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perf evlist: Add thread_map__nr() helper

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Introduce and use the thread_map__nr() function to protect a possible
NULL pointer dereference and cleanup the code a bit.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1362987798-24969-3-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2013-03-11 16:43:14 +09:00 committed by Arnaldo Carvalho de Melo
parent 85397956de
commit b3a319d528
3 changed files with 30 additions and 16 deletions
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4
tools/perf/builtin-stat.c
View File

@ -249,7 +249,7 @@ static int read_counter_aggr(struct perf_evsel *counter)
int i;
if (__perf_evsel__read(counter, perf_evsel__nr_cpus(counter),
evsel_list->threads->nr, scale) < 0)
thread_map__nr(evsel_list->threads), scale) < 0)
return -1;
for (i = 0; i < 3; i++)
@ -488,7 +488,7 @@ static int __run_perf_stat(int argc __maybe_unused, const char **argv)
list_for_each_entry(counter, &evsel_list->entries, node) {
read_counter_aggr(counter);
perf_evsel__close_fd(counter, perf_evsel__nr_cpus(counter),
evsel_list->threads->nr);
thread_map__nr(evsel_list->threads));
}
}

37
tools/perf/util/evlist.c
View File

@ -227,12 +227,14 @@ void perf_evlist__disable(struct perf_evlist *evlist)
{
int cpu, thread;
struct perf_evsel *pos;
int nr_cpus = cpu_map__nr(evlist->cpus);
int nr_threads = thread_map__nr(evlist->threads);
for (cpu = 0; cpu < cpu_map__nr(evlist->cpus); cpu++) {
for (cpu = 0; cpu < nr_cpus; cpu++) {
list_for_each_entry(pos, &evlist->entries, node) {
if (!perf_evsel__is_group_leader(pos))
continue;
for (thread = 0; thread < evlist->threads->nr; thread++)
for (thread = 0; thread < nr_threads; thread++)
ioctl(FD(pos, cpu, thread),
PERF_EVENT_IOC_DISABLE, 0);
}
@ -243,12 +245,14 @@ void perf_evlist__enable(struct perf_evlist *evlist)
{
int cpu, thread;
struct perf_evsel *pos;
int nr_cpus = cpu_map__nr(evlist->cpus);
int nr_threads = thread_map__nr(evlist->threads);
for (cpu = 0; cpu < cpu_map__nr(evlist->cpus); cpu++) {
for (cpu = 0; cpu < nr_cpus; cpu++) {
list_for_each_entry(pos, &evlist->entries, node) {
if (!perf_evsel__is_group_leader(pos))
continue;
for (thread = 0; thread < evlist->threads->nr; thread++)
for (thread = 0; thread < nr_threads; thread++)
ioctl(FD(pos, cpu, thread),
PERF_EVENT_IOC_ENABLE, 0);
}
@ -257,7 +261,9 @@ void perf_evlist__enable(struct perf_evlist *evlist)
static int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)
{
int nfds = cpu_map__nr(evlist->cpus) * evlist->threads->nr * evlist->nr_entries;
int nr_cpus = cpu_map__nr(evlist->cpus);
int nr_threads = thread_map__nr(evlist->threads);
int nfds = nr_cpus * nr_threads * evlist->nr_entries;
evlist->pollfd = malloc(sizeof(struct pollfd) * nfds);
return evlist->pollfd != NULL ? 0 : -ENOMEM;
}
@ -417,7 +423,7 @@ static int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
{
evlist->nr_mmaps = cpu_map__nr(evlist->cpus);
if (cpu_map__all(evlist->cpus))
evlist->nr_mmaps = evlist->threads->nr;
evlist->nr_mmaps = thread_map__nr(evlist->threads);
evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
return evlist->mmap != NULL ? 0 : -ENOMEM;
}
@ -442,11 +448,13 @@ static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot, int m
{
struct perf_evsel *evsel;
int cpu, thread;
int nr_cpus = cpu_map__nr(evlist->cpus);
int nr_threads = thread_map__nr(evlist->threads);
for (cpu = 0; cpu < cpu_map__nr(evlist->cpus); cpu++) {
for (cpu = 0; cpu < nr_cpus; cpu++) {
int output = -1;
for (thread = 0; thread < evlist->threads->nr; thread++) {
for (thread = 0; thread < nr_threads; thread++) {
list_for_each_entry(evsel, &evlist->entries, node) {
int fd = FD(evsel, cpu, thread);
@ -470,7 +478,7 @@ static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot, int m
return 0;
out_unmap:
for (cpu = 0; cpu < cpu_map__nr(evlist->cpus); cpu++) {
for (cpu = 0; cpu < nr_cpus; cpu++) {
if (evlist->mmap[cpu].base != NULL) {
munmap(evlist->mmap[cpu].base, evlist->mmap_len);
evlist->mmap[cpu].base = NULL;
@ -483,8 +491,9 @@ static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot, in
{
struct perf_evsel *evsel;
int thread;
int nr_threads = thread_map__nr(evlist->threads);
for (thread = 0; thread < evlist->threads->nr; thread++) {
for (thread = 0; thread < nr_threads; thread++) {
int output = -1;
list_for_each_entry(evsel, &evlist->entries, node) {
@ -509,7 +518,7 @@ static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot, in
return 0;
out_unmap:
for (thread = 0; thread < evlist->threads->nr; thread++) {
for (thread = 0; thread < nr_threads; thread++) {
if (evlist->mmap[thread].base != NULL) {
munmap(evlist->mmap[thread].base, evlist->mmap_len);
evlist->mmap[thread].base = NULL;
@ -610,7 +619,7 @@ int perf_evlist__apply_filters(struct perf_evlist *evlist)
struct perf_evsel *evsel;
int err = 0;
const int ncpus = cpu_map__nr(evlist->cpus),
nthreads = evlist->threads->nr;
nthreads = thread_map__nr(evlist->threads);
list_for_each_entry(evsel, &evlist->entries, node) {
if (evsel->filter == NULL)
@ -629,7 +638,7 @@ int perf_evlist__set_filter(struct perf_evlist *evlist, const char *filter)
struct perf_evsel *evsel;
int err = 0;
const int ncpus = cpu_map__nr(evlist->cpus),
nthreads = evlist->threads->nr;
nthreads = thread_map__nr(evlist->threads);
list_for_each_entry(evsel, &evlist->entries, node) {
err = perf_evsel__set_filter(evsel, ncpus, nthreads, filter);
@ -726,7 +735,7 @@ int perf_evlist__open(struct perf_evlist *evlist)
return 0;
out_err:
ncpus = cpu_map__nr(evlist->cpus);
nthreads = evlist->threads ? evlist->threads->nr : 1;
nthreads = thread_map__nr(evlist->threads);
list_for_each_entry_reverse(evsel, &evlist->entries, node)
perf_evsel__close(evsel, ncpus, nthreads);

5
tools/perf/util/thread_map.h
View File

@ -21,4 +21,9 @@ void thread_map__delete(struct thread_map *threads);
size_t thread_map__fprintf(struct thread_map *threads, FILE *fp);
static inline int thread_map__nr(struct thread_map *threads)
{
return threads ? threads->nr : 1;
}
#endif /* __PERF_THREAD_MAP_H */