perf: Convert perf header build_ids into build_id events

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>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: fweisbec@gmail.com
Cc: rostedt@goodmis.org
Cc: k-keiichi@bx.jp.nec.com
Cc: acme@ghostprotocols.net
LKML-Reference: <1270184365-8281-9-git-send-email-tzanussi@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

5 files changed, 107 insertions, 1 deletions

diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index b896a177ea4..e5740ea140a 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 c6874ecc90b..628173ba689 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -986,3 +986,93 @@ 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 3ed3d98c81d..4214e237565 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 1516c40d47a..0fdf3ebef1e 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -206,6 +206,8 @@ 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 const char *event__name[] = {
@@ -222,6 +224,7 @@ 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];
@@ -332,6 +335,7 @@ 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,
 };
 
@@ -380,6 +384,8 @@ 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 0739ebbbf9f..0ac14d42dc2 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -47,7 +47,8 @@ struct perf_event_ops {
                  unthrottle,
                  attr,
                  event_type,
-                 tracing_data;
+                 tracing_data,
+                 build_id;
 };
 
 struct perf_session *perf_session__new(const char *filename, int mode, bool force);