perf tools: Merge trace.info content into perf.data
This drops the trace.info file and move its contents into the
common perf.data file.
This is done by creating a new trace_info section into this file. A
user of perf headers needs to call perf_header__set_trace_info() to
save the trace meta informations into the perf.data file.
A file created by perf after his patch is unsupported by previous
version because the size of the headers have increased.
That said, it's two new fields that have been added in the end of
the headers, and those could be ignored by previous versions if
they just handled the dynamic header size and then ignore the
unknow part. The offsets guarantee the compatibility. We'll do a
-stable fix for that.
But current previous versions handle the header size using its
static size, not dynamic, then it's not backward compatible with
trace records.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <20091006213643.GA5343@nowhere>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 494f8c7..59af03d 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -17,7 +17,6 @@
#include "util/header.h"
#include "util/event.h"
#include "util/debug.h"
-#include "util/trace-event.h"
#include <unistd.h>
#include <sched.h>
@@ -566,17 +565,17 @@
else
header = perf_header__new();
-
if (raw_samples) {
- read_tracing_data(attrs, nr_counters);
+ perf_header__set_trace_info();
} else {
for (i = 0; i < nr_counters; i++) {
if (attrs[i].sample_type & PERF_SAMPLE_RAW) {
- read_tracing_data(attrs, nr_counters);
+ perf_header__set_trace_info();
break;
}
}
}
+
atexit(atexit_header);
if (!system_wide) {
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 4470f25..1887138 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -1634,7 +1634,6 @@
uint32_t size;
char *buf;
- trace_report();
register_idle_thread(&threads, &last_match);
input = open(input_name, O_RDONLY);
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index d573d4e..d9abb4a 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -149,7 +149,6 @@
uint32_t size;
char *buf;
- trace_report();
register_idle_thread(&threads, &last_match);
input = open(input_name, O_RDONLY);
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index e306857..212fade 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -5,6 +5,8 @@
#include "util.h"
#include "header.h"
+#include "../perf.h"
+#include "trace-event.h"
/*
* Create new perf.data header attribute:
@@ -62,6 +64,8 @@
self->data_offset = 0;
self->data_size = 0;
+ self->trace_info_offset = 0;
+ self->trace_info_size = 0;
return self;
}
@@ -145,8 +149,16 @@
struct perf_file_section attrs;
struct perf_file_section data;
struct perf_file_section event_types;
+ struct perf_file_section trace_info;
};
+static int trace_info;
+
+void perf_header__set_trace_info(void)
+{
+ trace_info = 1;
+}
+
static void do_write(int fd, void *buf, size_t size)
{
while (size) {
@@ -198,6 +210,23 @@
if (events)
do_write(fd, events, self->event_size);
+ if (trace_info) {
+ static int trace_info_written;
+
+ /*
+ * Write it only once
+ */
+ if (!trace_info_written) {
+ self->trace_info_offset = lseek(fd, 0, SEEK_CUR);
+ read_tracing_data(fd, attrs, nr_counters);
+ self->trace_info_size = lseek(fd, 0, SEEK_CUR) -
+ self->trace_info_offset;
+ trace_info_written = 1;
+ } else {
+ lseek(fd, self->trace_info_offset +
+ self->trace_info_size, SEEK_SET);
+ }
+ }
self->data_offset = lseek(fd, 0, SEEK_CUR);
@@ -217,6 +246,10 @@
.offset = self->event_offset,
.size = self->event_size,
},
+ .trace_info = {
+ .offset = self->trace_info_offset,
+ .size = self->trace_info_size,
+ },
};
lseek(fd, 0, SEEK_SET);
@@ -290,6 +323,15 @@
do_read(fd, events, f_header.event_types.size);
event_count = f_header.event_types.size / sizeof(struct perf_trace_event_type);
}
+
+ self->trace_info_offset = f_header.trace_info.offset;
+ self->trace_info_size = f_header.trace_info.size;
+
+ if (self->trace_info_size) {
+ lseek(fd, self->trace_info_offset, SEEK_SET);
+ trace_report(fd);
+ }
+
self->event_offset = f_header.event_types.offset;
self->event_size = f_header.event_types.size;
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index a2916b6..30aee51 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -21,6 +21,8 @@
u64 data_size;
u64 event_offset;
u64 event_size;
+ u64 trace_info_offset;
+ u64 trace_info_size;
};
struct perf_header *perf_header__read(int fd);
@@ -40,7 +42,7 @@
u64 perf_header__sample_type(struct perf_header *header);
struct perf_event_attr *
perf_header__find_attr(u64 id, struct perf_header *header);
-
+void perf_header__set_trace_info(void);
struct perf_header *perf_header__new(void);
diff --git a/tools/perf/util/trace-event-info.c b/tools/perf/util/trace-event-info.c
index af4b057..831052d 100644
--- a/tools/perf/util/trace-event-info.c
+++ b/tools/perf/util/trace-event-info.c
@@ -496,14 +496,12 @@
return path.next;
}
-void read_tracing_data(struct perf_event_attr *pattrs, int nb_events)
+void read_tracing_data(int fd, struct perf_event_attr *pattrs, int nb_events)
{
char buf[BUFSIZ];
struct tracepoint_path *tps;
- output_fd = open(output_file, O_WRONLY | O_CREAT | O_TRUNC | O_LARGEFILE, 0644);
- if (output_fd < 0)
- die("creating file '%s'", output_file);
+ output_fd = fd;
buf[0] = 23;
buf[1] = 8;
diff --git a/tools/perf/util/trace-event-read.c b/tools/perf/util/trace-event-read.c
index 1b5c847..44292e0 100644
--- a/tools/perf/util/trace-event-read.c
+++ b/tools/perf/util/trace-event-read.c
@@ -458,9 +458,8 @@
return data;
}
-void trace_report(void)
+void trace_report(int fd)
{
- const char *input_file = "trace.info";
char buf[BUFSIZ];
char test[] = { 23, 8, 68 };
char *version;
@@ -468,9 +467,7 @@
int show_funcs = 0;
int show_printk = 0;
- input_fd = open(input_file, O_RDONLY);
- if (input_fd < 0)
- die("opening '%s'\n", input_file);
+ input_fd = fd;
read_or_die(buf, 3);
if (memcmp(buf, test, 3) != 0)
diff --git a/tools/perf/util/trace-event.h b/tools/perf/util/trace-event.h
index 5f59a39..da77e07 100644
--- a/tools/perf/util/trace-event.h
+++ b/tools/perf/util/trace-event.h
@@ -158,7 +158,7 @@
void parse_set_info(int nr_cpus, int long_sz);
-void trace_report(void);
+void trace_report(int fd);
void *malloc_or_die(unsigned int size);
@@ -244,6 +244,6 @@
raw_field_value(struct event *event, const char *name, void *data);
void *raw_field_ptr(struct event *event, const char *name, void *data);
-void read_tracing_data(struct perf_event_attr *pattrs, int nb_events);
+void read_tracing_data(int fd, struct perf_event_attr *pattrs, int nb_events);
#endif /* __PERF_TRACE_EVENTS_H */
