sched_ext: Implement event counter infrastructure

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Collect the statistics of specific types of behavior in the sched_ext core,
which are not easily visible but still interesting to an scx scheduler.

An event type is defined in 'struct scx_event_stats.' When an event occurs,
its counter is accumulated using 'scx_add_event()' and '__scx_add_event()'
to per-CPU 'struct scx_event_stats' for efficiency. 'scx_bpf_events()'
aggregates all the per-CPU counters and exposes a system-wide counters.

For convenience and readability of the code, 'scx_agg_event()' and
'scx_dump_event()' are provided.

The collected events can be observed after a BPF scheduler is unloaded
beforea new BPF scheduler is loaded so the per-CPU 'struct scx_event_stats'
are reset.

Signed-off-by: Changwoo Min <changwoo@igalia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

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Changwoo Min 2025-01-31 16:09:28 +09:00 • committed by Tejun Heo

parent 337d1b354a

commit 17103b8504

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kernel/sched/ext.c

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