perf tools: Add reference counting for cpu_map object

Adding refference counting for cpu_map object, so it could be easily
shared among other objects.

Using cpu_map__put instead cpu_map__delete and making cpu_map__delete
static.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1435012588-9007-4-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

13 files changed, 45 insertions, 15 deletions

diff --git a/tools/perf/tests/code-reading.c b/tools/perf/tests/code-reading.c
index 22f8a00446e1..6b3250f54240 100644
--- a/tools/perf/tests/code-reading.c
+++ b/tools/perf/tests/code-reading.c
@@ -545,7 +545,7 @@ out_err:
         if (evlist) {
                 perf_evlist__delete(evlist);
         } else {
-                cpu_map__delete(cpus);
+                cpu_map__put(cpus);
                 thread_map__delete(threads);
         }
         machines__destroy_kernel_maps(&machines);
diff --git a/tools/perf/tests/keep-tracking.c b/tools/perf/tests/keep-tracking.c
index 5b171d1e338b..a330235cefc0 100644
--- a/tools/perf/tests/keep-tracking.c
+++ b/tools/perf/tests/keep-tracking.c
@@ -144,7 +144,7 @@ out_err:
                 perf_evlist__disable(evlist);
                 perf_evlist__delete(evlist);
         } else {
-                cpu_map__delete(cpus);
+                cpu_map__put(cpus);
                 thread_map__delete(threads);
         }
 
diff --git a/tools/perf/tests/mmap-basic.c b/tools/perf/tests/mmap-basic.c
index 5855cf471210..5a9ef5833452 100644
--- a/tools/perf/tests/mmap-basic.c
+++ b/tools/perf/tests/mmap-basic.c
@@ -140,7 +140,7 @@ out_delete_evlist:
         cpus    = NULL;
         threads = NULL;
 out_free_cpus:
-        cpu_map__delete(cpus);
+        cpu_map__put(cpus);
 out_free_threads:
         thread_map__delete(threads);
         return err;
diff --git a/tools/perf/tests/switch-tracking.c b/tools/perf/tests/switch-tracking.c
index 0d31403ea593..1b06122beb76 100644
--- a/tools/perf/tests/switch-tracking.c
+++ b/tools/perf/tests/switch-tracking.c
@@ -560,7 +560,7 @@ out:
                 perf_evlist__disable(evlist);
                 perf_evlist__delete(evlist);
         } else {
-                cpu_map__delete(cpus);
+                cpu_map__put(cpus);
                 thread_map__delete(threads);
         }
 
diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c
index c4e55b71010c..3667e2123e5b 100644
--- a/tools/perf/util/cpumap.c
+++ b/tools/perf/util/cpumap.c
@@ -5,6 +5,7 @@
 #include <assert.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include "asm/bug.h"
 
 static struct cpu_map *cpu_map__default_new(void)
 {
@@ -22,6 +23,7 @@ static struct cpu_map *cpu_map__default_new(void)
                         cpus->map[i] = i;
 
                 cpus->nr = nr_cpus;
+                atomic_set(&cpus->refcnt, 1);
         }
 
         return cpus;
@@ -35,6 +37,7 @@ static struct cpu_map *cpu_map__trim_new(int nr_cpus, int *tmp_cpus)
         if (cpus != NULL) {
                 cpus->nr = nr_cpus;
                 memcpy(cpus->map, tmp_cpus, payload_size);
+                atomic_set(&cpus->refcnt, 1);
         }
 
         return cpus;
@@ -194,14 +197,32 @@ struct cpu_map *cpu_map__dummy_new(void)
         if (cpus != NULL) {
                 cpus->nr = 1;
                 cpus->map[0] = -1;
+                atomic_set(&cpus->refcnt, 1);
         }
 
         return cpus;
 }
 
-void cpu_map__delete(struct cpu_map *map)
+static void cpu_map__delete(struct cpu_map *map)
 {
-        free(map);
+        if (map) {
+                WARN_ONCE(atomic_read(&map->refcnt) != 0,
+                          "cpu_map refcnt unbalanced\n");
+                free(map);
+        }
+}
+
+struct cpu_map *cpu_map__get(struct cpu_map *map)
+{
+        if (map)
+                atomic_inc(&map->refcnt);
+        return map;
+}
+
+void cpu_map__put(struct cpu_map *map)
+{
+        if (map && atomic_dec_and_test(&map->refcnt))
+                cpu_map__delete(map);
 }
 
 int cpu_map__get_socket(struct cpu_map *map, int idx)
@@ -263,6 +284,7 @@ static int cpu_map__build_map(struct cpu_map *cpus, struct cpu_map **res,
         /* ensure we process id in increasing order */
         qsort(c->map, c->nr, sizeof(int), cmp_ids);
 
+        atomic_set(&cpus->refcnt, 1);
         *res = c;
         return 0;
 }
diff --git a/tools/perf/util/cpumap.h b/tools/perf/util/cpumap.h
index 61a654849002..0af9cecb4c51 100644
--- a/tools/perf/util/cpumap.h
+++ b/tools/perf/util/cpumap.h
@@ -3,18 +3,19 @@
 
