On Wed, Sep 19, 2018 at 03:39:34PM -0700, Alexei Starovoitov wrote:
> void bpf_prog_kallsyms_del(struct bpf_prog *fp)
> {
> + unsigned long symbol_start, symbol_end;
> + /* mmap_record.filename cannot be NULL and has to be u64 aligned */
> + char buf[sizeof(u64)] = {};
> +
> if (!bpf_prog_kallsyms_candidate(fp))
> return;
>
> spin_lock_bh(&bpf_lock);
> bpf_prog_ksym_node_del(fp->aux);
> spin_unlock_bh(&bpf_lock);
> + bpf_get_prog_addr_region(fp, &symbol_start, &symbol_end);
> + perf_event_mmap_bpf_prog(symbol_start, symbol_end - symbol_start,
> + buf, sizeof(buf));
> }
So perf doesn't normally issue unmap events.. We've talked about doing
that, but so far it's never really need needed I think.
I feels a bit weird to start issuing unmap events for this.
