Messages in this thread | | | Date | Tue, 23 Apr 2024 09:58:44 -0400 | From | Johannes Weiner <> | Subject | Re: [PATCH 1/4] mm: rearrange node_stat_item to put memcg stats at start |
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On Mon, Apr 22, 2024 at 10:18:23PM -0700, Shakeel Butt wrote: > At the moment the memcg stats are sized based on the size of enum > node_stat_item but not all fields in node_stat_item corresponds to memcg > stats. So, rearrage the contents of node_stat_item such that all the > memcg specific stats are at the top and then the later patches will make > sure that the memcg code will not waste space for non-memcg stats. > > Signed-off-by: Shakeel Butt <shakeel.butt@linux.dev>
This series is a great idea and the savings speak for themselves.
But rearranging and splitting vmstats along the memcg-nomemcg line seems like an undue burden on the non-memcg codebase and interface.
- It messes with user-visible /proc/vmstat ordering, and sets things up to do so on an ongoing basis as stats are added to memcg.
- It also separates related stats (like the workingset ones) in /proc/vmstat when memcg only accounts a subset.
Would it make more sense to have a translation table inside memcg? Like we have with memcg1_events.
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