linux-kernel - Re: [PATCH 5/7] perf tools: Introduce perf_target_

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Date:	Tue, 08 May 2012 10:57:12 +0900
From:	Namhyung Kim <namhyung.kim@....com>
To:	David Ahern <dsahern@...il.com>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/7] perf tools: Introduce perf_target__strerror()

Hi,

On Mon, 07 May 2012 11:43:09 -0600, David Ahern wrote:
> On 5/7/12 11:29 AM, Arnaldo Carvalho de Melo wrote:
>> Em Mon, May 07, 2012 at 02:09:02PM +0900, Namhyung Kim escreveu:
>>> The perf_target__strerror() sets @buf to a string that
>>> describes the (perf_target-specific) error condition
>>> that is passed via @errnum.
>>>
>>> This is similar to strerror_r() and does same thing if
>>> @errnum has a standard errno value.
>>
>> This has a problem: why should I be warned when I do, as root:
>>
>> # perf top -u acme
>>
>> It warns me that "UID switch overriding SYSTEM", yeah, right that is
>> what I asked, no need to tell me that :-)
>>
>> So what is missing in this case is that top starts with system_wide set,
>> not from the command line.
>>
> Seems like we should avoid the propagation of the errnos beyond the
> depths of the library part. For perf-top why not default to nothing
> set and if the user does not request one, set system wide. i.e,
> following Patch 6 in this set do:
>
> if (perf_target__none(&top.target)
>     top.target.system_wide = true;
>

Thanks for catching this (and sorry for not testing thoroughly).

Yes, this would make more sense if it goes to the patch 1. Now I see
that Arnaldo fixed it on patch 1 but forgot to update on patch 6 :).

Thanks,
Namhyung

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