Commit e42d9d5d authored by Wu Fengguang's avatar Wu Fengguang Committed by Andi Kleen
Browse files

memcg: rename and export try_get_mem_cgroup_from_page() 



So that the hwpoison injector can get mem_cgroup for arbitrary page
and thus know whether it is owned by some mem_cgroup task(s).

[AK: Merged with latest git tree]

CC: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
CC: Hugh Dickins <hugh.dickins@tiscali.co.uk>
CC: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
CC: Balbir Singh <balbir@linux.vnet.ibm.com>
Acked-by: default avatarKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: default avatarWu Fengguang <fengguang.wu@intel.com>
Signed-off-by: default avatarAndi Kleen <ak@linux.intel.com>
parent 478c5ffc

include/linux/memcontrol.h

+6 −0
Original line number Diff line number Diff line
@@ -68,6 +68,7 @@ extern unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan, 
extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask);

int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem);



extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page);

extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);



static inline
@@ -189,6 +190,11 @@ mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to) 
{

}



static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)

{

	return NULL;

}



static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem)

{

	return 1;

mm/memcontrol.c

+4 −7
Original line number Diff line number Diff line
@@ -1379,25 +1379,22 @@ static struct mem_cgroup *mem_cgroup_lookup(unsigned short id) 
	return container_of(css, struct mem_cgroup, css);

}



static struct mem_cgroup *try_get_mem_cgroup_from_swapcache(struct page *page)

struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)

{

	struct mem_cgroup *mem;

	struct mem_cgroup *mem = NULL;

	struct page_cgroup *pc;

	unsigned short id;

	swp_entry_t ent;



	VM_BUG_ON(!PageLocked(page));



	if (!PageSwapCache(page))

		return NULL;



	pc = lookup_page_cgroup(page);

	lock_page_cgroup(pc);

	if (PageCgroupUsed(pc)) {

		mem = pc->mem_cgroup;

		if (mem && !css_tryget(&mem->css))

			mem = NULL;

	} else {

	} else if (PageSwapCache(page)) {

		ent.val = page_private(page);

		id = lookup_swap_cgroup(ent);

		rcu_read_lock();
@@ -1743,7 +1740,7 @@ int mem_cgroup_try_charge_swapin(struct mm_struct *mm, 
	 */

	if (!PageSwapCache(page))

		goto charge_cur_mm;

	mem = try_get_mem_cgroup_from_swapcache(page);

	mem = try_get_mem_cgroup_from_page(page);

	if (!mem)

		goto charge_cur_mm;

	*ptr = mem;

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