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authorNamhyung Kim <namhyung@kernel.org>2023-08-25 17:25:50 +0200
committerArnaldo Carvalho de Melo <acme@redhat.com>2023-08-29 19:16:14 +0200
commitbaec60800dd4a379546f3ba311574d907a01a77d (patch)
tree7daa193bb1b98fe5b1286195293661b6eef2be09 /tools/lib
parentperf tools: Handle old data in PERF_RECORD_ATTR (diff)
downloadlinux-baec60800dd4a379546f3ba311574d907a01a77d.tar.xz
linux-baec60800dd4a379546f3ba311574d907a01a77d.zip
libperf: Add perf_record_header_attr_id()
The HEADER_ATTR record has an event attr followed by the id array. But perf data from a different version could have different size of attr. So it cannot just use event->attr.id to access the array. Let's add the perf_record_header_attr_id() macro to calculate the start of the array. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Ian Rogers <irogers@google.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: https://lore.kernel.org/r/20230825152552.112913-2-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/lib')
-rw-r--r--tools/lib/perf/include/perf/event.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/tools/lib/perf/include/perf/event.h b/tools/lib/perf/include/perf/event.h
index ba2dcf64f4e6..e563dd8c3628 100644
--- a/tools/lib/perf/include/perf/event.h
+++ b/tools/lib/perf/include/perf/event.h
@@ -151,6 +151,10 @@ struct perf_record_header_attr {
__u64 id[];
};
+/* Returns the pointer to id array based on the actual attr size. */
+#define perf_record_header_attr_id(evt) \
+ ((void *)&(evt)->attr.attr + (evt)->attr.attr.size)
+
enum {
PERF_CPU_MAP__CPUS = 0,
PERF_CPU_MAP__MASK = 1,