linux-kernel - [PATCH 27/41] perf session: Flag if the event stream is entirely in memory

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Message-Id: <1405332185-4050-28-git-send-email-adrian.hunter@intel.com>
Date:	Mon, 14 Jul 2014 13:02:51 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: [PATCH 27/41] perf session: Flag if the event stream is entirely in memory

Flag if the event stream is a file that has been mmapped
in one go.

This is useful, for example, if a tool needs to keep an
event for later reference.  If the new flag is set, a
pointer to the event can be retained, otherwise the
event must be copied.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 tools/perf/util/session.c | 9 ++++++++-
 tools/perf/util/session.h | 3 +++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index c1abe6b..7b0fb03 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1319,8 +1319,10 @@ int __perf_session__process_events(struct perf_session *session,
 	ui_progress__init(&prog, file_size, "Processing events...");
 
 	mmap_size = MMAP_SIZE;
-	if (mmap_size > file_size)
+	if (mmap_size > file_size) {
 		mmap_size = file_size;
+		session->one_mmap = true;
+	}
 
 	memset(mmaps, 0, sizeof(mmaps));
 
@@ -1342,6 +1344,10 @@ remap:
 	mmaps[map_idx] = buf;
 	map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1);
 	file_pos = file_offset + head;
+	if (session->one_mmap) {
+		session->one_mmap_addr = buf;
+		session->one_mmap_offset = file_offset;
+	}
 
 more:
 	event = fetch_mmaped_event(session, head, mmap_size, buf);
@@ -1387,6 +1393,7 @@ out_err:
 	ui_progress__finish();
 	perf_session__warn_about_errors(session, tool);
 	perf_session_free_sample_buffers(session);
+	session->one_mmap = false;
 	return err;
 }
 
diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index 3140f8a..0321013 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -36,6 +36,9 @@ struct perf_session {
 	struct trace_event	tevent;
 	struct events_stats	stats;
 	bool			repipe;
+	bool			one_mmap;
+	void			*one_mmap_addr;
+	u64			one_mmap_offset;
 	struct ordered_samples	ordered_samples;
 	struct perf_data_file	*file;
 };
-- 
1.8.3.2

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