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Subject[RFC v2][PATCH 05/11] perf: convert perf header attrs into attr events
Date
Bypasses the attr 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.

Making the attrs into events allows them to be streamed over a pipe
along with the rest of the header data (in later patches). It also
paves the way to allowing events to be added and removed from perf
sessions dynamically.

Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
---
tools/perf/builtin-record.c | 10 +++++
tools/perf/builtin-report.c | 1 +
tools/perf/builtin-trace.c | 1 +
tools/perf/util/event.h | 10 +++++-
tools/perf/util/header.c | 79 +++++++++++++++++++++++++++++++++++++++++++
tools/perf/util/header.h | 8 ++++
tools/perf/util/session.c | 26 ++++++++++++++
tools/perf/util/session.h | 3 +-
8 files changed, 136 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 0723fa1..1f0abe2 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -585,6 +585,16 @@ static int __cmd_record(int argc, const char **argv)

post_processing_offset = lseek(output, 0, SEEK_CUR);

+ if (pipe_output) {
+ err = event__synthesize_attrs(&session->header,
+ process_synthesized_event,
+ session);
+ if (err < 0) {
+ pr_err("Couldn't synthesize attrs.\n");
+ return err;
+ }
+ }
+
err = event__synthesize_kernel_mmap(process_synthesized_event,
session, "_text");
if (err < 0) {
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index a104121..0bb5d85 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -265,6 +265,7 @@ static struct perf_event_ops event_ops = {
.fork = event__process_task,
.lost = event__process_lost,
.read = process_read_event,
+ .attr = event__process_attr,
};

extern volatile int session_done;
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 718fddd..bb28973 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -104,6 +104,7 @@ static int process_sample_event(event_t *event, struct perf_session *session)
static struct perf_event_ops event_ops = {
.sample = process_sample_event,
.comm = event__process_comm,
+ .attr = event__process_attr,
};

extern volatile int session_done;
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index 03cdfd9..8a2ded3 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -84,7 +84,14 @@ struct build_id_event {
};

enum perf_header_event_type { /* above any possible kernel type */
- PERF_RECORD_HEADER_MAX = 64,
+ PERF_RECORD_HEADER_ATTR = 64,
+ PERF_RECORD_HEADER_MAX
+};
+
+struct attr_event {
+ struct perf_event_header header;
+ struct perf_event_attr attr;
+ u64 id[];
};

typedef union event_union {
@@ -96,6 +103,7 @@ typedef union event_union {
struct lost_event lost;
struct read_event read;
struct sample_event sample;
+ struct attr_event attr;
} event_t;

struct events_stats {
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 8d05337..e361739 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -807,3 +807,82 @@ perf_header__find_attr(u64 id, struct perf_header *header)

return NULL;
}
+
+int event__synthesize_attr(struct perf_event_attr *attr, u16 ids, u64 *id,
+ event__handler_t process,
+ struct perf_session *session)
+{
+ event_t *ev;
+ size_t size;
+ int err;
+
+ size = sizeof(struct perf_event_attr);
+ size = ALIGN(size, sizeof(u64));
+ size += sizeof(struct perf_event_header);
+ size += ids * sizeof(u64);
+
+ ev = malloc(size);
+
+ ev->attr.attr = *attr;
+ memcpy(ev->attr.id, id, ids * sizeof(u64));
+
+ ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
+ ev->attr.header.size = size;
+
+ err = process(ev, session);
+
+ free(ev);
+
+ return err;
+}
+
+int event__synthesize_attrs(struct perf_header *self,
+ event__handler_t process,
+ struct perf_session *session)
+{
+ struct perf_header_attr *attr;
+ int i, err = 0;
+
+ for (i = 0; i < self->attrs; i++) {
+ attr = self->attr[i];
+
+ err = event__synthesize_attr(&attr->attr, attr->ids, attr->id,
+ process, session);
+ if (err) {
+ pr_debug("failed to create perf header attribute\n");
+ return err;
+ }
+ }
+
+ return err;
+}
+
+int event__process_attr(event_t *self, struct perf_session *session)
+{
+ struct perf_header_attr *attr;
+ unsigned int i, ids, n_ids;
+
+ attr = perf_header_attr__new(&self->attr.attr);
+ if (attr == NULL)
+ return -ENOMEM;
+
+ ids = self->header.size;
+ ids -= (void *)&self->attr.id - (void *)self;
+ n_ids = ids / sizeof(u64);
+
+ for (i = 0; i < n_ids; i++) {
+ if (perf_header_attr__add_id(attr, self->attr.id[i]) < 0) {
+ perf_header_attr__delete(attr);
+ return -ENOMEM;
+ }
+ }
+
+ if (perf_header__add_attr(&session->header, attr) < 0) {
+ perf_header_attr__delete(attr);
+ return -ENOMEM;
+ }
+
+ perf_session__update_sample_type(session);
+
+ return 0;
+}
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index 0ce25cc..79ab267 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -95,4 +95,12 @@ int build_id_cache__add_s(const char *sbuild_id, const char *debugdir,
const char *name, bool is_kallsyms);
int build_id_cache__remove_s(const char *sbuild_id, const char *debugdir);

