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Re: [PATCH v3 net-next] bpf/verifier: track liveness for pruning

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On 08/15/2017 09:34 PM, Edward Cree wrote:
> State of a register doesn't matter if it wasn't read in reaching an exit;
>   a write screens off all reads downstream of it from all explored_states
>   upstream of it.
> This allows us to prune many more branches; here are some processed insn
>   counts for some Cilium programs:
> Program                  before  after
> bpf_lb_opt_-DLB_L3.o       6515   3361
> bpf_lb_opt_-DLB_L4.o       8976   5176
> bpf_lb_opt_-DUNKNOWN.o     2960   1137
> bpf_lxc_opt_-DDROP_ALL.o  95412  48537
> bpf_lxc_opt_-DUNKNOWN.o  141706  78718
> bpf_netdev.o              24251  17995
> bpf_overlay.o             10999   9385
>
> The runtime is also improved; here are 'time' results in ms:
> Program                  before  after
> bpf_lb_opt_-DLB_L3.o         24      6
> bpf_lb_opt_-DLB_L4.o         26     11
> bpf_lb_opt_-DUNKNOWN.o       11      2
> bpf_lxc_opt_-DDROP_ALL.o   1288    139
> bpf_lxc_opt_-DUNKNOWN.o    1768    234
> bpf_netdev.o                 62     31
> bpf_overlay.o                15     13
>
> Signed-off-by: Edward Cree <ecree@solarflare.com>

Acked-by: Daniel Borkmann <daniel@iogearbox.net>

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[PATCH v3 net-next] bpf/verifier: track liveness for pruning Edward Cree <ecree@solarflare.com> - 2017-08-15 21:40 +0200
  Re: [PATCH v3 net-next] bpf/verifier: track liveness for pruning Daniel Borkmann <daniel@iogearbox.net> - 2017-08-16 00:20 +0200
    Re: [PATCH v3 net-next] bpf/verifier: track liveness for pruning David Miller <davem@davemloft.net> - 2017-08-16 01:40 +0200
  Re: [PATCH v3 net-next] bpf/verifier: track liveness for pruning Edward Cree <ecree@solarflare.com> - 2017-08-18 16:20 +0200
    Re: [PATCH v3 net-next] bpf/verifier: track liveness for pruning Edward Cree <ecree@solarflare.com> - 2017-08-21 20:40 +0200
      Re: [PATCH v3 net-next] bpf/verifier: track liveness for pruning Daniel Borkmann <daniel@iogearbox.net> - 2017-08-21 22:30 +0200
        Re: [PATCH v3 net-next] bpf/verifier: track liveness for pruning Edward Cree <ecree@solarflare.com> - 2017-08-21 22:50 +0200
          Re: [PATCH v3 net-next] bpf/verifier: track liveness for pruning Daniel Borkmann <daniel@iogearbox.net> - 2017-08-21 23:10 +0200
    Re: [PATCH v3 net-next] bpf/verifier: track liveness for pruning Edward Cree <ecree@solarflare.com> - 2017-08-21 22:30 +0200

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