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?

-- 
tejun

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