Re: [PATCH 2/8] mm: memcontrol: export root_mem_cgroup

[Michal Hocko]

On Thu 22-10-15 00:21:30, Johannes Weiner wrote:
> A later patch will need this symbol in files other than memcontrol.c,
> so export it now and replace mem_cgroup_root_css at the same time.
> 
> Signed-off-by: Johannes Weiner 

Acked-by: Michal Hocko 

> ---
>  include/linux/memcontrol.h | 3 ++-
>  mm/backing-dev.c   | 2 +-
>  mm/memcontrol.c| 5 ++---
>  3 files changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index 805da1f..19ff87b 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -275,7 +275,8 @@ struct mem_cgroup {
>   struct mem_cgroup_per_node *nodeinfo[0];
>   /* WARNING: nodeinfo must be the last member here */
>  };
> -extern struct cgroup_subsys_state *mem_cgroup_root_css;
> +
> +extern struct mem_cgroup *root_mem_cgroup;
>  
>  /**
>   * mem_cgroup_events - count memory events against a cgroup
> diff --git a/mm/backing-dev.c b/mm/backing-dev.c
> index 095b23b..73ab967 100644
> --- a/mm/backing-dev.c
> +++ b/mm/backing-dev.c
> @@ -702,7 +702,7 @@ static int cgwb_bdi_init(struct backing_dev_info *bdi)
>  
>   ret = wb_init(>wb, bdi, 1, GFP_KERNEL);
>   if (!ret) {
> - bdi->wb.memcg_css = mem_cgroup_root_css;
> + bdi->wb.memcg_css = _mem_cgroup->css;
>   bdi->wb.blkcg_css = blkcg_root_css;
>   }
>   return ret;
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index a8ccdbc..e54f434 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -76,9 +76,9 @@
>  struct cgroup_subsys memory_cgrp_subsys __read_mostly;
>  EXPORT_SYMBOL(memory_cgrp_subsys);
>  
> +struct mem_cgroup *root_mem_cgroup __read_mostly;
> +
>  #define MEM_CGROUP_RECLAIM_RETRIES   5
> -static struct mem_cgroup *root_mem_cgroup __read_mostly;
> -struct cgroup_subsys_state *mem_cgroup_root_css __read_mostly;
>  
>  /* Whether the swap controller is active */
>  #ifdef CONFIG_MEMCG_SWAP
> @@ -4213,7 +4213,6 @@ mem_cgroup_css_alloc(struct cgroup_subsys_state 
> *parent_css)
>   /* root ? */
>   if (parent_css == NULL) {
>   root_mem_cgroup = memcg;
> - mem_cgroup_root_css = >css;
>   page_counter_init(>memory, NULL);
>   memcg->high = PAGE_COUNTER_MAX;
>   memcg->soft_limit = PAGE_COUNTER_MAX;
> -- 
> 2.6.1

-- 
Michal Hocko
SUSE Labs
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Re: [PATCH 2/8] mm: memcontrol: export root_mem_cgroup

[Michal Hocko]

On Thu 22-10-15 00:21:30, Johannes Weiner wrote:
> A later patch will need this symbol in files other than memcontrol.c,
> so export it now and replace mem_cgroup_root_css at the same time.
> 
> Signed-off-by: Johannes Weiner 

Acked-by: Michal Hocko 

> ---
>  include/linux/memcontrol.h | 3 ++-
>  mm/backing-dev.c   | 2 +-
>  mm/memcontrol.c| 5 ++---
>  3 files changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index 805da1f..19ff87b 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -275,7 +275,8 @@ struct mem_cgroup {
>   struct mem_cgroup_per_node *nodeinfo[0];
>   /* WARNING: nodeinfo must be the last member here */
>  };
> -extern struct cgroup_subsys_state *mem_cgroup_root_css;
> +
> +extern struct mem_cgroup *root_mem_cgroup;
>  
>  /**
>   * mem_cgroup_events - count memory events against a cgroup
> diff --git a/mm/backing-dev.c b/mm/backing-dev.c
> index 095b23b..73ab967 100644
> --- a/mm/backing-dev.c
> +++ b/mm/backing-dev.c
> @@ -702,7 +702,7 @@ static int cgwb_bdi_init(struct backing_dev_info *bdi)
>  
>   ret = wb_init(>wb, bdi, 1, GFP_KERNEL);
>   if (!ret) {
> - bdi->wb.memcg_css = mem_cgroup_root_css;
> + bdi->wb.memcg_css = _mem_cgroup->css;
>   bdi->wb.blkcg_css = blkcg_root_css;
>   }
>   return ret;
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index a8ccdbc..e54f434 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -76,9 +76,9 @@
>  struct cgroup_subsys memory_cgrp_subsys __read_mostly;
>  EXPORT_SYMBOL(memory_cgrp_subsys);
>  
> +struct mem_cgroup *root_mem_cgroup __read_mostly;
> +
>  #define MEM_CGROUP_RECLAIM_RETRIES   5
> -static struct mem_cgroup *root_mem_cgroup __read_mostly;
> -struct cgroup_subsys_state *mem_cgroup_root_css __read_mostly;
>  
>  /* Whether the swap controller is active */
>  #ifdef CONFIG_MEMCG_SWAP
> @@ -4213,7 +4213,6 @@ mem_cgroup_css_alloc(struct cgroup_subsys_state 
> *parent_css)
>   /* root ? */
>   if (parent_css == NULL) {
>   root_mem_cgroup = memcg;
> - mem_cgroup_root_css = >css;
>   page_counter_init(>memory, NULL);
>   memcg->high = PAGE_COUNTER_MAX;
>   memcg->soft_limit = PAGE_COUNTER_MAX;
> -- 
> 2.6.1

-- 
Michal Hocko
SUSE Labs
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[PATCH 2/8] mm: memcontrol: export root_mem_cgroup

[Johannes Weiner]

A later patch will need this symbol in files other than memcontrol.c,
so export it now and replace mem_cgroup_root_css at the same time.

