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Add an option to control the synthesizing behavior. --synth <no|all|task|mmap|cgroup> Fine-tune event synthesis: default=all This can be useful when we know it doesn't need some synthesis like in a specific usecase and/or when using pipe: $ perf record -a --all-cgroups --synth cgroup -o- sleep 1 | \ > perf report -i- -s cgroup Committer notes: Added a clarification to the man page entry for --synth that this is about pre-existing threads. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Acked-by: Jiri Olsa <jolsa@redhat.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Ian Rogers <irogers@google.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jin Yao <yao.jin@linux.intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: https //lore.kernel.org/r/20210811044658.1313391-2-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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