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

[Peter Zijlstra]

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.

No.

> > 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.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/