Signed-off-by: Johannes Weiner 
---
 include/linux/memcontrol.h | 3 ++-
 mm/backing-dev.c   | 2 +-
 mm/memcontrol.c| 5 ++---
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 805da1f..19ff87b 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -275,7 +275,8 @@ struct mem_cgroup {
struct mem_cgroup_per_node *nodeinfo[0];
/* WARNING: nodeinfo must be the last member here */
 };
-extern struct cgroup_subsys_state *mem_cgroup_root_css;
+
+extern struct mem_cgroup *root_mem_cgroup;
 
 /**
  * mem_cgroup_events - count memory events against a cgroup
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 095b23b..73ab967 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -702,7 +702,7 @@ static int cgwb_bdi_init(struct backing_dev_info *bdi)
 
ret = wb_init(>wb, bdi, 1, GFP_KERNEL);
if (!ret) {
-   bdi->wb.memcg_css = mem_cgroup_root_css;
+   bdi->wb.memcg_css = _mem_cgroup->css;
bdi->wb.blkcg_css = blkcg_root_css;
}
return ret;
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index a8ccdbc..e54f434 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -76,9 +76,9 @@
 struct cgroup_subsys memory_cgrp_subsys __read_mostly;
 EXPORT_SYMBOL(memory_cgrp_subsys);
 
+struct mem_cgroup *root_mem_cgroup __read_mostly;
+
 #define MEM_CGROUP_RECLAIM_RETRIES 5
-static struct mem_cgroup *root_mem_cgroup __read_mostly;
-struct cgroup_subsys_state *mem_cgroup_root_css __read_mostly;
 
 /* Whether the swap controller is active */
 #ifdef CONFIG_MEMCG_SWAP
@@ -4213,7 +4213,6 @@ mem_cgroup_css_alloc(struct cgroup_subsys_state 
*parent_css)
/* root ? */
if (parent_css == NULL) {
root_mem_cgroup = memcg;
-   mem_cgroup_root_css = >css;
page_counter_init(>memory, NULL);
memcg->high = PAGE_COUNTER_MAX;
memcg->soft_limit = PAGE_COUNTER_MAX;
-- 
2.6.1

--
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Please read the FAQ at  http://www.tux.org/lkml/

[PATCH 2/8] mm: memcontrol: export root_mem_cgroup

[Johannes Weiner]

A later patch will need this symbol in files other than memcontrol.c,
so export it now and replace mem_cgroup_root_css at the same time.

Signed-off-by: Johannes Weiner 
---
 include/linux/memcontrol.h | 3 ++-
 mm/backing-dev.c   | 2 +-
 mm/memcontrol.c| 5 ++---
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 805da1f..19ff87b 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -275,7 +275,8 @@ struct mem_cgroup {
struct mem_cgroup_per_node *nodeinfo[0];
/* WARNING: nodeinfo must be the last member here */
 };
-extern struct cgroup_subsys_state *mem_cgroup_root_css;
+
+extern struct mem_cgroup *root_mem_cgroup;
 
 /**
  * mem_cgroup_events - count memory events against a cgroup
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 095b23b..73ab967 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -702,7 +702,7 @@ static int cgwb_bdi_init(struct backing_dev_info *bdi)
 
ret = wb_init(>wb, bdi, 1, GFP_KERNEL);
if (!ret) {
-   bdi->wb.memcg_css = mem_cgroup_root_css;
+   bdi->wb.memcg_css = _mem_cgroup->css;
bdi->wb.blkcg_css = blkcg_root_css;
}
return ret;
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index a8ccdbc..e54f434 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -76,9 +76,9 @@
 struct cgroup_subsys memory_cgrp_subsys __read_mostly;
 EXPORT_SYMBOL(memory_cgrp_subsys);
 
+struct mem_cgroup *root_mem_cgroup __read_mostly;
+
 #define MEM_CGROUP_RECLAIM_RETRIES 5
-static struct mem_cgroup *root_mem_cgroup __read_mostly;
-struct cgroup_subsys_state *mem_cgroup_root_css __read_mostly;
 
 /* Whether the swap controller is active */
 #ifdef CONFIG_MEMCG_SWAP
@@ -4213,7 +4213,6 @@ mem_cgroup_css_alloc(struct cgroup_subsys_state 
*parent_css)
/* root ? */
if (parent_css == NULL) {
root_mem_cgroup = memcg;
-   mem_cgroup_root_css = >css;
page_counter_init(>memory, NULL);
memcg->high = PAGE_COUNTER_MAX;
memcg->soft_limit = PAGE_COUNTER_MAX;
-- 
2.6.1

--
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Please read the FAQ at  http://www.tux.org/lkml/