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Subject[RFC][PATCH 2/2] perf: add perf-inject builtin
Date
Currently, perf 'live mode' writes build-ids at the end of the
session, which isn't actually useful for processing live mode events.

What would be better would be to have the build-ids sent before any of
the samples that reference them, which can be done by processing the
event stream and retrieving the build-ids on the first hit. Doing
that in perf-record itself, however, is off-limits.

This patch introduces perf-inject, which does the same job while
leaving perf-record untouched. Normal mode perf still records the
build-ids at the end of the session as it should, but for live mode,
perf-inject can be injected in between the record and report steps
e.g.:

perf record -o - ./hackbench 10 | perf inject -v -b | perf report -v -i -
perf-inject reads a perf-record event stream and repipes it to stdout.
At any point the processing code can inject other events into the
event stream - in this case build-ids (-b option) are read and
injected as needed into the event stream.

Build-ids are just the first user of perf-inject - potentially
anything that needs userspace processing to augment the trace stream
with additional information could make use of this facility.

Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
---
tools/perf/Makefile | 1 +
tools/perf/builtin-annotate.c | 2 +-
tools/perf/builtin-buildid-list.c | 2 +-
tools/perf/builtin-diff.c | 4 +-
tools/perf/builtin-inject.c | 228 ++++++++++++++++++++++++++++++++++++
tools/perf/builtin-kmem.c | 2 +-
tools/perf/builtin-lock.c | 2 +-
tools/perf/builtin-record.c | 2 +-
tools/perf/builtin-report.c | 2 +-
tools/perf/builtin-sched.c | 2 +-
tools/perf/builtin-timechart.c | 2 +-
tools/perf/builtin-top.c | 2 +-
tools/perf/builtin-trace.c | 2 +-
tools/perf/builtin.h | 1 +
tools/perf/perf.c | 1 +
tools/perf/util/header.c | 35 +++++--
tools/perf/util/session.c | 3 +-
tools/perf/util/session.h | 3 +-
tools/perf/util/trace-event-read.c | 19 +++-
tools/perf/util/trace-event.h | 2 +-
20 files changed, 293 insertions(+), 24 deletions(-)
create mode 100644 tools/perf/builtin-inject.c
diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 739c441..73a9666 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -491,6 +491,7 @@ BUILTIN_OBJS += $(OUTPUT)builtin-kmem.o
BUILTIN_OBJS += $(OUTPUT)builtin-lock.o
BUILTIN_OBJS += $(OUTPUT)builtin-kvm.o
BUILTIN_OBJS += $(OUTPUT)builtin-test.o
+BUILTIN_OBJS += $(OUTPUT)builtin-inject.o

PERFLIBS = $(LIB_FILE)

diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
index b57dbcf..ee154b5 100644
--- a/tools/perf/builtin-annotate.c
+++ b/tools/perf/builtin-annotate.c
@@ -554,7 +554,7 @@ static int __cmd_annotate(void)
int ret;
struct perf_session *session;

- session = perf_session__new(input_name, O_RDONLY, force);
+ session = perf_session__new(input_name, O_RDONLY, force, false);
if (session == NULL)
return -ENOMEM;

diff --git a/tools/perf/builtin-buildid-list.c b/tools/perf/builtin-buildid-list.c
index 7dc3b2e..44a47e1 100644
--- a/tools/perf/builtin-buildid-list.c
+++ b/tools/perf/builtin-buildid-list.c
@@ -39,7 +39,7 @@ static int __cmd_buildid_list(void)
int err = -1;
struct perf_session *session;

- session = perf_session__new(input_name, O_RDONLY, force);
+ session = perf_session__new(input_name, O_RDONLY, force, false);
if (session == NULL)
return -1;

diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
index 207e860..4cce68f 100644
--- a/tools/perf/builtin-diff.c
+++ b/tools/perf/builtin-diff.c
@@ -156,8 +156,8 @@ static int __cmd_diff(void)
int ret, i;
struct perf_session *session[2];

