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

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Message-ID: <4C04FF65.8020408@redhat.com>
Date:	Tue, 01 Jun 2010 15:39:01 +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 06/01/2010 02:59 PM, Steven Rostedt wrote:
>
>> 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.
>>
>>      
> Every event gets its own ID. The plugin registers a callback to that ID.
> When the ID is hit, the plugin is executed on that event to display its
> binary format.
>
> This is done after the data has been saved in binary format to a file.
> It may slow down the executing of reading a data file, but it does not
> affect the running of the trace one bit.
>    

I meant that viewing would be slowed down.  It's an important part of 
using ftrace!

How long does the Python formatter take to process 100k or 1M events?

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

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