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    SubjectRe: [PATCH v5 07/14] mm: Allocate kernel pages to the right memcg
    On Tue, 16 Oct 2012, 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().
    >
    > [ v2: inverted test order to avoid a memcg_get leak,
    > free_accounted_pages simplification ]
    > [ v4: test for TIF_MEMDIE at newpage_charge ]
    >
    > Signed-off-by: Glauber Costa <glommer@parallels.com>
    > Acked-by: Michal Hocko <mhocko@suse.cz>
    > Acked-by: Mel Gorman <mgorman@suse.de>
    > Acked-by: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
    > CC: Christoph Lameter <cl@linux.com>
    > CC: Pekka Enberg <penberg@cs.helsinki.fi>
    > CC: Johannes Weiner <hannes@cmpxchg.org>
    > CC: Suleiman Souhlal <suleiman@google.com>
    > CC: Tejun Heo <tj@kernel.org>

    Acked-by: David Rientjes <rientjes@google.com>


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