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Date: Mon, 12 Mar 2012 09:52:04 -0600
From: David Ahern <dsahern@gmail.com>
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To: Namhyung Kim <namhyung.kim@lge.com>
CC: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
        Ingo Molnar <mingo@elte.hu>, Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Paul Mackerras <paulus@samba.org>, Namhyung Kim <namhyung@gmail.com>,
        LKML <linux-kernel@vger.kernel.org>
Subject: Re: [RFD] perf: Integrate logging facilities
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On 3/12/12 3:58 AM, Namhyung Kim wrote:
> This is a rough idea and there can be things I am missing. So I need to
> listen to your advices.

What Arnaldo proposed was having core, library code return error codes 
and not print anything to the user. Higher layers (commands only?) can 
take the return error code and pass it to perf_<subsystem>_strerror() to 
dump a user friendly string for the error. See

http://lkml.org/lkml/2012/2/13/302

David