+int event__synthesize_attr(struct perf_event_attr *attr, u16 ids, u64 *id,
+ event__handler_t process,
+ struct perf_session *session);
+int event__synthesize_attrs(struct perf_header *self,
+ event__handler_t process,
+ struct perf_session *session);
+int event__process_attr(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 b767e95..2d977d1 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -210,6 +210,8 @@ static void perf_event_ops__fill_defaults(struct perf_event_ops *handler)
handler->throttle = process_event_stub;
if (handler->unthrottle == NULL)
handler->unthrottle = process_event_stub;
+ if (handler->attr == NULL)
+ handler->attr = process_event_stub;
}

static const char *event__name[] = {
@@ -223,6 +225,7 @@ static const char *event__name[] = {
[PERF_RECORD_FORK] = "FORK",
[PERF_RECORD_READ] = "READ",
[PERF_RECORD_SAMPLE] = "SAMPLE",
+ [PERF_RECORD_HEADER_ATTR] = "ATTR",
};

unsigned long event__total[PERF_RECORD_HEADER_MAX];
@@ -289,6 +292,26 @@ static void event__read_swap(event_t *self)
self->read.id = bswap_64(self->read.id);
}

+static void event__attr_swap(event_t *self)
+{
+ size_t size;
+
+ self->attr.attr.type = bswap_32(self->attr.attr.type);
+ self->attr.attr.size = bswap_32(self->attr.attr.size);
+ self->attr.attr.config = bswap_64(self->attr.attr.config);
+ self->attr.attr.sample_period = bswap_64(self->attr.attr.sample_period);
+ self->attr.attr.sample_type = bswap_64(self->attr.attr.sample_type);
+ self->attr.attr.read_format = bswap_64(self->attr.attr.read_format);
+ self->attr.attr.wakeup_events = bswap_32(self->attr.attr.wakeup_events);
+ self->attr.attr.bp_type = bswap_32(self->attr.attr.bp_type);
+ self->attr.attr.bp_addr = bswap_64(self->attr.attr.bp_addr);
+ self->attr.attr.bp_len = bswap_64(self->attr.attr.bp_len);
+
+ size = self->header.size;
+ size -= (void *)&self->attr.id - (void *)self;
+ mem_bswap_64(self->attr.id, size);
+}
+
typedef void (*event__swap_op)(event_t *self);

static event__swap_op event__swap_ops[] = {
@@ -299,6 +322,7 @@ static event__swap_op event__swap_ops[] = {
[PERF_RECORD_LOST] = event__all64_swap,
[PERF_RECORD_READ] = event__read_swap,
[PERF_RECORD_SAMPLE] = event__all64_swap,
+ [PERF_RECORD_HEADER_ATTR] = event__attr_swap,
[PERF_RECORD_HEADER_MAX] = NULL,
};

@@ -339,6 +363,8 @@ static int perf_session__process_event(struct perf_session *self,
return ops->throttle(event, self);
case PERF_RECORD_UNTHROTTLE:
return ops->unthrottle(event, self);
+ case PERF_RECORD_HEADER_ATTR:
+ return ops->attr(event, self);
default:
self->unknown_events++;
return -1;
diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index 8385fb5..07ee8f2 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -44,7 +44,8 @@ struct perf_event_ops {
lost,
read,
throttle,
- unthrottle;
+ unthrottle,
+ attr;
};

struct perf_session *perf_session__new(const char *filename, int mode, bool force);
--
1.6.4.GIT


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