[CRIU] Checkpoint/Restore of BPF Map Data

[Abhishek Vijeev]

This is great, thank you Anton. Will check it out!

On Mon, Jun 22, 2020 at 10:45 PM Anton Protopopov <aspsk2 at gmail.com> wrote:
>
> пн, 22 июн. 2020 г. в 13:01, Abhishek Vijeev <abhishek.vijeev at gmail.com>:
> >
> > + CRIU Mailing List
> >
> >
> > On Mon, Jun 22, 2020 at 10:29 PM Abhishek Vijeev
> > <abhishek.vijeev at gmail.com> wrote:
> > >
> > > Hi,
> > >
> > > I've been working with the CRIU project to enable CRIU to checkpoint
> > > and restore BPF map files.
> > > (https://github.com/checkpoint-restore/criu/issues/777).
> > >
> > > A key component of the solution involves dumping the data contained in
> > > BPF maps. However, I have
> > > been unable to do this due to the following reason - as far as I'm
> > > aware, Linux does not provide an
> > > interface to directly retrieve the key-value pairs stored in a BPF map
> > > without prior knowledge about
> > > the nature of data stored in it.
>
> Try BPF_MAP_LOOKUP_BATCH, here is an example:
> https://github.com/iovisor/bcc/blob/master/libbpf-tools/syscount.c#L193
> (the bpf_map_lookup_and_delete_batch is used there, but
> bpf_map_lookup_batch case should be the same).