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bpf: Count stats for kprobe_multi programs

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Adding support to gather missed stats for kprobe_multi
programs due to bpf_prog_active protection.

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/20230920213145.1941596-2-jolsa@kernel.org
This commit is contained in:
Jiri Olsa 2023-09-20 23:31:37 +02:00 committed by Andrii Nakryiko
parent e0fa6523e0
commit f915fcb385
1 changed files with 1 additions and 0 deletions
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1
kernel/trace/bpf_trace.c
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@ -2710,6 +2710,7 @@ kprobe_multi_link_prog_run(struct bpf_kprobe_multi_link *link,
int err;
if (unlikely(__this_cpu_inc_return(bpf_prog_active) != 1)) {
bpf_prog_inc_misses_counter(link->link.prog);
err = 0;
goto out;
}