linux-kernel - [RFC/PATCH 06/38] perf tools: Extend perf_evlist__mmap

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Date:	Fri,  2 Oct 2015 14:18:47 +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>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Stephane Eranian <eranian@...gle.com>,
	David Ahern <dsahern@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Adrian Hunter <adrian.hunter@...el.com>
Subject: [RFC/PATCH 06/38] perf tools: Extend perf_evlist__mmap_ex() to use track mmap

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>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/builtin-record.c | 2 +-
 tools/perf/util/evlist.c    | 6 ++++--
 tools/perf/util/evlist.h    | 2 +-
 3 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 33dc2eafe2b5..90b1237d2525 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -306,7 +306,7 @@ try_again:
 
 	if (perf_evlist__mmap_ex(evlist, opts->mmap_pages, false,
 				 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 25a9c3b5f473..61e83d930e92 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -1243,6 +1243,7 @@ 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
@@ -1255,13 +1256,14 @@ 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,
 			 bool overwrite, 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;
 	const struct thread_map *threads = evlist->threads;
 	struct mmap_params mp = {
 		.prot = PROT_READ | (overwrite ? 0 : PROT_WRITE),
+		.track_mmap = use_track_mmap,
 	};
 
 	if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist, mp.track_mmap) < 0)
@@ -1294,7 +1296,7 @@ int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages,
 int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
 		      bool overwrite)
 {
-	return perf_evlist__mmap_ex(evlist, pages, overwrite, 0, false);
+	return perf_evlist__mmap_ex(evlist, pages, overwrite, 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 fc53eb817c51..1ed7b7e8b968 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -144,7 +144,7 @@ int perf_evlist__parse_mmap_pages(const struct option *opt,
 
 int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages,
 			 bool overwrite, 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,
 		      bool overwrite);
 void perf_evlist__munmap(struct perf_evlist *evlist);
-- 
2.6.0

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