 #include <stdio.h>
 #include <stdbool.h>
+#include <linux/atomic.h>
 
 #include "perf.h"
 #include "util/debug.h"
 
 struct cpu_map {
+        atomic_t refcnt;
         int nr;
         int map[];
 };
 
 struct cpu_map *cpu_map__new(const char *cpu_list);
 struct cpu_map *cpu_map__dummy_new(void);
-void cpu_map__delete(struct cpu_map *map);
 struct cpu_map *cpu_map__read(FILE *file);
 size_t cpu_map__fprintf(struct cpu_map *map, FILE *fp);
 int cpu_map__get_socket(struct cpu_map *map, int idx);
@@ -22,6 +23,9 @@ int cpu_map__get_core(struct cpu_map *map, int idx);
 int cpu_map__build_socket_map(struct cpu_map *cpus, struct cpu_map **sockp);
 int cpu_map__build_core_map(struct cpu_map *cpus, struct cpu_map **corep);
 
+struct cpu_map *cpu_map__get(struct cpu_map *map);
+void cpu_map__put(struct cpu_map *map);
+
 static inline int cpu_map__socket(struct cpu_map *sock, int s)
 {
         if (!sock || s > sock->nr || s < 0)
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index d29df901be3e..59498f7b3e9b 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -114,7 +114,7 @@ void perf_evlist__delete(struct perf_evlist *evlist)
 {
         perf_evlist__munmap(evlist);
         perf_evlist__close(evlist);
-        cpu_map__delete(evlist->cpus);
+        cpu_map__put(evlist->cpus);
         thread_map__delete(evlist->threads);
         evlist->cpus = NULL;
         evlist->threads = NULL;
@@ -1353,7 +1353,7 @@ static int perf_evlist__create_syswide_maps(struct perf_evlist *evlist)
 out:
         return err;
 out_free_cpus:
-        cpu_map__delete(evlist->cpus);
+        cpu_map__put(evlist->cpus);
         evlist->cpus = NULL;
         goto out;
 }
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 1b56047af96b..31b0afb68825 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -885,6 +885,7 @@ void perf_evsel__exit(struct perf_evsel *evsel)
         perf_evsel__free_fd(evsel);
         perf_evsel__free_id(evsel);
         close_cgroup(evsel->cgrp);
+        cpu_map__put(evsel->cpus);
         zfree(&evsel->group_name);
         zfree(&evsel->name);
         perf_evsel__object.fini(evsel);
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 2a4d1ec02846..09f8d2357108 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -17,6 +17,7 @@
 #include "parse-events-flex.h"
 #include "pmu.h"
 #include "thread_map.h"
+#include "cpumap.h"
 #include "asm/bug.h"
 
 #define MAX_NAME_LEN 100
@@ -285,7 +286,9 @@ __add_event(struct list_head *list, int *idx,
         if (!evsel)
                 return NULL;
 
-        evsel->cpus = cpus;
+        if (cpus)
+                evsel->cpus = cpu_map__get(cpus);
+
         if (name)
                 evsel->name = strdup(name);
         list_add_tail(&evsel->node, list);
diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c
index d906d0ad5d40..b106d56df240 100644
--- a/tools/perf/util/python.c
+++ b/tools/perf/util/python.c
@@ -384,7 +384,7 @@ static int pyrf_cpu_map__init(struct pyrf_cpu_map *pcpus,
 
 static void pyrf_cpu_map__delete(struct pyrf_cpu_map *pcpus)
 {
-        cpu_map__delete(pcpus->cpus);
+        cpu_map__put(pcpus->cpus);
         pcpus->ob_type->tp_free((PyObject*)pcpus);
 }
 
diff --git a/tools/perf/util/record.c b/tools/perf/util/record.c
index d457c523a33d..1f7becbe5e18 100644
--- a/tools/perf/util/record.c
+++ b/tools/perf/util/record.c
@@ -64,7 +64,7 @@ static bool perf_probe_api(setup_probe_fn_t fn)
         if (!cpus)
                 return false;
         cpu = cpus->map[0];
-        cpu_map__delete(cpus);
+        cpu_map__put(cpus);
 
         do {
                 ret = perf_do_probe_api(fn, cpu, try[i++]);
@@ -226,7 +226,7 @@ bool perf_evlist__can_select_event(struct perf_evlist *evlist, const char *str)
                 struct cpu_map *cpus = cpu_map__new(NULL);
 
                 cpu =  cpus ? cpus->map[0] : 0;
-                cpu_map__delete(cpus);
+                cpu_map__put(cpus);
         } else {
                 cpu = evlist->cpus->map[0];
         }
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index b5549b58bb2b..ed9dc2555ec7 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1895,7 +1895,7 @@ int perf_session__cpu_bitmap(struct perf_session *session,
         err = 0;
 
 out_delete_map:
-        cpu_map__delete(map);
+        cpu_map__put(map);
         return err;
 }
 
diff --git a/tools/perf/util/svghelper.c b/tools/perf/util/svghelper.c
index 283d3e73e2f2..eec6c1149f44 100644
--- a/tools/perf/util/svghelper.c
+++ b/tools/perf/util/svghelper.c
@@ -748,7 +748,7 @@ static int str_to_bitmap(char *s, cpumask_t *b)
                 set_bit(c, cpumask_bits(b));
         }
 
-        cpu_map__delete(m);
+        cpu_map__put(m);
 
         return ret;
 }