On Thu 05-07-12 02:45:01, Johannes Weiner wrote:
> When shmem is charged upon swapin, it does not need to check twice
> whether the memory controller is enabled.
>
> Also, shmem pages do not have to be checked for everything that
> regular anon pages have to be checked for, so let shmem use the
> internal version directly and allow future patches to move around
> checks that are only required when swapping in anon pages.
>
> Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxx>
> ---
> mm/memcontrol.c | 24 +++++++++++++++---------
> 1 files changed, 15 insertions(+), 9 deletions(-)
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 6fe4101..a8bf86a 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -2734,18 +2734,14 @@ int mem_cgroup_newpage_charge(struct page *page,
> * struct page_cgroup is acquired. This refcnt will be consumed by
> * "commit()" or removed by "cancel()"
> */
> -int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
> - struct page *page,
> - gfp_t mask, struct mem_cgroup **memcgp)
> +static int __mem_cgroup_try_charge_swapin(struct mm_struct *mm,
> + struct page *page,
> + gfp_t mask,
> + struct mem_cgroup **memcgp)
> {
> struct mem_cgroup *memcg;
> int ret;
>
> - *memcgp = NULL;
> -
> - if (mem_cgroup_disabled())
> - return 0;
> -
> if (!do_swap_account)
> goto charge_cur_mm;
> /*
> @@ -2772,6 +2768,15 @@ int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
> return ret;
> }
>
> +int mem_cgroup_try_charge_swapin(struct mm_struct *mm, struct page *page,
> + gfp_t gfp_mask, struct mem_cgroup **memcgp)
> +{
> + *memcgp = NULL;
> + if (mem_cgroup_disabled())
> + return 0;
> + return __mem_cgroup_try_charge_swapin(mm, page, gfp_mask, memcgp);
> +}
> +
> void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg)
> {
> if (mem_cgroup_disabled())
> @@ -2833,7 +2838,8 @@ int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
> if (!PageSwapCache(page))
> ret = mem_cgroup_charge_common(page, mm, gfp_mask, type);
> else { /* page is swapcache/shmem */
> - ret = mem_cgroup_try_charge_swapin(mm, page, gfp_mask, &memcg);
> + ret = __mem_cgroup_try_charge_swapin(mm, page,
> + gfp_mask, &memcg);
> if (!ret)
> __mem_cgroup_commit_charge_swapin(page, memcg, type);
> }
> --
> 1.7.7.6
>
--
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9
Czech Republic
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