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

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Date:	Fri, 1 Apr 2016 15:54:22 +0530
From:	"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Cc:	oss@...error.net, Matt Evans <matt@...abs.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Paul Mackerras <paulus@...ba.org>,
	Alexei Starovoitov <ast@...com>,
	"David S. Miller" <davem@...emloft.net>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>
Subject: 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