linux-kernel - Re: [PATCH] perf, x86: Enabled PEBS event to be exported in a raw format

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Date:	Fri, 29 Jun 2012 09:32:53 +0800
From:	Feng Tang <feng.tang@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Andi Kleen <ak@...ux.intel.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Ingo Molnar <mingo@...e.hu>, <linux-kernel@...r.kernel.org>,
	<x86@...nel.org>, Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH] perf, x86: Enabled PEBS event to be exported in a raw
 format

On Thu, 28 Jun 2012 22:51:37 +0200
Peter Zijlstra <peterz@...radead.org> wrote:

> On Thu, 2012-06-28 at 11:20 -0700, Andi Kleen wrote:
> > > Not without a useful userspace part. 
> > 
> > http://permalink.gmane.org/gmane.linux.kernel/1319962
> > 
> > > Preferably not a script.
> > 
> > You don't need to prefer it.
> 
> +# will be very time consuming (about 10+ minutes for 10000 samples) if the
> 
> Muhahaha... I'll wait for something useful.

Yeah, that number scared me too when I first saw it, as the time will make
the script totally useless. Then after migrating to the RAM based database
file, the database handling time could be cut down to 1 second.

I guess the sqlite itself realize the shortcoming too, it also provide a
native way to use in-memory database by specifying ":memory":
	con = sqlite3.connect(":memory:")

Thanks,
Feng
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