diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-03-22 20:04:48 +0400 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-03-22 20:04:48 +0400 |
commit | 95211279c5ad00a317c98221d7e4365e02f20836 (patch) | |
tree | 2ddc8625378d2915b8c96392f3cf6663b705ed55 /mm/rmap.c | |
parent | 5375871d432ae9fc581014ac117b96aaee3cd0c7 (diff) | |
parent | 12724850e8064f64b6223d26d78c0597c742c65a (diff) | |
download | linux-95211279c5ad00a317c98221d7e4365e02f20836.tar.xz |
Merge branch 'akpm' (Andrew's patch-bomb)
Merge first batch of patches from Andrew Morton:
"A few misc things and all the MM queue"
* emailed from Andrew Morton <akpm@linux-foundation.org>: (92 commits)
memcg: avoid THP split in task migration
thp: add HPAGE_PMD_* definitions for !CONFIG_TRANSPARENT_HUGEPAGE
memcg: clean up existing move charge code
mm/memcontrol.c: remove unnecessary 'break' in mem_cgroup_read()
mm/memcontrol.c: remove redundant BUG_ON() in mem_cgroup_usage_unregister_event()
mm/memcontrol.c: s/stealed/stolen/
memcg: fix performance of mem_cgroup_begin_update_page_stat()
memcg: remove PCG_FILE_MAPPED
memcg: use new logic for page stat accounting
memcg: remove PCG_MOVE_LOCK flag from page_cgroup
memcg: simplify move_account() check
memcg: remove EXPORT_SYMBOL(mem_cgroup_update_page_stat)
memcg: kill dead prev_priority stubs
memcg: remove PCG_CACHE page_cgroup flag
memcg: let css_get_next() rely upon rcu_read_lock()
cgroup: revert ss_id_lock to spinlock
idr: make idr_get_next() good for rcu_read_lock()
memcg: remove unnecessary thp check in page stat accounting
memcg: remove redundant returns
memcg: enum lru_list lru
...
Diffstat (limited to 'mm/rmap.c')
-rw-r--r-- | mm/rmap.c | 70 |
1 files changed, 44 insertions, 26 deletions
diff --git a/mm/rmap.c b/mm/rmap.c index c8454e06b6c8..5b5ad584ffb7 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -120,6 +120,21 @@ static void anon_vma_chain_free(struct anon_vma_chain *anon_vma_chain) kmem_cache_free(anon_vma_chain_cachep, anon_vma_chain); } +static void anon_vma_chain_link(struct vm_area_struct *vma, + struct anon_vma_chain *avc, + struct anon_vma *anon_vma) +{ + avc->vma = vma; + avc->anon_vma = anon_vma; + list_add(&avc->same_vma, &vma->anon_vma_chain); + + /* + * It's critical to add new vmas to the tail of the anon_vma, + * see comment in huge_memory.c:__split_huge_page(). + */ + list_add_tail(&avc->same_anon_vma, &anon_vma->head); +} + /** * anon_vma_prepare - attach an anon_vma to a memory region * @vma: the memory region in question @@ -175,10 +190,7 @@ int anon_vma_prepare(struct vm_area_struct *vma) spin_lock(&mm->page_table_lock); if (likely(!vma->anon_vma)) { vma->anon_vma = anon_vma; - avc->anon_vma = anon_vma; - avc->vma = vma; - list_add(&avc->same_vma, &vma->anon_vma_chain); - list_add_tail(&avc->same_anon_vma, &anon_vma->head); + anon_vma_chain_link(vma, avc, anon_vma); allocated = NULL; avc = NULL; } @@ -224,21 +236,6 @@ static inline void unlock_anon_vma_root(struct anon_vma *root) mutex_unlock(&root->mutex); } -static void anon_vma_chain_link(struct vm_area_struct *vma, - struct anon_vma_chain *avc, - struct anon_vma *anon_vma) -{ - avc->vma = vma; - avc->anon_vma = anon_vma; - list_add(&avc->same_vma, &vma->anon_vma_chain); - - /* - * It's