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Commit d64d01a1 authored by Alexey Dobriyan's avatar Alexey Dobriyan Committed by Linus Torvalds
Browse files

seq_file: account everything to kmemcg 

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.

Link: http://lkml.kernel.org/r/20180310085252.GB17121@avx2


Signed-off-by: default avatarAlexey Dobriyan <adobriyan@gmail.com>
Reviewed-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Acked-by: default avatarMichal Hocko <mhocko@suse.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Glauber Costa <glommer@gmail.com>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 09652320

fs/seq_file.c

+4 −4
Original line number Diff line number Diff line
@@ -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);

}