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bpf: Count missed stats in trace_call_bpf

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Increase misses stats in case bpf array execution is skipped
because of recursion check in trace_call_bpf.

Adding bpf_prog_inc_misses_counters that increase misses
counts for all bpf programs in bpf_prog_array.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Tested-by: Song Liu <song@kernel.org>
Reviewed-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/bpf/20230920213145.1941596-5-jolsa@kernel.org
This commit is contained in:
Jiri Olsa 2023-09-20 23:31:40 +02:00 committed by Andrii Nakryiko
parent 3acf8ace68
commit dd8657894c
2 changed files with 19 additions and 0 deletions
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16
include/linux/bpf.h
View File

@ -2922,6 +2922,22 @@ static inline int sock_map_bpf_prog_query(const union bpf_attr *attr,
#endif /* CONFIG_BPF_SYSCALL */
#endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
static __always_inline void
bpf_prog_inc_misses_counters(const struct bpf_prog_array *array)
{
const struct bpf_prog_array_item *item;
struct bpf_prog *prog;
if (unlikely(!array))
return;
item = &array->items[0];
while ((prog = READ_ONCE(item->prog))) {
bpf_prog_inc_misses_counter(prog);
item++;
}
}
#if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
void bpf_sk_reuseport_detach(struct sock *sk);
int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,

3
kernel/trace/bpf_trace.c
View File

@ -117,6 +117,9 @@ unsigned int trace_call_bpf(struct trace_event_call *call, void *ctx)
* and don't send kprobe event into ring-buffer,
* so return zero here
*/
rcu_read_lock();
bpf_prog_inc_misses_counters(rcu_dereference(call->prog_array));
rcu_read_unlock();
ret = 0;
goto out;
}