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-rw-r--r--mm/migrate.c177
1 files changed, 33 insertions, 144 deletions
diff --git a/mm/migrate.c b/mm/migrate.c
index 9bd6bc12aa72..b7e330900b86 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2048,6 +2048,23 @@ static struct page *alloc_misplaced_dst_page(struct page *page,
return newpage;
}
+static struct page *alloc_misplaced_dst_page_thp(struct page *page,
+ unsigned long data)
+{
+ int nid = (int) data;
+ struct page *newpage;
+
+ newpage = alloc_pages_node(nid, (GFP_TRANSHUGE_LIGHT | __GFP_THISNODE),
+ HPAGE_PMD_ORDER);
+ if (!newpage)
+ goto out;
+
+ prep_transhuge_page(newpage);
+
+out:
+ return newpage;
+}
+
static int numamigrate_isolate_page(pg_data_t *pgdat, struct page *page)
{
int page_lru;
@@ -2086,12 +2103,6 @@ static int numamigrate_isolate_page(pg_data_t *pgdat, struct page *page)
return 1;
}
-bool pmd_trans_migrating(pmd_t pmd)
-{
- struct page *page = pmd_page(pmd);
- return PageLocked(page);
-}
-
/*
* Attempt to migrate a misplaced page to the specified destination
* node. Caller is expected to have an elevated reference count on
@@ -2104,6 +2115,20 @@ int migrate_misplaced_page(struct page *page, struct vm_area_struct *vma,
int isolated;
int nr_remaining;
LIST_HEAD(migratepages);
+ new_page_t *new;
+ bool compound;
+
+ /*
+ * PTE mapped THP or HugeTLB page can't reach here so the page could
+ * be either base page or THP. And it must be head page if it is
+ * THP.
+ */
+ compound = PageTransHuge(page);
+
+ if (compound)
+ new = alloc_misplaced_dst_page_thp;
+ else
+ new = alloc_misplaced_dst_page;
/*
* Don't migrate file pages that are mapped in multiple processes
@@ -2125,9 +2150,8 @@ int migrate_misplaced_page(struct page *page, struct vm_area_struct *vma,
goto out;
list_add(&page->lru, &migratepages);
- nr_remaining = migrate_pages(&migratepages, alloc_misplaced_dst_page,
- NULL, node, MIGRATE_ASYNC,
- MR_NUMA_MISPLACED);
+ nr_remaining = migrate_pages(&migratepages, *new, NULL, node,
+ MIGRATE_ASYNC, MR_NUMA_MISPLACED);
if (nr_remaining) {
if (!list_empty(&migratepages)) {
list_del(&page->lru);
@@ -2146,141 +2170,6 @@ out:
return 0;
}
#endif /* CONFIG_NUMA_BALANCING */
-
-#if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
-/*
- * Migrates a THP to a given target node. page must be locked and is unlocked
- * before returning.
