[LSF/MM/BPF TOPIC] multi uprobe link

[LSF/MM/BPF TOPIC] multi uprobe link

[Jiri Olsa]

We have a usecase to monitor potentially many uprobes and current way of
attaching many uprobes through perf takes long time. It's because there's
extra perf event install/schedule for each uprobe you want to attach.

It'd be great to have a another way to attach multiple uprobes probably by
adding new uprobe_multi link, that would create system wide uprobes directly
and attach bpf program to it.

Although that would not solve all the performance issues with uprobes, it
seems like a good start to solve attach/detach times.

I'd be interested in other people's experiences with uprobes and ideas on
speeding it up. The uprobe_multi link prototype should be done by that time,
hopefully ;-)

thanks,
jirka

Re: [LSF/MM/BPF TOPIC] multi uprobe link

[Andrii Nakryiko]

On Fri, Feb 24, 2023 at 2:39 AM Jiri Olsa <olsajiri@gmail.com> wrote:
>
> We have a usecase to monitor potentially many uprobes and current way of
> attaching many uprobes through perf takes long time. It's because there's
> extra perf event install/schedule for each uprobe you want to attach.
>
> It'd be great to have a another way to attach multiple uprobes probably by
> adding new uprobe_multi link, that would create system wide uprobes directly
> and attach bpf program to it.
>
> Although that would not solve all the performance issues with uprobes, it
> seems like a good start to solve attach/detach times.
>
> I'd be interested in other people's experiences with uprobes and ideas on
> speeding it up. The uprobe_multi link prototype should be done by that time,
> hopefully ;-)

Great! Looking forward to it! Certainly a very useful thing, also for
USDTs which could be inlined in lots of places, so one USDT attachment
is actually a multi-uprobe attachment, in general.

>
> thanks,
> jirka