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Subject[RFC PATCH 6/7] perf: convert perf header build_ids into build_id events
Date
Bypasses the build_id perf header code and replaces it with a
synthesized event and processing function that accomplishes the same
thing, used when reading/writing perf data to/from a pipe.

Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
---
tools/perf/builtin-record.c | 15 ++++++-
tools/perf/util/event.h | 2 +
tools/perf/util/header.c | 90 +++++++++++++++++++++++++++++++++++++++++++
tools/perf/util/header.h | 7 +++
tools/perf/util/session.c | 7 +++
tools/perf/util/session.h | 3 +-
6 files changed, 120 insertions(+), 4 deletions(-)
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 95bccdc..0ab9ffa 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -405,10 +405,19 @@ static int process_buildids(void)

static void atexit_header(void)
{
- session->header.data_size += bytes_written;
+ if (!pipe_output) {
+ session->header.data_size += bytes_written;

- process_buildids();
- perf_header__write(&session->header, output, true);
+ process_buildids();
+ perf_header__write(&session->header, output, true);
+ } else {
+ int err;
+
+ err = event__synthesize_build_ids(process_synthesized_event,
+ session);
+ if (err < 0)
+ pr_err("Couldn't synthesize build ids.\n");
+ }
}

static int __cmd_record(int argc, const char **argv)
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index c111358..0705e75 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -87,6 +87,7 @@ enum perf_header_event_type { /* above any possible kernel type */
PERF_RECORD_HEADER_ATTR = 64,
PERF_RECORD_HEADER_EVENT_TYPE = 65,
PERF_RECORD_HEADER_TRACING_DATA = 66,
+ PERF_RECORD_HEADER_BUILD_ID = 67,
PERF_RECORD_HEADER_MAX
};

@@ -125,6 +126,7 @@ typedef union event_union {
struct attr_event attr;
struct event_type_event event_type;
struct tracing_data_event tracing_data;
+ struct build_id_event build_id;
} event_t;

struct events_stats {
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 5910aee..c380264 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1007,3 +1007,93 @@ int event__process_tracing_data(event_t *self,

return size_read + padding;
}
+
+int event__synthesize_build_id(struct dso *pos, u16 misc,
+ event__handler_t process,
+ struct perf_session *session)
+{
+ event_t ev;
+ size_t len;
+ int err = 0;
+
+ if (!pos->hit)
+ return err;
+
+ memset(&ev, 0, sizeof(ev));
+
+ len = pos->long_name_len + 1;
+ len = ALIGN(len, NAME_ALIGN);
+ memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id));
+ ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
+ ev.build_id.header.misc = misc;
+ ev.build_id.header.size = sizeof(ev.build_id) + len;
+ memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
+
+ err = process(&ev, session);
+
+ return err;
+}
+
+static int __event_synthesize_build_ids(struct list_head *head, u16 misc,
+ event__handler_t process,
+ struct perf_session *session)
+{
+ struct dso *pos;
+
+ dsos__for_each_with_build_id(pos, head) {
+ int err;
+ if (!pos->hit)
+ continue;
+
+ err = event__synthesize_build_id(pos, misc, process, session);
+ if (err < 0)
+ return err;
+ }
+
+ return 0;
+}
+
+int event__synthesize_build_ids(event__handler_t process,
+ struct perf_session *session)
+{
+ int err;
+
+ if (!dsos__read_build_ids(true))
+ return 0;
+
+ err = __event_synthesize_build_ids(&dsos__kernel,
+ PERF_RECORD_MISC_KERNEL,
+ process, session);
+ if (err == 0)
+ err = __event_synthesize_build_ids(&dsos__user,
+ PERF_RECORD_MISC_USER,
+ process, session);
+
+ if (err < 0) {
+ pr_debug("failed to synthesize build ids\n");
+ return err;
+ }
+
+ dsos__cache_build_ids();
+
+ return 0;
+}
+
+int event__process_build_id(event_t *self,
+ struct perf_session *session __unused)
+{
+ struct list_head *head = &dsos__user;
+ struct dso *dso;
+
+ if (self->build_id.header.misc & PERF_RECORD_MISC_KERNEL)
+ head = &dsos__kernel;
+
+ dso = __dsos__findnew(head, self->build_id.filename);
+ if (dso != NULL) {
+ dso__set_build_id(dso, &self->build_id.build_id);
+ if (head == &dsos__kernel && self->build_id.filename[0] == '[')
+ dso->kernel = 1;
+ }
+
+ return 0;
+}
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index a83f375..cfb807f 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -118,4 +118,11 @@ int event__synthesize_tracing_data(int fd, struct perf_event_attr *pattrs,
int event__process_tracing_data(event_t *self,
struct perf_session *session);

+int event__synthesize_build_id(struct dso *pos, u16 misc,
+ event__handler_t process,
+ struct perf_session *session);
+int event__synthesize_build_ids(event__handler_t process,
+ struct perf_session *session);
+int event__process_build_id(event_t *self, struct perf_session *session);
+
#endif /* __PERF_HEADER_H */
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 74e9646..679274d 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -215,6 +215,8 @@ static void perf_event_ops__fill_defaults(struct perf_event_ops *handler)
handler->event_type = process_event_stub;
if (handler->tracing_data == NULL)
handler->tracing_data = process_event_stub;
+ if (handler->build_id == NULL)
+ handler->build_id = process_event_stub;
}

static int process_event_stop(event_t *event __used,
@@ -238,6 +240,7 @@ void perf_event_ops__fill_stop(struct perf_event_ops *handler)
handler->attr = process_event_stop;
handler->event_type = process_event_stop;
handler->tracing_data = process_event_stop;
+ handler->build_id = process_event_stop;
}

static const char *event__name[] = {
@@ -254,6 +257,7 @@ static const char *event__name[] = {
[PERF_RECORD_HEADER_ATTR] = "ATTR",
[PERF_RECORD_HEADER_EVENT_TYPE] = "EVENT_TYPE",
[PERF_RECORD_HEADER_TRACING_DATA] = "TRACING_DATA",
+ [PERF_RECORD_HEADER_BUILD_ID] = "BUILD_ID",
};

unsigned long event__total[PERF_RECORD_HEADER_MAX];
@@ -364,6 +368,7 @@ static event__swap_op event__swap_ops[] = {
[PERF_RECORD_HEADER_ATTR] = event__attr_swap,
[PERF_RECORD_HEADER_EVENT_TYPE] = event__event_type_swap,
[PERF_RECORD_HEADER_TRACING_DATA] = event__tracing_data_swap,
+ [PERF_RECORD_HEADER_BUILD_ID] = NULL,
[PERF_RECORD_HEADER_MAX] = NULL,
};

@@ -412,6 +417,8 @@ static int perf_session__process_event(struct perf_session *self,
/* setup for reading amidst mmap */
lseek(self->fd, offset + head, SEEK_SET);
return ops->tracing_data(event, self);
+ case PERF_RECORD_HEADER_BUILD_ID:
+ return ops->build_id(event, self);
default:
self->unknown_events++;
return -1;
diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index a648af0..87821a9 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -46,7 +46,8 @@ struct perf_event_ops {
unthrottle,
attr,
event_type,
- tracing_data;
+ tracing_data,
+ build_id;
};

/*
--
1.6.4.GIT


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