Re: [RFC][PATCH 00/11] perf pmu interface -v2

Peter Zijlstra
2010-06-30T18:11:40Z

On Wed, 2010-06-30 at 10:19 -0700, Corey Ashford wrote:
> However, there still are concerns relative to writing these control
> registers from an interrupt handler because of the latency that will be
> incurred, however slow we choose to do the event rotation. So at least
> for the Wire-Speed processor, we may need a worker thread of some sort
> to hand off the work to.

Right, once we have per-pmu contexts we can look at having means to
over-ride the means of rotation, such that the pmu can optionally drive
it itself instead of through the common tick.