perf: Convert perf header attrs into attr events

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>
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: <1270184365-8281-6-git-send-email-tzanussi@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Tom Zanussi 2010-04-01 23:59:19 -05:00 committed by Ingo Molnar
parent c239da3b4b
commit 2c46dbb517
8 changed files with 136 additions and 2 deletions

View file

@ -584,6 +584,16 @@ 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)

View file

@ -267,6 +267,7 @@ 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;

View file

@ -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;

View file

@ -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 {

View file

@ -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;
}

View file

@ -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 */

View file

@ -200,6 +200,8 @@ 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[] = {
@ -213,6 +215,7 @@ 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];
@ -279,6 +282,26 @@ 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[] = {
@ -289,6 +312,7 @@ 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,
};
@ -329,6 +353,8 @@ 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;

View file

@ -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);