[Devel] Re: [PATCH 2/2] memcg: dirty pages instrumentation

[Andrea Righi]

On Mon, Feb 22, 2010 at 09:32:21AM +0900, KAMEZAWA Hiroyuki wrote:
> > -	if (vm_dirty_bytes)
> > -		dirty = DIV_ROUND_UP(vm_dirty_bytes, PAGE_SIZE);
> > +	dirty_bytes = mem_cgroup_dirty_bytes();
> > +	if (dirty_bytes)
> > +		dirty = DIV_ROUND_UP(dirty_bytes, PAGE_SIZE);
> >  	else {
> >  		int dirty_ratio;
> 
> you use local value. But, if hierarchila accounting used, memcg->dirty_bytes
> should be got from root-of-hierarchy memcg.
> 
> I have no objection if you add a pointer as
> 	memcg->subhierarchy_root
> to get root of hierarchical accounting. But please check problem of hierarchy, again.

Right, it won't work with hierarchy. I'll fix also considering the
hierarchy case.

Thanks for your review.

-Andrea
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