Messages in this thread | | | Date | Wed, 16 Mar 2011 14:53:15 +0100 | From | Frederic Weisbecker <> | Subject | Re: [RFC PATCH 0/4] perf: Custom contexts |
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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.
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