linux-kernel - Re: [PATCH v2 00/15] tracing: 'hist' triggers

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Date:	Mon, 9 Mar 2015 19:38:36 +0800
From:	He Kuang <hekuang@...wei.com>
To:	Tom Zanussi <tom.zanussi@...ux.intel.com>,
	Alexei Starovoitov <ast@...mgrid.com>
CC:	Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Namhyung Kim <namhyung@...nel.org>,
	"Andi Kleen" <andi@...stfloor.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>
Subject: Re: [PATCH v2 00/15] tracing: 'hist' triggers

hi, Tom

On 2015/3/3 3:55, Tom Zanussi wrote:
> BTW, I've actually tried to play around with the BPF samples/, but it 
> seems they're not actually hooked into the system i.e. the samples 
> Makefile doesn't build them, and it even looks for tools/llvm that's 
> not there. I got as far as getting the latest llvm from the location 
> mentioened in one of the bpf commit messages, but gave up after it 
> told me 'invalid target bpf'. And I couldn't find any documentation on 
> how to set it all up - did I just miss that? Tom 

I'd also encountered the same problem:

--enable-experimental-targets=BPF, 'BPF' letters must be uppercase. Have 
a try.
>> Thanks
>
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