Why cannot `f2fs_delete_entry` be traced by bpftrace

Question

I use the following command to trace function f2fs_delete_dentry:

bpftrace -e 'kprobe:f2fs_delete_entry {printf("comm:%s inode:%ld\n", comm, ((struct inode*)arg3)->i_ino); }'

But it does not print anything.

So I use bpftrace -lv "t:f2fs:f2fs_delete_entry" to check it. I prints nothing yet. Why?

Answer 1

Two possibilities I know of:

• That function is not executed while you are tracing.
• This function has multiple call sites. On the path you know is executed, this function has been inlined. Thus, bpftrace is actually tracing only other call sites.