linux-kernel - Re: Re: [PATCH v4 2/3] Support for perf to probe into SDT markers:

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Message-ID: <CAOJsxLFX3zHT5tc9JgSteCqASEMJbCuhp9DhL_Afma=8ygTjWg@mail.gmail.com>
Date:	Tue, 29 Oct 2013 21:54:41 +0200
From:	Pekka Enberg <penberg@...nel.org>
To:	Mark Wielaard <mjw@...hat.com>
Cc:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Hemant Kumar <hkshaw@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Oleg Nesterov <oleg@...hat.com>,
	hegdevasant@...ux.vnet.ibm.com, Ingo Molnar <mingo@...hat.com>,
	Anton Arapov <anton@...hat.com>, systemtap@...rceware.org,
	Namhyung Kim <namhyung@...nel.org>, aravinda@...ux.vnet.ibm.com
Subject: Re: Re: [PATCH v4 2/3] Support for perf to probe into SDT markers:

On Tue, Oct 29, 2013 at 4:51 PM, Mark Wielaard <mjw@...hat.com> wrote:
> A nice user case to think about when designing this interface might be
> the java hotspot jvm (libjvm.so). It has SDT markers with the same name
> that might occur at multiple addresses depending on code path taken or
> compiler optimization. And there are multiple libjvm.so variants
> depending on whether the user uses the client or server VM. And users
> often have multiple major versions installed (both 1.6 and 1.7 are
> currently being shipped by some distros and can be installed in
> parallel).
>
> Normally a user that wants to monitor say the hotspot:gc__begin SDT
> probe wants to see that probe in whatever code path it happens and in
> whatever libjvm.so happens to be running (client or server and 1.6 or
> 1.7 version). But might still want to be able to specify a specific
> variant.

Agreed, it's an excellent use case.
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