On Tue, Jun 21, 2022 at 10:28:27PM +0100, Quentin Monnet wrote: > > When I using `bpftool map list` to show what maps user using. bpftool will > > show maps including self created maps. Apart from the "pid_iter.rodata", > > there are also array maps without name, which makes it hard to filter out > > what maps user using. e.g. > > > > # bpftool map list > > 63: array flags 0x0 > > key 4B value 32B max_entries 1 memlock 4096B > > 65: array name pid_iter.rodata flags 0x480 > > key 4B value 4B max_entries 1 memlock 4096B > > btf_id 98 frozen > > pids bpftool(10572) > > 66: array flags 0x0 > > key 4B value 32B max_entries 1 memlock 4096B > > > > So do you have plan to add a special name for the bpftool self created maps? > > Or do you know if there is a way to filter out these maps? > > Hi Hangbin, > > No plan currently. Adding names has been suggested before, but it's > not compatible with some older kernels that don't support map names > [0]. Maybe one solution would be to probe the kernel for map name > support, and to add a name if supported. Hi Quentin, Thanks for the reply. Probe the kernel and add name if supported makes sense to me. Thanks Hangbin > > Other than this I'm not aware of a reliable way to filter out these > maps at the moment. This could probably be done in bpftool since we > should have the ids of the self-generated maps. But I think I'd rather > find a way to add map names, if possible. It would make it easier to > recognise/filter these maps on regular listing, whereas a new option > would be harder for users to discover. > > Quentin > > [0] https://lore.kernel.org/bpf/CAEf4BzY66WPKQbDe74AKZ6nFtZjq5e+G3Ji2egcVytB9R6_sGQ@xxxxxxxxxxxxxx/
