Re: [RFC PATCH 0/4] perf: Custom contexts

From: Peter Zijlstra
Date: Wed Mar 16 2011 - 09:56:58 EST

On Wed, 2011-03-16 at 14:53 +0100, Frederic Weisbecker wrote:
> On Tue, Mar 15, 2011 at 11:32:54PM +0100, Peter Zijlstra wrote:
> > Right, so I don't much like the interface, two new ioctl()s and a flag
> > of dubious use.
> Do you think we need a new syscall for this new feature.


> > How important is this recursive nature of the thing to you:
> >
> > > It's supposed to support infinite combinations with starter having starters
> > > themselves, plus filters, etc...
> >
> > We've so far avoided recursion like that, we only have single level
> > groups etc.
> There is actually no recursivity of any sort that the kernel has to handle.
> The starter/stopper links are never handled recursively. ie: there is no
> loop walking through the entire chain of starter to starter to starter, etc...
> It's always only handled between direct related event: starter and target, but
> never further.
> Only the final effect has recursion properties in the resulting count
> or trace.

That's not an answer to my question.
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