• Vladimir Davydov's avatar
    sl[au]b: charge slabs to kmemcg explicitly · 5dfb4175
    Vladimir Davydov authored
    We have only a few places where we actually want to charge kmem so
    instead of intruding into the general page allocation path with
    __GFP_KMEMCG it's better to explictly charge kmem there.  All kmem
    charges will be easier to follow that way.
    This is a step towards removing __GFP_KMEMCG.  It removes __GFP_KMEMCG
    from memcg caches' allocflags.  Instead it makes slab allocation path
    call memcg_charge_kmem directly getting memcg to charge from the cache's
    memcg params.
    This also eliminates any possibility of misaccounting an allocation
    going from one memcg's cache to another memcg, because now we always
    charge slabs against the memcg the cache belongs to.  That's why this
    patch removes the big comment to memcg_kmem_get_cache.
    Signed-off-by: default avatarVladimir Davydov <vdavydov@parallels.com>
    Acked-by: default avatarGreg Thelen <gthelen@google.com>
    Cc: Johannes Weiner <hannes@cmpxchg.org>
    Acked-by: default avatarMichal Hocko <mhocko@suse.cz>
    Cc: Glauber Costa <glommer@gmail.com>
    Cc: Christoph Lameter <cl@linux-foundation.org>
    Cc: Pekka Enberg <penberg@kernel.org>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>