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Groups > linux.kernel > #1238357
| From | Alexei Starovoitov <alexei.starovoitov@gmail.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH net-next V2] ARM: net: support BPF_ALU | BPF_MOD instructions in the BPF JIT. |
| Date | 2015-10-02 17:30 +0200 |
| Message-ID | <qfarv-7j6-5@gated-at.bofh.it> (permalink) |
| References | <qfa8b-6Wx-23@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Fri, Oct 02, 2015 at 05:06:47PM +0200, Nicolas Schichan wrote: > For ARMv7 with UDIV instruction support, generate an UDIV instruction > followed by an MLS instruction. > > For other ARM variants, generate code calling a C wrapper similar to > the jit_udiv() function used for BPF_ALU | BPF_DIV instructions. > > Some performance numbers reported by the test_bpf module (the duration > per filter run is reported in nanoseconds, between "jitted:<x>" and > "PASS": > > ARMv7 QEMU nojit: test_bpf: #3 DIV_MOD_KX jited:0 2196 PASS > ARMv7 QEMU jit: test_bpf: #3 DIV_MOD_KX jited:1 104 PASS > ARMv5 QEMU nojit: test_bpf: #3 DIV_MOD_KX jited:0 2176 PASS > ARMv5 QEMU jit: test_bpf: #3 DIV_MOD_KX jited:1 1104 PASS > ARMv5 kirkwood nojit: test_bpf: #3 DIV_MOD_KX jited:0 1103 PASS > ARMv5 kirkwood jit: test_bpf: #3 DIV_MOD_KX jited:1 311 PASS > > Signed-off-by: Nicolas Schichan <nschichan@freebox.fr> run-time check for zero is there, so looks good to me Acked-by: Alexei Starovoitov <ast@kernel.org> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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[PATCH net-next V2] ARM: net: support BPF_ALU | BPF_MOD instructions in the BPF JIT. Nicolas Schichan <nschichan@freebox.fr> - 2015-10-02 17:10 +0200 Re: [PATCH net-next V2] ARM: net: support BPF_ALU | BPF_MOD instructions in the BPF JIT. Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2015-10-02 17:30 +0200 Re: [PATCH net-next V2] ARM: net: support BPF_ALU | BPF_MOD instructions in the BPF JIT. David Miller <davem@davemloft.net> - 2015-10-05 15:50 +0200
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