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| author | Wu Fengguang <fengguang.wu@intel.com> | 2009-12-16 12:19:59 +0100 |
|---|---|---|
| committer | Andi Kleen <ak@linux.intel.com> | 2009-12-16 12:19:59 +0100 |
| commit | e42d9d5d47961fb5db0be65b56dd52fe7b2421f1 (patch) | |
| tree | 6a898c8d43ee0533581076342b9a7a97cca0509e /mm/memcontrol.c | |
| parent | 478c5ffc0b50527bd2390f2daa46cc16276b8413 (diff) | |
| download | linux-e42d9d5d47961fb5db0be65b56dd52fe7b2421f1.tar.gz | |
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: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Andi Kleen <ak@linux.intel.com>
Diffstat (limited to 'mm/memcontrol.c')
| -rw-r--r-- | mm/memcontrol.c | 11 |
1 files changed, 4 insertions, 7 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index e0c2066495e3..b5ac61ce7346 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -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; |