linux-kernel - Re: [PATCH 3/8] perf symbol: Save vmlinux or kallsyms path loaded

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Message-ID: <20131122194047.GF11305@ghostprotocols.net>
Date:	Fri, 22 Nov 2013 16:40:47 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	David Ahern <dsahern@...il.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <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 3/8] perf symbol: Save vmlinux or kallsyms path loaded

Em Fri, Nov 22, 2013 at 12:13:52PM -0700, David Ahern escreveu:
> On 11/22/13, 11:44 AM, Arnaldo Carvalho de Melo wrote:
> >Em Mon, Nov 18, 2013 at 01:32:46PM -0700, 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.

> >What would happen if strdup failed here?

> perf continues on happily. On the timehist command will question
> computation of idle times which require kernel symbols.

> >Why don't we undo anything done so far in this function and return an
> >error?

> In the notion of best effort of continuing. It's not a show stopper
> that strdup failed; it's just not the filename it used for symbols.

So if later on one would need to print that info, it would just show
"unknown"?

- Arnaldo
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