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

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Date:	Mon, 21 Jul 2014 15:10:26 +0530
From:	Hemant Kumar <hemant@...ux.vnet.ibm.com>
To:	Namhyung Kim <namhyung@...il.com>, Andi Kleen <andi@...stfloor.org>
CC:	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 and Namhyung,

On 07/21/2014 08:08 AM, Namhyung Kim wrote:
> 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

Agreed, that we need to have options to add more binaries present in
directories other than the default directories.

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

But wasn't the whole point of changing to this patchset was to make SDT 
events more
prominent, i.e., to display the SDTs present in the whole system?

So, what I am trying to say is that, we already have the PATH bins and 
libs' dsos, if
we need to add more, we can use :
     perf sdt-cache --scan [dir1][:dir2]...

What would you suggest we do?

-- 
Thanks,
Hemant Kumar

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