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Date: Wed, 24 Dec 2014 16:14:58 +0900
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Ingo Molnar <mingo@...nel.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Jiri Olsa <jolsa@...hat.com>,
LKML <linux-kernel@...r.kernel.org>,
David Ahern <dsahern@...il.com>,
Stephane Eranian <eranian@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>,
Andi Kleen <andi@...stfloor.org>,
Frederic Weisbecker <fweisbec@...il.com>
Subject: [PATCH 02/37] perf record: Use a software dummy event to track task/mmap events
Prepend a software dummy event into evlist to track task/comm/mmap
events separately. This is a preparation of multi-file/thread support
which will come later.
Cc: Adrian Hunter <adrian.hunter@...el.com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
tools/perf/builtin-record.c | 3 +++
tools/perf/perf.h | 1 +
tools/perf/util/evlist.c | 38 ++++++++++++++++++++++++++++++++++++++
tools/perf/util/evlist.h | 1 +
tools/perf/util/evsel.h | 15 +++++++++++++++
5 files changed, 58 insertions(+)
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 8648c6d3003d..aa5fa6aabb31 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -862,6 +862,9 @@ int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)
goto out_symbol_exit;
}
+ if (rec->opts.multi_file)
+ perf_evlist__prepend_dummy(rec->evlist);
+
if (rec->opts.target.tid && !rec->opts.no_inherit_set)
rec->opts.no_inherit = true;
diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index 1dabb8553499..37284eb47b56 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -53,6 +53,7 @@ struct record_opts {
bool sample_time;
bool period;
bool sample_intr_regs;
+ bool multi_file;
unsigned int freq;
unsigned int mmap_pages;
unsigned int user_freq;
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index cfbe2b99b9aa..72dff295237e 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -193,6 +193,44 @@ int perf_evlist__add_default(struct perf_evlist *evlist)
return -ENOMEM;
}
+int perf_evlist__prepend_dummy(struct perf_evlist *evlist)
+{
+ struct perf_event_attr attr = {
+ .type = PERF_TYPE_SOFTWARE,
+ .config = PERF_COUNT_SW_DUMMY,
+ };
+ struct perf_evsel *evsel, *pos;
+
+ event_attr_init(&attr);
+
+ evsel = perf_evsel__new(&attr);
+ if (evsel == NULL)
+ goto error;
+
+ /* use strdup() because free(evsel) assumes name is allocated */
+ evsel->name = strdup("dummy");
+ if (!evsel->name)
+ goto error_free;
+
+ list_for_each_entry(pos, &evlist->entries, node) {
+ pos->idx += 1;
+ pos->tracking = false;
+ }
+
+ list_add(&evsel->node, &evlist->entries);
+ evsel->idx = 0;
+ evsel->tracking = true;
+
+ if (!evlist->nr_entries++)
+ perf_evlist__set_id_pos(evlist);
+
+ return 0;
+error_free:
+ perf_evsel__delete(evsel);
+error:
+ return -ENOMEM;
+}
+
static int perf_evlist__add_attrs(struct perf_evlist *evlist,
struct perf_event_attr *attrs, size_t nr_attrs)
{
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index 649b0c597283..b974bddf6b8b 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -67,6 +67,7 @@ void perf_evlist__delete(struct perf_evlist *evlist);
void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry);
int perf_evlist__add_default(struct perf_evlist *evlist);
+int perf_evlist__prepend_dummy(struct perf_evlist *evlist);
int __perf_evlist__add_default_attrs(struct perf_evlist *evlist,
struct perf_event_attr *attrs, size_t nr_attrs);
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 38622747d130..5b45eea63043 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -331,6 +331,21 @@ static inline bool perf_evsel__is_function_event(struct perf_evsel *evsel)
#undef FUNCTION_EVENT
}
+/**
+ * perf_evsel__is_dummy_tracking - Return whether given evsel is a dummy
+ * event for tracking meta events only
+ *
+ * @evsel - evsel selector to be tested
+ *
+ * Return %true if event is a dummy tracking event
+ */
+static inline bool perf_evsel__is_dummy_tracking(struct perf_evsel *evsel)
+{
+ return evsel->attr.type == PERF_TYPE_SOFTWARE &&
+ evsel->attr.config == PERF_COUNT_SW_DUMMY &&
+ evsel->attr.task == 1 && evsel->idx == 0;
+}
+
struct perf_attr_details {
bool freq;
bool verbose;
--
2.1.3
--
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