Re: Question about BPF map type BPF_MAP_TYPE_PERCPU_HASH

Yonghong Song

On Thu, Jan 31, 2019 at 12:09 AM Raga lahari <ragalahari.potti@...> wrote:

Hi everyone,

I am using BPF_MAP_TYPE_HASH in BPF map definition and my program is working as expected.

I have read eBPF-map type BPF_MAP_TYPE_PERCPU_HASH allows for lock free uses of hash-tables in eBPF for high performance needs.

I am trying to modify BPF map type from BPF_MAP_TYPE_HASH to BPF_MAP_TYPE_PERCPU_HASH. But, when I run the program, I am getting issues in BPF map iteration (using bpf_map_get_next_key)

Can someone help me to know any points need to consider to use BPF_MAP_TYPE_PERCPU_HASH map type .
You can take a look at bcc/tests/cc/{,,}.
There are a few examples there testing percpu maps.



Join { to automatically receive all group messages.