linux-kernel - [PATCH 07/38] perf tools: Handle indexed data file properly

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Date:	Tue,  3 Mar 2015 12:07:19 +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>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <andi@...stfloor.org>,
	David Ahern <dsahern@...il.com>
Subject: [PATCH 07/38] perf tools: Handle indexed data file properly

When perf detects data file has index table, process header part first
and then rest data files in a row.  Note that the indexed sample data is
recorded for each cpu/thread separately, it's already ordered with
respect to themselves so no need to use the ordered event queue
interface.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/util/session.c | 62 ++++++++++++++++++++++++++++++++++++++---------
 tools/perf/util/session.h |  5 ++++
 2 files changed, 55 insertions(+), 12 deletions(-)

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index e4f166981ff0..00cd1ad427be 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1300,11 +1300,10 @@ fetch_mmaped_event(struct perf_session *session,
 #define NUM_MMAPS 128
 #endif
 
-static int __perf_session__process_events(struct perf_session *session,
+static int __perf_session__process_events(struct perf_session *session, int fd,
 					  u64 data_offset, u64 data_size,
 					  u64 file_size, struct perf_tool *tool)
 {
-	int fd = perf_data_file__fd(session->file);
 	u64 head, page_offset, file_offset, file_pos, size;
 	int err, mmap_prot, mmap_flags, map_idx = 0;
 	size_t	mmap_size;
@@ -1327,7 +1326,9 @@ static int __perf_session__process_events(struct perf_session *session,
 	mmap_size = MMAP_SIZE;
 	if (mmap_size > file_size) {
 		mmap_size = file_size;
-		session->one_mmap = true;
+
+		if (!perf_session__has_index(session))
+			session->one_mmap = true;
 	}
 
 	memset(mmaps, 0, sizeof(mmaps));
@@ -1400,29 +1401,66 @@ static int __perf_session__process_events(struct perf_session *session,
 	err = ordered_events__flush(session, tool, OE_FLUSH__FINAL);
 out_err:
 	ui_progress__finish();
-	perf_tool__warn_about_errors(tool, &session->evlist->stats);
 	ordered_events__free(&session->ordered_events);
 	session->one_mmap = false;
 	return err;
 }
 
+static int __perf_session__process_indexed_events(struct perf_session *session,
+						  struct perf_tool *tool)
+{
+	struct perf_data_file *file = session->file;
+	u64 size = perf_data_file__size(file);
+	int err = 0, i;
+
+	for (i = 0; i < (int)session->header.nr_index; i++) {
+		struct perf_file_section *index = &session->header.index[i];
+
+		if (!index->size)
+			continue;
+
+		/*
+		 * For indexed data file, samples are processed for
+		 * each cpu/thread so it's already ordered.  However
+		 * meta-events at index 0 should be processed in order.
+		 */
+		if (i > 0)
+			tool->ordered_events = false;
+
+		err = __perf_session__process_events(session,
+						     perf_data_file__fd(file),
+						     index->offset, index->size,
+						     size, tool);
+		if (err < 0)
+			break;
+	}
+
+	perf_tool__warn_about_errors(tool, &session->evlist->stats);
+	return err;
+}
+
 int perf_session__process_events(struct perf_session *session,
 				 struct perf_tool *tool)
 {
-	u64 size = perf_data_file__size(session->file);
+	struct perf_data_file *file = session->file;
+	u64 size = perf_data_file__size(file);
 	int err;
 
 	if (perf_session__register_idle_thread(session) == NULL)
 		return -ENOMEM;
 
-	if (!perf_data_file__is_pipe(session->file))
-		err = __perf_session__process_events(session,
-						     session->header.data_offset,
-						     session->header.data_size,
-						     size, tool);
-	else
-		err = __perf_session__process_pipe_events(session, tool);
+	if (perf_data_file__is_pipe(file))
+		return __perf_session__process_pipe_events(session, tool);
+	if (perf_session__has_index(session))
+		return __perf_session__process_indexed_events(session, tool);
+
+	err = __perf_session__process_events(session,
+					     perf_data_file__fd(file),
+					     session->header.data_offset,
+					     session->header.data_size,
+					     size, tool);
 
+	perf_tool__warn_about_errors(tool, &session->evlist->stats);
 	return err;
 }
 
diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index fe859f379ca7..aff0d2b4cc0b 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -137,4 +137,9 @@ int perf_event__synthesize_id_index(struct perf_tool *tool,
 				    struct perf_evlist *evlist,
 				    struct machine *machine);
 
+static inline bool perf_session__has_index(struct perf_session *session)
+{
+	return perf_header__has_feat(&session->header, HEADER_DATA_INDEX);
+}
+
 #endif /* __PERF_SESSION_H */
-- 
2.2.2

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