linux-kernel - Re: [PATCH 0/4] perf tools: Persistent events, changes for perf tool integration

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Date:	Fri, 31 May 2013 14:48:05 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Robert Richter <rric@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <peterz@...radead.org>,
	Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
	Robert Richter <robert.richter@...xeda.com>
Subject: Re: [PATCH 0/4] perf tools: Persistent events, changes for perf tool
 integration


* Borislav Petkov <bp@...en8.de> wrote:

> On Fri, May 31, 2013 at 02:07:20PM +0200, Ingo Molnar wrote:
> > For that I'd like to create a persistent event that just keeps
> > running, and to which I can occasionally attach to read-only to see
> > what's going on and maybe attach to it read-write to drain the trace
> > entries. I.e. basically a global trace buffer. How do I achieve that
> > with this new tooling?
> 
> I have a patch which adds persistent_events= kernel command line param 
> and uses the same syntax as trace_event=. Rostedt has seen it already, I 
> need to incorporate his comments and send it out next week.

A kernel command line does not make it very practical - this needs to be 
accessible from tooling ...

Thanks,

	Ingo
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