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 08/11] perf/x86/intel: Add Intel Cache QoS Monitoring support
Date: Wed, 8 Oct 2014 16:47:04 +0200 [thread overview]
Message-ID: <20141008144704.GJ10832@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <20141008121535.GT14343@console-pimps.org>
On Wed, Oct 08, 2014 at 01:15:35PM +0100, Matt Fleming wrote:
> I was having an interesting discussion with one of the teams using this
> stuff at Intel and they made the suggestion that when using,
>
> perf stat -p <pid>
>
> we should by default opt for sharing an RMID between all tasks in that
> thread group, rather that assigning a new RMID for each task, which is
> what we do currently.
>
> Right now, it's like the Oprah Winfrey of RMID assignment, "You get an
> RMID, and you get an RMID!"
>
> Which means we'll run out of RMIDs quicker, and enable the rotation code
> sooner.
>
> I'm wondering whether we should require that the user specify whether
> they want per-thread monitoring if using -p, via some perf tools event
> modifier, and make the record-per-thread-data scenario the exceptional
> case, rather than the default?
Right so perf cannot do this. And I'm not sure that's fixable, it
depends a bit on how the cqm thing deals with inherited events, IFF it
can reuse RMIDs for inherited events we might be able to extend the
syscall to install 'inherited' events throughout the process group,
instead of just the one thread.
next prev parent reply other threads:[~2014-10-08 14:47 UTC|newest]
Thread overview: 46+ 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 [this message]
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
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
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