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The new field th_ctx->rq_tot_peak contains the computed peak run queue length averaged over the last 512 calls. This is computed when entering process_runnable_tasks. It will not take into account new tasks that are created or woken up during this round nor those which are evicted, which is the reason why we're using a peak measurement to increase chances to observe transient high values. Tests have shown that 512 samples are good to provide a relatively smooth average measurement while still fading away in a matter of milliseconds at high loads. Since this value is only updated once per round, it cannot be used as a statistic and shouldn't be exposed, it's only for internal use (self-regulation). |
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