Re: [PATCH v8 1/9] Basic kernel memory functionality for the Memory Controller

[Glauber Costa <glommer@xxxxxxxxxxxxx>]

On 12/08/2011 11:21 PM, KAMEZAWA Hiroyuki wrote:
> Hm, why you check val != parent->kmem_independent_accounting ?
>
> 	if (parent&&  parent->use_hierarchy)
> 		return -EINVAL;
> ?
>
> BTW, you didn't check this cgroup has children or not.
> I think
>
> 	if (this_cgroup->use_hierarchy&&
>               !list_empty(this_cgroup->childlen))
> 		return -EINVAL;

How about this?

        val = !!val;

        /*
         * This follows the same hierarchy restrictions than
         * mem_cgroup_hierarchy_write()
         */
        if (!parent || !parent->use_hierarchy) {
                if (list_empty(&cgroup->children))
                        memcg->kmem_independent_accounting = val;
                else
                        return -EBUSY;
        }
        else
                return -EINVAL;

        return 0;

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