Messages in this thread | | | Date | Wed, 11 Nov 2015 23:21:35 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH 2/2] arm64: bpf: add BPF XADD instruction |
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On Wed, Nov 11, 2015 at 11:55:59AM -0800, Alexei Starovoitov wrote: > Therefore things like memory barriers, full set of atomics are not applicable > in bpf world.
There are still plenty of wait-free constructs one can make using them.
Say a barrier/rendezvous construct for knowing when an event has happened on all CPUs.
But if you really do not want any of that, I suppose that is a valid choice.
Is even privileged (e)BPF not allowed things like this? I was thinking the strict no loops stuff was for unpriv (e)BPF only.
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