X-Git-Url: http://ftp.safe.ca/?p=safe%2Fjmp%2Flinux-2.6;a=blobdiff_plain;f=mm%2Frmap.c;h=28aafe2b530668b03c766619a83873ee2a91087e;hp=720fc03a7bc454de75fa86f542770ab9b9660788;hb=db16826367fefcb0ddb93d76b66adc52eb4e6339;hpb=cd6045138ed1bb5d8773e940d51c34318eef3ef2 diff --git a/mm/rmap.c b/mm/rmap.c index 720fc03..28aafe2 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -36,6 +36,11 @@ * mapping->tree_lock (widely used, in set_page_dirty, * in arch-dependent flush_dcache_mmap_lock, * within inode_lock in __sync_single_inode) + * + * (code doesn't rely on that order so it could be switched around) + * ->tasklist_lock + * anon_vma->lock (memory_failure, collect_procs_anon) + * pte map lock */ #include @@ -191,7 +196,7 @@ void __init anon_vma_init(void) * Getting a lock on a stable anon_vma from a page off the LRU is * tricky: page_lock_anon_vma rely on RCU to guard against the races. */ -static struct anon_vma *page_lock_anon_vma(struct page *page) +struct anon_vma *page_lock_anon_vma(struct page *page) { struct anon_vma *anon_vma; unsigned long anon_mapping; @@ -211,7 +216,7 @@ out: return NULL; } -static void page_unlock_anon_vma(struct anon_vma *anon_vma) +void page_unlock_anon_vma(struct anon_vma *anon_vma) { spin_unlock(&anon_vma->lock); rcu_read_unlock(); @@ -311,7 +316,7 @@ pte_t *page_check_address(struct page *page, struct mm_struct *mm, * if the page is not mapped into the page tables of this VMA. Only * valid for normal file or anonymous VMAs. */ -static int page_mapped_in_vma(struct page *page, struct vm_area_struct *vma) +int page_mapped_in_vma(struct page *page, struct vm_area_struct *vma) { unsigned long address; pte_t *pte; @@ -756,7 +761,7 @@ void page_remove_rmap(struct page *page) * repeatedly from either try_to_unmap_anon or try_to_unmap_file. */ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma, - int migration) + enum ttu_flags flags) { struct mm_struct *mm = vma->vm_mm; unsigned long address; @@ -778,11 +783,13 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma, * If it's recently referenced (perhaps page_referenced * skipped over this mm) then we should reactivate it. */ - if (!migration) { + if (!(flags & TTU_IGNORE_MLOCK)) { if (vma->vm_flags & VM_LOCKED) { ret = SWAP_MLOCK; goto out_unmap; } + } + if (!(flags & TTU_IGNORE_ACCESS)) { if (ptep_clear_flush_young_notify(vma, address, pte)) { ret = SWAP_FAIL; goto out_unmap; @@ -800,7 +807,14 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma, /* Update high watermark before we lower rss */ update_hiwater_rss(mm); - if (PageAnon(page)) { + if (PageHWPoison(page) && !(flags & TTU_IGNORE_HWPOISON)) { + if (PageAnon(page)) + dec_mm_counter(mm, anon_rss); + else + dec_mm_counter(mm, file_rss); + set_pte_at(mm, address, pte, + swp_entry_to_pte(make_hwpoison_entry(page))); + } else if (PageAnon(page)) { swp_entry_t entry = { .val = page_private(page) }; if (PageSwapCache(page)) { @@ -822,12 +836,12 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma, * pte. do_swap_page() will wait until the migration * pte is removed and then restart fault handling. */ - BUG_ON(!migration); + BUG_ON(TTU_ACTION(flags) != TTU_MIGRATION); entry = make_migration_entry(page, pte_write(pteval)); } set_pte_at(mm, address, pte, swp_entry_to_pte(entry)); BUG_ON(pte_file(*pte)); - } else if (PAGE_MIGRATION && migration) { + } else if (PAGE_MIGRATION && (TTU_ACTION(flags) == TTU_MIGRATION)) { /* Establish migration entry for a file page */ swp_entry_t entry; entry = make_migration_entry(page, pte_write(pteval)); @@ -996,12 +1010,13 @@ static int try_to_mlock_page(struct page *page, struct vm_area_struct *vma) * vm_flags for that VMA. That should be OK, because that vma shouldn't be * 'LOCKED. */ -static int try_to_unmap_anon(struct page *page, int unlock, int migration) +static int try_to_unmap_anon(struct page *page, enum ttu_flags flags) { struct anon_vma *anon_vma; struct vm_area_struct *vma; unsigned int mlocked = 0; int ret = SWAP_AGAIN; + int unlock = TTU_ACTION(flags) == TTU_MUNLOCK; if (MLOCK_PAGES && unlikely(unlock)) ret = SWAP_SUCCESS; /* default for try_to_munlock() */ @@ -1017,7 +1032,7 @@ static int try_to_unmap_anon(struct page *page, int unlock, int migration) continue; /* must visit all unlocked vmas */ ret = SWAP_MLOCK; /* saw at least one mlocked vma */ } else { - ret = try_to_unmap_one(page, vma, migration); + ret = try_to_unmap_one(page, vma, flags); if (ret == SWAP_FAIL || !page_mapped(page)) break; } @@ -1041,8 +1056,7 @@ static int try_to_unmap_anon(struct page *page, int unlock, int migration) /** * try_to_unmap_file - unmap/unlock file page using the object-based rmap method * @page: the page to unmap/unlock - * @unlock: request for unlock rather than unmap [unlikely] - * @migration: unmapping for migration - ignored if @unlock + * @flags: action and flags * * Find all the mappings of a page using the mapping pointer and the vma chains * contained in the address_space struct it points to. @@ -1054,7 +1068,7 @@ static int try_to_unmap_anon(struct page *page, int unlock, int migration) * vm_flags for that VMA. That should be OK, because that vma shouldn't be * 'LOCKED. */ -static int try_to_unmap_file(struct page *page, int unlock, int migration) +static int try_to_unmap_file(struct page *page, enum ttu_flags flags) { struct address_space *mapping = page->mapping; pgoff_t pgoff = page->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT); @@ -1066,6 +1080,7 @@ static int try_to_unmap_file(struct page *page, int unlock, int migration) unsigned long max_nl_size = 0; unsigned int mapcount; unsigned int mlocked = 0; + int unlock = TTU_ACTION(flags) == TTU_MUNLOCK; if (MLOCK_PAGES && unlikely(unlock)) ret = SWAP_SUCCESS; /* default for try_to_munlock() */ @@ -1078,7 +1093,7 @@ static int try_to_unmap_file(struct page *page, int unlock, int migration) continue; /* must visit all vmas */ ret = SWAP_MLOCK; } else { - ret = try_to_unmap_one(page, vma, migration); + ret = try_to_unmap_one(page, vma, flags); if (ret == SWAP_FAIL || !page_mapped(page)) goto out; } @@ -1103,7 +1118,8 @@ static int try_to_unmap_file(struct page *page, int unlock, int migration) ret = SWAP_MLOCK; /* leave mlocked == 0 */ goto out; /* no need to look further */ } - if (!MLOCK_PAGES && !migration && (vma->vm_flags & VM_LOCKED)) + if (!MLOCK_PAGES && !(flags & TTU_IGNORE_MLOCK) && + (vma->vm_flags & VM_LOCKED)) continue; cursor = (unsigned long) vma->vm_private_data; if (cursor > max_nl_cursor) @@ -1137,7 +1153,7 @@ static int try_to_unmap_file(struct page *page, int unlock, int migration) do { list_for_each_entry(vma, &mapping->i_mmap_nonlinear, shared.vm_set.list) { - if (!MLOCK_PAGES && !migration && + if (!MLOCK_PAGES && !(flags & TTU_IGNORE_MLOCK) && (vma->vm_flags & VM_LOCKED)) continue; cursor = (unsigned long) vma->vm_private_data; @@ -1177,7 +1193,7 @@ out: /** * try_to_unmap - try to remove all page table mappings to a page * @page: the page to get unmapped - * @migration: migration flag + * @flags: action and flags * * Tries to remove all the page table entries which are mapping this * page, used in the pageout path. Caller must hold the page lock. @@ -1188,16 +1204,16 @@ out: * SWAP_FAIL - the page is unswappable * SWAP_MLOCK - page is mlocked. */ -int try_to_unmap(struct page *page, int migration) +int try_to_unmap(struct page *page, enum ttu_flags flags) { int ret; BUG_ON(!PageLocked(page)); if (PageAnon(page)) - ret = try_to_unmap_anon(page, 0, migration); + ret = try_to_unmap_anon(page, flags); else - ret = try_to_unmap_file(page, 0, migration); + ret = try_to_unmap_file(page, flags); if (ret != SWAP_MLOCK && !page_mapped(page)) ret = SWAP_SUCCESS; return ret; @@ -1222,8 +1238,8 @@ int try_to_munlock(struct page *page) VM_BUG_ON(!PageLocked(page) || PageLRU(page)); if (PageAnon(page)) - return try_to_unmap_anon(page, 1, 0); + return try_to_unmap_anon(page, TTU_MUNLOCK); else - return try_to_unmap_file(page, 1, 0); + return try_to_unmap_file(page, TTU_MUNLOCK); }