linux-kernel - Re: [PATCH -tip 3/4] perf script: add the option to show the offset of symbols

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Date:	Thu, 30 Jun 2011 09:42:41 -0600
From:	David Ahern <dsahern@...il.com>
To:	Akihiro Nagai <akihiro.nagai.hw@...achi.com>
CC:	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	yrl.pp-manager.tt@...achi.com, Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH -tip 3/4] perf script: add the option to show the offset
 of symbols

On 06/29/2011 10:44 PM, Akihiro Nagai wrote:
>>>> @@ -346,12 +348,15 @@ static void print_sample_addr(union perf_event
>>>> *event,
>>>>           al.sym = map__find_symbol(al.map, al.addr, NULL);
>>>>
>>>>       if (PRINT_FIELD(SYM)) {
>>>> -        if (al.sym&&  al.sym->name)
>>>> +        printf(" ");
>>>> +        if (al.sym&&  al.sym->name) {
>>>>               symname = al.sym->name;
>>>> -        else
>>>> -            symname = "";
>>>
>>> dropping the else path will cause columns to misalign when ip's do not
>>> resolve.
> I see.
> I'd like to add a magic word that indicates perf-script failed to
> resolve the symbol.
> For example, '[unknown]'.

ok. constant number of fields would make secondary analysis tools easier.

David
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