From: Matt Fleming <matt@console-pimps.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>, Jiri Olsa <jolsa@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Andi Kleen <andi@firstfloor.org>,
Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Kanaka Juvva <kanaka.d.juvva@intel.com>,
Matt Fleming <matt.fleming@intel.com>
Subject: Re: [PATCH v4 10/11] perf/x86/intel: Perform rotation on Intel CQM RMIDs
Date: Fri, 9 Jan 2015 12:14:01 +0000 [thread overview]
Message-ID: <20150109121401.GB495@console-pimps.org> (raw)
In-Reply-To: <20150106171712.GH3337@twins.programming.kicks-ass.net>
On Tue, 06 Jan, at 06:17:12PM, Peter Zijlstra wrote:
>
> afaict the again label will try and steal yet another rmid, if rmids
> don't decay fast enough, we could end up with all rmids on the limbo
> list and none active. Or am I missing something here?
You're not missing anything, that's true, we will try and steal more
RMIDs. We could perhaps put a limit on how many RMIDs we're willing to
steal, but I think it should definitely be > 1 because RMIDs can
stabilize out of order.
It's worth pointing out that we only steal more RMIDs if the ones on the
limbo list have been queued for the "minimum queue time" - it really is
a last resort.
--
Matt Fleming, Intel Open Source Technology Center
next prev parent reply other threads:[~2015-01-09 12:14 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-14 21:15 [PATCH v4 00/11] perf: Intel Cache QoS Monitoring support Matt Fleming
2014-11-14 21:15 ` [PATCH 01/11] perf tools: Parse event per-package info files Matt Fleming
2014-11-14 21:15 ` [PATCH 02/11] perf tools: Implement snapshot event file logic Matt Fleming
2014-11-14 21:15 ` [PATCH 03/11] perf: Make perf_cgroup_from_task() global Matt Fleming
2014-11-14 21:15 ` [PATCH 04/11] perf: Add ->count() function to read per-package counters Matt Fleming
2014-11-14 21:15 ` [PATCH 05/11] perf: Move cgroup init before PMU ->event_init() Matt Fleming
2014-11-14 21:15 ` [PATCH 06/11] x86: Add support for Intel Cache QoS Monitoring (CQM) detection Matt Fleming
2014-11-14 21:15 ` [PATCH 07/11] perf/x86/intel: Add Intel Cache QoS Monitoring support Matt Fleming
2014-11-14 21:15 ` [PATCH 08/11] perf/x86/intel: Implement LRU monitoring ID allocation for CQM Matt Fleming
2014-11-14 21:15 ` [PATCH v4 09/11] perf/x86/intel: Support task events with Intel CQM Matt Fleming
2014-11-14 21:15 ` [PATCH v4 10/11] perf/x86/intel: Perform rotation on Intel CQM RMIDs Matt Fleming
2015-01-06 16:13 ` Peter Zijlstra
2015-01-06 17:17 ` Peter Zijlstra
2015-01-09 12:14 ` Matt Fleming [this message]
2015-01-09 13:02 ` Peter Zijlstra
2015-01-09 15:24 ` Matt Fleming
2015-01-09 15:58 ` Peter Zijlstra
2015-01-15 15:31 ` Matt Fleming
2015-01-15 19:37 ` Matt Fleming
2015-01-06 17:36 ` Peter Zijlstra
2015-01-09 12:22 ` Matt Fleming
2015-01-09 12:59 ` Peter Zijlstra
2015-01-07 12:16 ` Peter Zijlstra
2015-01-09 12:55 ` Matt Fleming
2015-01-09 12:58 ` Peter Zijlstra
2015-01-11 10:45 ` Matt Fleming
2014-11-14 21:15 ` [PATCH 11/11] perf/x86/intel: Enable conflicting event scheduling for CQM Matt Fleming
2015-01-08 11:49 ` Peter Zijlstra
2015-01-09 12:56 ` Matt Fleming
2015-01-08 11:51 ` Peter Zijlstra
2015-01-09 14:27 ` Matt Fleming
2014-11-25 14:55 ` [PATCH v4 00/11] perf: Intel Cache QoS Monitoring support Matt Fleming
2014-12-18 7:59 ` Matt Fleming
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