sched_ext: Implement scx_bpf_consume_task()
Implement scx_bpf_consume_task() which allows consuming arbitrary tasks on
the DSQ in any order while iterating in the dispatch path.
scx_qmap is updated to implement periodic dumping of the shared DSQ and a
rather silly prioritization mechanism to demonstrate the use of DSQ
iteration and selective consumption.
v2: - BPF now allows kfuncs to take pointer to iterators. Drop the now
unnecessary hack. This makes things noticeably cleaner.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: David Vernet <dvernet@meta.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: bpf@vger.kernel.org
4 files changed
