diff options
Diffstat (limited to 'mm/page_cgroup.c')
| -rw-r--r-- | mm/page_cgroup.c | 164 |
1 files changed, 57 insertions, 107 deletions
diff --git a/mm/page_cgroup.c b/mm/page_cgroup.c index 2d123f94a8df..de1616aa9b1e 100644 --- a/mm/page_cgroup.c +++ b/mm/page_cgroup.c @@ -11,13 +11,6 @@ #include <linux/swapops.h> #include <linux/kmemleak.h> -static void __meminit init_page_cgroup(struct page_cgroup *pc, unsigned long id) -{ - pc->flags = 0; - set_page_cgroup_array_id(pc, id); - pc->mem_cgroup = NULL; - INIT_LIST_HEAD(&pc->lru); -} static unsigned long total_usage; #if !defined(CONFIG_SPARSEMEM) @@ -35,35 +28,27 @@ struct page_cgroup *lookup_page_cgroup(struct page *page) struct page_cgroup *base; base = NODE_DATA(page_to_nid(page))->node_page_cgroup; +#ifdef CONFIG_DEBUG_VM + /* + * The sanity checks the page allocator does upon freeing a + * page can reach here before the page_cgroup arrays are + * allocated when feeding a range of pages to the allocator + * for the first time during bootup or memory hotplug. + */ if (unlikely(!base)) return NULL; - +#endif offset = pfn - NODE_DATA(page_to_nid(page))->node_start_pfn; return base + offset; } -struct page *lookup_cgroup_page(struct page_cgroup *pc) -{ - unsigned long pfn; - struct page *page; - pg_data_t *pgdat; - - pgdat = NODE_DATA(page_cgroup_array_id(pc)); - pfn = pc - pgdat->node_page_cgroup + pgdat->node_start_pfn; - page = pfn_to_page(pfn); - VM_BUG_ON(pc != lookup_page_cgroup(page)); - return page; -} - static int __init alloc_node_page_cgroup(int nid) { - struct page_cgroup *base, *pc; + struct page_cgroup *base; unsigned long table_size; - unsigned long start_pfn, nr_pages, index; + unsigned long nr_pages; - start_pfn = NODE_DATA(nid)->node_start_pfn; nr_pages = NODE_DATA(nid)->node_spanned_pages; - if (!nr_pages) return 0; @@ -73,10 +58,6 @@ static int __init alloc_node_page_cgroup(int nid) table_size, PAGE_SIZE, __pa(MAX_DMA_ADDRESS)); if (!base) return -ENOMEM; - for (index = 0; index < nr_pages; index++) { - pc = base + index; - init_page_cgroup(pc, nid); - } NODE_DATA(nid)->node_page_cgroup = base; total_usage += table_size; return 0; @@ -111,29 +92,23 @@ struct page_cgroup *lookup_page_cgroup(struct page *page) { unsigned long pfn = page_to_pfn(page); struct mem_section *section = __pfn_to_section(pfn); - +#ifdef CONFIG_DEBUG_VM + /* + * The sanity checks the page allocator does upon freeing a + * page can reach here before the page_cgroup arrays are + * allocated when feeding a range of pages to the allocator + * for the first time during bootup or memory hotplug. + */ if (!section->page_cgroup) return NULL; +#endif return section->page_cgroup + pfn; } -struct page *lookup_cgroup_page(struct page_cgroup *pc) -{ - struct mem_section *section; - struct page *page; - unsigned long nr; - - nr = page_cgroup_array_id(pc); - section = __nr_to_section(nr); - page = pfn_to_page(pc - section->page_cgroup); - VM_BUG_ON(pc != lookup_page_cgroup(page)); - return page; -} - static void *__meminit alloc_page_cgroup(size_t size, int nid) { + gfp_t flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN; void *addr = NULL; - gfp_t flags = GFP_KERNEL | __GFP_NOWARN; addr = alloc_pages_exact_nid(nid, size, flags); if (addr) { @@ -142,39 +117,20 @@ static void *__meminit alloc_page_cgroup(size_t size, int nid) } if (node_state(nid, N_HIGH_MEMORY)) - addr = vmalloc_node(size, nid); + addr = vzalloc_node(size, nid); else - addr = vmalloc(size); + addr = vzalloc(size); return addr; } -#ifdef CONFIG_MEMORY_HOTPLUG -static void free_page_cgroup(void *addr) -{ - if (is_vmalloc_addr(addr)) { - vfree(addr); - } else { - struct page *page = virt_to_page(addr); - size_t table_size = - sizeof(struct page_cgroup) * PAGES_PER_SECTION; - - BUG_ON(PageReserved(page)); - free_pages_exact(addr, table_size); - } -} -#endif - static int __meminit init_section_page_cgroup(unsigned long pfn, int nid) { - struct page_cgroup *base, *pc; struct mem_section *section; + struct page_cgroup *base; unsigned long table_size; - unsigned long nr; - int index; - nr = pfn_to_section_nr(pfn); - section = __nr_to_section(nr); + section = __pfn_to_section(pfn); if (section->page_cgroup) return 0; @@ -194,10 +150,6 @@ static int __meminit init_section_page_cgroup(unsigned long pfn, int nid) return -ENOMEM; } - for (index = 0; index < PAGES_PER_SECTION; index++) { - pc = base + index; - init_page_cgroup(pc, nr); - } /* * The passed "pfn" may not be aligned to SECTION. For the calculation * we need to apply a mask. @@ -208,6 +160,20 @@ static int __meminit init_section_page_cgroup(unsigned long pfn, int nid) return 0; } #ifdef CONFIG_MEMORY_HOTPLUG +static void free_page_cgroup(void *addr) +{ + if (is_vmalloc_addr(addr)) { + vfree(addr); + } else { + struct page *page = virt_to_page(addr); + size_t table_size = + sizeof(struct page_cgroup) * PAGES_PER_SECTION; + + BUG_ON(PageReserved(page)); + free_pages_exact(addr, table_size); + } +} + void __free_page_cgroup(unsigned long pfn) { struct mem_section *ms; @@ -366,7 +332,6 @@ struct swap_cgroup { unsigned short id; }; #define SC_PER_PAGE (PAGE_SIZE/sizeof(struct swap_cgroup)) -#define SC_POS_MASK (SC_PER_PAGE - 1) /* * SwapCgroup implements "lookup" and "exchange" operations. @@ -408,6 +373,21 @@ not_enough_page: return -ENOMEM; } +static struct swap_cgroup *lookup_swap_cgroup(swp_entry_t ent, + struct swap_cgroup_ctrl **ctrlp) +{ + pgoff_t offset = swp_offset(ent); + struct swap_cgroup_ctrl *ctrl; + struct page *mappage; + + ctrl = &swap_cgroup_ctrl[swp_type(ent)]; + if (ctrlp) + *ctrlp = ctrl; + + mappage = ctrl->map[offset / SC_PER_PAGE]; + return page_address(mappage) + offset % SC_PER_PAGE; +} + /** * swap_cgroup_cmpxchg - cmpxchg mem_cgroup's id for this swp_entry. * @end: swap entry to be cmpxchged @@ -420,21 +400,13 @@ not_enough_page: unsigned short swap_cgroup_cmpxchg(swp_entry_t ent, unsigned short old, unsigned short new) { - int type = swp_type(ent); - unsigned long offset = swp_offset(ent); - unsigned long idx = offset / SC_PER_PAGE; - unsigned long pos = offset & SC_POS_MASK; struct swap_cgroup_ctrl *ctrl; - struct page *mappage; struct swap_cgroup *sc; unsigned long flags; unsigned short retval; - ctrl = &swap_cgroup_ctrl[type]; + sc = lookup_swap_cgroup(ent, &ctrl); - mappage = ctrl->map[idx]; - sc = page_address(mappage); - sc += pos; spin_lock_irqsave(&ctrl->lock, flags); retval = sc->id; if (retval == old) @@ -455,21 +427,13 @@ unsigned short swap_cgroup_cmpxchg(swp_entry_t ent, */ unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id) { - int type = swp_type(ent); - unsigned long offset = swp_offset(ent); - unsigned long idx = offset / SC_PER_PAGE; - unsigned long pos = offset & SC_POS_MASK; struct swap_cgroup_ctrl *ctrl; - struct page *mappage; struct swap_cgroup *sc; unsigned short old; unsigned long flags; - ctrl = &swap_cgroup_ctrl[type]; + sc = lookup_swap_cgroup(ent, &ctrl); - mappage = ctrl->map[idx]; - sc = page_address(mappage); - sc += pos; spin_lock_irqsave(&ctrl->lock, flags); old = sc->id; sc->id = id; @@ -479,28 +443,14 @@ unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id) } /** - * lookup_swap_cgroup - lookup mem_cgroup tied to swap entry + * lookup_swap_cgroup_id - lookup mem_cgroup id tied to swap entry * @ent: swap entry to be looked up. * * Returns CSS ID of mem_cgroup at success. 0 at failure. (0 is invalid ID) */ -unsigned short lookup_swap_cgroup(swp_entry_t ent) +unsigned short lookup_swap_cgroup_id(swp_entry_t ent) { - int type = swp_type(ent); - unsigned long offset = swp_offset(ent); - unsigned long idx = offset / SC_PER_PAGE; - unsigned long pos = offset & SC_POS_MASK; - struct swap_cgroup_ctrl *ctrl; - struct page *mappage; - struct swap_cgroup *sc; - unsigned short ret; - - ctrl = &swap_cgroup_ctrl[type]; - mappage = ctrl->map[idx]; - sc = page_address(mappage); - sc += pos; - ret = sc->id; - return ret; + return lookup_swap_cgroup(ent, NULL)->id; } int swap_cgroup_swapon(int type, unsigned long max_pages) |