linux-kernel - Re: perf top using /proc/kcore

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Date:	Tue, 15 Oct 2013 09:13:37 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
CC:	David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: perf top using /proc/kcore

On 15/10/13 05:09, Arnaldo Carvalho de Melo wrote:
> Hi Adrian,
> 
> 	While testing 'perf top -U' to reply a message in another thread
> I noticed that ksm symbols appeared as '[kernel]', and only when I tried
> 'perf top -U -v' to look at the DSO long name I noticed that it was...
> /proc/kcore.
> 
> 	Question is: since we have access to /proc/modules, can't we
> parse that, as when we have access to vmlinux, and recreate the mmaps,
> etc, and see:
> 
> 	[module]  symbol
> 
> 	Instead of grouping everything into a single [kernel] bucket?

I would suggest just splitting the maps and giving them names, rather than
splitting the dso as well.  That would mean changing places that have:

	map->dso->short_name

to

	map->name ? map->name : map->dso->short_name


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