- session[0] = perf_session__new(input_old, O_RDONLY, force);
- session[1] = perf_session__new(input_new, O_RDONLY, force);
+ session[0] = perf_session__new(input_old, O_RDONLY, force, false);
+ session[1] = perf_session__new(input_new, O_RDONLY, force, false);
if (session[0] == NULL || session[1] == NULL)
return -ENOMEM;

diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c
new file mode 100644
index 0000000..a5902a3
--- /dev/null
+++ b/tools/perf/builtin-inject.c
@@ -0,0 +1,228 @@
+/*
+ * builtin-inject.c
+ *
+ * Builtin inject command: Examine the live mode (stdin) event stream
+ * and repipe it to stdout while optionally injecting additional
+ * events into it.
+ */
+#include "builtin.h"
+
+#include "perf.h"
+#include "util/session.h"
+#include "util/debug.h"
+
+#include "util/parse-options.h"
+
+static char const *input_name = "-";
+static bool inject_build_ids;
+
+static int event__repipe(event_t *event __used,
+ struct perf_session *session __used)
+{
+ uint32_t size;
+ void *buf = event;
+
+ size = event->header.size;
+
+ while (size) {
+ int ret = write(STDOUT_FILENO, buf, size);
+ if (ret < 0)
+ return -errno;
+
+ size -= ret;
+ buf += ret;
+ }
+
+ return 0;
+}
+
+static int event__repipe_mmap(event_t *self, struct perf_session *session)
+{
+ int err;
+
+ err = event__process_mmap(self, session);
+ event__repipe(self, session);
+
+ return err;
+}
+
+static int event__repipe_task(event_t *self, struct perf_session *session)
+{
+ int err;
+
+ err = event__process_task(self, session);
+ event__repipe(self, session);
+
+ return err;
+}
+
+static int event__repipe_tracing_data(event_t *self,
+ struct perf_session *session)
+{
+ int err;
+
+ event__repipe(self, session);
+ err = event__process_tracing_data(self, session);
+
+ return err;
+}
+
+static int read_buildid(struct map *self, struct perf_session *session)
+{
+ const char *name = self->dso->long_name;
+ int err;
+
+ if (filename__read_build_id(self->dso->long_name, self->dso->build_id,
+ sizeof(self->dso->build_id)) > 0) {
+ char sbuild_id[BUILD_ID_SIZE * 2 + 1];
+
+ self->dso->has_build_id = true;
+
+ build_id__sprintf(self->dso->build_id,
+ sizeof(self->dso->build_id),
+ sbuild_id);
+ pr_debug("build id found for %s: %s\n", self->dso->long_name,
+ sbuild_id);
+ }
+
+ if (self->dso->has_build_id) {
+ u16 misc = PERF_RECORD_MISC_USER;
+ struct machine *machine;
+
+ misc = self->dso->kernel ? PERF_RECORD_MISC_KERNEL : misc;
+
+ machine = perf_session__find_host_machine(session);
+ if (!machine) {
+ pr_err("Can't find machine for session\n");
+ return -1;
+ }
+
+ err = event__synthesize_build_id(self->dso, misc,
+ event__repipe, machine,
+ session);
+ if (err) {
+ pr_err("Can't synthesize build_id event for %s\n",
+ name);
+ return -1;
+ }
+ } else {
+ pr_debug("no build_id found for %s\n", name);
+ return -1;
+ }
+
+ return 0;
+}
+
+static int event__inject_buildid(event_t *event, struct perf_session *session)
+{
+ struct addr_location al;
+ struct thread *thread;
+ u8 cpumode;
+ int err = 0;
+
+ cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
+
+ thread = perf_session__findnew(session, event->ip.pid);
+ if (thread == NULL) {
+ pr_err("problem processing %d event, skipping it.\n",
+ event->header.type);
+ err = -1;
+ goto repipe;
+ }
+
+ thread__find_addr_map(thread, session, cpumode, MAP__FUNCTION,
+ event->ip.pid, event->ip.ip, &al);
+
+ if (al.map != NULL) {
+ if (!al.map->dso->hit) {
+ al.map->dso->hit = 1;
+ if (map__load(al.map, NULL) >= 0)
+ read_buildid(al.map, session);
+ else
+ pr_warning("no symbols found in %s, maybe "
+ "install a debug package?\n",
+ al.map->dso->long_name);
+ }
+ }
+
+repipe:
+ event__repipe(event, session);
+ return err;
+}
+
+struct perf_event_ops inject_ops = {
+ .sample = event__repipe,
+ .mmap = event__repipe,
+ .comm = event__repipe,
+ .fork = event__repipe,
+ .exit = event__repipe,
+ .lost = event__repipe,
+ .read = event__repipe,
+ .throttle = event__repipe,
+ .unthrottle = event__repipe,
+ .attr = event__repipe,
+ .event_type = event__repipe,
+ .tracing_data = event__repipe,
+ .build_id = event__repipe,
+};
+
+extern volatile int session_done;
+
+static void sig_handler(int sig __attribute__((__unused__)))
+{
+ session_done = 1;
+}
+
+static int __cmd_inject(void)
+{
+ struct perf_session *session;
+ int ret = -EINVAL;
+
+ signal(SIGINT, sig_handler);
+
+ if (inject_build_ids) {
+ inject_ops.sample = event__inject_buildid;
+ inject_ops.mmap = event__repipe_mmap;
+ inject_ops.fork = event__repipe_task;
+ inject_ops.tracing_data = event__repipe_tracing_data;
+ }
+
+ session = perf_session__new(input_name, O_RDONLY, false, true);
+ if (session == NULL)
+ return -ENOMEM;
+
+ ret = perf_session__process_events(session, &inject_ops);
+
+ perf_session__delete(session);
+
+ return ret;
+}
+
+static const char * const report_usage[] = {
+ "perf inject [<options>]",
+ NULL
+};
+
+static const struct option options[] = {
+ OPT_BOOLEAN('b', "inject build-ids", &inject_build_ids,
+ "Inject build-ids into the output stream"),
+ OPT_INCR('v', "verbose", &verbose,
+ "be more verbose (show build ids, etc)"),
+ OPT_END()
+};
+
+int cmd_inject(int argc, const char **argv, const char *prefix __used)
+{
+ argc = parse_options(argc, argv, options, report_usage, 0);
+
+ /*
+ * Any (unrecognized) arguments left?
+ */
+ if (argc)
+ usage_with_options(report_usage, options);
+
+ if (symbol__init() < 0)
+ return -1;
+
+ return __cmd_inject();
+}
diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
index ee05dba..31f60a2 100644
--- a/tools/perf/builtin-kmem.c
+++ b/tools/perf/builtin-kmem.c
@@ -492,7 +492,7 @@ static void sort_result(void)
static int __cmd_kmem(void)
{
int err = -EINVAL;
- struct perf_session *session = perf_session__new(input_name, O_RDONLY, 0);
+ struct perf_session *session = perf_session__new(input_name, O_RDONLY, 0, false);
if (session == NULL)
return -ENOMEM;

diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c
index ce27675..6605000 100644
--- a/tools/perf/builtin-lock.c
+++ b/tools/perf/builtin-lock.c
@@ -818,7 +818,7 @@ static struct perf_event_ops eops = {

static int read_events(void)
{
- session = perf_session__new(input_name, O_RDONLY, 0);
+ session = perf_session__new(input_name, O_RDONLY, 0, false);
if (!session)
die("Initializing perf session failed\n");

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 5d21a3a..8364e00 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -548,7 +548,7 @@ static int __cmd_record(int argc, const char **argv)
}

session = perf_session__new(output_name, O_WRONLY,
- write_mode == WRITE_FORCE);
+ write_mode == WRITE_FORCE, false);
if (session == NULL) {
pr_err("Not enough memory for reading perf file header\n");
return -1;
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index f1b46eb..0152b54 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -289,7 +289,7 @@ static int __cmd_report(void)

signal(SIGINT, sig_handler);

- session = perf_session__new(input_name, O_RDONLY, force);
+ session = perf_session__new(input_name, O_RDONLY, force, false);
if (session == NULL)
return -ENOMEM;

diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 94453f1..aef6ed0 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -1660,7 +1660,7 @@ static struct perf_event_ops event_ops = {
static int read_events(void)
{
int err = -EINVAL;
- struct perf_session *session = perf_session__new(input_name, O_RDONLY, 0);
+ struct perf_session *session = perf_session__new(input_name, O_RDONLY, 0, false);
if (session == NULL)
return -ENOMEM;

diff --git a/tools/perf/builtin-timechart.c b/tools/perf/builtin-timechart.c
index c35aa44..5a52ed9 100644
--- a/tools/perf/builtin-timechart.c
+++ b/tools/perf/builtin-timechart.c
@@ -936,7 +936,7 @@ static struct perf_event_ops event_ops = {

static int __cmd_timechart(void)
{
- struct perf_session *session = perf_session__new(input_name, O_RDONLY, 0);
+ struct perf_session *session = perf_session__new(input_name, O_RDONLY, 0, false);
int ret = -EINVAL;

if (session == NULL)
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index d95281f..3de3977 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -1287,7 +1287,7 @@ static int __cmd_top(void)
* FIXME: perf_session__new should allow passing a O_MMAP, so that all this
* mmap reading, etc is encapsulated in it. Use O_WRONLY for now.
*/
- struct perf_session *session = perf_session__new(NULL, O_WRONLY, false);
+ struct perf_session *session = perf_session__new(NULL, O_WRONLY, false, false);
if (session == NULL)
return -ENOMEM;

