linux-kernel - Re: [RFC PATCH tip 0/5] tracing filters with BPF

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Message-ID: <CAMEtUuyBRTsP59+g_qCxxFs=dzP+1ZJwBv+4=znxkJcyi3RBRA@mail.gmail.com>
Date:	Fri, 6 Dec 2013 17:12:56 -0800
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Tom Zanussi <tom.zanussi@...ux.intel.com>,
	Jovi Zhangwei <jovi.zhangwei@...il.com>,
	Eric Dumazet <edumazet@...gle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH tip 0/5] tracing filters with BPF

On Thu, Dec 5, 2013 at 5:20 PM, Andi Kleen <andi@...stfloor.org> wrote:
> "H. Peter Anvin" <hpa@...or.com> writes:
>>
>> Not to mention that in that case we might as well -- since we need a
>> compiler anyway -- generate the machine code in user space; the JIT
>> solution really only is useful if it can provide something that we can't
>> do otherwise, e.g. enable it in secure boot environments.
>
> I can see there may be some setups which don't have a compiler
> (e.g. I know some people don't use systemtap because of that)
> But this needs a custom gcc install too as far as I understand.

fyi custom gcc is a single 13M binary. It doesn't depend on any
include files or any libraries.
and can be easily packaged together with perf... even for embedded environment.
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