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Message-ID: <20100110220440.GA4595@brick.ozlabs.ibm.com> Date: Mon, 11 Jan 2010 09:04:40 +1100 From: Paul Mackerras <paulus@...ba.org> To: Frederic Weisbecker <fweisbec@...il.com> Cc: Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>, Peter Zijlstra <peterz@...radead.org>, Arnaldo Carvalho de Melo <acme@...hat.com> Subject: Re: [PATCH 6/6] perf: Increase round-robin fairness of flexible events Frederic, Nice to see someone working on the event scheduling in perf. But I don't think this patch makes sense: > Group of flexible events are round-robined in each tick so that > each group has its chance to be scheduled. But the fairness > per group granularity doesn't propagate inside the groups > themselves. > > If only the first events of each groups have a chance to make > their way, the remaining ones will never be scheduled. > > Hence this patch propagates the round-robin to the events > inside the groups. The semantic of a group is that either all of the events in the group are scheduled in, or none of them are. So it doesn't make sense to talk about fairness within a group, and I don't see any point to rotating the elements of the sibling_list. Or have I misunderstood what you're aiming at? Paul. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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