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5d1ab659fb
Add flag that disables affinity behavior. Using sched_setaffinity() to place a perf thread on a CPU can avoid certain interprocessor interrupts but may introduce a delay due to the scheduling, particularly on loaded machines. Add a command line option to disable the behavior. This behavior is less present in other tools like `perf record`, as it uses a ring buffer and doesn't make repeated system calls. Signed-off-by: Ian Rogers <irogers@google.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Andres Freund <andres@anarazel.de> Cc: Dapeng Mi <dapeng1.mi@linux.intel.com> Cc: Dr. David Alan Gilbert <linux@treblig.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Clark <james.clark@linaro.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Falcon <thomas.falcon@intel.com> Cc: Thomas Richter <tmricht@linux.ibm.com> Cc: Yang Li <yang.lee@linux.alibaba.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>