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Message-ID: <20141008095109.GD4750@worktop.programming.kicks-ass.net>
Date: Wed, 8 Oct 2014 11:51:09 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Matt Fleming <matt@...sole-pimps.org>
Cc: Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>,
linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
Matt Fleming <matt.fleming@...el.com>,
Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH 09/11] perf/x86/intel: Implement LRU monitoring ID
allocation for CQM
On Wed, Sep 24, 2014 at 03:04:13PM +0100, Matt Fleming wrote:
> From: Matt Fleming <matt.fleming@...el.com>
>
> 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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