Re: [RFC PATCH 0/6] eBPF JIT for PPC64

On 2016/04/01 03:28PM, Naveen N Rao wrote:

Implement extended BPF JIT for ppc64. We retain the classic BPF JIT for
ppc32 and move ppc64 BE/LE to use the new JIT. Classic BPF filters will
be converted to extended BPF (see convert_filter()) and JIT'ed with the
new compiler.

Most of the existing macros are retained and fixed/enhanced where
appropriate. Patches 1-4 are geared towards this.

Patch 5 breaks out the classic BPF JIT specifics into a separate
bpf_jit32.h header file, while retaining all the generic instruction
macros in bpf_jit.h. Most of these macros can potentially be generalized
and moved to more common code (tagged with a TODO in patch 6).

Patch 6 implements eBPF JIT for ppc64.

As a comparison, here are the test results with the BPF test suite 
kernel module:

With the classic BPF JIT:
test_bpf: Summary: 291 PASSED, 0 FAILED, [85/283 JIT'ed]

and with the extended BPF JIT:
test_bpf: Summary: 291 PASSED, 0 FAILED, [234/283 JIT'ed]

As noted in patch 6, there are still a few more instructions to be 
JIT'ed.


- Naveen