On Thu, Feb 16, 2023 at 01:49:22AM +0800, Kairui Song <ryncsn@xxxxxxxxx> wrote: > With rootcg: > 55718.9 op/s (unpatched) compared to 55862.2 (patched) > With 5 levels: > 49975.5 op/s (unpatched) compared to 50778.5 op/s (patched) > > Previous tests are a bit biased since I only run the test for 100 * 3 > times, or maybe it is sensitive to some random kernel structure > changes. > > But I ignored one important thing in my previous test, that the > performance actually drops heavily with deeper levers of cgroups: > With 8 levels: > 48902.4 op/s (unpatched) compared to 47476.6 op/s (patched) > With 50 levels of cgroup: > 25605.7375 op/s (unpatched) compared to 20417.275 op/s (patched) IIUC, one could also interpret this as the parent caching within psi_group is effective especially with deep hierarchies. I'd say practical hierarchies are below 10 levels deep. But yeah, the averaged results aren't so impressive. Thanks for sharing your insights, Michal
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