Most of the memory overhead of a memcg object is due to memcg stats maintained by the kernel. Since stats updates happen in performance critical codepaths, the stats are maintained per-cpu and numa specific stats are maintained per-node * per-cpu. This drastically increase the overhead on large machines i.e. large of CPUs and multiple numa nodes. This patch series tries to reduce the overhead by at least not allocating the memory for stats which are not memcg specific. Shakeel Butt (4): mm: rearrange node_stat_item to put memcg stats at start memcg: reduce memory for the lruvec and memcg stats memcg: use proper type for mod_memcg_state memcg: restrict __mod_memcg_lruvec_state to memcg stats include/linux/memcontrol.h | 25 +++++++++++++------------ include/linux/mmzone.h | 29 +++++++++++++++++------------ mm/memcontrol.c | 12 +++++++----- mm/vmstat.c | 24 ++++++++++++------------ 4 files changed, 49 insertions(+), 41 deletions(-) -- 2.43.0
