doc: memcontrol: fix the obsolete content about force empty

We don't do page cache reparent anymore when offlining memcg, so update
force empty related content accordingly.

Reviewed-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Yang Shi 2019-01-16 07:51:35 +08:00 • committed by Jonathan Corbet
commit 053bc56938