memcg: reduce memory size of mem_cgroup_events_index

Patch series "memcg: reduce memory consumption by memcg stats", v4.

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.  


This patch (of 8):

mem_cgroup_events_index is a translation table to get the right index of
the memcg relevant entry for the general vm_event_item.  At the moment, it
is defined as integer array.  However on a typical system the max entry of
vm_event_item (NR_VM_EVENT_ITEMS) is 113, so we don't need to use int as
storage type of the array.  For now just use int8_t as type and add a
BUILD_BUG_ON().

Another benefit of this change is that the translation table fits in 2
cachelines while previously it would require 8 cachelines (assuming 64
bytes cacheline).

Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Shakeel Butt <[email protected]>
Reviewed-by: Roman Gushchin <[email protected]>
Reviewed-by: Yosry Ahmed <[email protected]>
Reviewed-by: T.J. Mercier <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Muchun Song <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions