_enabled(vma) &&
!transparent_hugepage_debug_cow())
new_page = alloc_hugepage_vma(transparent_hugepage_defrag(vma),
- vma, haddr, numa_node_id());
+ vma, haddr, numa_node_id(), 0);
else
new_page = NULL;
if (unlikely(!new_page)) {
+ count_vm_event(THP_FAULT_FALLBACK);
ret = do_huge_pmd_wp_page_fallback(mm, vma, address,
pmd, orig_pmd, page, haddr);
put_page(page);
goto out;
}
+ count_vm_event(THP_FAULT_ALLOC);
if (unlikely(mem_cgroup_newpage_charge(new_page, mm, GFP_KERNEL))) {
put_page(new_page);
@@ -1388,6 +1399,7 @@ int split_huge_page(struct page *page)
BUG_ON(!PageSwapBacked(page));
__split_huge_page(page, anon_vma);
+ count_vm_event(THP_SPLIT);
BUG_ON(PageCompound(page));
out_unlock:
@@ -1396,6 +1408,9 @@ out:
return ret;
}
+#define VM_NO_THP (VM_SPECIAL|VM_INSERTPAGE|VM_MIXEDMAP|VM_SAO| \
+ VM_HUGETLB|VM_SHARED|VM_MAYSHARE)
+
int hugepage_madvise(struct vm_area_struct *vma,
unsigned long *vm_flags, int advice)
{
@@ -1404,11 +1419,7 @@ int hugepage_madvise(struct vm_area_struct *vma,
/*
* Be somewhat over-protective like KSM for now!
*/
- if (*vm_flags & (VM_HUGEPAGE |
- VM_SHARED | VM_MAYSHARE |
- VM_PFNMAP | VM_IO | VM_DONTEXPAND |
- VM_RESERVED | VM_HUGETLB | VM_INSERTPAGE |
- VM_MIXEDMAP | VM_SAO))
+ if (*vm_flags & (VM_HUGEPAGE | VM_NO_THP))
return -EINVAL;
*vm_flags &= ~VM_NOHUGEPAGE;
*vm_flags |= VM_HUGEPAGE;
@@ -1424,11 +1435,7 @@ int hugepage_madvise(struct vm_area_struct *vma,
/*
* Be somewhat over-protective like KSM for now!
*/
- if (*vm_flags & (VM_NOHUGEPAGE |
- VM_SHARED | VM_MAYSHARE |
- VM_PFNMAP | VM_IO | VM_DONTEXPAND |
- VM_RESERVED | VM_HUGETLB | VM_INSERTPAGE |
- VM_MIXEDMAP | VM_SAO))
+ if (*vm_flags & (VM_NOHUGEPAGE | VM_NO_THP))
return -EINVAL;
*vm_flags &= ~VM_HUGEPAGE;
*vm_flags |= VM_NOHUGEPAGE;
@@ -1562,10 +1569,14 @@ int khugepaged_enter_vma_merge(struct vm_area_struct *vma)
* page fault if needed.
*/
return 0;
- if (vma->vm_file || vma->vm_ops)
+ if (vma->vm_ops)
/* khugepaged not yet working on file or special mappings */
return 0;
- VM_BUG_ON(is_linear_pfn_mapping(vma) || is_pfn_mapping(vma));
+ /*
+ * If is_pfn_mapping() is true is_learn_pfn_mapping() must be
+ * true too, verify it here.
+ */
+ VM_BUG_ON(is_linear_pfn_mapping(vma) || vma->vm_flags & VM_NO_THP);
hstart = (vma->vm_start + ~HPAGE_PMD_MASK) & HPAGE_PMD_MASK;
hend = vma->vm_end & HPAGE_PMD_MASK;
if (hstart < hend)
@@ -1779,12 +1790,14 @@ static void collapse_huge_page(struct mm_struct *mm,
* scalability.
