perf evlist: Fix grouping of multiple events
The __perf_evsel__open routing was grouping just the threads for that
specific events per cpu when we want to group all threads in all events
to the first fd opened on that cpu.
So pass the xyarray with the first event, where the other events will be
able to get that first per cpu fd.
At some point top and record will switch to using perf_evlist__open that
takes care of this detail and probably will also handle the fallback
from hw to soft counters, etc.
Reported-by: Deng-Cheng Zhu <dczhu@mips.com>
Tested-by: Deng-Cheng Zhu <dczhu@mips.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-ebm34rh098i9y9v4cytfdp0x@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index f82480f..40088a5 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -262,13 +262,16 @@
static void open_counters(struct perf_evlist *evlist)
{
- struct perf_evsel *pos;
+ struct perf_evsel *pos, *first;
if (evlist->cpus->map[0] < 0)
no_inherit = true;
+ first = list_entry(evlist->entries.next, struct perf_evsel, node);
+
list_for_each_entry(pos, &evlist->entries, node) {
struct perf_event_attr *attr = &pos->attr;
+ struct xyarray *group_fd = NULL;
/*
* Check if parse_single_tracepoint_event has already asked for
* PERF_SAMPLE_TIME.
@@ -283,11 +286,15 @@
*/
bool time_needed = attr->sample_type & PERF_SAMPLE_TIME;
+ if (group && pos != first)
+ group_fd = first->fd;
+
config_attr(pos, evlist);
retry_sample_id:
attr->sample_id_all = sample_id_all_avail ? 1 : 0;
try_again:
- if (perf_evsel__open(pos, evlist->cpus, evlist->threads, group) < 0) {
+ if (perf_evsel__open(pos, evlist->cpus, evlist->threads, group,
+ group_fd) < 0) {
int err = errno;
if (err == EPERM || err == EACCES) {
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 7ce65f5..7d98676 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -278,9 +278,14 @@
struct stats runtime_dtlb_cache_stats[MAX_NR_CPUS];
struct stats walltime_nsecs_stats;
-static int create_perf_stat_counter(struct perf_evsel *evsel)
+static int create_perf_stat_counter(struct perf_evsel *evsel,
+ struct perf_evsel *first)
{
struct perf_event_attr *attr = &evsel->attr;
+ struct xyarray *group_fd = NULL;
+
+ if (group && evsel != first)
+ group_fd = first->fd;
if (scale)
attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
@@ -289,14 +294,15 @@
attr->inherit = !no_inherit;
if (system_wide)
- return perf_evsel__open_per_cpu(evsel, evsel_list->cpus, group);
-
+ return perf_evsel__open_per_cpu(evsel, evsel_list->cpus,
+ group, group_fd);
if (target_pid == -1 && target_tid == -1) {
attr->disabled = 1;
attr->enable_on_exec = 1;
}
- return perf_evsel__open_per_thread(evsel, evsel_list->threads, group);
+ return perf_evsel__open_per_thread(evsel, evsel_list->threads,
+ group, group_fd);
}
/*
@@ -396,7 +402,7 @@
static int run_perf_stat(int argc __used, const char **argv)
{
unsigned long long t0, t1;
- struct perf_evsel *counter;
+ struct perf_evsel *counter, *first;
int status = 0;
int child_ready_pipe[2], go_pipe[2];
const bool forks = (argc > 0);
@@ -453,8 +459,10 @@
close(child_ready_pipe[0]);
}
+ first = list_entry(evsel_list->entries.next, struct perf_evsel, node);
+
list_for_each_entry(counter, &evsel_list->entries, node) {
- if (create_perf_stat_counter(counter) < 0) {
+ if (create_perf_stat_counter(counter, first) < 0) {
if (errno == EINVAL || errno == ENOSYS || errno == ENOENT) {
if (verbose)
ui__warning("%s event is not supported by the kernel.\n",
diff --git a/tools/perf/builtin-test.c b/tools/perf/builtin-test.c
index efe696f..831d1ba 100644
--- a/tools/perf/builtin-test.c
+++ b/tools/perf/builtin-test.c
@@ -291,7 +291,7 @@
goto out_thread_map_delete;
}
- if (perf_evsel__open_per_thread(evsel, threads, false) < 0) {
+ if (perf_evsel__open_per_thread(evsel, threads, false, NULL) < 0) {
pr_debug("failed to open counter: %s, "
"tweak /proc/sys/kernel/perf_event_paranoid?\n",
strerror(errno));
@@ -366,7 +366,7 @@
