[PATCH 03/25] perf tools: Add reference counting for cpu_map object

Jiri Olsa
2015-06-10T18:11:55Z

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.

Link: http://lkml.kernel.org/n/tip-gwy96ohuwhjz603bnf70af6i@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/tests/code-reading.c | 2 +-
tools/perf/tests/keep-tracking.c | 2 +-
tools/perf/tests/mmap-basic.c | 2 +-
tools/perf/tests/switch-tracking.c | 2 +-
tools/perf/util/cpumap.c | 24 ++++++++++++++++++++++--
tools/perf/util/cpumap.h | 5 ++++-
tools/perf/util/evlist.c | 4 ++--
tools/perf/util/evsel.c | 1 +
tools/perf/util/parse-events.c | 5 ++++-
tools/perf/util/python.c | 2 +-
tools/perf/util/record.c | 4 ++--
tools/perf/util/session.c | 2 +-
tools/perf/util/svghelper.c | 2 +-
13 files changed, 42 insertions(+), 15 deletions(-)

diff --git a/tools/perf/tests/code-reading.c b/tools/perf/tests/code-reading.c
index e2a432b67d52..86d17d2e9e50 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..60f4297ed233 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;
+ 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);
+ cpus->refcnt = 1;
}

return cpus;
@@ -194,14 +197,30 @@ struct cpu_map *cpu_map__dummy_new(void)
if (cpus != NULL) {
cpus->nr = 1;
cpus->map[0] = -1;
+ 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(map->refcnt != 0, "cpu map refcnt disbalanced\n");
+ free(map);
+ }
+}
+
+struct cpu_map *cpu_map__get(struct cpu_map *map)
+{
+ map->refcnt++;
+ return map;
+}
+
+void cpu_map__put(struct cpu_map *map)
+{
+ if (map && --map->refcnt == 0)
+ cpu_map__delete(map);
}

int cpu_map__get_socket(struct cpu_map *map, int idx)
@@ -263,6 +282,7 @@ 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);

+ c->refcnt = 1;
*res = c;
return 0;
}
diff --git a/tools/perf/util/cpumap.h b/tools/perf/util/cpumap.h
index 61a654849002..19fe50b29375 100644
--- a/tools/perf/util/cpumap.h
+++ b/tools/perf/util/cpumap.h
@@ -8,13 +8,13 @@
#include "util/debug.h"

struct cpu_map {
+ int 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 +22,9 @@ 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 dc1dc2c181ef..6b895de1144d 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;
@@ -1337,7 +1337,7 @@ 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 a3e36fc634dc..3bd5769dd7b9 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -902,6 +902,7 @@ 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 88d87bf3049f..c09f178cea63 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1838,7 +1838,7 @@ 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;
}
--
1.9.3