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Subject[tip:perf/urgent] perf annotate: Introduce annotation__scnprintf_samples_period() method
Commit-ID:  b213eac245aa2d29a3b9dd90f3b96ab182337ee8
Gitweb: https://git.kernel.org/tip/b213eac245aa2d29a3b9dd90f3b96ab182337ee8
Author: Arnaldo Carvalho de Melo <acme@redhat.com>
AuthorDate: Tue, 3 Apr 2018 15:19:47 -0300
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Tue, 3 Apr 2018 15:22:55 -0300

perf annotate: Introduce annotation__scnprintf_samples_period() method

To print a string using the total period (nr_events) and the number of
samples for a given annotation, i.e. for a given symbol, the counterpart
to hists__scnprintf_samples_period(), that is for all the samples in a
session (be it a live session, think 'perf top' or a perf.data file,
think 'perf report').

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Martin Liška <mliska@suse.cz>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=196935
Link: https://lkml.kernel.org/n/tip-goj2wu4fxutc8vd46mw3yg14@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/annotate.c | 38 ++++++++++++++++++++++++++++++++++++++
tools/perf/util/annotate.h | 12 ++++++++++++
2 files changed, 50 insertions(+)

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 3a428d7c59b9..b956bb7eabcf 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -17,6 +17,7 @@
#include "config.h"
#include "cache.h"
#include "symbol.h"
+#include "units.h"
#include "debug.h"
#include "annotate.h"
#include "evsel.h"
@@ -2597,6 +2598,43 @@ out_free_offsets:
return -1;
}

+int __annotation__scnprintf_samples_period(struct annotation *notes,
+ char *bf, size_t size,
+ struct perf_evsel *evsel,
+ bool show_freq)
+{
+ const char *ev_name = perf_evsel__name(evsel);
+ char ref[30] = " show reference callgraph, ";
+ char sample_freq_str[64] = "";
+ unsigned long nr_samples = 0;
+ int nr_members = 1;
+ bool enable_ref = false;
+ u64 nr_events = 0;
+ char unit;
+ int i;
+
+ if (perf_evsel__is_group_event(evsel))
+ nr_members = evsel->nr_members;
+
+ for (i = 0; i < nr_members; i++) {
+ struct sym_hist *ah = annotation__histogram(notes, evsel->idx + i);
+
+ nr_samples += ah->nr_samples;
+ nr_events += ah->period;
+ }
+
+ if (symbol_conf.show_ref_callgraph && strstr(ev_name, "call-graph=no"))
+ enable_ref = true;
+
+ if (show_freq)
+ scnprintf(sample_freq_str, sizeof(sample_freq_str), " %d Hz,", evsel->attr.sample_freq);
+
+ nr_samples = convert_unit(nr_samples, &unit);
+ return scnprintf(bf, size, "Samples: %lu%c of event%s '%s',%s%sEvent count (approx.): %" PRIu64,
+ nr_samples, unit, evsel->nr_members > 1 ? "s" : "",
+ ev_name, sample_freq_str, enable_ref ? ref : " ", nr_events);
+}
+
#define ANNOTATION__CFG(n) \
{ .name = #n, .value = &annotation__default_options.n, }

diff --git a/tools/perf/util/annotate.h b/tools/perf/util/annotate.h
index ff7e3df31efa..db8d09bea07e 100644
--- a/tools/perf/util/annotate.h
+++ b/tools/perf/util/annotate.h
@@ -151,6 +151,18 @@ double annotation_line__max_percent(struct annotation_line *al, struct annotatio
void annotation_line__write(struct annotation_line *al, struct annotation *notes,
struct annotation_write_ops *ops);

+int __annotation__scnprintf_samples_period(struct annotation *notes,
+ char *bf, size_t size,
+ struct perf_evsel *evsel,
+ bool show_freq);
+
+static inline int annotation__scnprintf_samples_period(struct annotation *notes,
+ char *bf, size_t size,
+ struct perf_evsel *evsel)
+{
+ return __annotation__scnprintf_samples_period(notes, bf, size, evsel, true);
+}
+
int disasm_line__scnprintf(struct disasm_line *dl, char *bf, size_t size, bool raw);
size_t disasm__fprintf(struct list_head *head, FILE *fp);
void symbol__calc_percent(struct symbol *sym, struct perf_evsel *evsel);
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