linux-kernel - [PATCH v2 1/5] perf_event: fix getting point

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Message-ID: <4B30C347.4080503@cn.fujitsu.com>
Date:	Tue, 22 Dec 2009 21:01:59 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Paul Mackerras <paulus@...ba.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 1/5] perf_event: fix getting point

The point that got by raw_field_ptr() is point to @data offset not
tracepoint saved.

Introduce raw_field_array() to get array data

Changlog v1->v2:
- fix the typo 'arry' -> 'array' that is pointed out by Frederic Weisbecker

- use '(void *)(unsigned long)value' instead of 'memcpy()' as
  Frederic Weisbecker's suggestion

Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
---
 tools/perf/builtin-sched.c          |    3 +--
 tools/perf/util/trace-event-parse.c |   23 ++++++++++++++++++++---
 tools/perf/util/trace-event.h       |    3 +++
 3 files changed, 24 insertions(+), 5 deletions(-)

diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 80209df..c083e88 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -630,8 +630,7 @@ static void test_calibrations(void)
 
 #define FILL_ARRAY(ptr, array, event, data)			\
 do {								\
-	void *__array = raw_field_ptr(event, #array, data);	\
-	memcpy(ptr.array, __array, sizeof(ptr.array));	\
+	raw_field_array(event, #array, data, ptr.array, sizeof(ptr.array));\
 } while(0)
 
 #define FILL_COMMON_FIELDS(ptr, event, data)			\
diff --git a/tools/perf/util/trace-event-parse.c b/tools/perf/util/trace-event-parse.c
index c5c32be..037bbe3 100644
--- a/tools/perf/util/trace-event-parse.c
+++ b/tools/perf/util/trace-event-parse.c
@@ -840,7 +840,7 @@ static int event_read_fields(struct event *event, struct format_field **fields)
 			field->flags |= FIELD_IS_ARRAY;
 
 			type = read_token(&token);
-		        while (strcmp(token, "]") != 0) {
+			while (strcmp(token, "]") != 0) {
 				if (last_type == EVENT_ITEM &&
 				    type == EVENT_ITEM)
 					len = 2;
@@ -1919,13 +1919,30 @@ raw_field_value(struct event *event, const char *name, void *data)
 
 void *raw_field_ptr(struct event *event, const char *name, void *data)
 {
+	unsigned long long value;
+
+	value = raw_field_value(event, name, data);
+
+	if (!value)
+		return NULL;
+
+	return (void *)(unsigned long)value;
+}
+
+unsigned long long
+raw_field_array(struct event *event, const char *name, void *data,
+	       void *array, int array_size)
+{
+	int len;
 	struct format_field *field;
 
 	field = find_any_field(event, name);
 	if (!field)
-		return NULL;
+		return 0ULL;
 
-	return data + field->offset;
+	len = min(array_size, field->size);
+	memcpy(array, data + field->offset, len);
+	return len;
 }
 
 static int get_common_info(const char *type, int *offset, int *size)
diff --git a/tools/perf/util/trace-event.h b/tools/perf/util/trace-event.h
index 6ad4056..c3b5c39 100644
--- a/tools/perf/util/trace-event.h
+++ b/tools/perf/util/trace-event.h
@@ -255,6 +255,9 @@ unsigned long long read_size(void *ptr, int size);
 unsigned long long
 raw_field_value(struct event *event, const char *name, void *data);
 void *raw_field_ptr(struct event *event, const char *name, void *data);
+unsigned long long
+raw_field_array(struct event *event, const char *name, void *data,
+	       void *array, int array_size);
 unsigned long long eval_flag(const char *flag);
 
 int read_tracing_data(int fd, struct perf_event_attr *pattrs, int nb_events);
-- 
1.6.1.2


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