diff options
Diffstat (limited to '')
| -rw-r--r-- | include/linux/migrate.h | 4 | ||||
| -rw-r--r-- | mm/huge_memory.c | 6 | ||||
| -rw-r--r-- | mm/memory_hotplug.c | 2 | ||||
| -rw-r--r-- | mm/mempolicy.c | 31 | ||||
| -rw-r--r-- | mm/migrate.c | 34 |
5 files changed, 36 insertions, 41 deletions
diff --git a/include/linux/migrate.h b/include/linux/migrate.h index e0393240bf64..f2b4abbca55e 100644 --- a/include/linux/migrate.h +++ b/include/linux/migrate.h @@ -42,9 +42,9 @@ static inline struct page *new_page_nodemask(struct page *page, return alloc_huge_page_nodemask(page_hstate(compound_head(page)), preferred_nid, nodemask); - if (thp_migration_supported() && PageTransHuge(page)) { - order = HPAGE_PMD_ORDER; + if (PageTransHuge(page)) { gfp_mask |= GFP_TRANSHUGE; + order = HPAGE_PMD_ORDER; } if (PageHighMem(page) || (zone_idx(page_zone(page)) == ZONE_MOVABLE)) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 229ab8c75a6b..3f3267af4e3b 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -2401,6 +2401,12 @@ static void __split_huge_page_tail(struct page *head, int tail, page_tail->index = head->index + tail; page_cpupid_xchg_last(page_tail, page_cpupid_last(head)); + + /* + * always add to the tail because some iterators expect new + * pages to show after the currently processed elements - e.g. + * migrate_pages + */ lru_add_page_tail(head, page_tail, lruvec, list); } diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index ec028494519c..f74826cdceea 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1372,7 +1372,7 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) if (isolate_huge_page(page, &source)) move_pages -= 1 << compound_order(head); continue; - } else if (thp_migration_supported() && PageTransHuge(page)) + } else if (PageTransHuge(page)) pfn = page_to_pfn(compound_head(page)) + hpage_nr_pages(page) - 1; diff --git a/mm/mempolicy.c b/mm/mempolicy.c index e94bd70840de..9ac49ef17b4e 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -446,15 +446,6 @@ static int queue_pages_pmd(pmd_t *pmd, spinlock_t *ptl, unsigned long addr, __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; @@ -495,7 +486,7 @@ static int queue_pages_pte_range(pmd_t *pmd, unsigned long addr, if (pmd_trans_unstable(pmd)) return 0; -retry: + pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl); for (; addr != end; pte++, addr += PAGE_SIZE) { if (!pte_present(*pte)) @@ -511,22 +502,6 @@ retry: continue; if (!queue_pages_required(page, qp)) continue; - if (PageTransCompound(page) && !thp_migration_supported()) { - get_page(page); - pte_unmap_unlock(pte, ptl); - lock_page(page); - ret = split_huge_page(page); - unlock_page(page); - put_page(page); - /* Failed to split -- skip. */ - if (ret) { - pte = pte_offset_map_lock(walk->mm, pmd, - addr, &ptl); - continue; - } - goto retry; - } - migrate_page_add(page, qp->pagelist, flags); } pte_unmap_unlock(pte - 1, ptl); @@ -948,7 +923,7 @@ struct page *alloc_new_node_page(struct page *page, unsigned long node) if (PageHuge(page)) return alloc_huge_page_node(page_hstate(compound_head(page)), node); - else if (thp_migration_supported() && PageTransHuge(page)) { + else if (PageTransHuge(page)) { struct page *thp; thp = alloc_pages_node(node, @@ -1124,7 +1099,7 @@ static struct page *new_page(struct page *page, unsigned long start) if (PageHuge(page)) { return alloc_huge_page_vma(page_hstate(compound_head(page)), vma, address); - } else if (thp_migration_supported() && PageTransHuge(page)) { + } else if (PageTransHuge(page)) { struct page *thp; thp = alloc_hugepage_vma(GFP_TRANSHUGE, vma, address, diff --git a/mm/migrate.c b/mm/migrate.c index c606752f6d2a..51b55f2d2db5 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -1139,6 +1139,9 @@ static ICE_noinline int unmap_and_move(new_page_t get_new_page, int rc = MIGRATEPAGE_SUCCESS; struct page *newpage; + if (!thp_migration_supported() && PageTransHuge(page)) + return -ENOMEM; + newpage = get_new_page(page, private); if (!newpage) return -ENOMEM; @@ -1160,14 +1163,6 @@ static ICE_noinline int unmap_and_move(new_page_t get_new_page, goto out; } - if (unlikely(PageTransHuge(page) && !PageTransHuge(newpage))) { - lock_page(page); - rc = split_huge_page(page); - unlock_page(page); - if (rc) - goto out; - } - rc = __unmap_and_move(page, newpage, force, mode); if (rc == MIGRATEPAGE_SUCCESS) set_page_owner_migrate_reason(newpage, reason); @@ -1381,6 +1376,7 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page, retry = 0; list_for_each_entry_safe(page, page2, from, lru) { +retry: cond_resched(); if (PageHuge(page)) @@ -1394,6 +1390,26 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page, switch(rc) { case -ENOMEM: + /* + * THP migration might be unsupported or the + * allocation could've failed so we should + * retry on the same page with the THP split + * to base pages. + * + * Head page is retried immediately and tail + * pages are added to the tail of the list so + * we encounter them after the rest of the list + * is processed. + */ + if (PageTransHuge(page)) { + lock_page(page); + rc = split_huge_page_to_list(page, from); + unlock_page(page); + if (!rc) { + list_safe_reset_next(page, page2, lru); + goto retry; + } + } nr_failed++; goto out; case -EAGAIN: @@ -1480,8 +1496,6 @@ static int add_page_for_migration(struct mm_struct *mm, unsigned long addr, /* FOLL_DUMP to ignore special (like zero) pages */ follflags = FOLL_GET | FOLL_DUMP; - if (!thp_migration_supported()) - follflags |= FOLL_SPLIT; page = follow_page(vma, addr, follflags); err = PTR_ERR(page); |