Re: [RFC] memcg: Add swappiness to cgroup2

Chris Down
2020-01-06T13:24:40Z

Michal Hocko writes:
>I am not really sure I agree here though. Swappiness has been
>traditionally more about workload because it has been believed that it
>is a preference of the workload whether the anonymous or disk based
>memory is more important. Whether this is a good interface is debatable
>of course but time has shown that it is extremely hard to tune.

Sure, it can theoretically be hardware- and workload-specific -- I don't think
we disagree here. The reason I suggest it's a generally hardware-specific
tunable rather than a workload-specific tunable is it's pretty rare to see
anyone who's meaningfully used it for workload-specific tuning :-)