perf cpumap: Add range data encoding

Often cpumaps encode a range of all CPUs, add a compact encoding that
doesn't require a bit mask or list of all CPUs.

Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com>
Cc: Athira Jajeev <atrajeev@linux.vnet.ibm.com>
Cc: Colin Ian King <colin.king@intel.com>
Cc: Dave Marchevsky <davemarchevsky@fb.com>
Cc: German Gomez <german.gomez@arm.com>
Cc: Gustavo A. R. Silva <gustavoars@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Kees Kook <keescook@chromium.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Riccardo Mancini <rickyman7@gmail.com>
Cc: Song Liu <songliubraving@fb.com>
Cc: Stephane Eranian <eranian@google.com>
Link: https://lore.kernel.org/r/20220614143353.1559597-7-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/tools/lib/perf/include/perf/event.h b/tools/lib/perf/include/perf/event.h
index e147e6183292..e282faf8fd75 100644
--- a/tools/lib/perf/include/perf/event.h
+++ b/tools/lib/perf/include/perf/event.h
@@ -153,6 +153,7 @@ struct perf_record_header_attr {
 enum {
 	PERF_CPU_MAP__CPUS = 0,
 	PERF_CPU_MAP__MASK = 1,
+	PERF_CPU_MAP__RANGE_CPUS = 2,
 };
 
 /*
@@ -195,6 +196,17 @@ struct perf_record_mask_cpu_map64 {
 #pragma GCC diagnostic ignored "-Wpacked"
 #pragma GCC diagnostic ignored "-Wattributes"
 
+/*
+ * An encoding of a CPU map for a range starting at start_cpu through to
+ * end_cpu. If any_cpu is 1, an any CPU (-1) value (aka dummy value) is present.
+ */
+struct perf_record_range_cpu_map {
+	__u8 any_cpu;
+	__u8 __pad;
+	__u16 start_cpu;
+	__u16 end_cpu;
+};
+
 struct __packed perf_record_cpu_map_data {
 	__u16			 type;
 	union {
@@ -204,6 +216,8 @@ struct __packed perf_record_cpu_map_data {
 		struct perf_record_mask_cpu_map32 mask32_data;
 		/* Used when type == PERF_CPU_MAP__MASK and long_size == 8. */
 		struct perf_record_mask_cpu_map64 mask64_data;
+		/* Used when type == PERF_CPU_MAP__RANGE_CPUS. */
+		struct perf_record_range_cpu_map range_cpu_data;
 	};
 };