tree c04f019844dacfafdd61ad2f97bb1a0a845066ee
parent df381975463996178d685f6ef7d3555c5f887201
author Michal Hocko <mhocko@suse.cz> 1396910264 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1396913756 -0700

memcg: do not replicate get_mem_cgroup_from_mm in __mem_cgroup_try_charge

__mem_cgroup_try_charge duplicates get_mem_cgroup_from_mm for charges
which came without a memcg.  The only reason seems to be a tiny
optimization when css_tryget is not called if the charge can be consumed
from the stock.  Nevertheless css_tryget is very cheap since it has been
reworked to use per-cpu counting so this optimization doesn't give us
anything these days.

So let's drop the code duplication so that the code is more readable.

Signed-off-by: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>