linux-kernel - Re: [PATCH v2 1/3] perf/sdt : Listing of SDT markers by perf

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Date:	Mon, 21 Jul 2014 11:38:40 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Hemant Kumar <hemant@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, srikar@...ux.vnet.ibm.com,
	peterz@...radead.org, oleg@...hat.com,
	hegdevasant@...ux.vnet.ibm.com, mingo@...hat.com, anton@...hat.com,
	systemtap@...rceware.org, masami.hiramatsu.pt@...achi.com,
	aravinda@...ux.vnet.ibm.com, penberg@....fi
Subject: Re: [PATCH v2 1/3] perf/sdt : Listing of SDT markers by perf

Hi Andi,

On Fri, 18 Jul 2014 10:50:45 -0700, Andi Kleen wrote:
> Hemant Kumar <hemant@...ux.vnet.ibm.com> writes:
>> +/*
>> + * Finds out the libraries present in a system as shown by the command
>> + * "ldconfig --print-cache". Uses "=>" and '/' to find out the start of a
>> + * dso path.
>> + */
>
> This seems like a hack. How would that handle chroot, containers
> etc. ?

[SNIP]
>> +/*
>> + * Obtain the list of paths from the PATH env variable
>> + */
>
> Same as above. This probably needs to be more configurable to handle
> more ways to find binaries.

Agreed.  What about not to be smart?  IOW, just let users specify
directories and/or files to be scanned.  Maybe we can use it like:

  perf list sdt --scan $PATH

or

  perf sdt-cache --scan /lib:/lib64


We can add some wrapper or default directory later if needed.


Thanks,
Namhyung
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