goto out_thread_map_delete;
}
- if (perf_evsel__open(evsel, cpus, threads, false) < 0) {
+ if (perf_evsel__open(evsel, cpus, threads, false, NULL) < 0) {
pr_debug("failed to open counter: %s, "
"tweak /proc/sys/kernel/perf_event_paranoid?\n",
strerror(errno));
@@ -531,7 +531,7 @@
perf_evlist__add(evlist, evsels[i]);
- if (perf_evsel__open(evsels[i], cpus, threads, false) < 0) {
+ if (perf_evsel__open(evsels[i], cpus, threads, false, NULL) < 0) {
pr_debug("failed to open counter: %s, "
"tweak /proc/sys/kernel/perf_event_paranoid?\n",
strerror(errno));
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 7a87171..d2fc754 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -834,10 +834,16 @@
static void start_counters(struct perf_evlist *evlist)
{
- struct perf_evsel *counter;
+ struct perf_evsel *counter, *first;
+
+ first = list_entry(evlist->entries.next, struct perf_evsel, node);
list_for_each_entry(counter, &evlist->entries, node) {
struct perf_event_attr *attr = &counter->attr;
+ struct xyarray *group_fd = NULL;
+
+ if (group && counter != first)
+ group_fd = first->fd;
attr->sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID;
@@ -860,7 +866,8 @@
attr->inherit = inherit;
try_again:
if (perf_evsel__open(counter, top.evlist->cpus,
- top.evlist->threads, group) < 0) {
+ top.evlist->threads, group,
+ group_fd) < 0) {
int err = errno;
if (err == EPERM || err == EACCES) {
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 2f6bc89..fbb4b4a 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -539,3 +539,33 @@
{
evlist->selected = evsel;
}
+
+int perf_evlist__open(struct perf_evlist *evlist, bool group)
+{
+ struct perf_evsel *evsel, *first;
+ int err, ncpus, nthreads;
+
+ first = list_entry(evlist->entries.next, struct perf_evsel, node);
+
+ list_for_each_entry(evsel, &evlist->entries, node) {
+ struct xyarray *group_fd = NULL;
+
+ if (group && evsel != first)
+ group_fd = first->fd;
+
+ err = perf_evsel__open(evsel, evlist->cpus, evlist->threads,
+ group, group_fd);
+ if (err < 0)
+ goto out_err;
+ }
+
+ return 0;
+out_err:
+ ncpus = evlist->cpus ? evlist->cpus->nr : 1;
+ nthreads = evlist->threads ? evlist->threads->nr : 1;
+
+ list_for_each_entry_reverse(evsel, &evlist->entries, node)
+ perf_evsel__close(evsel, ncpus, nthreads);
+
+ return err;
+}
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index 6be71fc..1779ffe 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -50,6 +50,8 @@
union perf_event *perf_evlist__mmap_read(struct perf_evlist *self, int idx);
+int perf_evlist__open(struct perf_evlist *evlist, bool group);
+
int perf_evlist__alloc_mmap(struct perf_evlist *evlist);
int perf_evlist__mmap(struct perf_evlist *evlist, int pages, bool overwrite);
void perf_evlist__munmap(struct perf_evlist *evlist);
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index b46f6e4..e426264 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -16,6 +16,7 @@
#include "thread_map.h"
#define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
+#define GROUP_FD(group_fd, cpu) (*(int *)xyarray__entry(group_fd, cpu, 0))
int __perf_evsel__sample_size(u64 sample_type)
{
@@ -204,15 +205,16 @@
}
static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
- struct thread_map *threads, bool group)
+ struct thread_map *threads, bool group,
+ struct xyarray *group_fds)
{
int cpu, thread;
unsigned long flags = 0;
- int pid = -1;
+ int pid = -1, err;
if (evsel->fd == NULL &&
perf_evsel__alloc_fd(evsel, cpus->nr, threads->nr) < 0)
- return -1;
+ return -ENOMEM;
if (evsel->cgrp) {
flags = PERF_FLAG_PID_CGROUP;
@@ -220,7 +222,7 @@
}
for (cpu = 0; cpu < cpus->nr; cpu++) {
- int group_fd = -1;
+ int group_fd = group_fds ? GROUP_FD(group_fds, cpu) : -1;
for (thread = 0; thread < threads->nr; thread++) {
@@ -231,8 +233,10 @@
pid,
cpus->map[cpu],
group_fd, flags);
- if (FD(evsel, cpu, thread) < 0)
+ if (FD(evsel, cpu, thread) < 0) {
+ err = -errno;
goto out_close;
+ }
