diff options
Diffstat (limited to 'mm/migrate.c')
| -rw-r--r-- | mm/migrate.c | 44 |
1 files changed, 25 insertions, 19 deletions
diff --git a/mm/migrate.c b/mm/migrate.c index 84381b5..b6700f2 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -685,6 +685,8 @@ void migrate_page_states(struct page *newpage, struct page *page) SetPageActive(newpage); } else if (TestClearPageUnevictable(page)) SetPageUnevictable(newpage); + if (PageWorkingset(page)) + SetPageWorkingset(newpage); if (PageChecked(page)) SetPageChecked(newpage); if (PageMappedToDisk(page)) @@ -1973,8 +1975,7 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm, int isolated = 0; struct page *new_page = 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; + unsigned long start = address & HPAGE_PMD_MASK; new_page = alloc_pages_node(node, (GFP_TRANSHUGE_LIGHT | __GFP_THISNODE), @@ -1997,15 +1998,15 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm, /* 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 */ - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end); ptl = pmd_lock(mm, pmd); if (unlikely(!pmd_same(*pmd, entry) || !page_ref_freeze(page, 2))) { spin_unlock(ptl); - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end); /* Reverse changes made by migrate_page_copy() */ if (TestClearPageActive(new_page)) @@ -2029,16 +2030,26 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm, entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma); /* - * Clear 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. + * 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. */ - flush_cache_range(vma, mmun_start, mmun_end); - page_add_anon_rmap(new_page, vma, mmun_start, true); - pmdp_huge_clear_flush_notify(vma, mmun_start, pmd); - set_pmd_at(mm, mmun_start, pmd, entry); + 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_sem 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); @@ -2047,11 +2058,6 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm, set_page_owner_migrate_reason(new_page, MR_NUMA_MISPLACED); spin_unlock(ptl); - /* - * No need to double call mmu_notifier->invalidate_range() callback as - * the above pmdp_huge_clear_flush_notify() did already call it. - */ - mmu_notifier_invalidate_range_only_end(mm, mmun_start, mmun_end); /* Take an "isolate" reference and put new page on the LRU. */ get_page(new_page); @@ -2075,7 +2081,7 @@ out_fail: ptl = pmd_lock(mm, pmd); if (pmd_same(*pmd, entry)) { entry = pmd_modify(entry, vma->vm_page_prot); - set_pmd_at(mm, mmun_start, pmd, entry); + set_pmd_at(mm, start, pmd, entry); update_mmu_cache_pmd(vma, address, &entry); } spin_unlock(ptl); |
