From: Peter Zijlstra <peterz@infradead.org>
To: Matt Fleming <matt@console-pimps.org>
Cc: Ingo Molnar <mingo@kernel.org>, Jiri Olsa <jolsa@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Matt Fleming <matt.fleming@intel.com>,
Arnaldo Carvalho de Melo <acme@redhat.com>
Subject: Re: [PATCH 09/11] perf/x86/intel: Implement LRU monitoring ID allocation for CQM
Date: Wed, 8 Oct 2014 11:51:09 +0200 [thread overview]
Message-ID: <20141008095109.GD4750@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <1411567455-31264-10-git-send-email-matt@console-pimps.org>
On Wed, Sep 24, 2014 at 03:04:13PM +0100, Matt Fleming wrote:
> From: Matt Fleming <matt.fleming@intel.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?
next prev parent reply other threads:[~2014-10-08 9:51 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-24 14:04 [PATCH 00/11] perf: Intel Cache QoS Monitoring support Matt Fleming
2014-09-24 14:04 ` [PATCH 01/11] perf stat: Fix AGGR_CORE segfault on multi-socket system Matt Fleming
2014-09-24 14:04 ` [PATCH 02/11] perf tools: Refactor unit and scale function parameters Matt Fleming
2014-09-29 9:21 ` Jiri Olsa
2014-10-03 5:25 ` [tip:perf/core] " tip-bot for Matt Fleming
2014-09-24 14:04 ` [PATCH 03/11] perf tools: Parse event per-package info files Matt Fleming
2014-09-24 14:04 ` [PATCH 04/11] perf: Make perf_cgroup_from_task() global Matt Fleming
2014-10-07 18:51 ` Peter Zijlstra
2014-10-08 10:27 ` Matt Fleming
2014-09-24 14:04 ` [PATCH 05/11] perf: Add ->count() function to read per-package counters Matt Fleming
2014-09-24 14:04 ` [PATCH 06/11] perf: Move cgroup init before PMU ->event_init() Matt Fleming
2014-10-07 19:34 ` Peter Zijlstra
2014-10-08 10:32 ` Matt Fleming
2014-10-08 10:49 ` Peter Zijlstra
2014-09-24 14:04 ` [PATCH 07/11] x86: Add support for Intel Cache QoS Monitoring (CQM) detection Matt Fleming
2014-09-24 14:04 ` [PATCH 08/11] perf/x86/intel: Add Intel Cache QoS Monitoring support Matt Fleming
2014-09-24 16:40 ` Andi Kleen
2014-09-24 20:27 ` Matt Fleming
2014-09-24 20:39 ` Andi Kleen
2014-09-29 18:51 ` Matt Fleming
2014-10-07 19:43 ` Peter Zijlstra
2014-10-08 10:36 ` Matt Fleming
2014-10-08 12:15 ` Matt Fleming
2014-10-08 14:47 ` Peter Zijlstra
2014-10-08 20:51 ` Peter Zijlstra
2014-09-24 14:04 ` [PATCH 09/11] perf/x86/intel: Implement LRU monitoring ID allocation for CQM Matt Fleming
2014-10-08 9:51 ` Peter Zijlstra [this message]
2014-10-08 10:53 ` Matt Fleming
2014-09-24 14:04 ` [PATCH 10/11] perf/x86/intel: Support task events with Intel CQM Matt Fleming
2014-09-24 14:45 ` Matt Fleming
2014-10-08 10:01 ` Peter Zijlstra
2014-10-08 11:07 ` Peter Zijlstra
2014-10-08 12:10 ` Matt Fleming
2014-10-08 14:49 ` Peter Zijlstra
2014-10-10 12:02 ` Matt Fleming
2014-10-10 14:02 ` Peter Zijlstra
2014-10-10 10:54 ` Peter Zijlstra
2014-10-10 11:10 ` Matt Fleming
2014-09-24 14:04 ` [PATCH 11/11] perf/x86/intel: Perform rotation on Intel CQM RMIDs Matt Fleming
2014-10-08 11:19 ` Peter Zijlstra
2014-10-08 11:56 ` Matt Fleming
2014-10-08 18:08 ` Peter Zijlstra
2014-10-08 19:02 ` Thomas Gleixner
2014-10-08 19:59 ` Matt Fleming
2014-10-08 18:10 ` Peter Zijlstra
2014-10-08 20:04 ` Matt Fleming
-- strict thread matches above, loose matches on Subject: below --
2014-10-01 14:36 [PATCH v2 00/11] perf: Intel Cache QoS Monitoring support Matt Fleming
2014-10-01 14:36 ` [PATCH 09/11] perf/x86/intel: Implement LRU monitoring ID allocation for CQM Matt Fleming
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