Re: [PATCH 07/11] mm: Allocate kernel pages to the right memcg

[Glauber Costa]

On 06/25/2012 10:07 PM, Tejun Heo wrote:
> On Mon, Jun 25, 2012 at 06:15:24PM +0400, Glauber Costa wrote:
> > When a process tries to allocate a page with the __GFP_KMEMCG flag,
> > the page allocator will call the corresponding memcg functions to
> > validate the allocation. Tasks in the root memcg can always proceed.
> >
> > To avoid adding markers to the page - and a kmem flag that would
> > necessarily follow, as much as doing page_cgroup lookups for no
> > reason, whoever is marking its allocations with __GFP_KMEMCG flag
> > is responsible for telling the page allocator that this is such an
> > allocation at free_pages() time. This is done by the invocation of
> > __free_accounted_pages() and free_accounted_pages().
>
> Shouldn't we be documenting that in the code somewhere, preferably in
> the function comments?
I can certainly do that.


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