Re: [PATCH 10/11] perf/x86/intel: Support task events with Intel CQM
From: Peter Zijlstra
Date: Wed Oct 08 2014 - 10:50:11 EST
On Wed, Oct 08, 2014 at 01:10:44PM +0100, Matt Fleming wrote:
> Ah, interesting.
> I dropped the internal scheduling because I preferred the idea of
> "failing fast", in the sense that if we can't schedule multiple events
> simultaneously because they conflict, we should report that to the user
> at event init time, rather than trying to manage the conflict ourselves,
> with the resultant loss of accuracy.
The thing is, with multiplexing you cannot fail at event creation time
anyhow. The only time where you can 'fail' is when programming the PMU,
when its full its full.
Those that don't fit, get to wait their turn.
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