[PATCH 03/26] perf tools: Add reference counting for cpu_map object

From: Jiri Olsa
Date: Thu Jun 18 2015 - 17:55:59 EST

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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@xxxxxxxxxxxxxx
Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
---
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 | 26 ++++++++++++++++++++++++--
tools/perf/util/cpumap.h | 6 +++++-
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, 45 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..d2662d0e7d2e 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 disbalanced\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 a62b3adcc32b..12c69cb1dd89 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 e1cd17c2afab..d63a97c74eaa 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1860,7 +1860,7 @@ 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

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Next message: Arnaldo Carvalho de Melo: "Re: [PATCH V6 02/17] perf tools: Ensure thread-stack is flushed"
Previous message: Jiri Olsa: "[PATCH 10/26] perf stat: Use xyarray for cpu evsel counts"
In reply to: Jiri Olsa: "[PATCH 10/26] perf stat: Use xyarray for cpu evsel counts"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]