On Fri, Jun 27, 2014 at 5:06 PM, Alexei Starovoitov <a...@plumgrid.com> wrote: > this socket filter example does: > > - creates a hashtable in kernel with key 4 bytes and value 8 bytes > > - populates map[6] = 0; map[17] = 0; // 6 - tcp_proto, 17 - udp_proto > > - loads eBPF program: > r0 = skb[14 + 9]; // load one byte of ip->proto > *(u32*)(fp - 4) = r0; > value = bpf_map_lookup_elem(map_id, fp - 4); > if (value) > (*(u64*)value) += 1;
In the code below, this is XADD. Is there anything that validates that shared things like this can only be poked at by atomic operations? --Andy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