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 77f556f..9c483e9 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -661,7 +661,7 @@ int cmd_trace(int argc, const char **argv, const char *prefix __used)
if (!script_name)
setup_pager();

- session = perf_session__new(input_name, O_RDONLY, 0);
+ session = perf_session__new(input_name, O_RDONLY, 0, false);
if (session == NULL)
return -ENOMEM;

diff --git a/tools/perf/builtin.h b/tools/perf/builtin.h
index 34a8a9a..921245b 100644
--- a/tools/perf/builtin.h
+++ b/tools/perf/builtin.h
@@ -34,5 +34,6 @@ extern int cmd_kmem(int argc, const char **argv, const char *prefix);
extern int cmd_lock(int argc, const char **argv, const char *prefix);
extern int cmd_kvm(int argc, const char **argv, const char *prefix);
extern int cmd_test(int argc, const char **argv, const char *prefix);
+extern int cmd_inject(int argc, const char **argv, const char *prefix);

#endif
diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index 5ff9b5b..08e0e5d 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -309,6 +309,7 @@ static void handle_internal_command(int argc, const char **argv)
{ "lock", cmd_lock, 0 },
{ "kvm", cmd_kvm, 0 },
{ "test", cmd_test, 0 },
+ { "inject", cmd_inject, 0 },
};
unsigned int i;
static const char ext[] = STRIP_EXTENSION;
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 83b79e2..2b9f898 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -712,10 +712,18 @@ static int __event_process_build_id(struct build_id_event *bev,

dso = __dsos__findnew(head, filename);
if (dso != NULL) {
+ char sbuild_id[BUILD_ID_SIZE * 2 + 1];
+
dso__set_build_id(dso, &bev->build_id);
- if (filename[0] == '[')
- dso->kernel = dso_type;
- }
+
+ if (filename[0] == '[')
+ dso->kernel = dso_type;
+
+ build_id__sprintf(dso->build_id, sizeof(dso->build_id),
+ sbuild_id);
+ pr_debug("build id event received for %s: %s\n",
+ dso->long_name, sbuild_id);
+ }

err = 0;
out:
@@ -766,7 +774,7 @@ static int perf_file_section__process(struct perf_file_section *self,

switch (feat) {
case HEADER_TRACE_INFO:
- trace_report(fd);
+ trace_report(fd, false);
break;

case HEADER_BUILD_ID:
@@ -781,12 +789,16 @@ static int perf_file_section__process(struct perf_file_section *self,
}

static int perf_file_header__read_pipe(struct perf_pipe_file_header *self,
- struct perf_header *ph, int fd)
+ struct perf_header *ph, int fd,
+ bool repipe)
{
if (do_read(fd, self, sizeof(*self)) <= 0 ||
memcmp(&self->magic, __perf_magic, sizeof(self->magic)))
return -1;

+ if (repipe && do_write(STDOUT_FILENO, self, sizeof(*self)) < 0)
+ return -1;
+
if (self->size != sizeof(*self)) {
u64 size = bswap_64(self->size);

@@ -804,7 +816,8 @@ static int perf_header__read_pipe(struct perf_session *session, int fd)
struct perf_header *self = &session->header;
struct perf_pipe_file_header f_header;

- if (perf_file_header__read_pipe(&f_header, self, fd) < 0) {
+ if (perf_file_header__read_pipe(&f_header, self, fd,
+ session->repipe) < 0) {
pr_debug("incompatible file format\n");
return -EINVAL;
}
@@ -1095,12 +1108,17 @@ int event__process_tracing_data(event_t *self,
lseek(session->fd, offset + sizeof(struct tracing_data_event),
SEEK_SET);

