On Mon, Feb 22, 2010 at 09:22:42AM +0900, KAMEZAWA Hiroyuki wrote:
[..]
> > +static int mem_cgroup_dirty_bytes_write(struct cgroup *cgrp, struct cftype
> > *cft,
> > + u64 val)
> > +{
> > + struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
> > + struct mem_cgroup *parent;
> > +
> > + if (cgrp->parent == NULL)
> > + return -EINVAL;
> > +
> > + parent = mem_cgroup_from_cont(cgrp->parent);
> > +
> > + cgroup_lock();
> > +
> > + /* If under hierarchy, only empty-root can set this value */
> > + if ((parent->use_hierarchy) ||
> > + (memcg->use_hierarchy && !list_empty(&cgrp->children))) {
> > + cgroup_unlock();
> > + return -EINVAL;
> > + }
>
> Okay, then, only hierarchy root can set the value.
> Please descirbe this kind of important things in patch description.
>
Hi Andrea,
Why can only root of the hierarchy set set dirty_bytes value? In this
case, a child cgroup's amount of dirty pages will be controlled by
dirty_ratio?
Thanks
Vivek
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