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-rw-r--r--mm/mempolicy.c147
1 files changed, 99 insertions, 48 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index d911fa5cb2a7..006ba625c0b8 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -97,6 +97,7 @@
#include <linux/mm_inline.h>
#include <linux/mmu_notifier.h>
#include <linux/printk.h>
+#include <linux/swapops.h>
#include <asm/tlbflush.h>
#include <linux/uaccess.h>
@@ -412,6 +413,64 @@ struct queue_pages {
};
/*
+ * Check if the page's nid is in qp->nmask.
+ *
+ * If MPOL_MF_INVERT is set in qp->flags, check if the nid is
+ * in the invert of qp->nmask.
+ */
+static inline bool queue_pages_required(struct page *page,
+ struct queue_pages *qp)
+{
+ int nid = page_to_nid(page);
+ unsigned long flags = qp->flags;
+
+ return node_isset(nid, *qp->nmask) == !(flags & MPOL_MF_INVERT);
+}
+
+static int queue_pages_pmd(pmd_t *pmd, spinlock_t *ptl, unsigned long addr,
+ unsigned long end, struct mm_walk *walk)
+{
+ int ret = 0;
+ struct page *page;
+ struct queue_pages *qp = walk->private;
+ unsigned long flags;
+
+ if (unlikely(is_pmd_migration_entry(*pmd))) {
+ ret = 1;
+ goto unlock;
+ }
+ page = pmd_page(*pmd);
+ if (is_huge_zero_page(page)) {
+ spin_unlock(ptl);
+ __split_huge_pmd(walk->vma, pmd, addr, false, NULL);
+ goto out;
+ }
+ if (!thp_migration_supported()) {
+ get_page(page);
+ spin_unlock(ptl);
+ lock_page(page);
+ ret = split_huge_page(page);
+ unlock_page(page);
+ put_page(page);
+ goto out;
+ }
+ if (!queue_pages_required(page, qp)) {
+ ret = 1;
+ goto unlock;
+ }
+
+ ret = 1;
+ flags = qp->flags;
+ /* go to thp migration */
+ if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL))
+ migrate_page_add(page, qp->pagelist, flags);
+unlock:
+ spin_unlock(ptl);
+out:
+ return ret;
+}
+
+/*
* Scan through pages checking if pages follow certain conditions,
* and move them to the pagelist if they do.
*/
@@ -422,30 +481,15 @@ static int queue_pages_pte_range(pmd_t *pmd, unsigned long addr,
struct page *page;
struct queue_pages *qp = walk->private;
unsigned long flags = qp->flags;
- int nid, ret;
+ int ret;
pte_t *pte;
spinlock_t *ptl;
- if (pmd_trans_huge(*pmd)) {
- ptl = pmd_lock(walk->mm, pmd);
- if (pmd_trans_huge(*pmd)) {
- page = pmd_page(*pmd);
- if (is_huge_zero_page(page)) {
- spin_unlock(ptl);
- __split_huge_pmd(vma, pmd, addr, false, NULL);
- } else {
- get_page(page);
- spin_unlock(ptl);
- lock_page(page);
- ret = split_huge_page(page);
- unlock_page(page);
- put_page(page);
- if (ret)
- return 0;
- }
- } else {
- spin_unlock(ptl);
- }
+ ptl = pmd_trans_huge_lock(pmd, vma);
+ if (ptl) {
+ ret = queue_pages_pmd(pmd, ptl, addr, end, walk);
+ if (ret)
+ return 0;
}
if (pmd_trans_unstable(pmd))
@@ -464,10 +508,9 @@ retry:
*/
if (PageReserved(page))
continue;
- nid = page_to_nid(page);
- if (node_isset(nid, *qp->nmask) == !!(flags & MPOL_MF_INVERT))
+ if (!queue_pages_required(page, qp))
continue;
- if (PageTransCompound(page)) {
+ if (PageTransCompound(page) && !thp_migration_supported()) {
get_page(page);
pte_unmap_unlock(pte, ptl);
lock_page(page);
@@ -497,7 +540,6 @@ static int queue_pages_hugetlb(pte_t *pte, unsigned long hmask,
#ifdef CONFIG_HUGETLB_PAGE
struct queue_pages *qp = walk->private;
unsigned long flags = qp->flags;
- int nid;
struct page *page;
spinlock_t *ptl;
pte_t entry;
@@ -507,8 +549,7 @@ static int queue_pages_hugetlb(pte_t *pte, unsigned long hmask,
if (!pte_present(entry))
goto unlock;
page = pte_page(entry);
- nid = page_to_nid(page);
- if (node_isset(nid, *qp->nmask) == !!(flags & MPOL_MF_INVERT))
+ if (!queue_pages_required(page, qp))
goto unlock;
/* With MPOL_MF_MOVE, we migrate only unshared hugepage. */
if (flags & (MPOL_MF_MOVE_ALL) ||
@@ -861,11 +902,6 @@ static long do_get_mempolicy(int *policy, nodemask_t *nmask,
*policy |= (pol->flags & MPOL_MODE_FLAGS);
}
- if (vma) {
- up_read(&current->mm->mmap_sem);
- vma = NULL;
- }
-
err = 0;
if (nmask) {
if (mpol_store_user_nodemask(pol)) {
@@ -886,19 +922,21 @@ static long do_get_mempolicy(int *policy, nodemask_t *nmask,
#ifdef CONFIG_MIGRATION
/*
- * page migration
+ * page migration, thp tail pages can be passed.