- size_read = trace_report(session->fd);
+ size_read = trace_report(session->fd, session->repipe);

padding = ALIGN(size_read, sizeof(u64)) - size_read;

if (read(session->fd, buf, padding) < 0)
die("reading input file");
+ if (session->repipe) {
+ int retw = write(STDOUT_FILENO, buf, padding);
+ if (retw <= 0 || retw != padding)
+ die("repiping tracing data padding");
+ }

if (size_read + padding != size)
die("tracing data size mismatch");
@@ -1109,7 +1127,8 @@ int event__process_tracing_data(event_t *self,
}

int event__synthesize_build_id(struct dso *pos, u16 misc,
- event__handler_t process, struct machine *machine,
+ event__handler_t process,
+ struct machine *machine,
struct perf_session *session)
{
event_t ev;
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index a8dd73e..5d353e7 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -77,7 +77,7 @@ int perf_session__create_kernel_maps(struct perf_session *self)
return ret;
}

-struct perf_session *perf_session__new(const char *filename, int mode, bool force)
+struct perf_session *perf_session__new(const char *filename, int mode, bool force, bool repipe)
{
size_t len = filename ? strlen(filename) + 1 : 0;
struct perf_session *self = zalloc(sizeof(*self) + len);
@@ -97,6 +97,7 @@ struct perf_session *perf_session__new(const char *filename, int mode, bool forc
self->cwdlen = 0;
self->unknown_events = 0;
self->machines = RB_ROOT;
+ self->repipe = repipe;
self->ordered_samples.flush_limit = ULLONG_MAX;
INIT_LIST_HEAD(&self->ordered_samples.samples_head);

diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index 61ca92e..f2b2c6a 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -34,6 +34,7 @@ struct perf_session {
u64 sample_type;
int fd;
bool fd_pipe;
+ bool repipe;
int cwdlen;
char *cwd;
struct ordered_samples ordered_samples;
@@ -59,7 +60,7 @@ struct perf_event_ops {
bool ordered_samples;
};

-struct perf_session *perf_session__new(const char *filename, int mode, bool force);
+struct perf_session *perf_session__new(const char *filename, int mode, bool force, bool repipe);
void perf_session__delete(struct perf_session *self);

void perf_event_header__bswap(struct perf_event_header *self);
diff --git a/tools/perf/util/trace-event-read.c b/tools/perf/util/trace-event-read.c
index 44889c9..43f19c1 100644
--- a/tools/perf/util/trace-event-read.c
+++ b/tools/perf/util/trace-event-read.c
@@ -51,6 +51,7 @@ static int long_size;
static unsigned long page_size;

static ssize_t calc_data_size;
+static bool repipe;

static int do_read(int fd, void *buf, int size)
{
@@ -62,6 +63,13 @@ static int do_read(int fd, void *buf, int size)
if (ret <= 0)
return -1;

+ if (repipe) {
+ int retw = write(STDOUT_FILENO, buf, ret);
+
+ if (retw <= 0 || retw != ret)
+ die("repiping input file");
+ }
+
size -= ret;
buf += ret;
}
@@ -116,6 +124,13 @@ static char *read_string(void)
if (!r)
die("no data");

+ if (repipe) {
+ int retw = write(STDOUT_FILENO, &c, 1);
+
+ if (retw <= 0 || retw != r)
+ die("repiping input file string");
+ }
+
buf[size++] = c;

if (!c)
@@ -454,7 +469,7 @@ struct record *trace_read_data(int cpu)
return data;
}

-ssize_t trace_report(int fd)
+ssize_t trace_report(int fd, bool __repipe)
{
char buf[BUFSIZ];
char test[] = { 23, 8, 68 };
@@ -465,6 +480,7 @@ ssize_t trace_report(int fd)
ssize_t size;

calc_data_size = 1;
+ repipe = __repipe;

input_fd = fd;

@@ -499,6 +515,7 @@ ssize_t trace_report(int fd)

size = calc_data_size - 1;
calc_data_size = 0;
+ repipe = false;

if (show_funcs) {
print_funcs();
diff --git a/tools/perf/util/trace-event.h b/tools/perf/util/trace-event.h
index 1f45d46..ebfee80 100644
--- a/tools/perf/util/trace-event.h
+++ b/tools/perf/util/trace-event.h
@@ -163,7 +163,7 @@ struct record *trace_read_data(int cpu);

void parse_set_info(int nr_cpus, int long_sz);

-ssize_t trace_report(int fd);
+ssize_t trace_report(int fd, bool repipe);

void *malloc_or_die(unsigned int size);

--
1.6.4.GIT


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