Re: [PATCH mmotm] memcg: add interface to reset limits

[Andrew Morton]

On Fri, 5 Jun 2009 22:22:45 +0900
Daisuke Nishimura <d-nishimura@xxxxxxxxxxxxxxxxx> wrote:

> We don't have interface to reset mem.limit or memsw.limit now.
> 
> This patch allows to reset mem.limit or memsw.limit when they are
> being set to -1.
> 
> ...
>
> @@ -133,6 +133,16 @@ int res_counter_memparse_write_strategy(const char *buf,
>  					unsigned long long *res)
>  {
>  	char *end;
> +
> +	/* return RESOURCE_MAX(unlimited) if "-1" is specified */
> +	if (*buf == '-') {
> +		*res = simple_strtoull(buf + 1, &end, 10);
> +		if (*res != 1 || *end != '\0')
> +			return -EINVAL;
> +		*res = RESOURCE_MAX;
> +		return 0;
> +	}

The test for (*end != '\0') would be unneeded if strict_strtoull() had
been used.


> +
>  	/* FIXME - make memparse() take const char* args */
>  	*res = memparse((char *)buf, &end);
>  	if (*end != '\0')
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