diff options
author | Jiri Kosina <jkosina@suse.cz> | 2014-11-20 16:42:02 +0300 |
---|---|---|
committer | Jiri Kosina <jkosina@suse.cz> | 2014-11-20 16:42:02 +0300 |
commit | a02001086bbfb4da35d1228bebc2f1b442db455f (patch) | |
tree | 62ab47936cef06fd08657ca5b6cd1df98c19be57 /mm/migrate.c | |
parent | eff264efeeb0898408e8c9df72d8a32621035bed (diff) | |
parent | fc14f9c1272f62c3e8d01300f52467c0d9af50f9 (diff) |
Merge Linus' tree to be be to apply submitted patches to newer code than
current trivial.git base
Diffstat (limited to 'mm/migrate.c')
-rw-r--r-- | mm/migrate.c | 59 |
1 files changed, 17 insertions, 42 deletions
diff --git a/mm/migrate.c b/mm/migrate.c index be6dbf995c0c..01439953abf5 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -146,8 +146,11 @@ static int remove_migration_pte(struct page *new, struct vm_area_struct *vma, pte = pte_mkold(mk_pte(new, vma->vm_page_prot)); if (pte_swp_soft_dirty(*ptep)) pte = pte_mksoft_dirty(pte); + + /* Recheck VMA as permissions can change since migration started */ if (is_write_migration_entry(entry)) - pte = pte_mkwrite(pte); + pte = maybe_mkwrite(pte, vma); + #ifdef CONFIG_HUGETLB_PAGE if (PageHuge(new)) { pte = pte_mkhuge(pte); @@ -780,6 +783,7 @@ static int move_to_new_page(struct page *newpage, struct page *page, if (rc != MIGRATEPAGE_SUCCESS) { newpage->mapping = NULL; } else { + mem_cgroup_migrate(page, newpage, false); if (remap_swapcache) remove_migration_ptes(page, newpage); page->mapping = NULL; @@ -795,7 +799,6 @@ static int __unmap_and_move(struct page *page, struct page *newpage, { int rc = -EAGAIN; int remap_swapcache = 1; - struct mem_cgroup *mem; struct anon_vma *anon_vma = NULL; if (!trylock_page(page)) { @@ -821,9 +824,6 @@ static int __unmap_and_move(struct page *page, struct page *newpage, lock_page(page); } - /* charge against new page */ - mem_cgroup_prepare_migration(page, newpage, &mem); - if (PageWriteback(page)) { /* * Only in the case of a full synchronous migration is it @@ -833,10 +833,10 @@ static int __unmap_and_move(struct page *page, struct page *newpage, */ if (mode != MIGRATE_SYNC) { rc = -EBUSY; - goto uncharge; + goto out_unlock; } if (!force) - goto uncharge; + goto out_unlock; wait_on_page_writeback(page); } /* @@ -872,11 +872,11 @@ static int __unmap_and_move(struct page *page, struct page *newpage, */ remap_swapcache = 0; } else { - goto uncharge; + goto out_unlock; } } - if (unlikely(balloon_page_movable(page))) { + if (unlikely(isolated_balloon_page(page))) { /* * A ballooned page does not need any special attention from * physical to virtual reverse mapping procedures. @@ -885,7 +885,7 @@ static int __unmap_and_move(struct page *page, struct page *newpage, * the page migration right away (proteced by page lock). */ rc = balloon_page_migrate(newpage, page, mode); - goto uncharge; + goto out_unlock; } /* @@ -904,7 +904,7 @@ static int __unmap_and_move(struct page *page, struct page *newpage, VM_BUG_ON_PAGE(PageAnon(page), page); if (page_has_private(page)) { try_to_free_buffers(page); - goto uncharge; + goto out_unlock; } goto skip_unmap; } @@ -923,10 +923,7 @@ skip_unmap: if (anon_vma) put_anon_vma(anon_vma); -uncharge: - mem_cgroup_end_migration(mem, page, newpage, - (rc == MIGRATEPAGE_SUCCESS || - rc == MIGRATEPAGE_BALLOON_SUCCESS)); +out_unlock: unlock_page(page); out: return rc; @@ -958,17 +955,6 @@ static int unmap_and_move(new_page_t get_new_page, free_page_t put_new_page, rc = __unmap_and_move(page, newpage, force, mode); - if (unlikely(rc == MIGRATEPAGE_BALLOON_SUCCESS)) { - /* - * A ballooned page has been migrated already. - * Now, it's the time to wrap-up counters, - * handle the page back to Buddy and return. - */ - dec_zone_page_state(page, NR_ISOLATED_ANON + - page_is_file_cache(page)); - balloon_page_free(page); - return MIGRATEPAGE_SUCCESS; - } out: if (rc != -EAGAIN) { /* @@ -991,6 +977,9 @@ out: if (rc != MIGRATEPAGE_SUCCESS && put_new_page) { ClearPageSwapBacked(newpage); put_new_page(newpage, private); + } else if (unlikely(__is_movable_balloon_page(newpage))) { + /* drop our reference, page already in the balloon */ + put_page(newpage); } else putback_lru_page(newpage); @@ -1786,7 +1775,6 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm, pg_data_t *pgdat = NODE_DATA(node); int isolated = 0; struct page *new_page = NULL; - struct mem_cgroup *memcg = NULL; int page_lru = page_is_file_cache(page); unsigned long mmun_start = address & HPAGE_PMD_MASK; unsigned long mmun_end = mmun_start + HPAGE_PMD_SIZE; @@ -1852,15 +1840,6 @@ fail_putback: goto out_unlock; } - /* - * Traditional migration needs to prepare the memcg charge - * transaction early to prevent the old page from being - * uncharged when installing migration entries. Here we can - * save the potential rollback and start the charge transfer - * only when migration is already known to end successfully. - */ - mem_cgroup_prepare_migration(page, new_page, &memcg); - orig_entry = *pmd; entry = mk_pmd(new_page, vma->vm_page_prot); entry = pmd_mkhuge(entry); @@ -1888,14 +1867,10 @@ fail_putback: goto fail_putback; } + mem_cgroup_migrate(page, new_page, false); + page_remove_rmap(page); - /* - * Finish the charge transaction under the page table lock to - * prevent split_huge_page() from dividing up the charge - * before it's fully transferred to the new page. - */ - mem_cgroup_end_migration(memcg, page, new_page, true); spin_unlock(ptl); mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end); |