linux-kernel - [PATCH 07/49] perf tools: Extend perf_evlist__mmap

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Date:   Tue,  9 Jan 2018 16:34:40 +0100
From:   Jiri Olsa <jolsa@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: [PATCH 07/49] perf tools: Extend perf_evlist__mmap_ex() to use track mmap

From: Namhyung Kim <namhyung@...nel.org>

The perf_evlist__mmap_ex function creates data and auxtrace mmaps and
optionally tracking mmaps for events now.  It'll be used for perf
record to save events in a separate files and build an index table.
Checking dummy tracking event in perf_evlist__mmap() alone is not
enough as users can specify a dummy event (like in keep tracking
testcase) without the index option.

Cc: Adrian Hunter <adrian.hunter@...el.com>
Link: http://lkml.kernel.org/n/tip-hche6reuz4unv1614kj7lihz@git.kernel.org
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/perf/builtin-record.c | 2 +-
 tools/perf/util/evlist.c    | 7 ++++---
 tools/perf/util/evlist.h    | 2 +-
 3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index a792758e9aa3..385aa9fba282 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -306,7 +306,7 @@ static int record__mmap_evlist(struct record *rec,
 
 	if (perf_evlist__mmap_ex(evlist, opts->mmap_pages,
 				 opts->auxtrace_mmap_pages,
-				 opts->auxtrace_snapshot_mode) < 0) {
+				 opts->auxtrace_snapshot_mode, false) < 0) {
 		if (errno == EPERM) {
 			pr_err("Permission error mapping pages.\n"
 			       "Consider increasing "
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index bb2c74865ba3..635b0938c200 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -1094,6 +1094,7 @@ int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str,
  * @overwrite: overwrite older events?
  * @auxtrace_pages - auxtrace map length in pages
  * @auxtrace_overwrite - overwrite older auxtrace data?
+ * @use_track_mmap: use another mmaps to track meta events
  *
  * If @overwrite is %false the user needs to signal event consumption using
  * perf_mmap__write_tail().  Using perf_evlist__mmap_read() does this
@@ -1106,7 +1107,7 @@ int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str,
  */
 int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages,
 			 unsigned int auxtrace_pages,
-			 bool auxtrace_overwrite)
+			 bool auxtrace_overwrite, bool use_track_mmap)
 {
 	struct perf_evsel *evsel;
 	const struct cpu_map *cpus = evlist->cpus;
@@ -1117,7 +1118,7 @@ int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages,
 	 * So &mp should not be passed through const pointer.
 	 */
 	struct mmap_params mp = {
-		.track_mmap = false,
+		.track_mmap = use_track_mmap,
 	};
 
 	if (!evlist->mmap) {
@@ -1162,7 +1163,7 @@ int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages,
 
 int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages)
 {
-	return perf_evlist__mmap_ex(evlist, pages, 0, false);
+	return perf_evlist__mmap_ex(evlist, pages, 0, false, false);
 }
 
 int perf_evlist__create_maps(struct perf_evlist *evlist, struct target *target)
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index bbfe523b0509..4f7b7f68704b 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -175,7 +175,7 @@ unsigned long perf_event_mlock_kb_in_pages(void);
 
 int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages,
 			 unsigned int auxtrace_pages,
-			 bool auxtrace_overwrite);
+			 bool auxtrace_overwrite, bool use_track_mmap);
 int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages);
 void perf_evlist__munmap(struct perf_evlist *evlist);
 
-- 
2.13.6