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Subject[PATCH 03/18] perf kmem: Remove die() calls
Date
From: Arnaldo Carvalho de Melo <acme@redhat.com>

Just use pr_err() + return -1 and perf_session__process_events to abort
when some event would call die(), then let the perf's main() exit doing
whatever it needs.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
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-i7rhuqfwshjiwc9gr9m1vov4@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-kmem.c | 108 ++++++++++++++++++++++++++++-----------------
1 file changed, 67 insertions(+), 41 deletions(-)

diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
index fc6607b..ad9f520 100644
--- a/tools/perf/builtin-kmem.c
+++ b/tools/perf/builtin-kmem.c
@@ -58,41 +58,52 @@ static unsigned long nr_allocs, nr_cross_allocs;

#define PATH_SYS_NODE "/sys/devices/system/node"

-static void init_cpunode_map(void)
+static int init_cpunode_map(void)
{
FILE *fp;
- int i;
+ int i, err = -1;

fp = fopen("/sys/devices/system/cpu/kernel_max", "r");
if (!fp) {
max_cpu_num = 4096;
- return;
+ return 0;
+ }
+
+ if (fscanf(fp, "%d", &max_cpu_num) < 1) {
+ pr_err("Failed to read 'kernel_max' from sysfs");
+ goto out_close;
}

- if (fscanf(fp, "%d", &max_cpu_num) < 1)
- die("Failed to read 'kernel_max' from sysfs");
max_cpu_num++;

cpunode_map = calloc(max_cpu_num, sizeof(int));
- if (!cpunode_map)
- die("calloc");
+ if (!cpunode_map) {
+ pr_err("%s: calloc failed\n", __func__);
+ goto out_close;
+ }
+
for (i = 0; i < max_cpu_num; i++)
cpunode_map[i] = -1;
+
+ err = 0;
+out_close:
fclose(fp);
+ return err;
}

-static void setup_cpunode_map(void)
+static int setup_cpunode_map(void)
{
struct dirent *dent1, *dent2;
DIR *dir1, *dir2;
unsigned int cpu, mem;
char buf[PATH_MAX];

- init_cpunode_map();
+ if (init_cpunode_map())
+ return -1;

dir1 = opendir(PATH_SYS_NODE);
if (!dir1)
- return;
+ return -1;

while ((dent1 = readdir(dir1)) != NULL) {
if (dent1->d_type != DT_DIR ||
@@ -112,10 +123,11 @@ static void setup_cpunode_map(void)
closedir(dir2);
}
closedir(dir1);
+ return 0;
}

-static void insert_alloc_stat(unsigned long call_site, unsigned long ptr,
- int bytes_req, int bytes_alloc, int cpu)
+static int insert_alloc_stat(unsigned long call_site, unsigned long ptr,
+ int bytes_req, int bytes_alloc, int cpu)
{
struct rb_node **node = &root_alloc_stat.rb_node;
struct rb_node *parent = NULL;
@@ -139,8 +151,10 @@ static void insert_alloc_stat(unsigned long call_site, unsigned long ptr,
data->bytes_alloc += bytes_alloc;
} else {
data = malloc(sizeof(*data));
- if (!data)
- die("malloc");
+ if (!data) {
+ pr_err("%s: malloc failed\n", __func__);
+ return -1;
+ }
data->ptr = ptr;
data->pingpong = 0;
data->hit = 1;
@@ -152,9 +166,10 @@ static void insert_alloc_stat(unsigned long call_site, unsigned long ptr,
}
data->call_site = call_site;
data->alloc_cpu = cpu;
+ return 0;
}

-static void insert_caller_stat(unsigned long call_site,
+static int insert_caller_stat(unsigned long call_site,
int bytes_req, int bytes_alloc)
{
struct rb_node **node = &root_caller_stat.rb_node;
@@ -179,8 +194,10 @@ static void insert_caller_stat(unsigned long call_site,
data->bytes_alloc += bytes_alloc;
} else {
data = malloc(sizeof(*data));
- if (!data)
- die("malloc");
+ if (!data) {
+ pr_err("%s: malloc failed\n", __func__);
+ return -1;
+ }
data->call_site = call_site;
data->pingpong = 0;
data->hit = 1;
@@ -190,11 +207,12 @@ static void insert_caller_stat(unsigned long call_site,
rb_link_node(&data->node, parent, node);
rb_insert_color(&data->node, &root_caller_stat);
}
+
+ return 0;
}

-static void perf_evsel__process_alloc_event(struct perf_evsel *evsel,
- struct perf_sample *sample,
- int node)
+static int perf_evsel__process_alloc_event(struct perf_evsel *evsel,
+ struct perf_sample *sample, int node)
{
struct event_format *event = evsel->tp_format;
void *data = sample->raw_data;
@@ -209,8 +227,9 @@ static void perf_evsel__process_alloc_event(struct perf_evsel *evsel,
bytes_req = raw_field_value(event, "bytes_req", data);
bytes_alloc = raw_field_value(event, "bytes_alloc", data);

