linux-kernel - Re: Perf trace event parse errors for KVM events

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Message-ID: <4C04C739.8050607@redhat.com>
Date:	Tue, 01 Jun 2010 11:39:21 +0300
From:	Avi Kivity <avi@...hat.com>
To:	rostedt@...dmis.org
CC:	Stefan Hajnoczi <stefanha@...il.com>,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, Frederic Weisbecker <fweisbec@...il.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Stefan Hajnoczi <stefanha@...ux.vnet.ibm.com>,
	Johannes Berg <johannes.berg@...el.com>,
	Darren Hart <darren@...art.com>
Subject: Re: Perf trace event parse errors for KVM events

On 05/30/2010 06:34 PM, Steven Rostedt wrote:
>
>> Cool.  May make sense to use simpler formatting in the kernel, and use
>> trace-cmd plugins for the complicated cases.
>>
>> It does raise issues with ABIs.  Can trace-cmd read plugins from
>> /lib/modules/*?  We can then distribute the plugins with the kernel.
>>
>>      
> We probably could do that. Perhaps if we can port the python code to
> perf, then it would work for both. Then the plugins could be just python
> scripts, (or binary .so modules) and have a tools/plugins dir?
>
> The python part probably would be easier to port, since the .so modules
> are a bit more specific to trace-cmd.
>    

One concern is performance.  Traces tend to be long, and running python 
code on each line will be slow.

If trace-cmd integrates a pager and a search mechanism that looks at the 
binary data instead of the text, we could format only the lines that are 
displayed.  But that is going to be a lot of work and I don't think it's 
worth the effort.

-- 
error compiling committee.c: too many arguments to function

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