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

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Message-ID: <52A12421.2040208@zytor.com>
Date:	Thu, 05 Dec 2013 17:10:57 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <andi@...stfloor.org>,
	Alexei Starovoitov <ast@...mgrid.com>
CC:	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 12/05/2013 04:14 PM, Andi Kleen wrote:
> 
> In my experience there are roughly two groups of trace users:
> kernel hackers and users. The kernel hackers want something
> convenient and fast, but for anything complicated or performance
> critical they can always hack the kernel to include custom 
> instrumentation.
> 

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.

	-hpa

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