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The vmstat threshold is 32 (MEMCG_CHARGE_BATCH), Actually the threshold
can be as big as MEMCG_CHARGE_BATCH * PAGE_SIZE. It still fits into s32.
So introducing struct batched_lruvec_stat to optimize memory usage.
The size of struct lruvec_stat is 304 bytes on 64 bits system. As it
is a per-cpu structure. So with this patch, we can save 304 / 2 * ncpu
bytes per-memcg per-node where ncpu is the number of the possible CPU.
If there are c memory cgroup (include dying cgroup) and n NUMA node in
the system. Finally, we can save (152 * ncpu * c * n) bytes.
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