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

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Message-ID: <526E9808.4030607@gmail.com>
Date:	Mon, 28 Oct 2013 10:59:52 -0600
From:	David Ahern <dsahern@...il.com>
To:	Pekka Enberg <penberg@....fi>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
CC:	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" <hegdevasant@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...hat.com>,
	"anton@...hat.com" <anton@...hat.com>,
	"systemtap@...rceware.org" <systemtap@...rceware.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	"aravinda@...ux.vnet.ibm.com" <aravinda@...ux.vnet.ibm.com>
Subject: Re: [PATCH v4 2/3] Support for perf to probe into SDT markers:

On 10/28/13 2:48 AM, Pekka Enberg wrote:
> So I really hope this SDT effort and the ktap effort at least
> make some effort in unifying all the nice functionality that's
> simple to use and easy to discover. I really, really would
> at the end of the day, just 'perf trace' like I 'perf stat' or
> 'perf record'.

Agree. I see user's eyes glaze over with each command line option, and 
we have added aliases to embed some of the details as well as having 
sensible defaults.

I often use perf-list to lookup an exact event name, and I do not want 
to see it taking many seconds to minutes to run (not everyone is running 
on an SSD). I also run perf on many different OS versions with an NFS 
home directory, and do not want to see a cache explosion (I have buildid 
disabled for this reason).

David

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