*/
new_page = alloc_hugepage_vma(khugepaged_defrag(), vma, address,
- node);
+ node, __GFP_OTHER_NODE);
if (unlikely(!new_page)) {
up_read(&mm->mmap_sem);
+ count_vm_event(THP_COLLAPSE_ALLOC_FAILED);
*hpage = ERR_PTR(-ENOMEM);
return;
}
+ count_vm_event(THP_COLLAPSE_ALLOC);
if (unlikely(mem_cgroup_newpage_charge(new_page, mm, GFP_KERNEL))) {
up_read(&mm->mmap_sem);
put_page(new_page);
@@ -1814,12 +1827,15 @@ static void collapse_huge_page(struct mm_struct *mm,
(vma->vm_flags & VM_NOHUGEPAGE))
goto out;
- /* VM_PFNMAP vmas may have vm_ops null but vm_file set */
- if (!vma->anon_vma || vma->vm_ops || vma->vm_file)
+ if (!vma->anon_vma || vma->vm_ops)
goto out;
if (is_vma_temporary_stack(vma))
goto out;
- VM_BUG_ON(is_linear_pfn_mapping(vma) || is_pfn_mapping(vma));
+ /*
+ * If is_pfn_mapping() is true is_learn_pfn_mapping() must be
+ * true too, verify it here.
+ */
+ VM_BUG_ON(is_linear_pfn_mapping(vma) || vma->vm_flags & VM_NO_THP);
pgd = pgd_offset(mm, address);
if (!pgd_present(*pgd))
@@ -2052,13 +2068,16 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages,
progress++;
continue;
}
- /* VM_PFNMAP vmas may have vm_ops null but vm_file set */
- if (!vma->anon_vma || vma->vm_ops || vma->vm_file)
+ if (!vma->anon_vma || vma->vm_ops)
goto skip;
if (is_vma_temporary_stack(vma))
goto skip;
-
- VM_BUG_ON(is_linear_pfn_mapping(vma) || is_pfn_mapping(vma));
+ /*
+ * If is_pfn_mapping() is true is_learn_pfn_mapping()
+ * must be true too, verify it here.
+ */
+ VM_BUG_ON(is_linear_pfn_mapping(vma) ||
+ vma->vm_flags & VM_NO_THP);
hstart = (vma->vm_start + ~HPAGE_PMD_MASK) & HPAGE_PMD_MASK;
hend = vma->vm_end & HPAGE_PMD_MASK;
@@ -2149,8 +2168,11 @@ static void khugepaged_do_scan(struct page **hpage)
#ifndef CONFIG_NUMA
if (!*hpage) {
*hpage = alloc_hugepage(khugepaged_defrag());
- if (unlikely(!*hpage))
+ if (unlikely(!*hpage)) {
+ count_vm_event(THP_COLLAPSE_ALLOC_FAILED);
break;
+ }
+ count_vm_event(THP_COLLAPSE_ALLOC);
}
#else
if (IS_ERR(*hpage))
@@ -2190,8 +2212,11 @@ static struct page *khugepaged_alloc_hugepage(void)
do {
hpage = alloc_hugepage(khugepaged_defrag());
- if (!hpage)
+ if (!hpage) {
+ count_vm_event(THP_COLLAPSE_ALLOC_FAILED);
khugepaged_alloc_sleep();
+ } else
+ count_vm_event(THP_COLLAPSE_ALLOC);
} while (unlikely(!hpage) &&
likely(khugepaged_enabled()));
return hpage;
@@ -2208,8 +2233,11 @@ static void khugepaged_loop(void)
while (likely(khugepaged_enabled())) {
#ifndef CONFIG_NUMA
hpage = khugepaged_alloc_hugepage();
- if (unlikely(!hpage))
+ if (unlikely(!hpage)) {
+ count_vm_event(THP_COLLAPSE_ALLOC_FAILED);
break;
+ }
+ count_vm_event(THP_COLLAPSE_ALLOC);
#else
if (IS_ERR(hpage)) {
khugepaged_alloc_sleep();
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-27 07:08:35 +0000