On Tue 21-03-17 20:51:11, Johannes Weiner wrote:
> Huge pages are accounted as single units in the memcg's "file_mapped"
> counter. Account the correct number of base pages, like we do in the
> corresponding node counter.
>
> Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
with the CC: stable
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
thanks!
> ---
> include/linux/memcontrol.h | 6 ++++++
> mm/rmap.c | 4 ++--
> 2 files changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index baa274150210..c5ebb32fef49 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -741,6 +741,12 @@ static inline bool mem_cgroup_oom_synchronize(bool wait)
> return false;
> }
>
> +static inline void mem_cgroup_update_page_stat(struct page *page,
> + enum mem_cgroup_stat_index idx,
> + int nr)
> +{
> +}
> +
> static inline void mem_cgroup_inc_page_stat(struct page *page,
> enum mem_cgroup_stat_index idx)
> {
> diff --git a/mm/rmap.c b/mm/rmap.c
> index 1d82057144ba..f514cdd84482 100644
> --- a/mm/rmap.c
> +++ b/mm/rmap.c
> @@ -1154,7 +1154,7 @@ void page_add_file_rmap(struct page *page, bool compound)
> goto out;
> }
> __mod_node_page_state(page_pgdat(page), NR_FILE_MAPPED, nr);
> - mem_cgroup_inc_page_stat(page, MEM_CGROUP_STAT_FILE_MAPPED);
> + mem_cgroup_update_page_stat(page, MEM_CGROUP_STAT_FILE_MAPPED, nr);
> out:
> unlock_page_memcg(page);
> }
> @@ -1194,7 +1194,7 @@ static void page_remove_file_rmap(struct page *page, bool compound)
> * pte lock(a spinlock) is held, which implies preemption disabled.
> */
> __mod_node_page_state(page_pgdat(page), NR_FILE_MAPPED, -nr);
> - mem_cgroup_dec_page_stat(page, MEM_CGROUP_STAT_FILE_MAPPED);
> + mem_cgroup_update_page_stat(page, MEM_CGROUP_STAT_FILE_MAPPED, -nr);
>
> if (unlikely(PageMlocked(page)))
> clear_page_mlock(page);
> --
> 2.12.0
>
--
Michal Hocko
SUSE Labs
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