critical to add new vmas to the tail of the anon_vma, - * see comment in huge_memory.c:__split_huge_page(). - */ - list_add_tail(&avc->same_anon_vma, &anon_vma->head); -} - /* * Attach the anon_vmas from src to dst. * Returns 0 on success, -ENOMEM on failure. @@ -1151,10 +1148,15 @@ void page_add_new_anon_rmap(struct page *page, */ void page_add_file_rmap(struct page *page) { + bool locked; + unsigned long flags; + + mem_cgroup_begin_update_page_stat(page, &locked, &flags); if (atomic_inc_and_test(&page->_mapcount)) { __inc_zone_page_state(page, NR_FILE_MAPPED); mem_cgroup_inc_page_stat(page, MEMCG_NR_FILE_MAPPED); } + mem_cgroup_end_update_page_stat(page, &locked, &flags); } /** @@ -1165,9 +1167,21 @@ void page_add_file_rmap(struct page *page) */ void page_remove_rmap(struct page *page) { + bool anon = PageAnon(page); + bool locked; + unsigned long flags; + + /* + * The anon case has no mem_cgroup page_stat to update; but may + * uncharge_page() below, where the lock ordering can deadlock if + * we hold the lock against page_stat move: so avoid it on anon. + */ + if (!anon) + mem_cgroup_begin_update_page_stat(page, &locked, &flags); + /* page still mapped by someone else? */ if (!atomic_add_negative(-1, &page->_mapcount)) - return; + goto out; /* * Now that the last pte has gone, s390 must transfer dirty @@ -1176,7 +1190,7 @@ void page_remove_rmap(struct page *page) * not if it's in swapcache - there might be another pte slot * containing the swap entry, but page not yet written to swap. */ - if ((!PageAnon(page) || PageSwapCache(page)) && + if ((!anon || PageSwapCache(page)) && page_test_and_clear_dirty(page_to_pfn(page), 1)) set_page_dirty(page); /* @@ -1184,8 +1198,8 @@ void page_remove_rmap(struct page *page) * and not charged by memcg for now. */ if (unlikely(PageHuge(page))) - return; - if (PageAnon(page)) { + goto out; + if (anon) { mem_cgroup_uncharge_page(page); if (!PageTransHuge(page)) __dec_zone_page_state(page, NR_ANON_PAGES); @@ -1205,6 +1219,9 @@ void page_remove_rmap(struct page *page) * Leaving it set also helps swapoff to reinstate ptes * faster for those pages still in swapcache. */ +out: + if (!anon) + mem_cgroup_end_update_page_stat(page, &locked, &flags); } /* @@ -1282,7 +1299,7 @@ int try_to_unmap_one(struct page *page, struct vm_area_struct *vma, } dec_mm_counter(mm, MM_ANONPAGES); inc_mm_counter(mm, MM_SWAPENTS); - } else if (PAGE_MIGRATION) { + } else if (IS_ENABLED(CONFIG_MIGRATION)) { /* * Store the pfn of the page in a special migration * pte. do_swap_page() will wait until the migration @@ -1293,7 +1310,8 @@ int try_to_unmap_one(struct page *page, struct vm_area_struct *vma, } set_pte_at(mm, address, pte, swp_entry_to_pte(entry)); BUG_ON(pte_file(*pte)); - } else if (PAGE_MIGRATION && (TTU_ACTION(flags) == TTU_MIGRATION)) { + } else if (IS_ENABLED(CONFIG_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)); @@ -1499,7 +1517,7 @@ static int try_to_unmap_anon(struct page *page, enum ttu_flags flags) * locking requirements of exec(), migration skips * temporary VMAs until after exec() completes. */ - if (PAGE_MIGRATION && (flags & TTU_MIGRATION) && + if (IS_ENABLED(CONFIG_MIGRATION) && (flags & TTU_MIGRATION) && is_vma_temporary_stack(vma)) continue; |