linux-kernel - Re: [PATCH v3 00/12] perf, persistent: Add persistent events

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Message-ID: <20130827122721.GF15884@rric.localhost>
Date:	Tue, 27 Aug 2013 14:27:21 +0200
From:	Robert Richter <rric@...nel.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 00/12] perf, persistent: Add persistent events

On 24.08.13 11:38:26, Borislav Petkov wrote:
> this text is very nicely written and should be in a README somewhere.
> :-)

Yeah, will put it under tools/perf/Documentation/...

> > There are ioctl functions to control persistent events that can be
> > used to detach or attach an event to or from a process. The
> > PERF_EVENT_IOC_DETACH ioctl call makes an event persistent.
> 
> Yeah, we probably want to abstract this a step further by allowing
> to attach/detach fds to/from events. Then "persistent" is only one
> incarnation of us always detaching from the event during its lifetime.
> 
> If we close an event while it is attached, it gets destroyed - i.e.,
> current functionality, etc. See the other thread.

I don't know what you mean here exactly, please explain.

> But we probably need more input on this from people. Ingo, Peter?

Yes, that would be great.

Thanks,

-Robert
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