samples/bpf: update tracex[23] examples to use per-cpu maps
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/samples/bpf/tracex3_user.c b/samples/bpf/tracex3_user.c
index 0aaa933..48716f7 100644
--- a/samples/bpf/tracex3_user.c
+++ b/samples/bpf/tracex3_user.c
@@ -20,11 +20,13 @@
static void clear_stats(int fd)
{
+ unsigned int nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
+ __u64 values[nr_cpus];
__u32 key;
- __u64 value = 0;
+ memset(values, 0, sizeof(values));
for (key = 0; key < SLOTS; key++)
- bpf_update_elem(fd, &key, &value, BPF_ANY);
+ bpf_update_elem(fd, &key, values, BPF_ANY);
}
const char *color[] = {
@@ -75,15 +77,20 @@
static void print_hist(int fd)
{
- __u32 key;
- __u64 value;
- __u64 cnt[SLOTS];
- __u64 max_cnt = 0;
+ unsigned int nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
__u64 total_events = 0;
+ long values[nr_cpus];
+ __u64 max_cnt = 0;
+ __u64 cnt[SLOTS];
+ __u64 value;
+ __u32 key;
+ int i;
for (key = 0; key < SLOTS; key++) {
+ bpf_lookup_elem(fd, &key, values);
value = 0;
- bpf_lookup_elem(fd, &key, &value);
+ for (i = 0; i < nr_cpus; i++)
+ value += values[i];
cnt[key] = value;
total_events += value;
if (value > max_cnt)