From ea8d0ed6eae37b01953a29bca98112d9e2507a84 Mon Sep 17 00:00:00 2001 From: Kan Liang Date: Tue, 2 Feb 2021 12:09:09 -0800 Subject: perf tools: Support PERF_SAMPLE_WEIGHT_STRUCT The new sample type, PERF_SAMPLE_WEIGHT_STRUCT, is an alternative of the PERF_SAMPLE_WEIGHT sample type. Users can apply either the PERF_SAMPLE_WEIGHT sample type or the PERF_SAMPLE_WEIGHT_STRUCT sample type to retrieve the sample weight, but they cannot apply both sample types simultaneously. The new sample type shares the same space as the PERF_SAMPLE_WEIGHT sample type. The lower 32 bits are exactly the same for both sample type. The higher 32 bits may be different for different architecture. Add arch specific arch_evsel__set_sample_weight() to set the new sample type for X86. Only store the lower 32 bits for the sample->weight if the new sample type is applied. In practice, no memory access could last than 4G cycles. No data will be lost. If the kernel doesn't support the new sample type. Fall back to the PERF_SAMPLE_WEIGHT sample type. There is no impact for other architectures. Committer notes: Fixup related to PERF_SAMPLE_CODE_PAGE_SIZE, present in acme/perf/core but not upstream yet. Signed-off-by: Kan Liang Cc: Andi Kleen Cc: Jin Yao Cc: Jiri Olsa Cc: Madhavan Srinivasan Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Stephane Eranian Link: http://lore.kernel.org/lkml/1612296553-21962-6-git-send-email-kan.liang@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/evsel.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'tools/perf/util/evsel.h') diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h index e25594494cf6..4e8e49fb7e9d 100644 --- a/tools/perf/util/evsel.h +++ b/tools/perf/util/evsel.h @@ -150,6 +150,7 @@ struct perf_missing_features { bool cgroup; bool data_page_size; bool code_page_size; + bool weight_struct; }; extern struct perf_missing_features perf_missing_features; @@ -244,6 +245,8 @@ void __evsel__reset_sample_bit(struct evsel *evsel, enum perf_event_sample_forma void evsel__set_sample_id(struct evsel *evsel, bool use_sample_identifier); +void arch_evsel__set_sample_weight(struct evsel *evsel); + int evsel__set_filter(struct evsel *evsel, const char *filter); int evsel__append_tp_filter(struct evsel *evsel, const char *filter); int evsel__append_addr_filter(struct evsel *evsel, const char *filter); -- cgit v1.2.3