Re: [PATCH 2/2] seq_file: account everything

2018-03-16 Thread Michal Hocko 
On Sat 10-03-18 11:52:52, Alexey Dobriyan wrote:
> All it takes to open a file and read 1 byte from it.
> 
> seq_file will be allocated along with any private allocations,
> and more importantly seq file buffer which is 1 page by default.
 
OOM badness heuristic will not know about this memory when choosing an
oom victim so we might kill a wrong victim which is not all that great
but at least the consumption will be contained within a memcg which
sounds like the sufficient protection for now. This is the case
basically for all kmem charges...

The seq file life time should be bound to a process life time so this is
OK.

> Signed-off-by: Alexey Dobriyan 

Acked-by: Michal Hocko 

> ---
> 
>  fs/seq_file.c |8 
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> --- a/fs/seq_file.c
> +++ b/fs/seq_file.c
> @@ -29,7 +29,7 @@ static void seq_set_overflow(struct seq_file *m)
>  
>  static void *seq_buf_alloc(unsigned long size)
>  {
> - return kvmalloc(size, GFP_KERNEL);
> + return kvmalloc(size, GFP_KERNEL_ACCOUNT);
>  }
>  
>  /**
> @@ -566,7 +566,7 @@ static void single_stop(struct seq_file *p, void *v)
>  int single_open(struct file *file, int (*show)(struct seq_file *, void *),
>   void *data)
>  {
> - struct seq_operations *op = kmalloc(sizeof(*op), GFP_KERNEL);
> + struct seq_operations *op = kmalloc(sizeof(*op), GFP_KERNEL_ACCOUNT);
>   int res = -ENOMEM;
>  
>   if (op) {
> @@ -628,7 +628,7 @@ void *__seq_open_private(struct file *f, const struct 
> seq_operations *ops,
>   void *private;
>   struct seq_file *seq;
>  
> - private = kzalloc(psize, GFP_KERNEL);
> + private = kzalloc(psize, GFP_KERNEL_ACCOUNT);
>   if (private == NULL)
>   goto out;
>  
> @@ -1112,5 +1112,5 @@ EXPORT_SYMBOL(seq_hlist_next_percpu);
>  
>  void __init seq_file_init(void)
>  {
> - seq_file_cache = KMEM_CACHE(seq_file, SLAB_PANIC);
> + seq_file_cache = KMEM_CACHE(seq_file, SLAB_ACCOUNT|SLAB_PANIC);
>  }

-- 
Michal Hocko
SUSE Labs

Re: [PATCH 2/2] seq_file: account everything

2018-03-16 Thread Michal Hocko 
On Sat 10-03-18 11:52:52, Alexey Dobriyan wrote:
> All it takes to open a file and read 1 byte from it.
> 
> seq_file will be allocated along with any private allocations,
> and more importantly seq file buffer which is 1 page by default.
 
OOM badness heuristic will not know about this memory when choosing an
oom victim so we might kill a wrong victim which is not all that great
but at least the consumption will be contained within a memcg which
sounds like the sufficient protection for now. This is the case
basically for all kmem charges...

The seq file life time should be bound to a process life time so this is
OK.

> Signed-off-by: Alexey Dobriyan 

Acked-by: Michal Hocko 

> ---
> 
>  fs/seq_file.c |8 
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> --- a/fs/seq_file.c
> +++ b/fs/seq_file.c
> @@ -29,7 +29,7 @@ static void seq_set_overflow(struct seq_file *m)
>  
>  static void *seq_buf_alloc(unsigned long size)
>  {
> - return kvmalloc(size, GFP_KERNEL);
> + return kvmalloc(size, GFP_KERNEL_ACCOUNT);
>  }
>  
>  /**
> @@ -566,7 +566,7 @@ static void single_stop(struct seq_file *p, void *v)
>  int single_open(struct file *file, int (*show)(struct seq_file *, void *),
>   void *data)
>  {
> - struct seq_operations *op = kmalloc(sizeof(*op), GFP_KERNEL);
> + struct seq_operations *op = kmalloc(sizeof(*op), GFP_KERNEL_ACCOUNT);
>   int res = -ENOMEM;
>  
>   if (op) {
> @@ -628,7 +628,7 @@ void *__seq_open_private(struct file *f, const struct 
> seq_operations *ops,
>   void *private;
>   struct seq_file *seq;
>  
> - private = kzalloc(psize, GFP_KERNEL);
> + private = kzalloc(psize, GFP_KERNEL_ACCOUNT);
>   if (private == NULL)
>   goto out;
>  
> @@ -1112,5 +1112,5 @@ EXPORT_SYMBOL(seq_hlist_next_percpu);
>  
>  void __init seq_file_init(void)
>  {
> - seq_file_cache = KMEM_CACHE(seq_file, SLAB_PANIC);
> + seq_file_cache = KMEM_CACHE(seq_file, SLAB_ACCOUNT|SLAB_PANIC);
>  }