- */
-int migrate_misplaced_transhuge_page(struct mm_struct *mm,
- struct vm_area_struct *vma,
- pmd_t *pmd, pmd_t entry,
- unsigned long address,
- struct page *page, int node)
-{
- spinlock_t *ptl;
- pg_data_t *pgdat = NODE_DATA(node);
- int isolated = 0;
- struct page *new_page = NULL;
- int page_lru = page_is_file_lru(page);
- unsigned long start = address & HPAGE_PMD_MASK;
-
- new_page = alloc_pages_node(node,
- (GFP_TRANSHUGE_LIGHT | __GFP_THISNODE),
- HPAGE_PMD_ORDER);
- if (!new_page)
- goto out_fail;
- prep_transhuge_page(new_page);
-
- isolated = numamigrate_isolate_page(pgdat, page);
- if (!isolated) {
- put_page(new_page);
- goto out_fail;
- }
-
- /* Prepare a page as a migration target */
- __SetPageLocked(new_page);
- if (PageSwapBacked(page))
- __SetPageSwapBacked(new_page);
-
- /* anon mapping, we can simply copy page->mapping to the new page: */
- new_page->mapping = page->mapping;
- new_page->index = page->index;
- /* flush the cache before copying using the kernel virtual address */
- flush_cache_range(vma, start, start + HPAGE_PMD_SIZE);
- migrate_page_copy(new_page, page);
- WARN_ON(PageLRU(new_page));
-
- /* Recheck the target PMD */
- ptl = pmd_lock(mm, pmd);
- if (unlikely(!pmd_same(*pmd, entry) || !page_ref_freeze(page, 2))) {
- spin_unlock(ptl);
-
- /* Reverse changes made by migrate_page_copy() */
- if (TestClearPageActive(new_page))
- SetPageActive(page);
- if (TestClearPageUnevictable(new_page))
- SetPageUnevictable(page);
-
- unlock_page(new_page);
- put_page(new_page); /* Free it */
-
- /* Retake the callers reference and putback on LRU */
- get_page(page);
- putback_lru_page(page);
- mod_node_page_state(page_pgdat(page),
- NR_ISOLATED_ANON + page_lru, -HPAGE_PMD_NR);
-
- goto out_unlock;
- }
-
- entry = mk_huge_pmd(new_page, vma->vm_page_prot);
- entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma);
-
- /*
- * Overwrite the old entry under pagetable lock and establish
- * the new PTE. Any parallel GUP will either observe the old
- * page blocking on the page lock, block on the page table
- * lock or observe the new page. The SetPageUptodate on the
- * new page and page_add_new_anon_rmap guarantee the copy is
- * visible before the pagetable update.
- */
- page_add_anon_rmap(new_page, vma, start, true);
- /*
- * At this point the pmd is numa/protnone (i.e. non present) and the TLB
- * has already been flushed globally. So no TLB can be currently
- * caching this non present pmd mapping. There's no need to clear the
- * pmd before doing set_pmd_at(), nor to flush the TLB after
- * set_pmd_at(). Clearing the pmd here would introduce a race
- * condition against MADV_DONTNEED, because MADV_DONTNEED only holds the
- * mmap_lock for reading. If the pmd is set to NULL at any given time,
- * MADV_DONTNEED won't wait on the pmd lock and it'll skip clearing this
- * pmd.
- */
- set_pmd_at(mm, start, pmd, entry);
- update_mmu_cache_pmd(vma, address, &entry);
-
- page_ref_unfreeze(page, 2);
- mlock_migrate_page(new_page, page);
- page_remove_rmap(page, true);
- set_page_owner_migrate_reason(new_page, MR_NUMA_MISPLACED);
-
- spin_unlock(ptl);
-
- /* Take an "isolate" reference and put new page on the LRU. */
- get_page(new_page);
- putback_lru_page(new_page);
-
- unlock_page(new_page);
- unlock_page(page);
- put_page(page); /* Drop the rmap reference */
- put_page(page); /* Drop the LRU isolation reference */
-
- count_vm_events(PGMIGRATE_SUCCESS, HPAGE_PMD_NR);
- count_vm_numa_events(NUMA_PAGE_MIGRATE, HPAGE_PMD_NR);
-
- mod_node_page_state(page_pgdat(page),
- NR_ISOLATED_ANON + page_lru,
- -HPAGE_PMD_NR);
- return isolated;
-
-out_fail:
- count_vm_events(PGMIGRATE_FAIL, HPAGE_PMD_NR);
- ptl = pmd_lock(mm, pmd);
- if (pmd_same(*pmd, entry)) {
- entry = pmd_modify(entry, vma->vm_page_prot);
- set_pmd_at(mm, start, pmd, entry);
- update_mmu_cache_pmd(vma, address, &entry);
- }
- spin_unlock(ptl);
-
-out_unlock:
- unlock_page(page);
- put_page(page);
- return 0;
-}
-#endif /* CONFIG_NUMA_BALANCING */
-
#endif /* CONFIG_NUMA */
#ifdef CONFIG_DEVICE_PRIVATE
generated by cgit v1.2.3-58-ga151 (git 2.39.0) at 2024-12-14 04:39:06 +0000