On Wed, Nov 11, 2015 at 09:49:48AM +0100, Arnd Bergmann wrote:
On Tuesday 10 November 2015 18:52:45 Z Lim wrote:
On Tue, Nov 10, 2015 at 4:42 PM, Alexei Starovoitov
On Tue, Nov 10, 2015 at 04:26:02PM -0800, Shi, Yang wrote:
On 11/10/2015 4:08 PM, Eric Dumazet wrote:
On Tue, 2015-11-10 at 14:41 -0800, Yang Shi wrote:
aarch64 doesn't have native support for XADD instruction, implement it by
the below instruction sequence:
aarch64 supports atomic add in ARMv8.1.
For ARMv8(.0), please consider using LDXR/STXR sequence.
Is it worth optimizing for the 8.1 case? It would add a bit of complexity
to make the code depend on the CPU feature, but it's certainly doable.
What's the atomicity required for? Put another way, what are we racing
with (I thought bpf was single-threaded)? Do we need to worry about
Apologies if these are stupid questions, but all I could find was
samples/bpf/sock_example.c and it didn't help much :(