-- 
Michal Hocko
SUSE Labs

[PATCH 2/2] seq_file: account everything

2018-03-10 Thread Alexey Dobriyan 
All it takes to open a file and read 1 byte from it.

seq_file will be allocated along with any private allocations,
and more importantly seq file buffer which is 1 page by default.

Signed-off-by: Alexey Dobriyan 
---

 fs/seq_file.c |8 
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -29,7 +29,7 @@ static void seq_set_overflow(struct seq_file *m)
 
 static void *seq_buf_alloc(unsigned long size)
 {
-   return kvmalloc(size, GFP_KERNEL);
+   return kvmalloc(size, GFP_KERNEL_ACCOUNT);
 }
 
 /**
@@ -566,7 +566,7 @@ static void single_stop(struct seq_file *p, void *v)
 int single_open(struct file *file, int (*show)(struct seq_file *, void *),
void *data)
 {
-   struct seq_operations *op = kmalloc(sizeof(*op), GFP_KERNEL);
+   struct seq_operations *op = kmalloc(sizeof(*op), GFP_KERNEL_ACCOUNT);
int res = -ENOMEM;
 
if (op) {
@@ -628,7 +628,7 @@ void *__seq_open_private(struct file *f, const struct 
seq_operations *ops,
void *private;
struct seq_file *seq;
 
-   private = kzalloc(psize, GFP_KERNEL);
+   private = kzalloc(psize, GFP_KERNEL_ACCOUNT);
if (private == NULL)
goto out;
 
@@ -1112,5 +1112,5 @@ EXPORT_SYMBOL(seq_hlist_next_percpu);
 
 void __init seq_file_init(void)
 {
-   seq_file_cache = KMEM_CACHE(seq_file, SLAB_PANIC);
+   seq_file_cache = KMEM_CACHE(seq_file, SLAB_ACCOUNT|SLAB_PANIC);
 }

[PATCH 2/2] seq_file: account everything

2018-03-10 Thread Alexey Dobriyan 
All it takes to open a file and read 1 byte from it.

seq_file will be allocated along with any private allocations,
and more importantly seq file buffer which is 1 page by default.

Signed-off-by: Alexey Dobriyan 
---

 fs/seq_file.c |8 
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -29,7 +29,7 @@ static void seq_set_overflow(struct seq_file *m)
 
 static void *seq_buf_alloc(unsigned long size)
 {
-   return kvmalloc(size, GFP_KERNEL);
+   return kvmalloc(size, GFP_KERNEL_ACCOUNT);
 }
 
 /**
@@ -566,7 +566,7 @@ static void single_stop(struct seq_file *p, void *v)
 int single_open(struct file *file, int (*show)(struct seq_file *, void *),
void *data)
 {
-   struct seq_operations *op = kmalloc(sizeof(*op), GFP_KERNEL);
+   struct seq_operations *op = kmalloc(sizeof(*op), GFP_KERNEL_ACCOUNT);
int res = -ENOMEM;
 
if (op) {
@@ -628,7 +628,7 @@ void *__seq_open_private(struct file *f, const struct 
seq_operations *ops,
void *private;
struct seq_file *seq;
 
-   private = kzalloc(psize, GFP_KERNEL);
+   private = kzalloc(psize, GFP_KERNEL_ACCOUNT);
if (private == NULL)
goto out;
 
@@ -1112,5 +1112,5 @@ EXPORT_SYMBOL(seq_hlist_next_percpu);
 
 void __init seq_file_init(void)
 {
-   seq_file_cache = KMEM_CACHE(seq_file, SLAB_PANIC);
+   seq_file_cache = KMEM_CACHE(seq_file, SLAB_ACCOUNT|SLAB_PANIC);
 }