Re: libbpf: pinning multiple progs from the same section

["Toke Høiland-Jørgensen" <toke@redhat.com>]

Gilad Reti <gilad.reti@gmail.com> writes:

> Also, is there a way to set the pin path to all maps/programs at once?
> For example, bpf_object__pin_maps pins all maps at a specific path,
> but as far as I was able to find there is no similar function to set
> the pin path for all maps only (without pinning) so that at loading
> time libbpf will try to reuse all maps. The only way to achieve a
> complete reuse of all maps that I could find is to "reverse engineer"
> libbpf's pin path generation algorithm (i.e. <path>/<map_name>) and
> set the pin path on each map before load.

You can set the 'pinning' attribute in the map definition - add
'__uint(pinning, LIBBPF_PIN_BY_NAME);' to the map struct. By default
this will pin beneath /sys/fs/bpf, but you can customise that by setting
the pin_root_path attribute in bpf_object_open_opts.

-Toke