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Add a --workload-ctl=fifo:ctl-fifo[,ack-fifo] option for 'perf test -w'. When set, run_workload() opens the named FIFO, writes enable before invoking the builtin workload, writes disable before returning, and waits for ack responses when an ack FIFO is provided to ensure that the workload doesn't run until the events are enabled. This can be used to limit the scope of the recording to only the workload execution and avoid recording Perf setup and teardown code if Perf record is started with events disabled (-D 1). Assisted-by: Codex:GPT-5.5 Signed-off-by: James Clark <james.clark@linaro.org> Cc: Amir Ayupov <aaupov@meta.com> Cc: Ian Rogers <irogers@google.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Leo Yan <leo.yan@arm.com> Cc: Mike Leach <mike.leach@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paschalis Mpeis <Paschalis.Mpeis@arm.com> Cc: Shuah Khan <skhan@linuxfoundation.org> Cc: Suzuki Poulouse <suzuki.poulose@arm.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>