2018-04-22 15:14:54

by wanglong

Subject: [PATCH v2] memcg: writeback: use memcg->cgwb_list directly

mem_cgroup_cgwb_list is a very simple wrapper and it will
never be used outside of code under CONFIG_CGROUP_WRITEBACK.
so use memcg->cgwb_list directly.

Reviewed-by: Jan Kara <[email protected]>
Signed-off-by: Wang Long <[email protected]>
---
include/linux/memcontrol.h | 1 -
mm/backing-dev.c | 4 ++--
mm/memcontrol.c | 5 -----
3 files changed, 2 insertions(+), 8 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index d99b71b..c0056e0 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -1093,7 +1093,6 @@ static inline void dec_lruvec_page_state(struct page *page,

#ifdef CONFIG_CGROUP_WRITEBACK

-struct list_head *mem_cgroup_cgwb_list(struct mem_cgroup *memcg);
struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb);
void mem_cgroup_wb_stats(struct bdi_writeback *wb, unsigned long *pfilepages,
unsigned long *pheadroom, unsigned long *pdirty,
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 023190c..0a48e05 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -555,7 +555,7 @@ static int cgwb_create(struct backing_dev_info *bdi,
memcg = mem_cgroup_from_css(memcg_css);
blkcg_css = cgroup_get_e_css(memcg_css->cgroup, &io_cgrp_subsys);
blkcg = css_to_blkcg(blkcg_css);
- memcg_cgwb_list = mem_cgroup_cgwb_list(memcg);
+ memcg_cgwb_list = &memcg->cgwb_list;
blkcg_cgwb_list = &blkcg->cgwb_list;

/* look up again under lock and discard on blkcg mismatch */
@@ -734,7 +734,7 @@ static void cgwb_bdi_unregister(struct backing_dev_info *bdi)
*/
void wb_memcg_offline(struct mem_cgroup *memcg)
{
- struct list_head *memcg_cgwb_list = mem_cgroup_cgwb_list(memcg);
+ struct list_head *memcg_cgwb_list = &memcg->cgwb_list;
struct bdi_writeback *wb, *next;

spin_lock_irq(&cgwb_lock);
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index e074f7c..d1adb9c 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3562,11 +3562,6 @@ static int mem_cgroup_oom_control_write(struct cgroup_subsys_state *css,

#ifdef CONFIG_CGROUP_WRITEBACK

-struct list_head *mem_cgroup_cgwb_list(struct mem_cgroup *memcg)
-{
- return &memcg->cgwb_list;
-}
-
static int memcg_wb_domain_init(struct mem_cgroup *memcg, gfp_t gfp)
{
return wb_domain_init(&memcg->cgwb_domain, gfp);
--
1.8.3.1

2018-04-26 18:55:37

by Tejun Heo

Subject: Re: [PATCH v2] memcg: writeback: use memcg->cgwb_list directly

On Sun, Apr 22, 2018 at 10:09:33PM +0800, Wang Long wrote:
> mem_cgroup_cgwb_list is a very simple wrapper and it will
> never be used outside of code under CONFIG_CGROUP_WRITEBACK.
> so use memcg->cgwb_list directly.
>
> Reviewed-by: Jan Kara <[email protected]>
> Signed-off-by: Wang Long <[email protected]>

Acked-by: Tejun Heo <[email protected]>

Thanks.

--
tejun

2018-04-27 11:47:36

by Michal Hocko

Subject: Re: [PATCH v2] memcg: writeback: use memcg->cgwb_list directly

On Sun 22-04-18 22:09:33, Wang Long wrote:
> mem_cgroup_cgwb_list is a very simple wrapper and it will
> never be used outside of code under CONFIG_CGROUP_WRITEBACK.
> so use memcg->cgwb_list directly.

Thanks for adding the changelog

> Reviewed-by: Jan Kara <[email protected]>
> Signed-off-by: Wang Long <[email protected]>

Acked-by: Michal Hocko <[email protected]>

> ---
> include/linux/memcontrol.h | 1 -
> mm/backing-dev.c | 4 ++--
> mm/memcontrol.c | 5 -----
> 3 files changed, 2 insertions(+), 8 deletions(-)
>
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index d99b71b..c0056e0 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -1093,7 +1093,6 @@ static inline void dec_lruvec_page_state(struct page *page,
>
> #ifdef CONFIG_CGROUP_WRITEBACK
>
> -struct list_head *mem_cgroup_cgwb_list(struct mem_cgroup *memcg);
> struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb);
> void mem_cgroup_wb_stats(struct bdi_writeback *wb, unsigned long *pfilepages,
> unsigned long *pheadroom, unsigned long *pdirty,
> diff --git a/mm/backing-dev.c b/mm/backing-dev.c
> index 023190c..0a48e05 100644
> --- a/mm/backing-dev.c
> +++ b/mm/backing-dev.c
> @@ -555,7 +555,7 @@ static int cgwb_create(struct backing_dev_info *bdi,
> memcg = mem_cgroup_from_css(memcg_css);
> blkcg_css = cgroup_get_e_css(memcg_css->cgroup, &io_cgrp_subsys);
> blkcg = css_to_blkcg(blkcg_css);
> - memcg_cgwb_list = mem_cgroup_cgwb_list(memcg);
> + memcg_cgwb_list = &memcg->cgwb_list;
> blkcg_cgwb_list = &blkcg->cgwb_list;
>
> /* look up again under lock and discard on blkcg mismatch */
> @@ -734,7 +734,7 @@ static void cgwb_bdi_unregister(struct backing_dev_info *bdi)
> */
> void wb_memcg_offline(struct mem_cgroup *memcg)
> {
> - struct list_head *memcg_cgwb_list = mem_cgroup_cgwb_list(memcg);
> + struct list_head *memcg_cgwb_list = &memcg->cgwb_list;
> struct bdi_writeback *wb, *next;
>
> spin_lock_irq(&cgwb_lock);
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index e074f7c..d1adb9c 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -3562,11 +3562,6 @@ static int mem_cgroup_oom_control_write(struct cgroup_subsys_state *css,
>
> #ifdef CONFIG_CGROUP_WRITEBACK
>
> -struct list_head *mem_cgroup_cgwb_list(struct mem_cgroup *memcg)
> -{
> - return &memcg->cgwb_list;
> -}
> -
> static int memcg_wb_domain_init(struct mem_cgroup *memcg, gfp_t gfp)
> {
> return wb_domain_init(&memcg->cgwb_domain, gfp);
> --
> 1.8.3.1

--
Michal Hocko
SUSE Labs