linux-kernel - Re: [RFC PATCH 0/6] perf bpf: Probing with local variable

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Message-ID: <20150506014407.GB10475@kernel.org>
Date:	Tue, 5 May 2015 22:44:07 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	He Kuang <hekuang@...wei.com>, ast@...mgrid.com,
	davem@...emloft.net, mingo@...hat.com, a.p.zijlstra@...llo.nl,
	jolsa@...nel.org, wangnan0@...wei.com, lizefan@...nel.org,
	linux-kernel@...r.kernel.org, pi3orama@....com
Subject: Re: [RFC PATCH 0/6] perf bpf: Probing with local variable

Em Wed, May 06, 2015 at 10:37:37AM +0900, Masami Hiramatsu escreveu:
> On 2015/05/05 19:10, He Kuang wrote:
> >   (79) r3 = *(u64 *)(r6 +88)
> >   (bf) r9 = r3
> >   (bf) r2 = r7
> >   (bf) r3 = r8
> >   (bf) r4 = r9
 
> Hmm, this idea looks good to me, I need to learn what the bpf needs for review.
> BTW, if it is so easily to compose the byte code in perf, can we do it in the
> kernel too? I'd like to check the possibility of replacing the old fetch_arg
> functions with these byte code for optimizing performance and reduce redundant
> functionality. :)

Excellent idea! ;-)

- Arnaldo
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