Re: [PATCH 1/3] arm/pmu: Reject groups spanning multiple hardware PMUs

Peter Zijlstra
2015-03-10T11:27:56Z

On Mon, Mar 09, 2015 at 12:46:30PM +0000, Suzuki K. Poulose wrote:
> From: "Suzuki K. Poulose" <suzuki.poulose@arm.com>
>
> Don't allow grouping hardware events from different PMUs
> (eg. CCI + CPU).

Uhm, how does this work? If we have multiple hardware PMUs we'll stop
scheduling events after the first failed event schedule. This can leave
one of the PMUs severely under utilized.