mm/memcg: move cgroup high memory limit setting into struct page_counter
High memory limit is currently recorded directly in struct mem_cgroup. We are about to add a high limit for swap, move the field to struct page_counter and add some helpers. Signed-off-by: NJakub Kicinski <kuba@kernel.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Reviewed-by: NShakeel Butt <shakeelb@google.com> Acked-by: NJohannes Weiner <hannes@cmpxchg.org> Cc: Chris Down <chris@chrisdown.name> Cc: Hugh Dickins <hughd@google.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Tejun Heo <tj@kernel.org> Link: http://lkml.kernel.org/r/20200527195846.102707-4-kuba@kernel.orgSigned-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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