linux-kernel - [PATCH 1/2] perf record: Intercept all events

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Date:	Fri, 15 Jan 2010 18:08:26 -0200
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>
Subject: [PATCH 1/2] perf record: Intercept all events

From: Arnaldo Carvalho de Melo <acme@...hat.com>

The event interception we need to to din 'perf record' to create a list
of all DSOs in PERF_RECORD_MMAP events wasn't seeing all events, make
sure that happens by checking size agains event_t->header.size.

Cc: Frédéric Weisbecker <fweisbec@...il.com>
Cc: Mike Galbraith <efault@....de>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Paul Mackerras <paulus@...ba.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-record.c |   28 ++++++++++++++++++----------
 1 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 614fa9a..7bb9ca1 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -113,16 +113,24 @@ static void write_output(void *buf, size_t size)
 
 static void write_event(event_t *buf, size_t size)
 {
-	/*
-	* Add it to the list of DSOs, so that when we finish this
-	 * record session we can pick the available build-ids.
-	 */
-	if (buf->header.type == PERF_RECORD_MMAP) {
-		struct list_head *head = &dsos__user;
-		if (buf->mmap.header.misc == 1)
-			head = &dsos__kernel;
-		__dsos__findnew(head, buf->mmap.filename);
-	}
+	size_t processed_size = buf->header.size;
+	event_t *ev = buf;
+
+	do {
+		/*
+		* Add it to the list of DSOs, so that when we finish this
+		 * record session we can pick the available build-ids.
+		 */
+		if (ev->header.type == PERF_RECORD_MMAP) {
+			struct list_head *head = &dsos__user;
+			if (ev->header.misc == 1)
+				head = &dsos__kernel;
+			__dsos__findnew(head, ev->mmap.filename);
+		}
+
+		ev = ((void *)ev) + ev->header.size;
+		processed_size += ev->header.size;
+	} while (processed_size < size);
 
 	write_output(buf, size);
 }
-- 
1.6.2.5

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