- insert_alloc_stat(call_site, ptr, bytes_req, bytes_alloc, cpu);
- insert_caller_stat(call_site, bytes_req, bytes_alloc);
+ if (insert_alloc_stat(call_site, ptr, bytes_req, bytes_alloc, cpu) ||
+ insert_caller_stat(call_site, bytes_req, bytes_alloc))
+ return -1;

total_requested += bytes_req;
total_allocated += bytes_alloc;
@@ -222,6 +241,7 @@ static void perf_evsel__process_alloc_event(struct perf_evsel *evsel,
nr_cross_allocs++;
}
nr_allocs++;
+ return 0;
}

static int ptr_cmp(struct alloc_stat *, struct alloc_stat *);
@@ -252,8 +272,8 @@ static struct alloc_stat *search_alloc_stat(unsigned long ptr,
return NULL;
}

-static void perf_evsel__process_free_event(struct perf_evsel *evsel,
- struct perf_sample *sample)
+static int perf_evsel__process_free_event(struct perf_evsel *evsel,
+ struct perf_sample *sample)
{
unsigned long ptr = raw_field_value(evsel->tp_format, "ptr",
sample->raw_data);
@@ -261,41 +281,43 @@ static void perf_evsel__process_free_event(struct perf_evsel *evsel,

s_alloc = search_alloc_stat(ptr, 0, &root_alloc_stat, ptr_cmp);
if (!s_alloc)
- return;
+ return 0;

if ((short)sample->cpu != s_alloc->alloc_cpu) {
s_alloc->pingpong++;

s_caller = search_alloc_stat(0, s_alloc->call_site,
&root_caller_stat, callsite_cmp);
- assert(s_caller);
+ if (!s_caller)
+ return -1;
s_caller->pingpong++;
}
s_alloc->alloc_cpu = -1;
+
+ return 0;
}

-static void perf_evsel__process_kmem_event(struct perf_evsel *evsel,
- struct perf_sample *sample)
+static int perf_evsel__process_kmem_event(struct perf_evsel *evsel,
+ struct perf_sample *sample)
{
struct event_format *event = evsel->tp_format;

if (!strcmp(event->name, "kmalloc") ||
!strcmp(event->name, "kmem_cache_alloc")) {
- perf_evsel__process_alloc_event(evsel, sample, 0);
- return;
+ return perf_evsel__process_alloc_event(evsel, sample, 0);
}

if (!strcmp(event->name, "kmalloc_node") ||
!strcmp(event->name, "kmem_cache_alloc_node")) {
- perf_evsel__process_alloc_event(evsel, sample, 1);
- return;
+ return perf_evsel__process_alloc_event(evsel, sample, 1);
}

if (!strcmp(event->name, "kfree") ||
!strcmp(event->name, "kmem_cache_free")) {
- perf_evsel__process_free_event(evsel, sample);
- return;
+ return perf_evsel__process_free_event(evsel, sample);
}
+
+ return 0;
}

static int process_sample_event(struct perf_tool *tool __used,
@@ -314,8 +336,7 @@ static int process_sample_event(struct perf_tool *tool __used,

dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);

- perf_evsel__process_kmem_event(evsel, sample);
- return 0;
+ return perf_evsel__process_kmem_event(evsel, sample);
}

static struct perf_tool perf_kmem = {
@@ -613,8 +634,10 @@ static int sort_dimension__add(const char *tok, struct list_head *list)
for (i = 0; i < NUM_AVAIL_SORTS; i++) {
if (!strcmp(avail_sorts[i]->name, tok)) {
sort = malloc(sizeof(*sort));
- if (!sort)
- die("malloc");
+ if (!sort) {
+ pr_err("%s: malloc failed\n", __func__);
+ return -1;
+ }
memcpy(sort, avail_sorts[i], sizeof(*sort));
list_add_tail(&sort->list, list);
return 0;
@@ -629,8 +652,10 @@ static int setup_sorting(struct list_head *sort_list, const char *arg)
char *tok;
char *str = strdup(arg);

- if (!str)
- die("strdup");
+ if (!str) {
+ pr_err("%s: strdup failed\n", __func__);
+ return -1;
+ }

while (true) {
tok = strsep(&str, ",");
@@ -758,7 +783,8 @@ int cmd_kmem(int argc, const char **argv, const char *prefix __used)
if (!strncmp(argv[0], "rec", 3)) {
return __cmd_record(argc, argv);
} else if (!strcmp(argv[0], "stat")) {
- setup_cpunode_map();
+ if (setup_cpunode_map())
+ return -1;

if (list_empty(&caller_sort))
setup_sorting(&caller_sort, default_sort_order);
--
1.7.9.2.358.g22243


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