mm: memcg: add cache line padding to mem_cgroup_per_node
Memcg v1-specific fields serve a buffer function between read-mostly and update often parts of the mem_cgroup_per_node structure. If CONFIG_MEMCG_V1 is not set and these fields are not present, an explicit cacheline padding is needed. Link: https://lkml.kernel.org/r/20240701185932.704807-2-roman.gushchin@linux.dev Signed-off-by: Roman Gushchin <roman.gushchin@linux.dev> Suggested-by: Shakeel Butt <shakeel.butt@linux.dev> Acked-by: Shakeel Butt <shakeel.butt@linux.dev> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Muchun Song <muchun.song@linux.dev> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -95,14 +95,16 @@ struct mem_cgroup_per_node {
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#ifdef CONFIG_MEMCG_V1
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/*
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* Memcg-v1 only stuff in middle as buffer between read mostly fields
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* and update often fields to avoid false sharing. Once v1 stuff is
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* moved in a separate struct, an explicit padding is needed.
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* and update often fields to avoid false sharing. If v1 stuff is
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* not present, an explicit padding is needed.
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*/
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struct rb_node tree_node; /* RB tree node */
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unsigned long usage_in_excess;/* Set to the value by which */
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/* the soft limit is exceeded*/
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bool on_tree;
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#else
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CACHELINE_PADDING(_pad1_);
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#endif
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/* Fields which get updated often at the end. */
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