Date: Fri, 1 May 2015 19:06:23 +0200
From: Ingo Molnar <mingo@kernel.org>
To: Alexei Starovoitov <ast@plumgrid.com>
Cc: Peter Zijlstra <peterz@infradead.org>, Wang Nan <wangnan0@huawei.com>,
        davem@davemloft.net, acme@kernel.org, mingo@redhat.com,
        masami.hiramatsu.pt@hitachi.com, jolsa@kernel.org, lizefan@kernel.org,
        linux-kernel@vger.kernel.org, pi3orama@163.com, hekuang@huawei.com,
        bgregg@netflix.com
Subject: Re: [RFC PATCH 00/22] perf tools: introduce 'perf bpf' command to
 load eBPF programs.
Message-ID: <20150501170623.GB1657@gmail.com>
References: <1430391165-30267-1-git-send-email-wangnan0@huawei.com>
 <554302F0.3070101@plumgrid.com>
 <20150501110659.GE5029@twins.programming.kicks-ass.net>
 <20150501114943.GA24094@gmail.com>
 <5543B037.9070504@plumgrid.com>
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* Alexei Starovoitov <ast@plumgrid.com> wrote:

> On 5/1/15 4:49 AM, Ingo Molnar wrote:
> >
> >* Peter Zijlstra <peterz@infradead.org> wrote:
> >
> >>On Thu, Apr 30, 2015 at 09:37:04PM -0700, Alexei Starovoitov wrote:
> >>>We're also working in parallel on creating a new tracing language
> >>>that together with llvm backend can be used as a single shared library
> >>>that can be called from perf or anything else.
> >>
> >>Gurgh, please also keep normal C an option. [...]
> >
> >Absolutely, I thought there was agreement on that when we started
> >merging all these eBPF patches ...
> >
> >It might be 'simplified C', in that it's just a subset of C, but
> >please don't re-do something that works, especially if it's used to
> >instrument a kernel that is written in C ...
> 
> of course. When did I say that I like 'bird' languages? :)
> By 'new' I mean that we're not trying to port existing tracing
> language like dtrace, systemtap, ktap to bpf.
> I believe dtrace would have been more widely adopted if it didn't
> invent new syntax. We're trying to do a C -- with ++.
> It's C where non-supported things like 'for', 'while', 'asm' are
> actively error-ed by front-end and additional syntactic
> sugar for things that too ugly/verbose in vanilla C are added.

Ok, sounds very good to me!

Thanks,

	Ingo
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