diff options
Diffstat (limited to 'mm/rmap.c')
| -rw-r--r-- | mm/rmap.c | 66 |
1 files changed, 54 insertions, 12 deletions
diff --git a/mm/rmap.c b/mm/rmap.c index dbc2ca2057a..997f06907b6 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -36,7 +36,6 @@ * mapping->tree_lock (widely used, in set_page_dirty, * in arch-dependent flush_dcache_mmap_lock, * within inode_lock in __sync_single_inode) - * zone->lock (within radix tree node alloc) */ #include <linux/mm.h> @@ -49,6 +48,7 @@ #include <linux/rcupdate.h> #include <linux/module.h> #include <linux/kallsyms.h> +#include <linux/memcontrol.h> #include <asm/tlbflush.h> @@ -284,7 +284,10 @@ static int page_referenced_one(struct page *page, if (!pte) goto out; - if (ptep_clear_flush_young(vma, address, pte)) + if (vma->vm_flags & VM_LOCKED) { + referenced++; + *mapcount = 1; /* break early from loop */ + } else if (ptep_clear_flush_young(vma, address, pte)) referenced++; /* Pretend the page is referenced if the task has the @@ -299,7 +302,8 @@ out: return referenced; } -static int page_referenced_anon(struct page *page) +static int page_referenced_anon(struct page *page, + struct mem_cgroup *mem_cont) { unsigned int mapcount; struct anon_vma *anon_vma; @@ -312,6 +316,13 @@ static int page_referenced_anon(struct page *page) mapcount = page_mapcount(page); list_for_each_entry(vma, &anon_vma->head, anon_vma_node) { + /* + * If we are reclaiming on behalf of a cgroup, skip + * counting on behalf of references from different + * cgroups + */ + if (mem_cont && !mm_match_cgroup(vma->vm_mm, mem_cont)) + continue; referenced += page_referenced_one(page, vma, &mapcount); if (!mapcount) break; @@ -324,6 +335,7 @@ static int page_referenced_anon(struct page *page) /** * page_referenced_file - referenced check for object-based rmap * @page: the page we're checking references on. + * @mem_cont: target memory controller * * For an object-based mapped page, find all the places it is mapped and * check/clear the referenced flag. This is done by following the page->mapping @@ -332,7 +344,8 @@ static int page_referenced_anon(struct page *page) * * This function is only called from page_referenced for object-based pages. */ -static int page_referenced_file(struct page *page) +static int page_referenced_file(struct page *page, + struct mem_cgroup *mem_cont) { unsigned int mapcount; struct address_space *mapping = page->mapping; @@ -365,6 +378,13 @@ static int page_referenced_file(struct page *page) mapcount = page_mapcount(page); vma_prio_tree_foreach(vma, &iter, &mapping->i_mmap, pgoff, pgoff) { + /* + * If we are reclaiming on behalf of a cgroup, skip + * counting on behalf of references from different + * cgroups + */ + if (mem_cont && !mm_match_cgroup(vma->vm_mm, mem_cont)) + continue; if ((vma->vm_flags & (VM_LOCKED|VM_MAYSHARE)) == (VM_LOCKED|VM_MAYSHARE)) { referenced++; @@ -383,11 +403,13 @@ static int page_referenced_file(struct page *page) * page_referenced - test if the page was referenced * @page: the page to test * @is_locked: caller holds lock on the page + * @mem_cont: target memory controller * * Quick test_and_clear_referenced for all mappings to a page, * returns the number of ptes which referenced the page. */ -int page_referenced(struct page *page, int is_locked) +int page_referenced(struct page *page, int is_locked, + struct mem_cgroup *mem_cont) { int referenced = 0; @@ -399,14 +421,15 @@ int page_referenced(struct page *page, int is_locked) if (page_mapped(page) && page->mapping) { if (PageAnon(page)) - referenced += page_referenced_anon(page); + referenced += page_referenced_anon(page, mem_cont); else if (is_locked) - referenced += page_referenced_file(page); + referenced += page_referenced_file(page, mem_cont); else if (TestSetPageLocked(page)) referenced++; else { if (page->mapping) - referenced += page_referenced_file(page); + referenced += + page_referenced_file(page, mem_cont); unlock_page(page); } } @@ -485,7 +508,7 @@ int page_mkclean(struct page *page) EXPORT_SYMBOL_GPL(page_mkclean); /** - * page_set_anon_rmap - setup new anonymous rmap + * __page_set_anon_rmap - setup new anonymous rmap * @page: the page to add the mapping to * @vma: the vm area in which the mapping is added * @address: the user virtual address mapped @@ -509,7 +532,7 @@ static void __page_set_anon_rmap(struct page *page, } /** - * page_set_anon_rmap - sanity check anonymous rmap addition + * __page_check_anon_rmap - sanity check anonymous rmap addition * @page: the page to add the mapping to * @vma: the vm area in which the mapping is added * @address: the user virtual address mapped @@ -552,11 +575,17 @@ void page_add_anon_rmap(struct page *page, VM_BUG_ON(address < vma->vm_start || address >= vma->vm_end); if (atomic_inc_and_test(&page->_mapcount)) __page_set_anon_rmap(page, vma, address); - else + else { __page_check_anon_rmap(page, vma, address); + /* + * We unconditionally charged during prepare, we uncharge here + * This takes care of balancing the reference counts + */ + mem_cgroup_uncharge_page(page); + } } -/* +/** * page_add_new_anon_rmap - add pte mapping to a new anonymous page * @page: the page to add the mapping to * @vma: the vm area in which the mapping is added @@ -584,12 +613,20 @@ void page_add_file_rmap(struct page *page) { if (atomic_inc_and_test(&page->_mapcount)) __inc_zone_page_state(page, NR_FILE_MAPPED); + else + /* + * We unconditionally charged during prepare, we uncharge here + * This takes care of balancing the reference counts + */ + mem_cgroup_uncharge_page(page); } #ifdef CONFIG_DEBUG_VM /** * page_dup_rmap - duplicate pte mapping to a page * @page: the page to add the mapping to + * @vma: the vm area being duplicated + * @address: the user virtual address mapped * * For copy_page_range only: minimal extract from page_add_file_rmap / * page_add_anon_rmap, avoiding unnecessary tests (already checked) so it's @@ -609,6 +646,7 @@ void page_dup_rmap(struct page *page, struct vm_area_struct *vma, unsigned long /** * page_remove_rmap - take down pte mapping from a page * @page: page to remove mapping from + * @vma: the vm area in which the mapping is removed * * The caller needs to hold the pte lock. */ @@ -644,6 +682,8 @@ void page_remove_rmap(struct page *page, struct vm_area_struct *vma) page_clear_dirty(page); set_page_dirty(page); } + mem_cgroup_uncharge_page(page); + __dec_zone_page_state(page, PageAnon(page) ? NR_ANON_PAGES : NR_FILE_MAPPED); } @@ -855,6 +895,7 @@ static int try_to_unmap_anon(struct page *page, int migration) /** * try_to_unmap_file - unmap file page using the object-based rmap method * @page: the page to unmap + * @migration: migration flag * * Find all the mappings of a page using the mapping pointer and the vma chains * contained in the address_space struct it points to. @@ -951,6 +992,7 @@ out: /** * try_to_unmap - try to remove all page table mappings to a page * @page: the page to get unmapped + * @migration: migration flag * * Tries to remove all the page table entries which are mapping this * page, used in the pageout path. Caller must hold the page lock. |