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Date: Wed, 25 Nov 2009 09:00:03 +1100 From: Paul Mackerras <paulus@...ba.org> To: eranian@...il.com Cc: Peter Zijlstra <peterz@...radead.org>, linux-kernel@...r.kernel.org, mingo@...e.hu, perfmon2-devel@...ts.sf.net, eranian@...gle.com Subject: Re: [PATCH] perf_events: fix validate_event bug stephane eranian writes: > That means we can drop is_software_event() in this code and instead > define locally > in x86 a is_hw_pmu_event() function as event->pmu == &pmu. I'd have to see the patch, but that doesn't feel entirely right, because there is a unique characteristic of software events, compared to hardware or breakpoint events: they are never capacity constrained. In the past, only hardware events were capacity constrained, which meant that all the decisions about whether a group could go on could be done in the hardware PMU backend. Now we have two sources of capacity constraints, so it may be that a group can't go on even if the hardware PMU has capacity. That's going to be somewhat interesting to get completely right, I think. 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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