linux-kernel - Re: [PATCH 08/19] perf symbol: Save vmlinux or kallsyms path loaded

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Date:	Thu, 08 Aug 2013 22:51:22 -0400
From:	David Ahern <dsahern@...il.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
CC:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 08/19] perf symbol: Save vmlinux or kallsyms path loaded

On 8/8/13 11:08 AM, Arnaldo Carvalho de Melo wrote:
> Em Wed, Aug 07, 2013 at 10:50:50PM -0400, David Ahern escreveu:
>> Save vmlinux or kallsyms path loaded using embedded default lookup (ie.,
>> not a user specified path). Upcoming perf sched timehist command requires
>> kernel symbols for properly computing idle times and prints a warning
>> if the kernel symbols are not loaded.
>
> With this we will not know if the user passed something to set those
> variables or if internally we did it, doesn't this break any existing
> code assumption?

I believe this only affects code paths that go to default locations.

I am not aware of any code that looks at the path once the syms are 
loaded. AFAIK the timehist command is the first.

David
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