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>

5 files changed, 100 insertions, 16 deletions

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 2f6bc89027da..fbb4b4ab9cc6 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -539,3 +539,33 @@ void perf_evlist__set_selected(struct perf_evlist *evlist,
 {
         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 6be71fc57794..1779ffef7828 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -50,6 +50,8 @@ struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id);
 
 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 b46f6e4bff3c..e42626422587 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 @@ int __perf_evsel__read(struct perf_evsel *evsel,
 }
 
 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 @@ static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
         }
 
         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 @@ static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
                                                                      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 @@ out_close:
                 }
                 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 @@ static struct {
 };
 
 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 @@ int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
         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 e9a31554e265..b1d15e6f7ae3 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -82,11 +82,15 @@ void perf_evsel__free_id(struct perf_evsel *evsel);
 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 7624324efad4..9dd47a4f2596 100644
--- a/tools/perf/util/python.c
+++ b/tools/perf/util/python.c
@@ -623,7 +623,11 @@ static PyObject *pyrf_evsel__open(struct pyrf_evsel *pevsel,
                 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 @@ static PyObject *pyrf_evlist__read_on_cpu(struct pyrf_evlist *pevlist,
         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 @@ static PyMethodDef pyrf_evlist__methods[] = {
                 .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,