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ARM SPE-based sampling can synthesize multiple events on a single instruction, as shown below. This would affect data type profiling statistics: Available samples 0 arm_spe_0/ts_enable=1,pa_enable=1,load_filter=1,store_filter=1,min_latency=30/ 0 dummy:u 84K l1d-miss 95K l1d-access 77K llc-miss 58K llc-access 9K tlb-miss 108K tlb-access 0 branch 13K remote-access 108K memory 108K instructions While 'perf report' provides an interactive menu for users to select a specific event to prevent duplicate counting, 'perf annotate' lacks such a mechanism. Consequently, it counts all instructions across these overlapping events, which inflates the profile and distorts the data type statistics. Although using the '--itrace' option can work around this issue (e.g.: perf annotate --data-type --stdio --itrace=i1i), it is inconvenient for users to specify this explicitly every time. To address this, introduce itrace_synth_opts.default_single_event_per_ip. Set this field to true when data type profiling is enabled and the user has not explicitly specified an itrace option. In itrace_synth_opts__set_default(), use this flag to default to synthesizing at most one event per IP (equivalent to --itrace=i1i) to prevent duplicate sample counts. Reviewed-by: Ian Rogers <irogers@google.com> Reviewed-by: Adrian Hunter <adrian.hunter@intel.com> Acked-by: Namhyung Kim <namhyung@kernel.org> Signed-off-by: Tengda Wu <wutengda@huaweicloud.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> |
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