*/
static void migrate_page_add(struct page *page, struct list_head *pagelist,
unsigned long flags)
{
+ struct page *head = compound_head(page);
/*
* Avoid migrating a page that is shared with others.
*/
- if ((flags & MPOL_MF_MOVE_ALL) || page_mapcount(page) == 1) {
- if (!isolate_lru_page(page)) {
- list_add_tail(&page->lru, pagelist);
- inc_node_page_state(page, NR_ISOLATED_ANON +
- page_is_file_cache(page));
+ if ((flags & MPOL_MF_MOVE_ALL) || page_mapcount(head) == 1) {
+ if (!isolate_lru_page(head)) {
+ list_add_tail(&head->lru, pagelist);
+ mod_node_page_state(page_pgdat(head),
+ NR_ISOLATED_ANON + page_is_file_cache(head),
+ hpage_nr_pages(head));
}
}
}
@@ -908,7 +946,17 @@ static struct page *new_node_page(struct page *page, unsigned long node, int **x
if (PageHuge(page))
return alloc_huge_page_node(page_hstate(compound_head(page)),
node);
- else
+ else if (thp_migration_supported() && PageTransHuge(page)) {
+ struct page *thp;
+
+ thp = alloc_pages_node(node,
+ (GFP_TRANSHUGE | __GFP_THISNODE),
+ HPAGE_PMD_ORDER);
+ if (!thp)
+ return NULL;
+ prep_transhuge_page(thp);
+ return thp;
+ } else
return __alloc_pages_node(node, GFP_HIGHUSER_MOVABLE |
__GFP_THISNODE, 0);
}
@@ -1074,6 +1122,15 @@ static struct page *new_page(struct page *page, unsigned long start, int **x)
if (PageHuge(page)) {
BUG_ON(!vma);
return alloc_huge_page_noerr(vma, address, 1);
+ } else if (thp_migration_supported() && PageTransHuge(page)) {
+ struct page *thp;
+
+ thp = alloc_hugepage_vma(GFP_TRANSHUGE, vma, address,
+ HPAGE_PMD_ORDER);
+ if (!thp)
+ return NULL;
+ prep_transhuge_page(thp);
+ return thp;
}
/*
* if !vma, alloc_page_vma() will use task or system default policy
@@ -1688,8 +1745,7 @@ unsigned int mempolicy_slab_node(void)
* node in pol->v.nodes (starting from n=0), wrapping around if n exceeds the
* number of present nodes.
*/
-static unsigned offset_il_node(struct mempolicy *pol,
- struct vm_area_struct *vma, unsigned long n)
+static unsigned offset_il_node(struct mempolicy *pol, unsigned long n)
{
unsigned nnodes = nodes_weight(pol->v.nodes);
unsigned target;
@@ -1722,7 +1778,7 @@ static inline unsigned interleave_nid(struct mempolicy *pol,
BUG_ON(shift < PAGE_SHIFT);
off = vma->vm_pgoff >> (shift - PAGE_SHIFT);
off += (addr - vma->vm_start) >> shift;
- return offset_il_node(pol, vma, off);
+ return offset_il_node(pol, off);
} else
return interleave_nodes(pol);
}
@@ -2177,20 +2233,15 @@ int mpol_misplaced(struct page *page, struct vm_area_struct *vma, unsigned long
int polnid = -1;
int ret = -1;
- BUG_ON(!vma);
-
pol = get_vma_policy(vma, addr);
if (!(pol->flags & MPOL_F_MOF))
goto out;
switch (pol->mode) {
case MPOL_INTERLEAVE:
- BUG_ON(addr >= vma->vm_end);
- BUG_ON(addr < vma->vm_start);
-
pgoff = vma->vm_pgoff;
pgoff += (addr - vma->vm_start) >> PAGE_SHIFT;
- polnid = offset_il_node(pol, vma, pgoff);
+ polnid = offset_il_node(pol, pgoff);
break;
case MPOL_PREFERRED:
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.