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From: Matt Fleming <matt@codeblueprint.co.uk>
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: Thu, 15 Jan 2015 15:31:27 +0000	[thread overview]
Message-ID: <20150115153127.GB3479@codeblueprint.co.uk> (raw)
In-Reply-To: <20150109155835.GJ29390@twins.programming.kicks-ass.net>

On Fri, 09 Jan, at 04:58:35PM, Peter Zijlstra wrote:
> On Fri, Jan 09, 2015 at 03:24:42PM +0000, Matt Fleming wrote:
> > 
> > Right, but now we need a "steal limit", so we know when to stop stealing
> > active RMIDs.
> > 
> > 	(cqm_max_rmid + 1) / 4 ?
> > 
> > I guess any limit is better than no limit.
> 
> Yeah, that'll work, when the free+limbo count is 1/4th the total we
> should stop pulling more plugs.

We actually stop pulling plugs as soon as there's a single RMID
available to use as the rotation RMID. When we find one, we don't wait
any longer to do any kind of batching (though if we go from zero
available RMIDs, to 5 RMIDs in one loop, we'll pickup all 5 RMIDs).

-- 
Matt Fleming, Intel Open Source Technology Center

  reply	other threads:[~2015-01-15 15:31 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
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 [this message]
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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