Re: [PATCH 09/11] perf/x86/intel: Implement LRU monitoring ID allocation for CQM

[Peter Zijlstra]

On Wed, Sep 24, 2014 at 03:04:13PM +0100, Matt Fleming wrote:
> From: Matt Fleming <matt.fleming@xxxxxxxxx>
> 
> It's possible to run into issues with re-using unused monitoring IDs
> because there may be stale cachelines associated with that ID from a
> previous allocation. This can cause the LLC occupancy values to be
> inaccurate.
> 
> To attempt to mitigate this problem we place the IDs on a least recently
> used list, essentially a FIFO. The basic idea is that the longer the
> time period between ID re-use the lower the probability that stale
> cachelines exist in the cache.

Do we want to provide a user configurable minumum guaranteed queue time?
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