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authorQiang Wang <wangqiang.wq.frank@bytedance.com>2021-12-27 21:07:13 +0800
committerAndrii Nakryiko <andrii@kernel.org>2022-01-05 15:38:21 -0800
commit51a33c60f1c22c0d2dafad774315ba1537765442 (patch)
treee0db3dd9af7a9781ada553e46fc718f8c2b6f9e4 /tools
parent71cff670baff5cc6a6eeb0181e2cc55579c5e1e0 (diff)
libbpf: Support repeated legacy kprobes on same function
If repeated legacy kprobes on same function in one process, libbpf will register using the same probe name and got -EBUSY error. So append index to the probe name format to fix this problem. Co-developed-by: Chengming Zhou <zhouchengming@bytedance.com> Signed-off-by: Qiang Wang <wangqiang.wq.frank@bytedance.com> Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20211227130713.66933-2-wangqiang.wq.frank@bytedance.com
Diffstat (limited to 'tools')
-rw-r--r--tools/lib/bpf/libbpf.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 26e49e6aa5b1..7f10dd501a52 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -9916,7 +9916,10 @@ static int append_to_file(const char *file, const char *fmt, ...)
static void gen_kprobe_legacy_event_name(char *buf, size_t buf_sz,
const char *kfunc_name, size_t offset)
{
- snprintf(buf, buf_sz, "libbpf_%u_%s_0x%zx", getpid(), kfunc_name, offset);
+ static int index = 0;
+
+ snprintf(buf, buf_sz, "libbpf_%u_%s_0x%zx_%d", getpid(), kfunc_name, offset,
+ __sync_fetch_and_add(&index, 1));
}
static int add_kprobe_event_legacy(const char *probe_name, bool retprobe,