On Tue 2020-11-24 13:47 +0000, Aaron Tomlin wrote: > On Tue, 24 Nov 2020 at 13:36, Michal Hocko <mhocko@xxxxxxxx> wrote: > > This like any other user visible interface would be a much easier sell > > if there was a clear usecase to justify it. I do not see anything > > controversial about exporting such a value but my general take is that > > we are only adding new interface when existing ones are insufficient. A > > performance might be a very good reason but that would really require to > > come with some real life numbers. Michal, > Fair enough and understood. > > At this stage, I unfortunately do not have such supporting data. This was only > useful in an isolated situation. Having said this, I thought that the > aforementioned interface would be helpful to others, in particular, given the > known limitation. Furthermore, I can see that this is already provided via /proc/cgroups (see proc_cgroupstats_show()). As such, another possibility: the proposed interface could reliably produce the difference between the maximum permitted memory-controlled cgroup count and the used count (i.e. the remaining memory cgroup count, from root); albeit, I doubt that this would be particularly useful to others i.e., the use-case would be rather limited. Kind regards, -- Aaron Tomlin
