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At the moment, the amount of memory allocated for stats related structs in
the mem_cgroup corresponds to the size of enum node_stat_item. However
not all fields in enum node_stat_item have corresponding memcg stats. So,
let's use indirection mechanism similar to the one used for memcg vmstats
management.
For a given x86_64 config, the size of stats with and without patch is:
structs size in bytes w/o with
struct lruvec_stats 1128 648
struct lruvec_stats_percpu 752 432
struct memcg_vmstats 1832 1352
struct memcg_vmstats_percpu 1280 960
The memory savings are further compounded by the fact that these structs
are allocated for each cpu and for each node. To be precise, for each
memcg the memory saved would be:
Memory saved = ((21 * 3 * NR_NODES) + (21 * 2 * NR_NODES * NR_CPUS) +
(21 * 3) + (21 * 2 * NR_CPUS)) * sizeof(long)
Where 21 is the number of fields eliminated.
Link: https://lkml.kernel.org/r/20240501172617.678560-5-shakeel.butt@linux.dev
Signed-off-by: Shakeel Butt <shakeel.butt@linux.dev>
Reviewed-by: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: T.J. Mercier <tjmercier@google.com>
Cc: Yosry Ahmed <yosryahmed@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
ff48c71c26