linux-kernel - Re: [GIT PULL 0/6] perf/core improvements and fixes

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Date:	Fri, 5 Jun 2015 14:05:50 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	"Wangnan (F)" <wangnan0@...wei.com>
Cc:	Alexei Starovoitov <ast@...mgrid.com>, pi3orama <pi3orama@....com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Brendan Gregg <brendan.d.gregg@...il.com>,
	Daniel Borkmann <daniel@...earbox.net>,
	David Ahern <dsahern@...il.com>, He Kuang <hekuang@...wei.com>,
	Jiri Olsa <jolsa@...hat.com>, Kaixu Xia <xiakaixu@...wei.com>,
	Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	Zefan Li <lizefan@...wei.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Alexei Starovoitov <alexei.starovoitov@...il.com>
Subject: Re: [GIT PULL 0/6] perf/core improvements and fixes


* Wangnan (F) <wangnan0@...wei.com> wrote:

> OK. Let's start making a nice UI.

Thanks!

> [...]
>
> One problem I can find is that, the wrapper will make perf depend on llvm. I 
> don't think the compiler will be deployed in production environments... And 
> also, the embedded case...

What dependencies are there?

On the usage side there should be very few outright dependencies: if the llvm 
binary is not available, or doesn't support what you need, or there's no runtime 
environment you can use to build the bytecode, you should display an informative 
error message so that the user knows what is missing and how to install it.

Thanks,

	Ingo
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