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samples/bpf: update tracex[23] examples to use per-cpu maps

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Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexei Starovoitov
2016-02-01 22:39:58 -08:00
committed by David S. Miller
parent df570f5772
commit 3059303f59
4 changed files with 25 additions and 13 deletions
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21
samples/bpf/tracex3_user.c
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@@ -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_banner(void)
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)