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Dumping the callchains from breakpoint events with perf gives strange results: 3.75% perf [kernel] [k] _raw_read_unlock | --- _raw_read_unlock perf_callchain perf_prepare_sample __perf_event_overflow perf_swevent_overflow perf_swevent_add perf_bp_event hw_breakpoint_exceptions_notify notifier_call_chain __atomic_notifier_call_chain atomic_notifier_call_chain notify_die do_debug debug munmap We are infected with all the debug stack. Like the nmi stack, the debug stack is undesired as it is part of the profiling path, not helpful for the user. Ignore it. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: "K. Prasad" <prasad@linux.vnet.ibm.com> |
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