linux-kernel - Re: [PATCH] perf machine: Search for modules in %s/lib/modules/%s

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Message-ID: <871twztacr.fsf@sejong.aot.lge.com>
Date:	Tue, 15 Apr 2014 14:44:52 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Richard Yao <ryao@...too.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Adrian Hunter <adrian.hunter@...el.com>,
	David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...hat.com>,
	Stephane Eranian <eranian@...gle.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf machine: Search for modules in %s/lib/modules/%s

Hi Richard,

On Thu, 10 Apr 2014 12:52:59 -0400, Richard Yao wrote:
> Modules installed outside of the kernel's build system should go into
> "%s/lib/modules/%s/extra", but at present, perf will only look at them
> when they are in "%s/lib/modules/%s/kernel". Lets encourage good
> citizenship by relaxing this requirement to "%s/lib/modules/%s". This
> way open source modules that are out-of-tree have no incentive to start
> populating a directory reserved for in-kernle modules and I can stop hex
> editing my system's perf binary when profiling OSS out-of-tree modules.

But it'll make the perf traverses all the source and build directories
too, right?  I don't think it's a right thing to do.

Maybe we can also change stat() in map_groups__set_modules_path_dir() to
lstat() so that it cannot go to unwanted directories in that case.  Or
else, just checking "kernel" and "extra" directories will work.

Thanks,
Namhyung
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