[PATCH 09/10] perf report: Display build id fails stats

From: Jiri Olsa
Date: Tue Jun 22 2021 - 11:39:59 EST


Adding support to display build id fails in --stats option:

# perf report --stat

Aggregated stats:
TOTAL events: 104
COMM events: 2 ( 1.9%)
....
BUILD_ID fails: 4 (14.3%)

This stat is displayed only for session recorded with --buildid-mmap
and contains HEADER_BUILD_ID_MMAP header feature.

We process all MMAP2 events and in case it does not contain build id
and it should - it's regular file, we count the BUILD_ID fail and
display it.

Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
---
tools/perf/builtin-report.c | 35 +++++++++++++++++++++++++++++++++++
tools/perf/util/map.h | 15 +++++++++++++++
2 files changed, 50 insertions(+)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index bc5c393021dc..b5c03bcc4395 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -13,6 +13,7 @@
#include "util/annotate.h"
#include "util/color.h"
#include "util/dso.h"
+#include "util/vdso.h"
#include <linux/list.h>
#include <linux/rbtree.h>
#include <linux/err.h>
@@ -100,6 +101,8 @@ struct report {
u64 nr_entries;
u64 queue_size;
u64 total_cycles;
+ u64 buildid_fails;
+ u64 buildid_total;
int socket_filter;
DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
struct branch_type_stat brtype_stat;
@@ -729,10 +732,36 @@ static int count_sample_event(struct perf_tool *tool __maybe_unused,
return 0;
}

+static int count_buildid_fails(struct perf_tool *tool,
+ union perf_event *event,
+ struct perf_sample *sample __maybe_unused,
+ struct machine *machine __maybe_unused)
+{
+ struct report *rep = container_of(tool, struct report, tool);
+ struct perf_record_mmap2 *mmap2 = &event->mmap2;
+
+ /* No build id should be generated */
+ if (!is_buildid_memory(mmap2->filename))
+ return 0;
+
+ rep->buildid_total++;
+
+ /* The build id should be generated, but wasn't - fault. */
+ if (!(mmap2->header.misc & PERF_RECORD_MISC_MMAP_BUILD_ID))
+ rep->buildid_fails++;
+
+ return 0;
+}
+
static void stats_setup(struct report *rep)
{
memset(&rep->tool, 0, sizeof(rep->tool));
rep->tool.sample = count_sample_event;
+
+ if (perf_header__has_feat(&rep->session->header,
+ HEADER_BUILD_ID_MMAP))
+ rep->tool.mmap2 = count_buildid_fails;
+
rep->tool.no_warn = true;
}

@@ -742,6 +771,12 @@ static int stats_print(struct report *rep)

perf_session__fprintf_nr_events(session, stdout, rep->skip_empty);
evlist__fprintf_nr_events(session->evlist, stdout, rep->skip_empty);
+
+ if (rep->buildid_fails) {
+ fprintf(stdout, "%23s: %10" PRIu64 " (%4.1f%%)\n", "BUILD_ID fails",
+ rep->buildid_fails,
+ 100.0 * rep->buildid_fails / rep->buildid_total);
+ }
return 0;
}

diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
index d32f5b28c1fb..9b96ebed412d 100644
--- a/tools/perf/util/map.h
+++ b/tools/perf/util/map.h
@@ -10,6 +10,7 @@
#include <string.h>
#include <stdbool.h>
#include <linux/types.h>
+#include "vdso.h"

struct dso;
struct maps;
@@ -186,4 +187,18 @@ static inline int is_no_dso_memory(const char *filename)
!strncmp(filename, "/SYSV", 5) ||
!strcmp(filename, "[heap]");
}
+
+static inline int is_vsyscall_memory(const char *filename)
+{
+ return !strcmp(filename, "[vsyscall]");
+}
+
+static inline int is_buildid_memory(const char *filename)
+{
+ return !is_anon_memory(filename) &&
+ !is_vdso_map(filename) &&
+ !is_no_dso_memory(filename) &&
+ !is_vsyscall_memory(filename);
+}
+
#endif /* __PERF_MAP_H */
--
2.31.1