if (group && group_fd == -1)
group_fd = FD(evsel, cpu, thread);
@@ -249,7 +253,17 @@
}
thread = threads->nr;
} while (--cpu >= 0);
- return -1;
+ return err;
+}
+
+void perf_evsel__close(struct perf_evsel *evsel, int ncpus, int nthreads)
+{
+ if (evsel->fd == NULL)
+ return;
+
+ perf_evsel__close_fd(evsel, ncpus, nthreads);
+ perf_evsel__free_fd(evsel);
+ evsel->fd = NULL;
}
static struct {
@@ -269,7 +283,8 @@
};
int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
- struct thread_map *threads, bool group)
+ struct thread_map *threads, bool group,
+ struct xyarray *group_fd)
{
if (cpus == NULL) {
/* Work around old compiler warnings about strict aliasing */
@@ -279,19 +294,23 @@
if (threads == NULL)
threads = &empty_thread_map.map;
- return __perf_evsel__open(evsel, cpus, threads, group);
+ return __perf_evsel__open(evsel, cpus, threads, group, group_fd);
}
int perf_evsel__open_per_cpu(struct perf_evsel *evsel,
- struct cpu_map *cpus, bool group)
+ struct cpu_map *cpus, bool group,
+ struct xyarray *group_fd)
{
- return __perf_evsel__open(evsel, cpus, &empty_thread_map.map, group);
+ return __perf_evsel__open(evsel, cpus, &empty_thread_map.map, group,
+ group_fd);
}
int perf_evsel__open_per_thread(struct perf_evsel *evsel,
- struct thread_map *threads, bool group)
+ struct thread_map *threads, bool group,
+ struct xyarray *group_fd)
{
- return __perf_evsel__open(evsel, &empty_cpu_map.map, threads, group);
+ return __perf_evsel__open(evsel, &empty_cpu_map.map, threads, group,
+ group_fd);
}
static int perf_event__parse_id_sample(const union perf_event *event, u64 type,
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index e9a3155..b1d15e6 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -82,11 +82,15 @@
void perf_evsel__close_fd(struct perf_evsel *evsel, int ncpus, int nthreads);
int perf_evsel__open_per_cpu(struct perf_evsel *evsel,
- struct cpu_map *cpus, bool group);
+ struct cpu_map *cpus, bool group,
+ struct xyarray *group_fds);
int perf_evsel__open_per_thread(struct perf_evsel *evsel,
- struct thread_map *threads, bool group);
+ struct thread_map *threads, bool group,
+ struct xyarray *group_fds);
int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
- struct thread_map *threads, bool group);
+ struct thread_map *threads, bool group,
+ struct xyarray *group_fds);
+void perf_evsel__close(struct perf_evsel *evsel, int ncpus, int nthreads);
#define perf_evsel__match(evsel, t, c) \
(evsel->attr.type == PERF_TYPE_##t && \
diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c
index 7624324..9dd47a4 100644
--- a/tools/perf/util/python.c
+++ b/tools/perf/util/python.c
@@ -623,7 +623,11 @@
cpus = ((struct pyrf_cpu_map *)pcpus)->cpus;
evsel->attr.inherit = inherit;
- if (perf_evsel__open(evsel, cpus, threads, group) < 0) {
+ /*
+ * This will group just the fds for this single evsel, to group
+ * multiple events, use evlist.open().
+ */
+ if (perf_evsel__open(evsel, cpus, threads, group, NULL) < 0) {
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
@@ -814,6 +818,25 @@
return Py_None;
}
+static PyObject *pyrf_evlist__open(struct pyrf_evlist *pevlist,
+ PyObject *args, PyObject *kwargs)
+{
+ struct perf_evlist *evlist = &pevlist->evlist;
+ int group = 0;
+ static char *kwlist[] = { "group", NULL };
+
+ if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|OOii", kwlist, &group))
+ return NULL;
+
+ if (perf_evlist__open(evlist, group) < 0) {
+ PyErr_SetFromErrno(PyExc_OSError);
+ return NULL;
+ }
+
+ Py_INCREF(Py_None);
+ return Py_None;
+}
+
static PyMethodDef pyrf_evlist__methods[] = {
{
.ml_name = "mmap",
@@ -822,6 +845,12 @@
.ml_doc = PyDoc_STR("mmap the file descriptor table.")
},
{
+ .ml_name = "open",
+ .ml_meth = (PyCFunction)pyrf_evlist__open,
+ .ml_flags = METH_VARARGS | METH_KEYWORDS,
+ .ml_doc = PyDoc_STR("open the file descriptors.")
+ },
+ {
.ml_name = "poll",
.ml_meth = (PyCFunction)pyrf_evlist__poll,
.ml_flags = METH_VARARGS | METH_KEYWORDS,